Several people misunderstood what I said around 5:38 The statement in the video is correct. Gravity is not energy. The question people ask is "aren't we using gravity to spin turbines at dams (hydroelectric plants etc)... isn't that gravity making energy?" The answer is NO. It takes the water cycle created by solar energy to make hydroelectricity work. Or you can pump the water uphill which is often called a gravity battery. A battery must be charged. The battery is not energy. In both cases gravity is used to storge the energy which is what I said in the video. This is why I gave the spring example immediately after. You can use a spring to store energy, but the spring is not energy. The important thing is you can't get free energy this way because you have to put energy in first. Again that is what I said in the video. It might also help to watch again. If you still don't understand you can ask below.
Hey mate! I love your content 💖 I just completed a mechanical engineering diploma, and want to start electrical! - if there's any insights you have for beginners - that would be super helpful 🙂 Thanks for all your videos 🙏
@@Jeremy_Fielding If people misunderstand what you said, then you have failed. Too much irrelevant information. I wanted to know how regenerative braking works, but I gave up.
@johnawalker9261 LOL I agree. I failed on some parts! This is why I stopped to write an explaination of the one area people seemed to be having trouble. I could have easily fixed it with one more line about dams in the video. Now I know. Though no one has mentioned anything else. I would love to know what details seemed irrelevant to you. I spend days thinking about nearly every line. All these thoughts are meant to narrow a wide field down to one path cutting off all the tangents people take getting lost with free energy ideas. If I knew the parts where you didn't understand the connection, that would help me teach better. My goal is to teach. I try something, I see if the student gets it, than I try again. You make failing sound way too negative! Maybe you just wanted to insult me, but I love the word LOL. I fail at many things I set out to do. But I try again. I built a robot by trying a lot of stuff that didn't work. Then I did something I thought was way too hard but tried anyway. You can do the same. Rather than give up, check out videos by others. Maybe they explain it better. Thanks for commenting though. It really helps the video. Maybe you just meant to be rude, but this comment could be really helpful if you answered the question. Thanks again.
@Jeremy_Fielding Yeah, he just meant to be rude. It's a great video. Just because he apparently wanted a simple answer, which he could've looked up in 5 seconds, some of us appreciate a more thorough explanation. If you worry about the trolls, you'll burn yourself out. It's easier to feel like a big deal by destroying things than by building them. The comment was just virtual vandalism.
@@chrisgeary4624 I think Jeremy might be on a mission to debug the internet of free energy misinformation Turns out, that might be self - perpetuating code...
Another excellent video Jeremy, and congrats on passing 1M subs! 👏👏👏 At 6:03 I think every engineer (inc me) remembers their eureka moment when they thought they could out smart the power companies and build some simple device that used gravity and magnets to build a perpetual motion machine instead of spending billions on a a complex nuclear reactor.
I can still remember the day I realized gears trade speed for torque. They don't just multiple the speed, or multiple the torque. Something is being traded. It was a revelation.
These days, aspiring engineers are less inclined to making these decisions because the physics and engineering community is jam packed with anti-perpetual motion content.
I'm a retired Marine Engineer from the UK, and I find your video's fascinating, and am so happy to see your channel progressing so well over the last few years. You are a great inspiration to kids, explaining stuff in such a simple to understand way. Hopefully you have, and will continue to entice young minds into the wonderful world of mechanical and electrical engineering. Well Done Sir, I applaud you.
Your passion for what you’re saying comes out in the presentation and makes it more fun to watch. Don’t ever lose that. I’ve had a smile on my face watching.
Yeah that was interesting. What really blows my mind is that gravity is not a force! Think about it... Drop a feather and a cannon ball in a vacuum ( so no wind resistance ) and they both fall at the same speed!
I am sort of confused by this. I thought that gravity was the force exerted by a more massive object in a less massive object. Isn't that why planets orbit the sun? I'm not seeing the storage piece there. I get how thinking of it as storage works in the context of everyday Earth, but still seems like a force to me.
The demonstration of the magnetic through the non-magnetic tube is truly astounding, even though it makes perfect sense. We deeply appreciate your ability to convey the sense of wonder that this elicits!
One thing I learned early on in my industrial maintenance career was how to check a permanent magnet DC motor to see if it was still good. First, you basically disconnect the power wires from the power source and make sure the shaft rotates relatively freely. (If it's a gear motor, you have to take into account the resistance of the gearbox) Then, you tie the two power wires on the motor together and try to turn the motor. If it is a good motor, the shaft won't turn without considerable torque being applied. It'll basically feel like the shaft is locked. If the motor still spins freely, more often than not, your brushes are totally shot out. It could also be that your armature is nasty as hell, or your rotor has some serious winding failure going on. Usually, it's the brushes are shot. If the motor still turns but is "grabby" in places and the bushes look good, then that's most likely a dirty armature.
@@X_mano You can do it with any permanent magnet DC motor - even the little ones like those in computer fans those cheap battery powered Chineseum "personal fans", etc. You've probably got a ton of those laying around somewhere unless unlike me, you throw stuff away as soon as you get through using it. I, on the other hand, gotta keep it laying around somewhere until I get a notion to take it apart and salvage some parts from it.
I have been an industrial electrician for 20+ years. I have worked extensively with regen/dynamic braking. Mainly seen it used on the bigger cranes, and on large motors powered by VFDs. Instead of charging batteries, we dump the load through large resistors, producing heat. They are usually the component to fail
I remember a story from my coworker. They were working on some problem on the crane and they let it run for a while. Then some guy starts shouting: hey! That crane is glowing! My friend answered: but the cranes don't glow... Then he looked in a dark crane alley and saw a nice orange glow at the bottom of a crane mast. Resistors got so hot, they started to glow and melted plastic boxes around the crane 😁
@milaim Not quite. Contagious implies "spread via contact" (physically impossible over youtube). Infectious implies "spread through infectious agents" (in this case TH-cam). By the way, I had to look it up. I don't pretend to know everything. English isn't even my first language, so I am always happy to learn something new.
FYI: passenger electric rail cars use this dynamic braking, but use the heat energy to heat the passenger cab in the winter. The PATCO high speed line uses this (just in case this is not common). The dynamic braking is used from 60mph down to 5mph and only then the mechanical brakes engage. The mechanical brakes are far to jarring for the passengers otherwise.
I love everything about this video. Your expanations along the way, your manufacturing skills, and your excitment is absolutely contagious. I've been in electrical engineering for over 2 decades now and watching this video has me as excited as my first day in the lab! Absolutely mint content. Thanks!
Great Video as always. I get 20% plus back in regen braking in my 2014 Leaf. There was an app that showed owners all manner of data, including total energy used, energy from regen etc. The app no longer works, but there is still useful data in the car itself, such as Kilometers per Kilowatt Hour and real time energy usage or energy gain from braking. I can get a peak of 30KWH under braking and more sustained recovery of between 5-10 KWH at most stops or coasting downhill. I can drive in the city and barely touch the friction brakes, by leaving space to the vehicles in front of me, anticipating lights and traffic, and being less aggressive overall. At most stops, the regen slows me to around 10KPH. I am about to change the front brake pads for the first time and the rears were changed just last spring.
