Two things. Toroidal transformers are better at constraining stray magnetic flux which can induce noise on surrounding electronic circuits which is why they are commonly used in power supplies of professional audio equipment. If instead of a 50 turn tap on the primary, you instead have two 50 turn coils, you can then have a transformer for both 110v and 220v. Put the coils in series and it becomes 100 turns. Put the coils in parallel and it remains a 50 turn coil with twice the magnetic flux. You see this trick used extensively in older transformer based power supplies.
Could this be used for Fractul wood burning .I use a microwave transformer now. How ever someone gave me a Harmon kardon 7300. It doesn't stay on maybe 1hr or 2 then shut off. But this transformer is huge and the whole unit is a boat ancor.
Manufacturer and designer of toroidal turns tester 3500 A B or C. There still in service today 36 yrs after later. There are times the exact count of turns is critical. I did enjoy the video,nicely done!
Great video. One of the machines I work on uses one leg of 3 phase 208 on the primary side to produce one output of 120v and a second output of 60 volts from a toroidal transformer. I understand it much better now.
this reminds me of a gearbox. The fact that different connections can switch between different changes in voltage and current are sort of analogous to how different gear ratios produce different changes in angular velocity and torque
Thank you for the description and especially for showing respect for Nikola Tesla at the end, the greatest discoverer and inventor that walked this earth.
Also you have to bear in mind that the Bolt used to secure the toroidal transformer cannot be shorted with the Lid of the housing ( if metal) the bolt acts like a shorted turn & will cause issues. A firm i worked for yrs ago had this problem when we screwed the lid on the power supply & it just touched the securing bolt & created a dead short.
Typically I've seen a rubber or other insulation shield that rest between the hold down and the transformer. As well as the transformer is nearly always tightly wrapped with an industrial type of very durable plastic
I love being able to absorb this info with such ease. Thank you for the great effort put into the graphics and video over all is awesome. Should be mandatory in school. Can’t wait for this to be reverse engineered into levitation once we figure out the ambient voltage out planet produces
The background music is too much foreground and detracts from an otherwise very informative video. Try it without music, rely on the info you want to get across.
A steel toroid could be made by casting 2 halves, and then heating them again, and pressing them together, with a little extra steel on the edge, if you counter rotate while pressing them hot, they should be forced into the mold, and together, into one piece. You'd need openings at the edge of the mold, so the extra steel filings can come out. Also, 1 hole would need to be left in each half, so that pressure won't collapse or explode the toroid as it heats or cools. Then, drill and cut out all mounts, drill holes, etc.. and one final annealing to make sure it's one piece, along with other steel components, to be included in the device.
This is an amazing video, due to the fact you leave out the myth of electrons, and only mention fields which is all there is, at last somebody who knows what there on about, without talking about things that don't exist…….i.e electrons
Worked in a large candy plant back in the 1980' s and a lot of the chocolates & production equipment were made in Europe ( Switzerland Sweden & West Germany ) and they used torrid transformers a lot more then equipment/packaging machines made in the USA. believe they were al! under 100 VA. Never had trouble with one. Nice vidio.
For toroidal transformers, the screw must not touch the top and bottom of a metal case. Otherwise you have a coil with only one loop. It can only be attached at one point.
It’s inside the Compaq Lte Elite laptop’s light controller, and also found on today’s laptop LCD electric panel. The coil is turned on when choosing Bios, the DOS resolution causes that. I use Dosbox in Balanced mode, the coil is still on, but Dosbox doesn’t take up the whole display. The coil causes the motherboard to fix the smart battery part, because it is turned on. The battery’s chipset continuously calibrates the whole battery, the charging. During 1 discharge, only one option is turning on, but still works. In phones, the coil fixes the chemical battery, removes the memory effect, because it is inductive. You can buy mouse and usb cable, that looks like the coil. Suitable to fix devices that don’t have Bios login, for example Samsung with OTG cable.
