This video is good for elementary school kids. It's so simple that doesn't give any intuitive information. First, the toy you showed has commutators and it basically works the same way for generating mechanical power and regenerating of power. However, electric cars used inverters and selective battery charging. Also, you can use supercaps to save energy for a short burst of regenration. Supercaps increases the life of batteries and can be charge and discharge at the same rate. I don't know if Tesla uses supercaps though. Second, electric cars have bank of batteries and they charge and discharge them selectively with secret algorithms. Third, most of cost of these cars are their batteries. Fourth, with manipulating the battery Banks the e-cars can access to a lot of electric power for a short time specially if they have supercaps. That's why these car have such a high acceleration. Basically their acceleration is limited to their tires tractions which means they can go from 0 to 60 as same time as breaking from 60 to 0. Fifth, e-cars are mechanically very simple that translates to a fewer machanical problems and visits to the dealers.
Little correction, there is no such thing as back EMF when motor work as generator, then it is called only EMF (motional emf). Back EMF is specific only to motors working as motors. As the motor is turning, it also acts as a generator and generates a "back emf".
Yes. You are correct. Generator works on the principle that varying magnetic flux generates electricity in the conducting wires that cut the flux. His may be a slip of tongue.
but you didnt explain how an electric car is able to apply such a strong breaking force with just regen. most electric cars today can stop with just regen action, where is the power dumped if the batteries cannot take it all at once ? how is it handled, i feel that the title of this video didnt explain HOW regen BREAKING is done fully... maybe a follow up video ?
Mark Mark I think they just limit the regeneration and use disc brakes. EVs often have battery cooling problems so I wonder if one could use a high performance radiator/water pump that’s powered by excess energy under breaking. The Model 3 Performance can’t go flat out around the Nurburgring. Using battery power to run a pump might increase battery temp but using excess power might drop the temp.
"where is the power dumped if the batteries cannot take it all at once" short of the battery already being full while breaking down hill when would your scenario ever happen?
BushidoBrownSama I’ve looked a little bit into it. Modern electric car batteries can’t take in charge as fast as they dispel charge. In other words they can’t regenerate/brake as fast as they accelerate. When the regenerative braking meets the max charging rate they start using the disk brakes to slow down. They could use way more regenerative braking but there’s nowhere to put the energy.
@@grantlauzon5237 They use a certain type/class of super capacitors that can charge at high speeds and discharge at a manageable rate (regular super capacitors discharge all at once), then after the braking action is done it allows the electricity from the super capacitor bank into the battery at a manageable pace.
Also a problem is that batteries overheat if you apply too much the energy from braking so cars have sensors that use the breaks to prevent this problems. Maybe a car with some kind of super capacitor could handle it better.
backemf is the voltage induced in the coils due to the changing magnetic field, not the torque the backemf causes current to flow through the resistance across the motor terminals, and that negative current is what causes the negative torque. if the motor was not hooked up to anything (infinite load resistance) then no current would flow and no torque would be applied on the shaft even though backemf is still being induced in the coil
I would request a video explaining why helical differentials are said to have no wear, when they still need to rely on friction of components to limit the slip. What makes their friction different than the friction that happens in other limiting diffs, such as viscous?
You put a spring hooked up to a plunger and have it stick out of the front bumper about two feet. Then when you come to an intersection you just ram your car into the car ahead of you. This resets the plunger into your car which under spring load can now be used to push off the car behind you. Its efficient and a wonderful way to meet really angry people.
On a road car, what is it that starts the regeneration, is it initiated only on braking as opposed to coasting? Assuming it's on applying the brakes, is it possible to just touch the brakes light enough to engage the regeneration, but not hard enough to put much force into the brakes? I'm thinking about how to get the most recovery possible. Also, is there a measurement of how much braking force the regeneration provides in comparison to brakes? Lastly, are you aware of any systems that use some type of gearing to increase the braking force while regenerating? Seems this might be more possible with a flywheel, but I don't know enough about electric motors to understand if this would benefit or not. Thanks for all your work on these videos, I really enjoy your approach to explaining concepts like this.
Probably varies a bit depending on the manufacturer. My Toyota hybrid car uses regen at any time when I let the car slow down gently without a brake application, and sometimes when using cruise control on a variable gradient. It can maintain a steady speed downhill using this - until the traction battery is fully charged!
This is why you get more mileage in the city compared to highway driving. In the city, it's stop and go with the regen compared to highway driving. With gas vehicles, it's contrary.
A few Mazdas have regenerative braking to power the 12 volt system and cut down on the alternator's work. I'm kind of dubious that it really saves much fuel, though.
As a guy with pads and rotors, i hardly ever even use my brakes. Mostly time my coasting and then when i need to i lightly brake. My car gets the highway rating mpg even though i drive about 60%city and 40% highway. When i drove a car with regenerative braking i was not a fan. It was harder to drive smooth and i feel like you have to gas for longer because once you let off the gas the car will start braking instead of coasting... idk im just a fan of already efficient gasoline cars.
How exactly can you control the strength of braking? I assume it is done by decreasing the input power, but I want to know for sure. (If it was explained in this video I'd've missed it. If that's the case it would be nice if someone could give me the time stamp ^^ )
I know this response is 3 years late but if I understand your question correctly you simply decrease the amount of pressure your foot is applying to the accelerator. The car (for example a Tesla) recognizes that when you take your foot off the accelerator, you would like to slow down. You rarely have to use the brake pedal in a car with regen breaking which saves you from having to purchase brake pads/rotors. Hope you’re doing well!