I started working at Nissan Technical Center North America in 1996 through 2022 as a Durability Test Driver. When the Nissan Leaf was in the testing faze years before it was released into production, I was testing the Durability of them. As the technology changed and new batteries came out, milage improved. Our testing was designed to get over 12 miles of the average real-world customers driving for each mile we drove. Numerous stop and go and coasting miles, and high-speed 100 mph with several coasts to 90 mph and floorboarding to 100 mph tests. We drove these tests with 3 charges per shift, using diesel generators and fast charging stations, two 9-hour shifts per day. We also had off-track test driving routes that drained the battery pack to limp mode before we recharged.
Hi Jeremy - I'm an electrical engineer and wanted to say that I think you did a great job explaining regenerative breaking. I was especially impressed with your explanation of Lenz's Law, especially given that you are trying to explain a concept that involves invisible forces. I've also enjoyed many of your other videos. You are a gifted educator and I hope you continue making great videos. - Best regards - Jim
As a electrical engineer, I sense the short circuit true the screen🤣. I love your style of showing the science material! Thank you for the years of entertaining!
I upgraded the motor controller of my electric moped/scooter to one that supports regenerative braking(Kelly controller). I have also noticed that the faster you go, the harder the max generative breaking effect there is, and as you come to a stop, you may want to apply the normal brakes just a bit to fully stop the vehicle. A pro of regenerative braking that not many have talked about is the smoothness. The normal brakes on my electric scooter are very inconsistent, but this other system is very consistent. I think you should've added that pretty much all EVs use BLDC motors (3-phase), and not DC motors. I would be very interested in you explaining how they are able to use that braking on those motors, when you have exceed the voltage of the battery, and they still use the very same MOSFETs to do that as they use for spinning the motor. But great video!
To my understanding, independent of the motor type regenerative braking is simply done by requesting a torque that opposes the speed (i. e. a braking torque). If you "simply" tell the controller to do that, as long as the torque remains opposed to the speed the motor will act as a generator without special care needed
Wow! As a mechanical engineer (68 years y/o) - I’m so glad I found your channel - loved the way you explained all of this - particularly liked the demo of dropping the magnet through the tubes - so informative!
One clarity I think you should make is that it's usable energy that changed. You always get exactly the same energy out as what put in. The losses we see are thermal losses. For example when the magnet is dropped down the tube there is also a very slight but present heating in the tube and magnet.
In other videos I dig into heat losses a little more, but here I was running into a very long video. :) It can be hard to explain it all when this segment is not really what the video is about. I wanted to explain regenerative braking and briefly address the free energy ideas very closely related to this as I know it will generate hundreds of emails from people with ideas that we can use this for free energy... and why aren't we already doing that!
@@Jeremy_Fielding I generally agree with the OP in that showing losses would be a step-up, but I would take it a step further and suggest that you consider including energy-flow diagrams. IMO, they can be super simple, and they can help illustrate and drive home the core fundamentals, e.g., the law of conservation of energy > Ein = Eout -- with the rigs you're building, you could even "prove" the laws... That said, as someone who's tried his hand at TH-cam, I totally get your point and won't be broken-hearted if I never see such a diagram or mention in your videos. Absolutely love your energy and content!
I seldom have a use for any of the things you build, BUT I love absorbing the knowledge 🙂. I am (secretly ?) amazed that you can keep coming up with new lessons/projects. Thank you.
I gave a regular diesel car and I mostly break using my engine. I've already had a complete failure of my drum breaks back because I don't break enough. It's an Dacia Duster, thinking about converting it to breaking disc instead if possible. The short made me impressed with how "instant" that was! Thank you for very informattive and great videos!
Like you said, this is the basics behind all Metro services. I'm a Train Operator (Loco Pilot in railway terms) in Metro Service in INDIA. We use Brake Blending method which mixes dynamic and pneumatics braking. The difference with this video is, instead of DC motor, here 3 phase Induction motor is used having capacity of 275KW with 750V DC supply (Behind the scene: DC converted back to AC using Inverter logics and feeding to Motor 0- 350V 3Phase Supply). From my observation so far, the maximum voltage generated while braking is 940V ( It should be more than this value, unfortunately we have restrictions for applying brakes. When we enter platforms, we use medium braking by following the advisory provided by the on board Car Born Controller in order to avoid jerks and delays (Lower speed will adds delay. We never use Full braking. So, chance for getting max voltage generation is very low). Now, why Brake blending used? As you explained, we cant stop any moving thing which have huge weight using regenerative braking. Because, as the speed reduces, Voltage generated in the windings also reduced. Which lower the opposing force. So in trains, the regenerative braking is ineffective when the speed is less than 7-8 KMPH. So what in trains do is, we have a controlling unit called TRAIN CONTROL AND MONITORING SYSTEM, in short TCMS, which controls everything. So when the position of TBC** is in braking zone, TCMS proportionally apply the regenerative braking by varying the frequency of the supply given to the motor. **TBC lever = Traction brake control handle. it have 3 positions. UP side - Traction/ Acceleration, Middle - Coasting, Lower- braking. Suppose, Motor Magnetic Field speed (Ns) = 1000 rpm Motor rotor speed Nr = 950 rpm ( rotor always try to follow Ns, but it won't reach Ns, the difference between Ns and Nr in terms of Ns is called Slip (s). S is the relative speed difference between stator and rotor. Ns> Nr means Motoring Ns Nr. You may think in this way, I told you Ns changed to 600 at starting. So braking may stops at 600 rpm if we didn't move TBC further down. But an important thing to notice is, Even if we didnt move the TBC position, the Ns will automatically reduced up to a certain speed (7-8 kmp) from which the regenerative action is ineffective. This is done by TCMS. When the ineffectiveness of this regenerative braking due to lower speed detected by the TCMS, it will start engaging the physical brake, ie, pneumatic braking in which the air pressure of brake cylinder increased/ decreased so that a brake pad will either pushed towards moving wheel or a disk for frictional braking. Hence train stops.
Some data centers actually use large spinning masses to store backup energy. The mass is connected to a diesel generator so that when utility power is lost they can near instantly cut over to the generator which is already being powered by the spinning mass which will hold the load until the diesel engine can crank up and hold the load. It works just like a battery UPS, but without a bunch of batteries.
Wow - great video! It's an accessible, yet thorough explanation of regenerative braking. I recently got a hybrid vehicle and this explains so much! FWIW, 1:31 to 1:49, this is how guitar pickups work! Magnetic string vibrating near a coil of wire, generates a signal, which is then amplified by an... erm.... amplifier. It's wild that the same principle has so many applications.
Just found your channel and this is so great in so many ways, I can not begin to thank you for such a clear explanation. As a retired chemical engineer, I have never had the electrical world in my head.