It may no longer be considered 'magic' per se, but thus far, everything that we know or claim to know about electricity and magnetism is 'theory'. A set of beliefs that describe how we can interact with, and what we can expect from, as a reaction or result of our low brow fumblings are still known as electrical 'theory' and even recently here on TH-cam certain foundational beliefs were contested. At our current level of understanding, it would be impossible for us to claim one person was right the other one was wrong, as it's all theoretical anyway and what was in question was concept and not solutions. Much the same as dark matter, we can make predictions that appear accurate, equations that add up mathematically, and other highly accepted 'promises' that feed into our beliefs, yet we remain as childlike in our understanding of magnetism. No tangible evidence, only enigmatic forces that humans have monkeyed around with just long enough to be forewarned or smart enough to know better than to stick our finger into a light socket. I do find it all a bit amusing. Likely, there are fields of techno knowledge regarding this mysterious force that those of us on earth have yet to even conceptualize, let alone harness. I hope I live long enough to see the advances I believe exist, and what seems like magic or impossible to us now will become a common part of our everyday lives. It's inevitable, these advances, of which and I don't even know the extent of what I am imagining. And in hindsight many of you more highly educated will be thinking- "it's been there right under our nose all along, totally obvious, not hiding at all, just waiting to be found, so what took us so long?" I suppose we are just waiting for the next download of data to be dropped off by the aliens. Hard to say who our next Maxwell or Einstein will be.
Is your reference to Mechie an Australian slang for mechanic, like , you specialize in the automotive field? If so, I have a great respect for a person who undertakes such an eclectic array of devices and gadgetry that must work together as one- like that adage, the sum of the parts is greater than the........uh, devices that add up to more than the pile of parts itself. The reason you hold such high esteem is the simple fact that when that machine is operating people's lives depend on it. Yeah plumbers get paid a lot, and I. T. guys they're pretty slick but for the most part none of those guys work is going down the road at 90 miles an hour or I mean 120 kilometers per hour
Efficiency can reach 95% or more, whilst a more "conventional" iron laminate transformer will be 90% or less. Toroidal transformers are primarily about efficiency and minimising stray magnetic fields, but they are also somewhat more compact. However, transformer efficiency is a complicated subject, but ultimately what you want to do is minimise hysteresis losses as the magnetic field changes and inducing eddy currents in the core (also, not saturating the core either). Then there is minimising resistive losses too, so there is no simple answer. But if you want transformer efficiency, you don't do it at mains frequencies using iron cores, even if they are laminated.
@@TheEulerID That clears up my questions on the transformer efficiency. That leaves one more that came to mind. When it comes to old welders that are the transformer types most are the e-type which have an aggressive arc. I used an old triodial type which really had a smoother arc with the same penetration. Why is that so ??? Thanks Steve and good day too. vf
@@victoryfirst2878 This is what came to my mind watching the video. I've had a few old style welders with the laminated cores and wonder how well a toroidal transformer would work in a welder. Would a solid, non-laminated toroidal core be just as efficient as the laminated regular ones? Seems like multiple taps in the secondary coil would make selecting your output amperage easy.
@@siggyincr7447 Would cutting out the laminated core from an old three phase auto-transformer placing the three laminations side by side and cutting out the donut keep the efficiency of say a one piece unit ??? Also, would using multiple wires instead of one large output wire improve the overall performance and duty cycle ??? Thanks vf
@@victoryfirst2878 I'm not an expert on any of this. But as far as I understand it, making a laminated toroidal core should help reduce eddy currents and the associated losses in efficiency and heating of the core. You could use multiple wires for the secondary winding which would make it a bit cheaper by only using the heavy wire on the section that would be used for lowest voltage/highest amperage output. Then keep progressing down the wire sizes and connecting them at the tap points.
Years ago, I caught the dickens trying to find the formula for torus transformers. At least for the younger people, put it in more books when you write them.
@R Zarc You are right but I am sure that the transformer in a switch mode psu has actually got a ferrite core, not an iron core because of the high switching frequency.
@dorel49 0 seconds ago A question: I have a step-down toroidal transformer (220V to 110V) but it only has three outputs; one of the coils, I don't know which one, has the ends connected, resulting in a single wire and I don't know how to connect the others to the output to get 110 V.Normally I have to have 4 wires: two from the first coil and the second from the second coil and in this way it was easy to connect Reply
I have a torroidal transformer with primary voltage of 220vac and secondary voltage of 16 0 16 vac, I want to add another secondary voltage of 240vac at 100mA for vacuum tube power supply, how I am going to rewind this? What is the applicable wire gauge? Can I compute for the number of turns? Thanks for your advise..