We have a Mitsubishi Outlander PHEV. My husband and I disagree about how to use the regen to best effect. The default position is off, and we can use paddle controls to choose 5 different levels of regenerative braking (up to b5). Is it better to keep it on all the time, even on journeys that include motorways, or to use it to brake, then release it when accelerating again? I think that if it’s on all the time (eg on most used setting b3), each time you take your foot off the accelerator the car slows down more than it would normally, so more power is needed to return to normal speed. I tend to only use regen when needing to actually brake, then I release it. Which is better, please?
It is best to drive on lowes level 0, the glide mode. Only when you want a car to slow use regen paddles. When you drive in "regen" level your car is regenerating energy while you driving, but doing so it lose more energy than it produces, obviously. If you drive in level 0, there is no resistance and no energy los. Best to drive on level 0! To extende you range you mast plane you driving: 1. left your foot from the throttle and glid as long you are not slowing the trafic bihand, then 2. regen to slow, then 3 brake to stop.
Or C) You can feed it back to the power supply grid such as how electric trains do. Obviously this doesn't apply to battery-powered EVs but it's another place to send that energy.
Considering the fact that it only takes a few seconds to stop a car, the regen braking probably doesn't add a noticeable amount of MPGs. But considering the reduced brake wear, it probably wouldn't be surprising to see a set of brake pads last thru the life of a car. I go very light on the brakes of my Venza. So hopefully, I'll prove my theory.
Efficiency is only 60% do they use super caps to save the energy fast then transfer back to batteries lol i was going to mention twin motors for regeneration then right at the end you covered it thank you
If you assume that the battery is large enough to take all of the current, the regen strength depends on the size/power of the motor? Electric cars have different settings for how aggressive regen is. How does that work?
Great video as always Kyle. I know you've covered vortex generators in general, but can you make a video on canards and their various functions? Thanks!
Could you use a some form of high end radiator/water pump that only activates when excess power os generated? Electric vehicles often have battery over heating problems under sustained sport use. Using regular battery power to power a powerful water pump could increase the battery temperature. If the pump is only used when excess electricity is available it might improve the endurance of a vehicle on a track.
I've come across your videos two days ago and find them very informative en entertaining! You're concise yet clear which is good and actually very hard to do in a short lecture/video. Your current setup is of better quality (mainly sound) than your earlier videos from 2015, but I hope you can further improve on it with your presentation. E.g. have prepared graphics instead of the whiteboard lecture. I know it's a big investment in time/money to prepare graphics for videos, but I think your viewership would grow accordingly. Everybody loves nice images. ;) Here's a suggestion: Design the 'ideal' 2017 F1 car. Can you provide your take on which areas of the new rulings provide the best possibility for performance exploitation? Edit: Perhaps to break apart from you're more educational videos on clear cut subjects, provide your thoughts on what racing formula currently provides the best engineering challenges, viewer spectacle or racing? What would you want to see in the rulebook of F1, F:E, LMP1, etc? Edit2: Maybe an idea to discuss past innovations and what their impact has been? E.g. F1 2009 - Brawn: Double Diffuser, F1 1992 Williams: active suspension, F1 1979 Lotus: Ground Effect aero. etc.
Solid state batteries are touted to have 5 times the charging speed of lithium batteries, imagine what that would mean for regenerative braking when currently it takes 45 stops on ebike to recharge the battery 5% it would take 9 stops to charge 5% and 45 stops to charge 25%. A solid state battery is also touted to have 2 twice the range in the battery size of current lithium batteries so what you would have in a solid state battery is a 75ah battery in the package size of a current 30ah lithium battery size after considering 25% regen charging and twice the energy density.
My understanding is that if you have a simple electric motor spinning it one way will spin the shaft forward (like moving the car forward). The load propels the shaft in that direction. But if you wanted to put the energy in the opposite direction wouldn’t the shaft need to be spinning in the opposite direction? But the Tesla is braking the shaft is still moving in the same direction as when the car is being propelled forward. What is my misunderstanding in how that works?
Bassically you are saying "Spinning the motor creates electricity". Not sure if you know, but that was discovered like 200 years ago. I would expect to explain actually the mechanical parts that get triggered when pushing the brake pedal.
A good video- all of our cardio equipment operates in the same way. We invert to AC and put it back to first demand in the circuit. A question- on EVs (and our cardio equipment) you can "increase" regenerative braking. IE on setting 1 I may get 1-2kw (in an EV) while slowing down and on setting 3 I get 6kw. What is the mechanism behind this? is the magnet's proximity to the copper wire a factor? Thank you for educating!
But do regenerative braking systems completely replace legacy braking systems with their brake pads? IMO, perhaps the most exciting science in EV. The day an EV conversion kit can replace a cars transmission, gear box and braking systems too that would be a game changer.
Well done. I've been driving a 2023 BMW iX M60, and have driven a few Tesla's - and therefore thinking about all of this a lot. The BMW generates reasonably significant regenerative braking force (adjustable, mine set to max) when you lift - I'd guess it is about 0.3-0.4G - - but there is no way to know (at least, via the instrument panel) if it adds additional regenerative torque when you use the brake pedal. I'm really curious about this. ( You explain the limits of regenerative braking - I think maximum charge rate into the battery is probably the limiting factor.) SO - do you have any ideas or data about what actually IS the max regen G force the car could generate without the help of the brakes?