It’s been 4 weeks, hopefully you see this but you’re busy. I worked on contract for ACDelco and drove the EV1 and Hydrogen fuel cell van. Plus, in addition to 4hr tech seminars in 7 states I had 5 warehouses to look at returned parts. It kills me to see a new disc brake rotor sent back with a small amount of rust. What happens if perfectly clean and you wash the car? Or it tans while at work while outside the garage. Moisture in the air condenses when temps change. It creates rust on the bare metal. Normally, a little rust is gone before they back out the driveway past the mailbox. I may growl and make a noise, but it’s gone fast. Plus 3 types of pads, organic, metallic and ceramic compounds. I enjoy the learning. DK, Omaha. Thank you kindly for sharing. ASE Master Tech, 1978.
You are just fantastic explaining “stuff” . Your enthusiasm radiates and motivates your effectiveness as a teacher. I just wish you the best of what life offers you. . Thank you 💕
Bumped into this video by chance (AKA: TH-cam thought I’d be interested. I do drive an EV). I’m so happy I did. It’s informative, well presented, and very enthusiastic. I’ve just subscribed and will be watching regularly with my daughter.
I had 2 EVs, so I am good with the regenerative braking. Back in the 1970s I got a degree in electronic, but I worked in IT and management for the last 30 years. I do not recall having many classes on 3-phase AC motors. I understand 3-phase motors, but I am completely clueless on how you introduce the desired frequency and the "braking torque", and capture the output energy? I am looking forward for the next videos on how EV regenerative braking works. I love your passion, I love your way of explaining. Great works!!!
Not sure if already mentioned - Note that hybrid cars get better mpg in city driving versus highway. This due to 2 things ; 1. Lower energy lost to aerodynamic drag due to lower speeds and 2. regen braking capturing (and then re-using) most of the energy instead of just heating up the brakes. Great video, love all your stuff, you convey your obvious enthusiasm so well.
I have a 2016 Kia Soul EV, with a "93 mile range." During the summer, if I never drive over 40 mph, the car might report that, but realistically I get around 70 miles. This car has a "B" mode on the stalk, which is extra regenerative braking mode. I use this exclusively. The manual says I get around 12% back maximum, which tracks with the 10-20% you heard. I haven't done extensive testing because I just don't like driving in normal braking mode now. It's even at the point where I drive similarly in my (gas) work truck, rather than immediately applying the brake to slow down, I just let off the accelerator, until I need the brake. I took my EV to a Les Schwab not too long ago and they said my brake pads were like new, but my rotors had small rust spots, probably because I don't use them enough to get them hot.
Jeremy, love your videos ! * Regenerative Braking range extension has many variables, aside from Basic Design specs. "Driving Conditions" immediately comes to mind. Stop & Go city driving, vs Freeway. In addition "vehicle mass" ( curb weight fully loaded ) has a huge effect. I find this all fascinating. My primary vehicle is electric, as ALL my driving is local, in town. I have my Regen Braking turned off ( programming ) because where I live I mostly try to stay on backroads with fewer stops. My electric vehicle I have highly modified myself, doubling both speed and range. I have a further modification I am adding by Winter, that should increase my range even further, at the same top speed. Love you videos ! 😊😊😊😊
Another amazing video and you’ve answered a query I’d always had about why electric cars don’t generate electricity as they drive. It’s always fun to watch someone talk enthusiastically about what they love. Thanks again. Chris.
We call it regerative breaking in the Elevator Industry! Elevators traditionally burned the energy off as heat, but now elevator systems can push that energy back in the building! I love your videos Jeremy and have referenced them many many times in my training classes!
Thank you for doing the experiment. Having the argument with people showed me that, just having equations and basic understanding of thermodynamics isn't enough to convince people. Some people just need to see it in action. Although some people will still think they know something everyone else don't.
One of the most powerful phrases I was ever taught for dealing with people, especially online is “You can’t reason people out of a position they didn’t reason themselves into”. There are many, many topics that people have strong beliefs in that are NOT based on reason, so trying to use reason to change their minds will almost never work. They didn’t use reason to get there in the first place, they’re not going to allow reason to bring them back out.
It took me a very long time to realize some people just enjoy hoping it is true way more than they care about any facts or proof. I love teaching this stuff and many people really just don't understand it at first. I have way more emails and comments telling me "thank you for explaining that I get it now" compared to the hardcore "free energy is covered up by the government" people. But once I know that is who I am talking to, I just politely say "lets agree to disagree. We don't have to believe or think the same thing." However, I understand why this feels like it should work if you have very little experience with this stuff and don't work in a related field. Magnets feel like magic and so do gears actually. Until that is you understand what is being traded to get the results you want.
@@Jeremy_Fielding it seems that many people have a considerable and fundamental misunderstanding of how generators/motors work and react when connected to a load: they don’t simply “free-wheel”. They spin an old car alternator and think it’s just “that easy” all the time! This video does a great job of demonstrating the fact that no, it doesn’t work that way. By the way, when you pull an old synchronous turntable motor out of a microwave oven (c’mon, I know we all do it), don’t spin the shaft manually while holding the motor in the palm of your hand. Considerable shock ensues and you will drop that motor faster than anything you’ve ever dropped in your life!
Your estimate on what you recoup in range is pretty much spot on. i rarely use my brakes in my Model Y. The times I use them is when I need to hard brake or if I mis-calculate my distance from my stop or an object in front of me. Otherwise I use the regen feature. Gravity, at least in an EV, is the best friend of regen braking from my novice use of regen braking. So if I'm driving and I coming down hill or mountain driving and I coming down elevation and I set my car in it's autopilot setting I can see that I'm regen braking. I remember coming back from a trip the car estimated I would arrive at my destination with a certain percentage but I did better than the estimate by gaining about 7kwh extra due to regen braking. Now while I'm not an electrical engineer...far from it...I get excited over this because I'm a network engineer. I love the electrical side and the technological side of it all. I want to piggy back on the rusting of the brakes. In my case that isn't an issue because there are times, as I have explained above, where you will use your conventional brakes. But since my car as Autopilot as well as the FSD (Full Self Driving) feature, it actually applies the conventional breaks when using those feature. So break rust really isn't an issue but overall you still use those conventional brakes a great deal less.
Great video! As for applications, there are mining and logging operations out west that use either an electric train to bring coal down the mountain full to charge batteries to drive back up empty and also logging trucks that go down full of logs but can go back up empty. he only charge comes from braking against gravity. It saves so much money on fuel and on replacing brakes!
another grrrrreat video (as usual) from which I learned sooooo much (as usual), and presented by a host is both knowledgeable and enthusiastic and personable. I sure am glad your channel showed up in my feed. Thank you for all the work and then sharing.
Mad respect, it takes people like him, with a passion on things most individuals don't understand or don't want to understand, to improve the world and our lives.
Hey i have a genuine question. And i hope you read this because it's a bit long , regarding my 2 EV cars that I own here in india. My questions are the following 1. How do the cars create levels of regen? 2. Does torque make any difference to the regen capability? Or rather what kind of car would have better regen in comparison to another? 3. Does temperature of the motor/wire/battery affect the regen? I've noticed my kona EV having different regen behaviour(weaker regen) when the car starts vs when it's been running for a just a short while. 4. Also, if you know why different car brands have different types of regen. Eg : i test drove the byd seal , and it's got regen that's extremely weak vs my kona EV. And the regen is as weak on my tiny Tiago ev. My First car is the hyundai kona EV 39kwh which has a 100kw motor in it. Thanks to the information available inbthe infotainment system, I can see that my max regen is -100kwh when I set the regen level to max level 3. My 2nd car is from a local brand named tata Tiago EV, which has a 24kwh battery and a 55kw motor. (No information about the regen energy produced by the car).