Only if you count number of turns on old secondary as you take it off then from input - output ratio you can calculate turns on primary. This will then be number of turns for new secondary so they match, assuming no losses.
@@rodd8170 thanks for your reply bro what if try to wind 10 turns of gauge 18 awg magnet wire and measure the output voltage and calculate total number of turns to obtain 240vac? Is that possible instead if dismantling the secondary windings..?
Generally a good tutorial but I do have a bone to pick over one comment. You stated Toroidal transformers are always used to reduce a voltage, this is certainly not the case as they are almost always used in high voltage strobe power supplies and as output transformers in electronic sirens.
No, he said that THIS transformer is used to step down the voltage as the number of windings on the secondary side is lower than the number of windings on the primary side.
That first illustration at 0:038 had me scratching my head. If an extremely short pulse of DC current is driven through one wire, does the parallel wire not experience a transient induced voltage of opposite direction, reversing the flow of electrons in the adjacent wire? For AC current, would the phase not be shifted 180 degrees, effectively inducing current with "opposite direction" and polarity?
EE here. - Depends on the application, In transformers there are subtractive and additive arrangements, depending on the polarity of the windings it is possible to create combinations to obtain specific voltages, (This since we know that a force can be added, subtracted or neutralized according to its magnitude and direction) now we must remember that transformers are machines that work if and only with alternating current, direct current being a "constant" does not have changes, so it does not produce any effect on the winding (except heat and eventually destroy it by short circuit, since we must remember that for electricity this is just a resistance). -the only pulse we would have would be during the connection and disconnection of the DC, that is when there is a change of value from X to 0, But there is no negative step, unless we invert the polarities and repeat [as close to these alternating pulses would create a square wave, however this wave would no longer be DC but would become AC]. -On the other hand, the behavior of the windings is not the same under a sinusoidal wave as under a pulse of square waves, triangular waves, etc. and although there is an induction, we must remember that electricity must have a path through which to flow. [in this case in the secondary]. So in ideal and simple conditions, if there is no load through which the voltage flows connected to the other conductor (potential difference is theoretically 0). -[It's like filling a bottle of water without leaving any air inside and shaking it, the water simply won't move, because it has nowhere to flow]. or imagine a pipe completely full of water with a faucet, we know that there is more water [like from a tank] trying to flow, but when the faucet is closed, there is no way to flow and the water does not move, or there is no more water in the first stretch of the pipe than at the end, [Potential Difference 0]. -If we put ourselves more into practice, let's imagine a simple battery, we know that the energy is inside but if there is nothing connected to the terminals it cannot flow and a change of state is not generated [of course this being perfect and omitting more technical things like self-discharge, electron leaks in the insulation etc]
How to get the VA rating of a toroidal? My amps toroid (230V) has secondary of 30Vac and the fuses for it (secondary) are rated 6.3A before it goes to the rectifiers. I still look for the actual VA rating...
@Google user thank you so much. I was thinking it might be a 160VA transformer, used in a 50W/8R amplifier. The 6.3A fuses are just above the average 5.5A max limit for the 160VA trafo's I've seem online. Once again, thank you very much.
Why is there loss of 14v from hand wound toroid transformer output with separate winds on core not overlapping. The frequency of primary was matched to source AC, the primary and secondary windings are in same direction and entire ring core is covered with wire , but 2 separate sides. I thought the core under Primary caused induction into separate secondary windings. Desparate.
That's also how our planet, the other planets, our sun, every other star, every solar system, every galaxy, the universe itself...even we humans & everything else on this planet works.