So technically are we recovering/regenerating more energy when the car is coasting vs braking? i.e. no input energy to the motor, the rotor motion under the momentum and kinetic energy induces current in the stator windings, charging the battery? When we actually brake in an electric vehicle (e.g. slam break) wouldn't majority of energy transfer be in the form of heat through friction?
Thanks a lot for such an informative video. Please if you can also show the different mechanisms through which we can acquire the generated back emf for further purposes
Is there a place on how, not why, but how we can install regen on our conversions? Or maybe how to install a device that limits the regen when need it?
any electric motor or generator can be converted into each other. How to convert? But which conversion? You need to ask the right questions first, for you to get a correct answer. To give you an example, you can ask, how to convert your alternator as a regen? Since it is already a generator, it is already a regen. Just connect your crankshaft to the alternator when you brake, use engine braking, then you have regen. This alternator can be converted to a motor by adding a brushless motor controller that actually can turn the crankshaft, to run the aircon, or even move the car by engaging the clutch. You can run both in parallel. The alternator charger is primitive so you cannot get maximum charging at low speed. Use a charger like IMAX B6, to double the input voltage and output at a constant voltage with higher currents into the batteries. This is what is done by Tesla cars that have high regen braking. At low speed, the generator voltage is too low to charge batteries.
What I'd like to know is if this regeneration system would charge the battery to full if it were to be continuously rotated by force? That is the only thing that is really important; because if it could; then it could charge the car while you are sleeping; if it were to be connected to a wind turbine that would be what could even be part of the vehicle. Because that is really what everyone want; free energy to run their car; that is everyone that isn't making money with selling energy.
Where does the wear and tear go? With disc brakes like you said, it creates friction/heat and pads/discs need replacing. Surely regen braking creates a wear somewhere...The coils?
It doesn't go anywhere. What you call wear in a conventional breaking system is a product of friction. With regenerative breaking the resistance is in the magnets. The "wear" comes from heat loss due to inefficiencies of the motor and as explained the excess energy that needs dumping/buffering... So there is no "wear". As the terminology you are using is not applicable. The question should be wear does the energy go/where is the energy wasted/lost.
If I have to stop immediately as I take my foot off the accelator the car slows rapidly. ( at this point in an I.C.E. car you are still coasting) Then use the brakes to stop. The breaking time is so much faster and safer in an E.V. I can only speak for Tesla
my RX450h has a manual mode in the shifter. i use it only when on a steep downhill to get more engine braking and do not use brakeing! My question is did this also produce more recuperation ? i think not because this is limited , right ?
*Is it bad to ALWAYS drive in the B mode of my 2017 Accord Hybrid???its VERY VERY awesome how I dont need to push my break pedal as much as most people*
why cant it be done under normal operation ie, driving along normally as when wheels are turning, turning the "generator" and re-charging the battery, even though as you have mentioned the issues as discussed, still seems that even if a smaller charge has gone back to the battery its better than none ??
How do we engage reg braking? With traditional disk brakes, the driver hits the brake pedal to activate the brakes. With reg braking, what does the car driver have to do to activate it?
sory and i only wondering, why don't just use the tire rotation to converse kinetic to recharge instead of converting heat from the braking system? just wondering.
Tv show motorweek on pbs gave an EV a mpg equivalent. So how do they compute that? Probably in a dishonest way, by using regen breaking at the optimum level to lie and bump up this mpg equivalent. Remember the 'your milage may differ' when EPA required such MPG stickers on new cars?
I wanna know how this works with 3 pole electric motors I have a skateboard that has regen breaking and im assuming it powers one pole and the other two act as gens
Thank you for your video. Great video. I hope you can answer my question please. How much power do you think regenerating breaking can produce if not reduced at gradual deceleration? If the super capacitors just dump at a higher volume than battery can a super capacitors bank just step it down to slowly charge the battery back. For example the set of banks 1 gets the regen than dump power into two and dump into four and dump one at a time into the battery at a lot lower current. Could that be done?
!!** CAN SOMEONE HELP ME, I'M NOT TOO GOOD IN ENGLISH**!! please correct me if its wrong. 1:17 (wear on the pad or where on the pads?) 1:32 stand of wheel and accel configuration and basic connect all energy recover devices. 1:42 electric or drive murdac??
does anyone know how to improve the efficiency of Electromagnetic RBS ? what modifications in the braking system will allow the system to convert more amount of kinetic energy to electrical ?
Test drove the Tesla Model 3 awd. Hate the regenerative braking, felt like I slammed on the brakes abruptly and hard every time I took my foot off the throttle. Risk of getting rear-ended. Gets fatiguing holding your foot so lightly on the throttle in an attempt to maintain speed. Lawsuit: www.lemonlawcourt.com/tesla-regenerative-braking-lawsuit/
There's resistance on the motor, which is basically a braking force. But with regen system on a EV it converts motion energy into electricity instead of converting all of the motion energy into heat, like on a regular braking system.
Does anyone know how high performance brakes work in an electric car? I'd assume that regenerative brakes don't perform as well as standard rotors and pads and so surely if you were making a performance electric car you may end up having both types of brakes with a computer to balance them out.
A similar concept. The motors on modern hybrid cars are variable frequency 3-phase ac with 3 groups of coils around the rotating parts; no direct contact at all. They usually have 3 inverters that can work in either direction, so they invert an ac input to a dc output to charge the battery, or the other way round to drive the traction motor. The inverters use IGBT transistors - power electronics, in effect. Of course, there’s still a bit of heat loss due to the need to cool things down, but it’s better than chucking it out via friction brakes. Although this is specifically for road vehicles, on electric trains, roughly the same idea can be used, but in that case the spare power can be exported to the supply, not to charge batteries on board.