I love the way you have added value to the education you had. Yes, you were taught the basics involved in these things, you then have further developed your understanding of that. So... you can teach in a way we idiots can understand. (Only idiots until we are also taught how it works) You earned my sub. People like you are why education should be free, for the benefit of all.
I cant wait until my kids are old enough to understand these concepts so i can share your videos with them and do some ove the demonstrations you present. Love your channel Jeremy. Excellent work!
Spot on, as a locomotive engineer, on a DC locomotive when going from power to dynamic braking, during the transition, we have to wait about 10 seconds for current to dissipate before applying dynamic braking so as not to damage the motor.
Really good video overall Jeremy. I really enjoy your videos as they are very informative and this set up to explain how regen braking works is a very good example, though crude, way of how it works. Some times making the example super simple to explain a complex mechanism is the best way. There is 1 thing to touch on, though. Even though the motor is a DC powered motor, once it is turned into a generator, it is outputting AC power, not DC as you mentioned at 16:45. The light bulbs are still being powered by AC current. If you had rectifier then the bulbs would be running on DC. I'm sure you are very aware of this and it was just a slip up as I know most of your videos aren't scripted and you were caught up in the moment of excitement and explanations
Right. We call that solar power not gravity power. Solar energy is what creates this cycle not gravity. You have to lift the water. That’s what I said in the video.
What a fantastic presentation 😊 So much fun to watch and to learn. Even if it's learning little things like the automatic scraping system of the breaks. My compliments 👌🍾
I just came across your channel. Fantastic explanations and demonstrations of physics at work (pun intended). I love how excited you get with describing and showing us this. Fabulous!
Very informative thanks. I had been wondering how variable regen worked, wondering if there was maybe some kind of clutch or gearing involved. Hadn't realised that tapping more energy off of the generator increased it's (mechanical) resistance.
Hi Jeremy, very interesting topic. I own an F150 Lightning and I kind of did a similar experiment on my last camping trip. I live in Colorado and my elevation at home is just under 5000 Ft. And my elevation and my camp site is just over 10,000 ft. With a full charge at 320 miles of range, I had about 174 miles remaining upon arrival at my camp site. And then the temperature that night in the middle of July dropped to 27F and I used my truck heating to help keep warm all night and that left me with about 153 miles of range remaining. My trip back home will be 79 miles. Same as it was going up. And upon arrival at my house, I had 155 miles of range remaining. So the 5000 foot drop in elevation basically paid for my trip back home. So regenerative braking is more efficient than you think. ;0)
So glad to see the correct spelling of "braking" in the title. A pet peeve of mine. But "connected together"? Can they be "connected apart"? An excellent video!
This is a interesting thought... "connected together." I bet if you thought about there are probably many examples of this in common use. When I started learning Chinese I noticed this a lot. Very common phrases in Chinese seem to have words with redundant meaning. But seeing you point this common English reference out makes me think this probably happens a lot in my own language.
About 20 years ago I worked for a major IT company. We opened a new data centre. In case of a power outage instead of banks of batteries to provide power until the generators can start up they had 6 generators connected to giant flywheels to do the job.
I own a Toyota Yaris hybrid. It regenerates during braking, and it improves the range most when driving in the city, where you typically accelerate and brake many times. On a highway it doesn't help as much.
Hey Jeremy, were you science oriented in your education? Engineering? Math? Physics? I'm so inspired by your understanding of these concepts and your ability to build so much. Thanks
this was an AWESOME video! I have a Prius and that uses regenerative braking to charge it's battery. And it has made it possible for my brakes to last over 100k miles too! So just to be clear.. when the device you made is in neutral that means there is no load on the generator.. but when a load is applied, either the bulbs or a battery in a car, that's when that reverse magnetic field is generated that pushes backwards and slows the vehicle, correct? It's all an incredible use of physics and I'm happy there is someone else that gets as psyched over physics and mechanical/electrical engineering as I do!
It is Bart Simpson riding his bicycle at night. He needs to use the headlamp, so he engages the generator. He now has light but he can barely pedal anymore. If he were coasting downhill the headlamp would shine and the bicycle would slow waaaay down.
Several people misunderstood what I said around 5:38 The statement in the video is correct. Gravity is not energy. The question people ask is "aren't we using gravity to spin turbines at dams (hydroelectric plants etc)... isn't that gravity making energy?" The answer is NO. It takes the water cycle created by solar energy to make hydroelectricity work. Or you can pump the water uphill which is often called a gravity battery. A battery must be charged. The battery is not energy. In both cases gravity is used to storge the energy which is what I said in the video. This is why I gave the spring example immediately after. You can use a spring to store energy, but the spring is not energy. The important thing is you can't get free energy this way because you have to put energy in first. Again that is what I said in the video. It might also help to watch again. If you still don't understand you can ask below.
Hey mate! I love your content 💖 I just completed a mechanical engineering diploma, and want to start electrical! - if there's any insights you have for beginners - that would be super helpful 🙂 Thanks for all your videos 🙏
@@Jeremy_Fielding If people misunderstand what you said, then you have failed. Too much irrelevant information. I wanted to know how regenerative braking works, but I gave up.
@johnawalker9261 LOL I agree. I failed on some parts! This is why I stopped to write an explaination of the one area people seemed to be having trouble. I could have easily fixed it with one more line about dams in the video. Now I know. Though no one has mentioned anything else. I would love to know what details seemed irrelevant to you. I spend days thinking about nearly every line. All these thoughts are meant to narrow a wide field down to one path cutting off all the tangents people take getting lost with free energy ideas. If I knew the parts where you didn't understand the connection, that would help me teach better. My goal is to teach. I try something, I see if the student gets it, than I try again. You make failing sound way too negative! Maybe you just wanted to insult me, but I love the word LOL. I fail at many things I set out to do. But I try again. I built a robot by trying a lot of stuff that didn't work. Then I did something I thought was way too hard but tried anyway. You can do the same. Rather than give up, check out videos by others. Maybe they explain it better. Thanks for commenting though. It really helps the video. Maybe you just meant to be rude, but this comment could be really helpful if you answered the question. Thanks again.
@Jeremy_Fielding Yeah, he just meant to be rude. It's a great video. Just because he apparently wanted a simple answer, which he could've looked up in 5 seconds, some of us appreciate a more thorough explanation.
If you worry about the trolls, you'll burn yourself out. It's easier to feel like a big deal by destroying things than by building them. The comment was just virtual vandalism.
@@chrisgeary4624 I think Jeremy might be on a mission to debug the internet of free energy misinformation
Turns out, that might be self - perpetuating code...
As an engineer myself, the way you get excited about physics makes me happy.
Non-engineer who on and off follow my curiosity into the subjects his enthusiasm is so amazing!
Physicist, engineer, fabrication and design genius in one guy. Jeremy is an amazing guy and a superb teacher. Bravo!