6:46 No, don't do that shit. Let's assume you need a 15 V, 0v, -15v and 5V. You will need a 2 separate coils for 15, 0 and -15, but if you pull out a 5v output instead of a separate coil, you can throw out of balance the 15 circuits, and this may be bad specially for sensitive application like high end audio. It is always better to have individual coils
That explanation is in danger of making it appear we can have 22V at 10A simultaneously with 44V at 5A yet still have an input of 220V at 1A in the primary. That is definitely not the case, and attempting to do that will overload the transformer and very likely cause it to overheat. So we can draw, way, 2A at 44V and 6A at 22V, but you cannot exceed the rating of the primary coil (or, for that matter, the current rating of the secondary as in this example half the secondary coil with the centre tap will be carrying 8A and the other half 2A. Not an issue here, but it can be on transformers with multiple taps so the current rating of any single segment must not be exceeded. Toroidal transformers are primarily about efficiency and minimising stray magnetic fields.
cool the toroidal shape also has a weird physical property that input windings can mesh with output windings, also 3d math has a weird effect on toroids as well, I wouldn't be surprised if the shape was what was causing the bizarre effects.
The high efficiency of a toroid transformer along with its high output current is due to the windings wound in such a way that they literally follow the magnetic inductance that surrounds the iron core.
A few kVA? Define few as I know of one that is capable of 8kVA and another that will run at 12kVA. The one in my inverter will run at 7.5 without problems up North where temps are in the 60° range and has no problem with 6kVA down here.
why to use metal core, just wind secondary on primary coil, it is clear if coils are besides like in square transformer, metal is needed to transfer magnetic flux, but here is coil on coil ????
🙏🏼🇧🇷👍 Por favor, me gustaría ver una animación de los electrones moviéndose dentro del circuito ladrón de Joules. muchas gracias.🍀 🙏🏼🇧🇷👍 Please, I would like to see an animation of the electrons moving inside the Joules thief circuit. thank you so much.🍀
Why is it that our local transformer does not obey back emf because if it obey it then I high tension suppose not to power more than 1 transformer but an high can power a town why
![VirtualBrain [ENG]](http://yt3.ggpht.com/X7upR1XVhcILHv4-WcO9pyM9BixmnDf77KGoE8R6eqr9tzefxy-ouiO_dMwbxE_gAMVZz0hDDA=s48-c-k-c0x00ffffff-no-rj)
It only took 2 months scouring the internet and TH-cam, but I finally found an actual thorough explanation/tutorial. TY!
Two things. Toroidal transformers are better at constraining stray magnetic flux which can induce noise on surrounding electronic circuits which is why they are commonly used in power supplies of professional audio equipment.
If instead of a 50 turn tap on the primary, you instead have two 50 turn coils, you can then have a transformer for both 110v and 220v. Put the coils in series and it becomes 100 turns. Put the coils in parallel and it remains a 50 turn coil with twice the magnetic flux. You see this trick used extensively in older transformer based power supplies.
Could this be used for Fractul wood burning .I use a microwave transformer now. How ever someone gave me a Harmon kardon 7300. It doesn't stay on maybe 1hr or 2 then shut off. But this transformer is huge and the whole unit is a boat ancor.
Manufacturer and designer of toroidal turns tester 3500 A B or C. There still in service today 36 yrs after later. There are times the exact count of turns is critical. I did enjoy the video,nicely done!
Great video. One of the machines I work on uses one leg of 3 phase 208 on the primary side to produce one output of 120v and a second output of 60 volts from a toroidal transformer. I understand it much better now.
So pure and natural and correct this design, as Flux lines aren't ever square, but most humming/buzzing/vibrating xfmrs are.
this reminds me of a gearbox. The fact that different connections can switch between different changes in voltage and current are sort of analogous to how different gear ratios produce different changes in angular velocity and torque
Yup, transformers are electricity's transmissions.
Seems very similar indeed as a mechanic I can relate
Thank you for the description and especially for showing respect for Nikola Tesla at the end, the greatest discoverer and inventor that walked this earth.
Also you have to bear in mind that the Bolt used to secure the toroidal transformer cannot be shorted with the Lid of the housing ( if metal) the bolt acts like a shorted turn & will cause issues.
A firm i worked for yrs ago had this problem when we screwed the lid on the power supply & it just touched the securing bolt & created a dead short.