Hi Kyle , Me and my son enjoy your channel so thanks for that :). A quick question. In one of your vids you recommenced a cad software for car design. Could you remind me what it was? Thanks again. p.s. Found it :) Have a Great Christmas.
Electricity needs to be captured by FORWARD wheel motion and sent back to the main battery on a EV. Currently Regen Braking is hardly worth the money spent to make it. Forward Motion Magnetically Wheel Based is what is needed. Cmon Scientists ??? Wake Up.
Can you full some people into thinking that you've discovered an infinite energy Loop by charging your car while driving, no but seriously can you drive down enough Hills to charge the car while driving to 100%
You need to also drive the uphill before the downhill, which uses lot of energy. If you charged the batteries up a bit with an external charger at the top of a hill, then yes, I assume you could charge your car full on a long enough downhill. But it doesn't come free, you need to charge it a bit at the hill top, which means using up energy
Also why can we not be able to use say a petrol or diesel generator that could power the electronic charger that the car does need so that it is a true hybrid. Like a diesel electric train. The generator would only use small amounts of fuel and wouldn't be needed all the time as the car would be battery and if the ability to have regeneration on the non drive wheels again self powering surly that is the future. I hope some 1 a lot smarter than me can explain to a person like me why this is not happening. The same as why don't we use magnets more as it's free torque and end less and emissions free. Why can't we use them to power motors that can power a motor or at least a charger. I do hope someone can reply with a form or actual answer as it boggles the mind. ☺
80's sk8ing generators: power plants are far more efficient at producing electricity than small scale generators which is why they can produce it for far cheaper. A lot of energy is wasted in ICEs. They only utilise 20% of the energy of the fuel (except on fee advanced models). So, petrol is energy denser than battery but you throw away most of the energy you get from it anyway. Why not gen+motor: because 1 part doing two jobs is better than 2 parts. Simplicity is your friend here. Motors are heavy. And fewer parts mean fewer things to go wrong. I hope that comes close to answering your question I'm waiting for an answer for something else. 😅
Moin... interessantes Video! Gut gemacht!! :) Sag mal hast du zufällig dieses lebendige Wasser von so einem Wasserionisator schon mal kennenlernen können? Dieses Wasser ist einfach unvergleichlich! :D Ein Beispiel von mindestens 15 positiven Wirkungen: Wasserstoff schützt unsere Muskeln
So why can no 1 manage to have say rear wheel drive and then have a form of regen on the front seeing as the car is being driven. Even having a type of 4w drive system but rather than actually driving both sets of wheels it could drive front or rear and then a motor of some kind that could be turned on and off via a computer so that the car can in its self power it's self. And please don't think I'm being rude or funny it is a genuine interest and question. Thank you for how you do explain things.
Even if you used a regen system on front axle on a rwd car, it's not free regen. The energy you get from regen is away from the motion energy, which means that for all the regen power you need to use more power to drive the car. And since neither of the systems work at 100% efficiency, you'd end up using more energy to drive with front axle regen than without it.
Loads of mistakes in this video.... I think the point you are trying to make is the making of the field with the rotation of the wheel, at speed there is power to regen however as you slow down the motor does not make the field and therefore done not offer any braking at all And the Tesla problem is rather a simple g rate and t rate calculation for the application of brakes. The analogue would be to have a resistive controller with the brake pedal which would be equal to the collapse of the field with the designed brake force.
So do I need a separate generator to store the energy to battery or the motor alone will do the work. Why do we need a separate generator then ?? Please explain. Helpfull video
This video is good for elementary school kids. It's so simple that doesn't give any intuitive information. First, the toy you showed has commutators and it basically works the same way for generating mechanical power and regenerating of power. However, electric cars used inverters and selective battery charging. Also, you can use supercaps to save energy for a short burst of regenration. Supercaps increases the life of batteries and can be charge and discharge at the same rate. I don't know if Tesla uses supercaps though. Second, electric cars have bank of batteries and they charge and discharge them selectively with secret algorithms. Third, most of cost of these cars are their batteries. Fourth, with manipulating the battery Banks the e-cars can access to a lot of electric power for a short time specially if they have supercaps. That's why these car have such a high acceleration. Basically their acceleration is limited to their tires tractions which means they can go from 0 to 60 as same time as breaking from 60 to 0. Fifth, e-cars are mechanically very simple that translates to a fewer machanical problems and visits to the dealers.
bayareapianist good point
Little correction, there is no such thing as back EMF when motor work as generator, then it is called only EMF (motional emf).
Back EMF is specific only to motors working as motors. As the motor is turning, it also acts as a generator and generates a "back emf".
Yes. You are correct. Generator works on the principle that varying magnetic flux generates electricity in the conducting wires that cut the flux. His may be a slip of tongue.
but you didnt explain how an electric car is able to apply such a strong breaking force with just regen. most electric cars today can stop with just regen action, where is the power dumped if the batteries cannot take it all at once ? how is it handled, i feel that the title of this video didnt explain HOW regen BREAKING is done fully... maybe a follow up video ?
Mark Mark I think they just limit the regeneration and use disc brakes.
EVs often have battery cooling problems so I wonder if one could use a high performance radiator/water pump that’s powered by excess energy under breaking. The Model 3 Performance can’t go flat out around the Nurburgring. Using battery power to run a pump might increase battery temp but using excess power might drop the temp.