Another excellent video Jeremy, and congrats on passing 1M subs! 👏👏👏
At 6:03 I think every engineer (inc me) remembers their eureka moment when they thought they could out smart the power companies and build some simple device that used gravity and magnets to build a perpetual motion machine instead of spending billions on a a complex nuclear reactor.
I can still remember the day I realized gears trade speed for torque. They don't just multiple the speed, or multiple the torque. Something is being traded. It was a revelation.
These days, aspiring engineers are less inclined to making these decisions because the physics and engineering community is jam packed with anti-perpetual motion content.
Hydro dams generate electricity from gravity
Yesh i remember that." Im a genius! " Oops it didn't work 😂
@@MrYerak5the energy for that is still from the sun technically.
I'm a retired Marine Engineer from the UK, and I find your video's fascinating, and am so happy to see your channel progressing so well over the last few years. You are a great inspiration to kids, explaining stuff in such a simple to understand way. Hopefully you have, and will continue to entice young minds into the wonderful world of mechanical and electrical engineering. Well Done Sir, I applaud you.
Man loves energy so much that can’t get the smile off his face throughout the entire video.
Infinite energy machine confirmed.
Saw the thumbnail. Wanted to say that. 😂
Jeremy is the channel other TH-camrs watch.
Oh crap. Famous people watching famous people!
Not surprised to see you here
I guess your next not-a-wheelchair will have those Infinite energy machine 🤔
Your passion for what you’re saying comes out in the presentation and makes it more fun to watch. Don’t ever lose that. I’ve had a smile on my face watching.
Wow love the explanation of how gravity itself is not energy, but a medium of storing it. That really helps make stuff like this more intuitive!
Yeah that was interesting. What really blows my mind is that gravity is not a force! Think about it... Drop a feather and a cannon ball in a vacuum ( so no wind resistance ) and they both fall at the same speed!
Gravity is a spring. Confirmed.
.... Potential energy? We learned this in highschool
@@Deasy782 same here probably, that was a hell of a long time ago though..
I am sort of confused by this. I thought that gravity was the force exerted by a more massive object in a less massive object. Isn't that why planets orbit the sun? I'm not seeing the storage piece there. I get how thinking of it as storage works in the context of everyday Earth, but still seems like a force to me.
The demonstration of the magnetic through the non-magnetic tube is truly astounding, even though it makes perfect sense. We deeply appreciate your ability to convey the sense of wonder that this elicits!
One thing I learned early on in my industrial maintenance career was how to check a permanent magnet DC motor to see if it was still good.
First, you basically disconnect the power wires from the power source and make sure the shaft rotates relatively freely.
(If it's a gear motor, you have to take into account the resistance of the gearbox)
Then, you tie the two power wires on the motor together and try to turn the motor. If it is a good motor, the shaft won't turn without considerable torque being applied. It'll basically feel like the shaft is locked.
If the motor still spins freely, more often than not, your brushes are totally shot out. It could also be that your armature is nasty as hell, or your rotor has some serious winding failure going on. Usually, it's the brushes are shot.
If the motor still turns but is "grabby" in places and the bushes look good, then that's most likely a dirty armature.
Cool hack you got there, wish i had a dc motor lying around to experience it myself.
@@X_mano You can do it with any permanent magnet DC motor - even the little ones like those in computer fans those cheap battery powered Chineseum "personal fans", etc. You've probably got a ton of those laying around somewhere unless unlike me, you throw stuff away as soon as you get through using it. I, on the other hand, gotta keep it laying around somewhere until I get a notion to take it apart and salvage some parts from it.
@@jdgower1why does tying the leads together cause the shaft to be harder to rotate?
@@A_Stereotypical_Hereticthats explained in this video 😅
@@A_Stereotypical_Heretic thats explained in this video 😅
I have been an industrial electrician for 20+ years. I have worked extensively with regen/dynamic braking. Mainly seen it used on the bigger cranes, and on large motors powered by VFDs. Instead of charging batteries, we dump the load through large resistors, producing heat. They are usually the component to fail
I remember a story from my coworker. They were working on some problem on the crane and they let it run for a while. Then some guy starts shouting: hey! That crane is glowing! My friend answered: but the cranes don't glow... Then he looked in a dark crane alley and saw a nice orange glow at the bottom of a crane mast. Resistors got so hot, they started to glow and melted plastic boxes around the crane 😁
Great video, as always. Clearly explained, and your excitement is infectious. You're truly one of the greatest educational channels for engineering.
*Contagious
@milaim Not quite. Contagious implies "spread via contact" (physically impossible over youtube). Infectious implies "spread through infectious agents" (in this case TH-cam).
By the way, I had to look it up. I don't pretend to know everything. English isn't even my first language, so I am always happy to learn something new.
FYI: passenger electric rail cars use this dynamic braking, but use the heat energy to heat the passenger cab in the winter. The PATCO high speed line uses this (just in case this is not common). The dynamic braking is used from 60mph down to 5mph and only then the mechanical brakes engage. The mechanical brakes are far to jarring for the passengers otherwise.
I love everything about this video. Your expanations along the way, your manufacturing skills, and your excitment is absolutely contagious. I've been in electrical engineering for over 2 decades now and watching this video has me as excited as my first day in the lab! Absolutely mint content. Thanks!
Great video. As a Tesla owner this is the first explanation of regen brakes that makes sense. Love your excitement
My man doesnt set up a stand to hold the tube over the gopro. No, he effortlessly holds the tube exactly where it needs to be
Great Video as always.
I get 20% plus back in regen braking in my 2014 Leaf.
There was an app that showed owners all manner of data, including total energy used, energy from regen etc. The app no longer works, but there is still useful data in the car itself, such as Kilometers per Kilowatt Hour and real time energy usage or energy gain from braking. I can get a peak of 30KWH under braking and more sustained recovery of between 5-10 KWH at most stops or coasting downhill.
I can drive in the city and barely touch the friction brakes, by leaving space to the vehicles in front of me, anticipating lights and traffic, and being less aggressive overall.
At most stops, the regen slows me to around 10KPH.
I am about to change the front brake pads for the first time and the rears were changed just last spring.
I started working at Nissan Technical Center North America in 1996 through 2022 as a Durability Test Driver. When the Nissan Leaf was in the testing faze years before it was released into production, I was testing the Durability of them. As the technology changed and new batteries came out, milage improved. Our testing was designed to get over 12 miles of the average real-world customers driving for each mile we drove. Numerous stop and go and coasting miles, and high-speed 100 mph with several coasts to 90 mph and floorboarding to 100 mph tests. We drove these tests with 3 charges per shift, using diesel generators and fast charging stations, two 9-hour shifts per day. We also had off-track test driving routes that drained the battery pack to limp mode before we recharged.
Hi Jeremy - I'm an electrical engineer and wanted to say that I think you did a great job explaining regenerative breaking. I was especially impressed with your explanation of Lenz's Law, especially given that you are trying to explain a concept that involves invisible forces. I've also enjoyed many of your other videos. You are a gifted educator and I hope you continue making great videos. - Best regards - Jim
Congratulations on your 1 million subscribers! I am a big fan. We need more videos like this.