Typically I've seen a rubber or other insulation shield that rest between the hold down and the transformer. As well as the transformer is nearly always tightly wrapped with an industrial type of very durable plastic
I love being able to absorb this info with such ease. Thank you for the great effort put into the graphics and video over all is awesome. Should be mandatory in school. Can’t wait for this to be reverse engineered into levitation once we figure out the ambient voltage out planet produces
Schools are trash. Efforts for making these types of videos comes from creators heart, not from some school trying make business
@@saitamapreetsingh3057 Right on fella.
Hb
Great job with this!
Thank you, I learned so much from this video
Very good information
i love the way of your explation and the animation
Great Presentation , Thank U
The background music is too much foreground and detracts from an otherwise very informative video. Try it without music, rely on the info you want to get across.
This video is beautiful, thank you
Very nice , clear , illustrated , understandable video , a trillion thanks
A great channel for learning engineering stuff 👍👍
Well done, good demo.
Thanks for a very clear explanation
A steel toroid could be made by casting 2 halves, and then heating them again, and pressing them together, with a little extra steel on the edge, if you counter rotate while pressing them hot, they should be forced into the mold, and together, into one piece.
You'd need openings at the edge of the mold, so the extra steel filings can come out.
Also, 1 hole would need to be left in each half, so that pressure won't collapse or explode the toroid as it heats or cools.
Then, drill and cut out all mounts, drill holes, etc.. and one final annealing to make sure it's one piece, along with other steel components, to be included in the device.
Thank you for making such a useful video.
Video is very informative and useful.Thanks
This is so good, very practical, thank you!
YOu do this so well...THANKS!!!
This is an amazing video, due to the fact you leave out the myth of electrons, and only mention fields which is all there is, at last somebody who knows what there on about, without talking about things that don't exist…….i.e electrons
Thank sir 👍 your video is very helpful
0:09 a transformer doesnt control the amount of power delivered to a device, it controls the voltage being delivered to a device.
Nice work I’m good in the making of this using manual method
Please discuss the design of toroidal transfomers for impedance matching. Good video, btw.
th-cam.com/video/O2B4yliv6go/w-d-xo.html
Worked in a large candy plant back in the 1980' s and a lot of the chocolates & production equipment were made in Europe ( Switzerland Sweden & West Germany ) and they used torrid transformers a lot more then equipment/packaging machines made in the USA. believe they were al! under 100 VA. Never had trouble with one. Nice vidio.
I like it, I used it Electric Hog Stunner , Torroidal Core as Variac 1 kva, from 0-300 vac. Good Products. THANKS.
Wow very informative video. I love videos like this.
Nice to see how these work. I replace a lot of them on the refrigeration system's we have at work ( Pfannenberg ).
Good nice explanation
Sir, we need more video like this....
🙏🏻🙏🏻🙏🏻❤❤❤❤🙏🏻🙏🏻🙏🏻🙏🏻
Excellent video and presentation.
For toroidal transformers, the screw must not touch the top and bottom of a metal case.
Otherwise you have a coil with only one loop.
It can only be attached at one point.
Nice video little information… anyway thanks for the video…
Very nice presentation indeed
Nice graphics.
It’s inside the Compaq Lte Elite laptop’s light controller, and also found on today’s laptop LCD electric panel. The coil is turned on when choosing Bios, the DOS resolution causes that. I use Dosbox in Balanced mode, the coil is still on, but Dosbox doesn’t take up the whole display. The coil causes the motherboard to fix the smart battery part, because it is turned on. The battery’s chipset continuously calibrates the whole battery, the charging. During 1 discharge, only one option is turning on, but still works. In phones, the coil fixes the chemical battery, removes the memory effect, because it is inductive. You can buy mouse and usb cable, that looks like the coil. Suitable to fix devices that don’t have Bios login, for example Samsung with OTG cable.
அருமை... 👍
Glad to knows how it worked.. Thanks 4 this information
❤good,,informative.
Nice 👍🏻👍🏻 🇮🇳 || Kuki
Transformers are to cool thanks I was looking at that Tesla coil thunking
Excellent! Thx!
thx for the good content
Wonderful
I think it just combines the + and - charges in one area, diacharges the - and amplifies the + proportionally
Good Bro 👍👍👍💕
As a mechie, electricity has always seemed a little like magic, always fun to learn new things!