"where is the power dumped if the batteries cannot take it all at once" short of the battery already being full while breaking down hill when would your scenario ever happen?
BushidoBrownSama I’ve looked a little bit into it. Modern electric car batteries can’t take in charge as fast as they dispel charge. In other words they can’t regenerate/brake as fast as they accelerate. When the regenerative braking meets the max charging rate they start using the disk brakes to slow down.
They could use way more regenerative braking but there’s nowhere to put the energy.
@@grantlauzon5237 They use a certain type/class of super capacitors that can charge at high speeds and discharge at a manageable rate (regular super capacitors discharge all at once), then after the braking action is done it allows the electricity from the super capacitor bank into the battery at a manageable pace.
THANK YOU , I ALMOST WASTED MY TIME LISTENING TO A GUY HIGH ON SOMETHING...
Can you do a video on electrically controlled differentials and how torque vectoring is calculated and executed? Thanks
InstaBlaster.
Also a problem is that batteries overheat if you apply too much the energy from braking so cars have sensors that use the breaks to prevent this problems. Maybe a car with some kind of super capacitor could handle it better.
backemf is the voltage induced in the coils due to the changing magnetic field, not the torque
the backemf causes current to flow through the resistance across the motor terminals, and that negative current is what causes the negative torque.
if the motor was not hooked up to anything (infinite load resistance) then no current would flow and no torque would be applied on the shaft even though backemf is still being induced in the coil
I would request a video explaining why helical differentials are said to have no wear, when they still need to rely on friction of components to limit the slip. What makes their friction different than the friction that happens in other limiting diffs, such as viscous?
This explanation is fantastic, contains all the details without confusing me
You put a spring hooked up to a plunger and have it stick out of the front bumper about two feet. Then when you come to an intersection you just ram your car into the car ahead of you. This resets the plunger into your car which under spring load can now be used to push off the car behind you. Its efficient and a wonderful way to meet really angry people.
On a road car, what is it that starts the regeneration, is it initiated only on braking as opposed to coasting? Assuming it's on applying the brakes, is it possible to just touch the brakes light enough to engage the regeneration, but not hard enough to put much force into the brakes? I'm thinking about how to get the most recovery possible. Also, is there a measurement of how much braking force the regeneration provides in comparison to brakes? Lastly, are you aware of any systems that use some type of gearing to increase the braking force while regenerating? Seems this might be more possible with a flywheel, but I don't know enough about electric motors to understand if this would benefit or not.
Thanks for all your work on these videos, I really enjoy your approach to explaining concepts like this.
Probably varies a bit depending on the manufacturer. My Toyota hybrid car uses regen at any time when I let the car slow down gently without a brake application, and sometimes when using cruise control on a variable gradient. It can maintain a steady speed downhill using this - until the traction battery is fully charged!
This is why you get more mileage in the city compared to highway driving. In the city, it's stop and go with the regen compared to highway driving. With gas vehicles, it's contrary.
A few Mazdas have regenerative braking to power the 12 volt system and cut down on the alternator's work. I'm kind of dubious that it really saves much fuel, though.
Thanks man, saw this in my geography course, wanted to know more about it, so thanks for the help :)
LOL
Kyle you look like Daniel Radcliffe. Great video!
Best explanation I've seen. Thanks
As a guy with pads and rotors, i hardly ever even use my brakes. Mostly time my coasting and then when i need to i lightly brake. My car gets the highway rating mpg even though i drive about 60%city and 40% highway. When i drove a car with regenerative braking i was not a fan. It was harder to drive smooth and i feel like you have to gas for longer because once you let off the gas the car will start braking instead of coasting... idk im just a fan of already efficient gasoline cars.
How exactly can you control the strength of braking?
I assume it is done by decreasing the input power, but I want to know for sure.
(If it was explained in this video I'd've missed it. If that's the case it would be nice if someone could give me the time stamp ^^ )
I know this response is 3 years late but if I understand your question correctly you simply decrease the amount of pressure your foot is applying to the accelerator. The car (for example a Tesla) recognizes that when you take your foot off the accelerator, you would like to slow down. You rarely have to use the brake pedal in a car with regen breaking which saves you from having to purchase brake pads/rotors. Hope you’re doing well!
We have a Mitsubishi Outlander PHEV. My husband and I disagree about how to use the regen to best effect. The default position is off, and we can use paddle controls to choose 5 different levels of regenerative braking (up to b5). Is it better to keep it on all the time, even on journeys that include motorways, or to use it to brake, then release it when accelerating again? I think that if it’s on all the time (eg on most used setting b3), each time you take your foot off the accelerator the car slows down more than it would normally, so more power is needed to return to normal speed. I tend to only use regen when needing to actually brake, then I release it. Which is better, please?
It is best to drive on lowes level 0, the glide mode. Only when you want a car to slow use regen paddles.
When you drive in "regen" level your car is regenerating energy while you driving, but doing so it lose more energy than it produces, obviously. If you drive in level 0, there is no resistance and no energy los.
Best to drive on level 0!
To extende you range you mast plane you driving:
1. left your foot from the throttle and glid as long you are not slowing the trafic bihand, then
2. regen to slow, then
3 brake to stop.
Or C) You can feed it back to the power supply grid such as how electric trains do. Obviously this doesn't apply to battery-powered EVs but it's another place to send that energy.