As a electrical engineer, I sense the short circuit true the screen🤣. I love your style of showing the science material! Thank you for the years of entertaining!
I upgraded the motor controller of my electric moped/scooter to one that supports regenerative braking(Kelly controller). I have also noticed that the faster you go, the harder the max generative breaking effect there is, and as you come to a stop, you may want to apply the normal brakes just a bit to fully stop the vehicle.
A pro of regenerative braking that not many have talked about is the smoothness. The normal brakes on my electric scooter are very inconsistent, but this other system is very consistent.
I think you should've added that pretty much all EVs use BLDC motors (3-phase), and not DC motors.
I would be very interested in you explaining how they are able to use that braking on those motors, when you have exceed the voltage of the battery, and they still use the very same MOSFETs to do that as they use for spinning the motor.
But great video!
To my understanding, independent of the motor type regenerative braking is simply done by requesting a torque that opposes the speed (i. e. a braking torque). If you "simply" tell the controller to do that, as long as the torque remains opposed to the speed the motor will act as a generator without special care needed
one of the top explainers on YT imho!
Wow! As a mechanical engineer (68 years y/o) - I’m so glad I found your channel - loved the way you explained all of this - particularly liked the demo of dropping the magnet through the tubes - so informative!
Have you ever thought about teaching? You have such an endearing character, I wish i had a teacher like you in my apprenticeship,brilliant
One clarity I think you should make is that it's usable energy that changed. You always get exactly the same energy out as what put in. The losses we see are thermal losses. For example when the magnet is dropped down the tube there is also a very slight but present heating in the tube and magnet.
In other videos I dig into heat losses a little more, but here I was running into a very long video. :) It can be hard to explain it all when this segment is not really what the video is about. I wanted to explain regenerative braking and briefly address the free energy ideas very closely related to this as I know it will generate hundreds of emails from people with ideas that we can use this for free energy... and why aren't we already doing that!
@@Jeremy_Fielding I generally agree with the OP in that showing losses would be a step-up, but I would take it a step further and suggest that you consider including energy-flow diagrams. IMO, they can be super simple, and they can help illustrate and drive home the core fundamentals, e.g., the law of conservation of energy > Ein = Eout -- with the rigs you're building, you could even "prove" the laws...
That said, as someone who's tried his hand at TH-cam, I totally get your point and won't be broken-hearted if I never see such a diagram or mention in your videos.
Absolutely love your energy and content!
I seldom have a use for any of the things you build, BUT I love absorbing the knowledge 🙂. I am (secretly ?) amazed that you can keep coming up with new lessons/projects. Thank you.
I gave a regular diesel car and I mostly break using my engine. I've already had a complete failure of my drum breaks back because I don't break enough. It's an Dacia Duster, thinking about converting it to breaking disc instead if possible.
The short made me impressed with how "instant" that was! Thank you for very informattive and great videos!
Like you said, this is the basics behind all Metro services. I'm a Train Operator (Loco Pilot in railway terms) in Metro Service in INDIA. We use Brake Blending method which mixes dynamic and pneumatics braking. The difference with this video is, instead of DC motor, here 3 phase Induction motor is used having capacity of 275KW with 750V DC supply (Behind the scene: DC converted back to AC using Inverter logics and feeding to Motor 0- 350V 3Phase Supply). From my observation so far, the maximum voltage generated while braking is 940V ( It should be more than this value, unfortunately we have restrictions for applying brakes. When we enter platforms, we use medium braking by following the advisory provided by the on board Car Born Controller in order to avoid jerks and delays (Lower speed will adds delay. We never use Full braking. So, chance for getting max voltage generation is very low).
Now, why Brake blending used?
As you explained, we cant stop any moving thing which have huge weight using regenerative braking. Because, as the speed reduces, Voltage generated in the windings also reduced. Which lower the opposing force. So in trains, the regenerative braking is ineffective when the speed is less than 7-8 KMPH. So what in trains do is, we have a controlling unit called TRAIN CONTROL AND MONITORING SYSTEM, in short TCMS, which controls everything. So when the position of TBC** is in braking zone, TCMS proportionally apply the regenerative braking by varying the frequency of the supply given to the motor.
**TBC lever = Traction brake control handle. it have 3 positions. UP side - Traction/ Acceleration, Middle - Coasting, Lower- braking.
Suppose,
Motor Magnetic Field speed (Ns) = 1000 rpm
Motor rotor speed Nr = 950 rpm ( rotor always try to follow Ns, but it won't reach Ns, the difference between Ns and Nr in terms of Ns is called Slip (s). S is the relative speed difference between stator and rotor.
Ns> Nr means Motoring
Ns Nr.
You may think in this way, I told you Ns changed to 600 at starting. So braking may stops at 600 rpm if we didn't move TBC further down. But an important thing to notice is, Even if we didnt move the TBC position, the Ns will automatically reduced up to a certain speed (7-8 kmp) from which the regenerative action is ineffective. This is done by TCMS.
When the ineffectiveness of this regenerative braking due to lower speed detected by the TCMS, it will start engaging the physical brake, ie, pneumatic braking in which the air pressure of brake cylinder increased/ decreased so that a brake pad will either pushed towards moving wheel or a disk for frictional braking. Hence train stops.
I have been questioning why we can't recharge while driving forever!!! Great work!
No idea why this was suggested to me, but very nice video with an easy to understand explanation and demonstration.
I try to watch all of your you tube video’s. I have you saved in my playlists. You are the best in explaining how electricity work’s.
Some data centers actually use large spinning masses to store backup energy. The mass is connected to a diesel generator so that when utility power is lost they can near instantly cut over to the generator which is already being powered by the spinning mass which will hold the load until the diesel engine can crank up and hold the load. It works just like a battery UPS, but without a bunch of batteries.
Wow - great video! It's an accessible, yet thorough explanation of regenerative braking. I recently got a hybrid vehicle and this explains so much!
FWIW, 1:31 to 1:49, this is how guitar pickups work! Magnetic string vibrating near a coil of wire, generates a signal, which is then amplified by an... erm.... amplifier. It's wild that the same principle has so many applications.
This is my kind of content. You have an amazing ability to explain complicated concepts in an understandable way.
Just found your channel and this is so great in so many ways, I can not begin to thank you for such a clear explanation. As a retired chemical engineer, I have never had the electrical world in my head.
Your excitement and smile when you see the system working as expected is contagious! You’re an amazing teacher!
I'm a long time viewer and have seen your shop improvements over the years.
Congrats on your cnc. Keep em coming!!
It’s been 4 weeks, hopefully you see this but you’re busy. I worked on contract for ACDelco and drove the EV1 and Hydrogen fuel cell van. Plus, in addition to 4hr tech seminars in 7 states I had 5 warehouses to look at returned parts. It kills me to see a new disc brake rotor sent back with a small amount of rust. What happens if perfectly clean and you wash the car? Or it tans while at work while outside the garage. Moisture in the air condenses when temps change. It creates rust on the bare metal. Normally, a little rust is gone before they back out the driveway past the mailbox. I may growl and make a noise, but it’s gone fast. Plus 3 types of pads, organic, metallic and ceramic compounds. I enjoy the learning. DK, Omaha. Thank you kindly for sharing.