It may no longer be considered 'magic' per se, but thus far, everything that we know or claim to know about electricity and magnetism is 'theory'. A set of beliefs that describe how we can interact with, and what we can expect from, as a reaction or result of our low brow fumblings are still known as electrical 'theory' and even recently here on TH-cam certain foundational beliefs were contested. At our current level of understanding, it would be impossible for us to claim one person was right the other one was wrong, as it's all theoretical anyway and what was in question was concept and not solutions.
Much the same as dark matter, we can make predictions that appear accurate, equations that add up mathematically, and other highly accepted 'promises' that feed into our beliefs, yet we remain as childlike in our understanding of magnetism. No tangible evidence, only enigmatic forces that humans have monkeyed around with just long enough to be forewarned or smart enough to know better than to stick our finger into a light socket.
I do find it all a bit amusing. Likely, there are fields of techno knowledge regarding this mysterious force that those of us on earth have yet to even conceptualize, let alone harness. I hope I live long enough to see the advances I believe exist, and what seems like magic or impossible to us now will become a common part of our everyday lives. It's inevitable, these advances, of which and I don't even know the extent of what I am imagining. And in hindsight many of you more highly educated will be thinking- "it's been there right under our nose all along, totally obvious, not hiding at all, just waiting to be found, so what took us so long?"
I suppose we are just waiting for the next download of data to be dropped off by the aliens. Hard to say who our next Maxwell or Einstein will be.
Is your reference to Mechie an Australian slang for mechanic, like , you specialize in the automotive field?
If so, I have a great respect for a person who undertakes such an eclectic array of devices and gadgetry that must work together as one- like that adage, the sum of the parts is greater than the........uh, devices that add up to more than the pile of parts itself. The reason you hold such high esteem is the simple fact that when that machine is operating people's lives depend on it. Yeah plumbers get paid a lot, and I. T. guys they're pretty slick but for the most part none of those guys work is going down the road at 90 miles an hour or I mean 120 kilometers per hour
Nice video, thanks :)
Fabulous didactics!!!
Cool lesson. What animation software do you use? That animation is perfection.
It is listed in the description of this video.
thanks for video
Can you use the same windings count on both primary, and secondary to make an isolation transformer?
Yes
thank you
Super 👍
Interesting, TY...
good one
Which software you are using
Muito bem explicado. Valeu.
Is the core in toridal transformer a magnet?
@VirtualBrain [ENG] Why does a toroidal transformer start to hum?
I'm the manufacture for the inside Toroidal Cores 😁
bom trabalho
Pls avoid background music. Very irritating. The presentation is superb.
How efficient is this transformer type as compared to other types used ?? Peace VF
Efficiency can reach 95% or more, whilst a more "conventional" iron laminate transformer will be 90% or less. Toroidal transformers are primarily about efficiency and minimising stray magnetic fields, but they are also somewhat more compact. However, transformer efficiency is a complicated subject, but ultimately what you want to do is minimise hysteresis losses as the magnetic field changes and inducing eddy currents in the core (also, not saturating the core either). Then there is minimising resistive losses too, so there is no simple answer.
But if you want transformer efficiency, you don't do it at mains frequencies using iron cores, even if they are laminated.
@@TheEulerID That clears up my questions on the transformer efficiency. That leaves one more that came to mind. When it comes to old welders that are the transformer types most are the e-type which have an aggressive arc. I used an old triodial type which really had a smoother arc with the same penetration. Why is that so ??? Thanks Steve and good day too. vf
@@victoryfirst2878 This is what came to my mind watching the video. I've had a few old style welders with the laminated cores and wonder how well a toroidal transformer would work in a welder. Would a solid, non-laminated toroidal core be just as efficient as the laminated regular ones? Seems like multiple taps in the secondary coil would make selecting your output amperage easy.
@@siggyincr7447 Would cutting out the laminated core from an old three phase auto-transformer placing the three laminations side by side and cutting out the donut keep the efficiency of say a one piece unit ??? Also, would using multiple wires instead of one large output wire improve the overall performance and duty cycle ??? Thanks vf
@@victoryfirst2878 I'm not an expert on any of this. But as far as I understand it, making a laminated toroidal core should help reduce eddy currents and the associated losses in efficiency and heating of the core. You could use multiple wires for the secondary winding which would make it a bit cheaper by only using the heavy wire on the section that would be used for lowest voltage/highest amperage output. Then keep progressing down the wire sizes and connecting them at the tap points.