Thanks, I was watching a video about the new GEN 3 Formula, E newest racing car. And I did not understand what is regenerated braking. 🙏🏼
very well explained!!! Better than what a car sales can do!
took me awhile but now I understand the basic principle of regenerative breaking thank you
Considering the fact that it only takes a few seconds to stop a car, the regen braking probably doesn't add a noticeable amount of MPGs. But considering the reduced brake wear, it probably wouldn't be surprising to see a set of brake pads last thru the life of a car. I go very light on the brakes of my Venza. So hopefully, I'll prove my theory.
Efficiency is only 60% do they use super caps to save the energy fast then transfer back to batteries
lol i was going to mention twin motors for regeneration then right at the end you covered it
thank you
If you assume that the battery is large enough to take all of the current, the regen strength depends on the size/power of the motor? Electric cars have different settings for how aggressive regen is. How does that work?
Great video as always Kyle. I know you've covered vortex generators in general, but can you make a video on canards and their various functions? Thanks!
*launching 1g that’s super car territory*
me: thinking about the time my friend pulled .8g’s in his mustang w/ boost
Could you use a some form of high end radiator/water pump that only activates when excess power os generated?
Electric vehicles often have battery over heating problems under sustained sport use. Using regular battery power to power a powerful water pump could increase the battery temperature. If the pump is only used when excess electricity is available it might improve the endurance of a vehicle on a track.
I've come across your videos two days ago and find them very informative en entertaining!
You're concise yet clear which is good and actually very hard to do in a short lecture/video.
Your current setup is of better quality (mainly sound) than your earlier videos from 2015, but I hope you can further improve on it with your presentation. E.g. have prepared graphics instead of the whiteboard lecture. I know it's a big investment in time/money to prepare graphics for videos, but I think your viewership would grow accordingly. Everybody loves nice images. ;)
Here's a suggestion:
Design the 'ideal' 2017 F1 car.
Can you provide your take on which areas of the new rulings provide the best possibility for performance exploitation?
Edit:
Perhaps to break apart from you're more educational videos on clear cut subjects, provide your thoughts on what racing formula currently provides the best engineering challenges, viewer spectacle or racing?
What would you want to see in the rulebook of F1, F:E, LMP1, etc?
Edit2:
Maybe an idea to discuss past innovations and what their impact has been?
E.g. F1 2009 - Brawn: Double Diffuser, F1 1992 Williams: active suspension, F1 1979 Lotus: Ground Effect aero. etc.
Solid state batteries are touted to have 5 times the charging speed of lithium batteries, imagine what that would mean for regenerative braking when currently it takes 45 stops on ebike to recharge the battery 5% it would take 9 stops to charge 5% and 45 stops to charge 25%. A solid state battery is also touted to have 2 twice the range in the battery size of current lithium batteries so what you would have in a solid state battery is a 75ah battery in the package size of a current 30ah lithium battery size after considering 25% regen charging and twice the energy density.
my longboard has this and it took me so long to understand what it was
Awesome video! Thank you!
My understanding is that if you have a simple electric motor spinning it one way will spin the shaft forward (like moving the car forward). The load propels the shaft in that direction. But if you wanted to put the energy in the opposite direction wouldn’t the shaft need to be spinning in the opposite direction? But the Tesla is braking the shaft is still moving in the same direction as when the car is being propelled forward. What is my misunderstanding in how that works?
Hybrid drives do not use flywheels for storing braking power.
No one dumps excess regen power though a resistor, they apply the regular brakes.
Bassically you are saying "Spinning the motor creates electricity". Not sure if you know, but that was discovered like 200 years ago. I would expect to explain actually the mechanical parts that get triggered when pushing the brake pedal.
A good video- all of our cardio equipment operates in the same way. We invert to AC and put it back to first demand in the circuit. A question- on EVs (and our cardio equipment) you can "increase" regenerative braking. IE on setting 1 I may get 1-2kw (in an EV) while slowing down and on setting 3 I get 6kw. What is the mechanism behind this? is the magnet's proximity to the copper wire a factor? Thank you for educating!
So, regarding electric scooters, regenerative braking occurs by coasting to a stop, not by using the electronic brakes, correct?
But do regenerative braking systems completely replace legacy braking systems with their brake pads?
IMO, perhaps the most exciting science in EV. The day an EV conversion kit can replace a cars transmission, gear box and braking systems too that would be a game changer.
I appreciate the fact you don't have a canned intro (complete with jingle) for your videos.
And he is not pitching a product in the video. 👍
Well done. I've been driving a 2023 BMW iX M60, and have driven a few Tesla's - and therefore thinking about all of this a lot. The BMW generates reasonably significant regenerative braking force (adjustable, mine set to max) when you lift - I'd guess it is about 0.3-0.4G - - but there is no way to know (at least, via the instrument panel) if it adds additional regenerative torque when you use the brake pedal. I'm really curious about this. ( You explain the limits of regenerative braking - I think maximum charge rate into the battery is probably the limiting factor.) SO - do you have any ideas or data about what actually IS the max regen G force the car could generate without the help of the brakes?
This is Amazing! Thanks!!
Very helpful, thank you!
So technically are we recovering/regenerating more energy when the car is coasting vs braking? i.e. no input energy to the motor, the rotor motion under the momentum and kinetic energy induces current in the stator windings, charging the battery? When we actually brake in an electric vehicle (e.g. slam break) wouldn't majority of energy transfer be in the form of heat through friction?