ASE Master Tech, 1978.
You are absolutely right. Locomotive Diesel Electric Engines are using this breaking system for many decades.
Excellent video!
Respect!! A CNC machine funded by your own genius way of making machines!
what a lovely, gentle, inspiring educator!
You are just fantastic explaining “stuff” . Your enthusiasm radiates and motivates your effectiveness as a teacher. I just wish you the best of what life offers you. . Thank you 💕
Bumped into this video by chance (AKA: TH-cam thought I’d be interested. I do drive an EV). I’m so happy I did. It’s informative, well presented, and very enthusiastic. I’ve just subscribed and will be watching regularly with my daughter.
I had 2 EVs, so I am good with the regenerative braking. Back in the 1970s I got a degree in electronic, but I worked in IT and management for the last 30 years. I do not recall having many classes on 3-phase AC motors. I understand 3-phase motors, but I am completely clueless on how you introduce the desired frequency and the "braking torque", and capture the output energy? I am looking forward for the next videos on how EV regenerative braking works. I love your passion, I love your way of explaining. Great works!!!
Not sure if already mentioned - Note that hybrid cars get better mpg in city driving versus highway. This due to 2 things ; 1. Lower energy lost to aerodynamic drag due to lower speeds and 2. regen braking capturing (and then re-using) most of the energy instead of just heating up the brakes. Great video, love all your stuff, you convey your obvious enthusiasm so well.
I have a 2016 Kia Soul EV, with a "93 mile range." During the summer, if I never drive over 40 mph, the car might report that, but realistically I get around 70 miles. This car has a "B" mode on the stalk, which is extra regenerative braking mode. I use this exclusively. The manual says I get around 12% back maximum, which tracks with the 10-20% you heard. I haven't done extensive testing because I just don't like driving in normal braking mode now. It's even at the point where I drive similarly in my (gas) work truck, rather than immediately applying the brake to slow down, I just let off the accelerator, until I need the brake. I took my EV to a Les Schwab not too long ago and they said my brake pads were like new, but my rotors had small rust spots, probably because I don't use them enough to get them hot.
the most informative and satisfying video I have ever seen about regen braking, thank you ❤
Watched your talk last night at Math for America. These videos have been great for my automotive engineering students. Thank you!
Jeremy, love your videos !
* Regenerative Braking range extension has many variables, aside from Basic Design specs. "Driving Conditions" immediately comes to mind. Stop & Go city driving, vs Freeway. In addition "vehicle mass" ( curb weight fully loaded ) has a huge effect. I find this all fascinating. My primary vehicle is electric, as ALL my driving is local, in town. I have my Regen Braking turned off ( programming ) because where I live I mostly try to stay on backroads with fewer stops.
My electric vehicle I have highly modified myself, doubling both speed and range. I have a further modification I am adding by Winter, that should increase my range even further, at the same top speed.
Love you videos ! 😊😊😊😊
You picked a perfect explainer video. Im sure most people wonder how that works. I knew the basics of it all but I knew it was way deeper than that.
Another amazing video and you’ve answered a query I’d always had about why electric cars don’t generate electricity as they drive.
It’s always fun to watch someone talk enthusiastically about what they love. Thanks again. Chris.
We call it regerative breaking in the Elevator Industry! Elevators traditionally burned the energy off as heat, but now elevator systems can push that energy back in the building! I love your videos Jeremy and have referenced them many many times in my training classes!
Great demo and discussion. I am running a bicycle with regen-braking, yes, extends the life of the braking system on the bicycle.
Thank you for doing the experiment. Having the argument with people showed me that, just having equations and basic understanding of thermodynamics isn't enough to convince people. Some people just need to see it in action. Although some people will still think they know something everyone else don't.
One of the most powerful phrases I was ever taught for dealing with people, especially online is “You can’t reason people out of a position they didn’t reason themselves into”. There are many, many topics that people have strong beliefs in that are NOT based on reason, so trying to use reason to change their minds will almost never work. They didn’t use reason to get there in the first place, they’re not going to allow reason to bring them back out.
It took me a very long time to realize some people just enjoy hoping it is true way more than they care about any facts or proof. I love teaching this stuff and many people really just don't understand it at first. I have way more emails and comments telling me "thank you for explaining that I get it now" compared to the hardcore "free energy is covered up by the government" people. But once I know that is who I am talking to, I just politely say "lets agree to disagree. We don't have to believe or think the same thing." However, I understand why this feels like it should work if you have very little experience with this stuff and don't work in a related field. Magnets feel like magic and so do gears actually. Until that is you understand what is being traded to get the results you want.
@@Jeremy_Fielding it seems that many people have a considerable and fundamental misunderstanding of how generators/motors work and react when connected to a load: they don’t simply “free-wheel”. They spin an old car alternator and think it’s just “that easy” all the time! This video does a great job of demonstrating the fact that no, it doesn’t work that way.
By the way, when you pull an old synchronous turntable motor out of a microwave oven (c’mon, I know we all do it), don’t spin the shaft manually while holding the motor in the palm of your hand. Considerable shock ensues and you will drop that motor faster than anything you’ve ever dropped in your life!
Your estimate on what you recoup in range is pretty much spot on. i rarely use my brakes in my Model Y. The times I use them is when I need to hard brake or if I mis-calculate my distance from my stop or an object in front of me. Otherwise I use the regen feature. Gravity, at least in an EV, is the best friend of regen braking from my novice use of regen braking. So if I'm driving and I coming down hill or mountain driving and I coming down elevation and I set my car in it's autopilot setting I can see that I'm regen braking. I remember coming back from a trip the car estimated I would arrive at my destination with a certain percentage but I did better than the estimate by gaining about 7kwh extra due to regen braking. Now while I'm not an electrical engineer...far from it...I get excited over this because I'm a network engineer. I love the electrical side and the technological side of it all.
I want to piggy back on the rusting of the brakes. In my case that isn't an issue because there are times, as I have explained above, where you will use your conventional brakes. But since my car as Autopilot as well as the FSD (Full Self Driving) feature, it actually applies the conventional breaks when using those feature. So break rust really isn't an issue but overall you still use those conventional brakes a great deal less.
Great video! As for applications, there are mining and logging operations out west that use either an electric train to bring coal down the mountain full to charge batteries to drive back up empty and also logging trucks that go down full of logs but can go back up empty. he only charge comes from braking against gravity. It saves so much money on fuel and on replacing brakes!
another grrrrreat video (as usual) from which I learned sooooo much (as usual), and presented by a host is both knowledgeable and enthusiastic and personable. I sure am glad your channel showed up in my feed. Thank you for all the work and then sharing.
Simple experiment shown from 4.10 to 5.20 is amazing. Basic concept of complicated breaking is well explained
Mad respect, it takes people like him, with a passion on things most individuals don't understand or don't want to understand, to improve the world and our lives.
Hey i have a genuine question. And i hope you read this because it's a bit long , regarding my 2 EV cars that I own here in india.