Years ago, I caught the dickens trying to find the formula for torus transformers. At least for the younger people, put it in more books when you write them.
I’ve seen the result of current transformers secondary windings being open when high power switchgear is energized, they explode like a bomb.
sir if assembling a 4.5kva toroid transformer with input 220v out secondary 110.55CT .. primary and secondary must be amperage
Interesting video, although the robot voice gets irritating after awhile. Keep 'em coming!
How often do you hear of a torroid transformer failing, compared to a switch mode psu, not very often at all.
@Mihály Tóth Yea in a laptop charger it is smaller, but in a pa amplifier they can be about the same size.
@R Zarc You are right but I am sure that the transformer in a switch mode psu has actually got a ferrite core, not an iron core because of the high switching frequency.
@dorel49
0 seconds ago
A question: I have a step-down toroidal transformer (220V to 110V) but it only has three outputs; one of the coils, I don't know which one, has the ends connected, resulting in a single wire and I don't know how to connect the others to the output to get 110 V.Normally I have to have 4 wires: two from the first coil and the second from the second coil and in this way it was easy to connect
Reply
Why just winding up the primary on the other side of the core not used?
I have a torroidal transformer with primary voltage of 220vac and secondary voltage of 16 0 16 vac, I want to add another secondary voltage of 240vac at 100mA for vacuum tube power supply, how I am going to rewind this? What is the applicable wire gauge? Can I compute for the number of turns? Thanks for your advise..
Only if you count number of turns on old secondary as you take it off then from input - output ratio you can calculate turns on primary. This will then be number of turns for new secondary so they match, assuming no losses.
@@rodd8170 thanks for your reply bro what if try to wind 10 turns of gauge 18 awg magnet wire and measure the output voltage and calculate total number of turns to obtain 240vac? Is that possible instead if dismantling the secondary windings..?
Yes that will give you a rough idea, trial and error to find correct nunber of turns if you dont want to disturb orig secondary winding
Generally a good tutorial but I do have a bone to pick over one comment. You stated Toroidal transformers are always used to reduce a voltage, this is certainly not the case as they are almost always used in high voltage strobe power supplies and as output transformers in electronic sirens.
No, he said that THIS transformer is used to step down the voltage as the number of windings on the secondary side is lower than the number of windings on the primary side.
That first illustration at 0:038 had me scratching my head. If an extremely short pulse of DC current is driven through one wire, does the parallel wire not experience a transient induced voltage of opposite direction, reversing the flow of electrons in the adjacent wire? For AC current, would the phase not be shifted 180 degrees, effectively inducing current with "opposite direction" and polarity?
EE here. - Depends on the application, In transformers there are subtractive and additive arrangements, depending on the polarity of the windings it is possible to create combinations to obtain specific voltages, (This since we know that a force can be added, subtracted or neutralized according to its magnitude and direction)
now we must remember that transformers are machines that work if and only with alternating current, direct current being a "constant" does not have changes, so it does not produce any effect on the winding (except heat and eventually destroy it by short circuit, since we must remember that for electricity this is just a resistance).
-the only pulse we would have would be during the connection and disconnection of the DC, that is when there is a change of value from X to 0, But there is no negative step, unless we invert the polarities and repeat [as close to these alternating pulses would create a square wave, however this wave would no longer be DC but would become AC].
-On the other hand, the behavior of the windings is not the same under a sinusoidal wave as under a pulse of square waves, triangular waves, etc.
and although there is an induction, we must remember that electricity must have a path through which to flow. [in this case in the secondary]. So in ideal and simple conditions, if there is no load through which the voltage flows connected to the other conductor (potential difference is theoretically 0). -[It's like filling a bottle of water without leaving any air inside and shaking it, the water simply won't move, because it has nowhere to flow].
or imagine a pipe completely full of water with a faucet, we know that there is more water [like from a tank] trying to flow, but when the faucet is closed, there is no way to flow and the water does not move, or there is no more water in the first stretch of the pipe than at the end, [Potential Difference 0].