Graphene supercapacitors would be game changer
Thanks a lot for such an informative video. Please if you can also show the different mechanisms through which we can acquire the generated back emf for further purposes
Is there a place on how, not why, but how we can install regen on our conversions? Or maybe how to install a device that limits the regen when need it?
any electric motor or generator can be converted into each other. How to convert? But which conversion? You need to ask the right questions first, for you to get a correct answer. To give you an example, you can ask, how to convert your alternator as a regen? Since it is already a generator, it is already a regen. Just connect your crankshaft to the alternator when you brake, use engine braking, then you have regen. This alternator can be converted to a motor by adding a brushless motor controller that actually can turn the crankshaft, to run the aircon, or even move the car by engaging the clutch. You can run both in parallel. The alternator charger is primitive so you cannot get maximum charging at low speed. Use a charger like IMAX B6, to double the input voltage and output at a constant voltage with higher currents into the batteries. This is what is done by Tesla cars that have high regen braking. At low speed, the generator voltage is too low to charge batteries.
What I'd like to know is if this regeneration system would charge the battery to full if it were to be continuously rotated by force? That is the only thing that is really important; because if it could; then it could charge the car while you are sleeping; if it were to be connected to a wind turbine that would be what could even be part of the vehicle. Because that is really what everyone want; free energy to run their car; that is everyone that isn't making money with selling energy.
Where does the wear and tear go? With disc brakes like you said, it creates friction/heat and pads/discs need replacing. Surely regen braking creates a wear somewhere...The coils?
It doesn't go anywhere. What you call wear in a conventional breaking system is a product of friction. With regenerative breaking the resistance is in the magnets. The "wear" comes from heat loss due to inefficiencies of the motor and as explained the excess energy that needs dumping/buffering... So there is no "wear". As the terminology you are using is not applicable. The question should be wear does the energy go/where is the energy wasted/lost.
But how does it provide immediate or safe braking?
exactly
If I have to stop immediately as I take my foot off the accelator the car slows rapidly. ( at this point in an I.C.E. car you are still coasting) Then use the brakes to stop. The breaking time is so much faster and safer in an E.V. I can only speak for Tesla
Thanks , Understood !
my RX450h has a manual mode in the shifter. i use it only when on a steep downhill to get more engine braking and do not use brakeing! My question is did this also produce more recuperation ? i think not because this is limited , right ?
Harry u are no longer a wizard XD
*Is it bad to ALWAYS drive in the B mode of my 2017 Accord Hybrid???its VERY VERY awesome how I dont need to push my break pedal as much as most people*
why cant it be done under normal operation ie, driving along normally as when wheels are turning, turning the "generator" and re-charging the battery, even though as you have mentioned the issues as discussed, still seems that even if a smaller charge has gone back to the battery its better than none ??
How do we engage reg braking? With traditional disk brakes, the driver hits the brake pedal to activate the brakes. With reg braking, what does the car driver have to do to activate it?
Still doesn`t explain how does it apply the friction (sometimes in different levels based on what setting you have).
how do you control how much braking force is applied?
sory and i only wondering, why don't just use the tire rotation to converse kinetic to recharge instead of converting heat from the braking system? just wondering.
How does regenerative braking compares to costing in neutral ???
Tv show motorweek on pbs gave an EV a mpg equivalent. So how do they compute that? Probably in a dishonest way, by using regen breaking at the optimum level to lie and bump up this mpg equivalent. Remember the 'your milage may differ' when EPA required such MPG stickers on new cars?
I wanna know how this works with 3 pole electric motors
I have a skateboard that has regen breaking and im assuming it powers one pole and the other two act as gens
Can it also charge moving forward?
I am looking for this kind of channel only.
Thank usir
great. now explain regen for electromagnetic motors like induction type.
how do you control the level of resistive torque to control the braking force?
Highly informative video,,, good work
Good thanks for info 😊🐱
Thank you for your video. Great video. I hope you can answer my question please. How much power do you think regenerating breaking can produce if not reduced at gradual deceleration? If the super capacitors just dump at a higher volume than battery can a super capacitors bank just step it down to slowly charge the battery back. For example the set of banks 1 gets the regen than dump power into two and dump into four and dump one at a time into the battery at a lot lower current. Could that be done?
How can you charge EV battery by petrol generator in the boot while car is running?
no mention of an Inverter?
i really want a motor generator rig that you have at 2:02, could i buy one from somewhere?
How many hybrids use flywheels to store energy?
!!** CAN SOMEONE HELP ME, I'M NOT TOO GOOD IN ENGLISH**!!
please correct me if its wrong.
1:17 (wear on the pad or where on the pads?)
1:32 stand of wheel and accel configuration and basic connect all energy recover devices.
1:42 electric or drive murdac??
does anyone know how to improve the efficiency of Electromagnetic RBS ? what modifications in the braking system will allow the system to convert more amount of kinetic energy to electrical ?
Thank you . It was great explanation. I have one question "Is it possible to use Regenerative braking system along with DC brush-less motors ?
Permanent magnets in an AC motor electric vehicle?
Thank you for this
Test drove the Tesla Model 3 awd. Hate the regenerative braking, felt like I slammed on the brakes abruptly and hard every time I took my foot off the throttle. Risk of getting rear-ended. Gets fatiguing holding your foot so lightly on the
throttle in an attempt to maintain speed.
Lawsuit: www.lemonlawcourt.com/tesla-regenerative-braking-lawsuit/
Hahaha hahaha
So... How exactly does it brake? Or is it just a name?
There's resistance on the motor, which is basically a braking force. But with regen system on a EV it converts motion energy into electricity instead of converting all of the motion energy into heat, like on a regular braking system.