My questions are the following
1. How do the cars create levels of regen?
2. Does torque make any difference to the regen capability? Or rather what kind of car would have better regen in comparison to another?
3. Does temperature of the motor/wire/battery affect the regen?
I've noticed my kona EV having different regen behaviour(weaker regen) when the car starts vs when it's been running for a just a short while.
4. Also, if you know why different car brands have different types of regen. Eg : i test drove the byd seal , and it's got regen that's extremely weak vs my kona EV. And the regen is as weak on my tiny Tiago ev.
My First car is the hyundai kona EV 39kwh which has a 100kw motor in it. Thanks to the information available inbthe infotainment system, I can see that my max regen is -100kwh when I set the regen level to max level 3.
My 2nd car is from a local brand named tata Tiago EV, which has a 24kwh battery and a 55kw motor. (No information about the regen energy produced by the car).
Your happiness is contagious, I hope you continue to make and discover more fascinating things.
Glad to see you over 1M subscribers! Congratulations
Thank you for this video. I own a Tesla and this definitely explains regenerative braking in an easy fashion. Side note I love one petal driving
Thanks for paying knowledge and development of intuitivity forward.
Really appreciate it.
I love the way you have added value to the education you had. Yes, you were taught the basics involved in these things, you then have further developed your understanding of that. So... you can teach in a way we idiots can understand. (Only idiots until we are also taught how it works) You earned my sub. People like you are why education should be free, for the benefit of all.
Man, that "short circuit braking" is excellent 😂
I cant wait until my kids are old enough to understand these concepts so i can share your videos with them and do some ove the demonstrations you present. Love your channel Jeremy. Excellent work!
Spot on, as a locomotive engineer, on a DC locomotive when going from power to dynamic braking, during the transition, we have to wait about 10 seconds for current to dissipate before applying dynamic braking so as not to damage the motor.
I love your videos. Your enthusiasm and delivery are phenomenal. Jayman.
Really good video overall Jeremy. I really enjoy your videos as they are very informative and this set up to explain how regen braking works is a very good example, though crude, way of how it works. Some times making the example super simple to explain a complex mechanism is the best way.
There is 1 thing to touch on, though. Even though the motor is a DC powered motor, once it is turned into a generator, it is outputting AC power, not DC as you mentioned at 16:45. The light bulbs are still being powered by AC current. If you had rectifier then the bulbs would be running on DC. I'm sure you are very aware of this and it was just a slip up as I know most of your videos aren't scripted and you were caught up in the moment of excitement and explanations
Man, you explain this so well. Very nice to watch your video. Keep up the good works!
This is awesome! Love your videos with your enthusiasm, explanations and demonstrations! Feel like you’re a hidden gem. Keep up the good work!😀
Hydropower is energy from gravity, but it depends on the water already having potential energy, i.e. uphill from the turbine/generator.
That is solar power
Right. We call that solar power not gravity power. Solar energy is what creates this cycle not gravity. You have to lift the water. That’s what I said in the video.
What a fantastic presentation 😊 So much fun to watch and to learn. Even if it's learning little things like the automatic scraping system of the breaks. My compliments 👌🍾
wow! well done! Bravo! i never knew how regenerative braking worked - thanks for explaining it!
Wonderful job, young man! Your explanations are Clear and easy to comprehend.
I just came across your channel. Fantastic explanations and demonstrations of physics at work (pun intended). I love how excited you get with describing and showing us this. Fabulous!
I really enjoy watching someone who obviously loves their topic 👏
Thank you Jeremy. This was an excellent demonstration which I found very helpful! Clearly explained, very informative.
What a great video, clear explanation. The way you present is just so positive. Thank you
Man you’re a genius I aspire to be as intelligent as you bro 🙏🏾 thanks for the content
Very informative thanks. I had been wondering how variable regen worked, wondering if there was maybe some kind of clutch or gearing involved. Hadn't realised that tapping more energy off of the generator increased it's (mechanical) resistance.
The tubes and magnets was so cool. Thanks for the Great Explanations.
Hi Jeremy, very interesting topic. I own an F150 Lightning and I kind of did a similar experiment on my last camping trip. I live in Colorado and my elevation at home is just under 5000 Ft. And my elevation and my camp site is just over 10,000 ft. With a full charge at 320 miles of range, I had about 174 miles remaining upon arrival at my camp site. And then the temperature that night in the middle of July dropped to 27F and I used my truck heating to help keep warm all night and that left me with about 153 miles of range remaining. My trip back home will be 79 miles. Same as it was going up. And upon arrival at my house, I had 155 miles of range remaining. So the 5000 foot drop in elevation basically paid for my trip back home. So regenerative braking is more efficient than you think. ;0)
So glad to see the correct spelling of "braking" in the title. A pet peeve of mine. But "connected together"? Can they be "connected apart"?
An excellent video!
This is a interesting thought... "connected together." I bet if you thought about there are probably many examples of this in common use. When I started learning Chinese I noticed this a lot. Very common phrases in Chinese seem to have words with redundant meaning. But seeing you point this common English reference out makes me think this probably happens a lot in my own language.
About 20 years ago I worked for a major IT company. We opened a new data centre. In case of a power outage instead of banks of batteries to provide power until the generators can start up they had 6 generators connected to giant flywheels to do the job.
I admire your enthusiasm in engineering. I'm impressed
regen braking has been used for decades in buses ive been on in the late 60s very effective on steep mountain roads
something about his explanations are easier to grasp for me, thanks for this video, it's inspiring.
Great illustrations!! Love your positive vibe !! Congratulations on 1 million + subscribers!!!
I own a Toyota Yaris hybrid. It regenerates during braking, and it improves the range most when driving in the city, where you typically accelerate and brake many times. On a highway it doesn't help as much.
You are such an amazing person to share all of your knowledge and you are so good at it
Hey Jeremy, were you science oriented in your education? Engineering? Math? Physics? I'm so inspired by your understanding of these concepts and your ability to build so much. Thanks
I have a Ford Cmax hybrid with regenerative braking. The car has 180k miles on it and, so far, I've never needed to have the brake pads replaced.
Thank you for your passion. It’s infectious and a joyful way to learn.
this was an AWESOME video! I have a Prius and that uses regenerative braking to charge it's battery. And it has made it possible for my brakes to last over 100k miles too!
So just to be clear.. when the device you made is in neutral that means there is no load on the generator.. but when a load is applied, either the bulbs or a battery in a car, that's when that reverse magnetic field is generated that pushes backwards and slows the vehicle, correct?
It's all an incredible use of physics and I'm happy there is someone else that gets as psyched over physics and mechanical/electrical engineering as I do!
It is Bart Simpson riding his bicycle at night. He needs to use the headlamp, so he engages the generator. He now has light but he can barely pedal anymore. If he were coasting downhill the headlamp would shine and the bicycle would slow waaaay down.
I had one of those headlights on my bicycle when I was a kid. It made it a lot harder to pedal. Better to just be home before dark.
That was enlightening and I love your enthusiasm for the subject. You have a new subscriber
Awesome video, great way to explain regeneative breaking using Lenz law. I never understood this before. Great way to explain fundamental principles.