-If we put ourselves more into practice, let's imagine a simple battery, we know that the energy is inside but if there is nothing connected to the terminals it cannot flow and a change of state is not generated [of course this being perfect
and omitting more technical things like self-discharge, electron leaks in the insulation etc]
How to get the VA rating of a toroidal?
My amps toroid (230V) has secondary of 30Vac and the fuses for it (secondary) are rated 6.3A before it goes to the rectifiers.
I still look for the actual VA rating...
Thickness of the transformer wires.
Connect more and more current loads until it burns out.
You will know in the future what power he can transfer ;)
@Google user thank you so much. I was thinking it might be a 160VA transformer, used in a 50W/8R amplifier. The 6.3A fuses are just above the average 5.5A max limit for the 160VA trafo's I've seem online.
Once again, thank you very much.
@Google user 190VA would be great!!! 😃
Great.
She blinded me with science
Why is there loss of 14v from hand wound toroid transformer output with
separate winds on core not overlapping. The frequency of primary was
matched to source AC, the primary and secondary windings are in same
direction and entire ring core is covered with wire , but 2 separate
sides. I thought the core under Primary caused induction into separate
secondary windings. Desparate.
That's also how our planet, the other planets, our sun, every other star, every solar system, every galaxy, the universe itself...even we humans & everything else on this planet works.
I see we're here for the same reason.
Ding ding. Ding. Ding… most people do not have a remote clue. As above, so below…
Other planets are transformers?
What's with the 1930s sound?
6:46 No, don't do that shit. Let's assume you need a 15 V, 0v, -15v and 5V. You will need a 2 separate coils for 15, 0 and -15, but if you pull out a 5v output instead of a separate coil, you can throw out of balance the 15 circuits, and this may be bad specially for sensitive application like high end audio. It is always better to have individual coils
I think the main problem is winding of the coil which prove to be difficult.
Not really, there are automated machines that can do that in just a few minutes.
That explanation is in danger of making it appear we can have 22V at 10A simultaneously with 44V at 5A yet still have an input of 220V at 1A in the primary. That is definitely not the case, and attempting to do that will overload the transformer and very likely cause it to overheat. So we can draw, way, 2A at 44V and 6A at 22V, but you cannot exceed the rating of the primary coil (or, for that matter, the current rating of the secondary as in this example half the secondary coil with the centre tap will be carrying 8A and the other half 2A. Not an issue here, but it can be on transformers with multiple taps so the current rating of any single segment must not be exceeded.
Toroidal transformers are primarily about efficiency and minimising stray magnetic fields.
cool the toroidal shape also has a weird physical property that input windings can mesh with output windings, also 3d math has a weird effect on toroids as well, I wouldn't be surprised if the shape was what was causing the bizarre effects.
The high efficiency of a toroid transformer along with its high output current is due to the windings wound in such a way that they literally follow the magnetic inductance that surrounds the iron core.
A few kVA? Define few as I know of one that is capable of 8kVA and another that will run at 12kVA. The one in my inverter will run at 7.5 without problems up North where temps are in the 60° range and has no problem with 6kVA down here.
sounds like a bomb
75-0-75 20amp toroidal transformer!!
Which wire need for primary & secondary ❤️
Input voltage 230
why to use metal core, just wind secondary on primary coil, it is clear if coils are besides like in square transformer, metal is needed to transfer magnetic flux, but here is coil on coil ????
🙏🏼🇧🇷👍
Por favor, me gustaría ver una animación de los electrones moviéndose dentro del circuito ladrón de Joules. muchas gracias.🍀
🙏🏼🇧🇷👍
Please, I would like to see an animation of the electrons moving inside the Joules thief circuit. thank you so much.🍀
Sir English wording hiding device system put it down below can't seen ur vedios
So this is how we get different speeds in a fan.
No mention of the high inrush current of a toroidal transformer
use a thermistor
Why is it that our local transformer does not obey back emf because if it obey it then I high tension suppose not to power more than 1 transformer but an high can power a town why
Fun fact: a Variac have this type of transformer
Almost, a variac it technically a Autotransformer (or Autoformer).