Does anyone know how high performance brakes work in an electric car? I'd assume that regenerative brakes don't perform as well as standard rotors and pads and so surely if you were making a performance electric car you may end up having both types of brakes with a computer to balance them out.
Does regenerating current is DC or AC?
How does this work with AC motors?
A similar concept. The motors on modern hybrid cars are variable frequency 3-phase ac with 3 groups of coils around the rotating parts; no direct contact at all. They usually have 3 inverters that can work in either direction, so they invert an ac input to a dc output to charge the battery, or the other way round to drive the traction motor. The inverters use IGBT transistors - power electronics, in effect. Of course, there’s still a bit of heat loss due to the need to cool things down, but it’s better than chucking it out via friction brakes.
Although this is specifically for road vehicles, on electric trains, roughly the same idea can be used, but in that case the spare power can be exported to the supply, not to charge batteries on board.
@@johnkeepin7527 I had no idea there were invertors that work in both directions.
do you know of anyone using capacitors for regen braking and then feeding that stored power into the battery or motor?
Hi Kyle , Me and my son enjoy your channel so thanks for that :). A quick question. In one of your vids you recommenced a cad software for car design. Could you remind me what it was? Thanks again. p.s. Found it :) Have a Great Christmas.
porsche 919 have AWD regenerative breaking right?
can you do a video where you make a telsa model s 2 speed gearbox please
i love this video
all car and trucks need brake pads or they would not be able to stop from sliding esp. on ice.
At 2:40.What the battery doing?
Electricity needs to be captured by FORWARD wheel motion and sent back to the main battery on a EV. Currently Regen Braking is hardly worth the money spent to make it.
Forward Motion Magnetically Wheel Based is what is needed. Cmon Scientists ???
Wake Up.
Can you full some people into thinking that you've discovered an infinite energy Loop by charging your car while driving, no but seriously can you drive down enough Hills to charge the car while driving to 100%
You need to also drive the uphill before the downhill, which uses lot of energy. If you charged the batteries up a bit with an external charger at the top of a hill, then yes, I assume you could charge your car full on a long enough downhill. But it doesn't come free, you need to charge it a bit at the hill top, which means using up energy
Thanks man...
How do you make it work like a generator? it just occurs naturally?
When the rotor of an induction motor is spun faster than the rotating magnetic field, electricity is generated.
Awesome! So let's say I'm in an electric go-kart, when I brake I fill my batteries?
If it's an induction motor go-cart, then yes! However, you'll need a rectifier to convert the generated AC back to DC to fill the batteries.
मिलेगाी. कब तक कार किंमत
Also why can we not be able to use say a petrol or diesel generator that could power the electronic charger that the car does need so that it is a true hybrid. Like a diesel electric train. The generator would only use small amounts of fuel and wouldn't be needed all the time as the car would be battery and if the ability to have regeneration on the non drive wheels again self powering surly that is the future. I hope some 1 a lot smarter than me can explain to a person like me why this is not happening. The same as why don't we use magnets more as it's free torque and end less and emissions free. Why can't we use them to power motors that can power a motor or at least a charger. I do hope someone can reply with a form or actual answer as it boggles the mind. ☺
80's sk8ing generators: power plants are far more efficient at producing electricity than small scale generators which is why they can produce it for far cheaper. A lot of energy is wasted in ICEs. They only utilise 20% of the energy of the fuel (except on fee advanced models). So, petrol is energy denser than battery but you throw away most of the energy you get from it anyway.
Why not gen+motor: because 1 part doing two jobs is better than 2 parts. Simplicity is your friend here. Motors are heavy. And fewer parts mean fewer things to go wrong.
I hope that comes close to answering your question I'm waiting for an answer for something else. 😅
Potential/Kinetic energy basically....
Moin... interessantes Video! Gut gemacht!! :)
Sag mal hast du zufällig dieses lebendige Wasser von so einem Wasserionisator schon mal kennenlernen können?
Dieses Wasser ist einfach unvergleichlich! :D
Ein Beispiel von mindestens 15 positiven Wirkungen: Wasserstoff schützt unsere Muskeln
So why can no 1 manage to have say rear wheel drive and then have a form of regen on the front seeing as the car is being driven. Even having a type of 4w drive system but rather than actually driving both sets of wheels it could drive front or rear and then a motor of some kind that could be turned on and off via a computer so that the car can in its self power it's self. And please don't think I'm being rude or funny it is a genuine interest and question. Thank you for how you do explain things.
Even if you used a regen system on front axle on a rwd car, it's not free regen. The energy you get from regen is away from the motion energy, which means that for all the regen power you need to use more power to drive the car. And since neither of the systems work at 100% efficiency, you'd end up using more energy to drive with front axle regen than without it.
Loads of mistakes in this video....
I think the point you are trying to make is the making of the field with the rotation of the wheel, at speed there is power to regen however as you slow down the motor does not make the field and therefore done not offer any braking at all
And the Tesla problem is rather a simple g rate and t rate calculation for the application of brakes. The analogue would be to have a resistive controller with the brake pedal which would be equal to the collapse of the field with the designed brake force.
Responding to a viewer request here, leave a comment to have yours! Enjoy the video!
Can you talk a bit about Formula E?
KYLE.DRIVES Thanks Kyle!
Can you talk about how plasma actuators can by implement into an aero package?
How many g can they get out of regen braking? 0.25g?
So do I need a separate generator to store the energy to battery or the motor alone will do the work. Why do we need a separate generator then ?? Please explain. Helpfull video
Almost overvolted my eboard because of electric braking