How to rewind a BLDC Motor (as a Generator) 

I know virtually nothing about electronics but you describe things in a way that's easy(ish) to understand. A lot of things you say goes over my head though but still it is enjoyable to watch. You speak English extremely well. You did make me smile when you called your vise a "wise". Thanks for the videos.

The electronics, mathematics and mechanics ratio in is video is the best. Thank you for the great content Scott, appreciate your videos.

2 years until i go to college and just because of your videos i want to be an electrical enginner

9:15 "SECHSPULSBRÜCKENSCHALTUNG" My brain: _"Windows XP shutdown sound"_

Sechspulsbrückenschaltung

Love the way your native language has ways of putting complete ideas, even processes into one word. @9:50 I see there's a word that you say on the Patreon page means the 6 pulse bridge rectifier, but similarly Schadenfreude, or even better, Backpfeifengesicht and Verschlimmbessern Interesting project, I used to make tiny motors for RC planes by rewinding the motors from old computer CD drives. Apart from the tedium of actually winding them, the different results that were obtained by the number of turns on the windings, diameter of wire etc was quite interesting.

After hearing 👂 this guy in all his videos my mind is blown. He sounds like a professer that knows what hes doing. Keep up the good work man

Hi, Just spotted a slight mistake that might be relevant in future videos. 26 wires with a diameter of 0.2mm do not equate to a 5.2mm diameter wire. You need to multiply the cross section area, not the diameter. In this case, it would be the equivalent of a 1.02mm diameter wire.

I literally just came to RU-vid to search how to rewind a motor... Great timing, lol

9:15, don't you mean an EVEN FUUUULLER BRIDGE RECTIFIER?

I would like to see a esc driving a car alternator hooked up to a bike or something. Great job man, you're the best!

Rule for watching Great Scott video. Rule 1: Like the video first Rule 2 : enjoy the video Rule 3 : after watching the video, think of what you're doing with your life.

Hey I am electrical engineering student and You are my inspiration. Always love your videos

Great Video as always! Man I love the moment when u suddenly change to german when u say ,, Brückenschaltung" just sounds funny 😂😂

Hi, as you are always asking for ideas, Igot one that would be awesome. As a hobby I do some FPV Drone flying and for that purpose people are typically using simple sony hs1177 cameras that provide a simple analog PAL (or NTSC) signal. This signal now is transmitted analog on the 5.8GHz band (at 25mW). The downside here is, that with the analog signal a lot of noise is received too. For that purpose a very nice project would be to find a way of converting the analog signal to digital with error-correction and maybe decode it back on the receiver. The main problem here is that the latency has to be as low as possible. For that purpose I'd also suggest to not use of-the-shelf Video ADCs but rather encode the signal line-wise or bundle a few lines at a time. Else collecting a full frame will always introduce quite a bit of latency by itself. And even if you think the above is a little too complicated to accomplish I am sure there would be very nice projects using the cheap fpv-equipment parts available.

This proves Mr.Pascal (Greatscott) is actually reading our comments, so please don't hesitate to give him reasonable suggestions for new videos.

I rewound quite a few motors for my quadcopters. When removing stator you need to heat it, cooling motor base is fine, but sometimes there is adhesive which will give up with higher temperatures. Also threading is common, so you always need to twist it and not just pull. Avoid stator damage by wrapping it in some cloth, leather or just paper. You want to avoid any sharp edges on stator and layer separation. For anyone trying it, consider double lacquered wire, since its more resistant to damage when hand winding. If you need winding scheme for different slots and pole counts calculator on www.bavaria-direct.co.za/scheme/calculator/ can be really helpful. Also use some heat shrink on wires exiting motor. With vibrations motor base can "bite" through enamel and short your phase to metal base. That starts to be problem when you attach your motor to grounded metal frame or something. Simple trick for removing enamel from wire is to use pill of aspirin and melt it with wire. It smells, but its fast and I prefer it over sandpaper.

this is why we like your videos, you listen to us and follow up.

Great work! Thanks for this video - I have a brushless direct drive washing machine motor I wanted to use as a generator on a wind turbine, but it needs re-wiring. Your guide and links make me more confident I can make it work.

Still better than RU-vid's rewind

Excellent job! Very informative and comprehensive video on converting a BLDC motor to a generator where the sample is an RC KV Motor. Thanks for this video as this saved me time and money from doing the exact same experiment to come up with the answers that I need where you have already able to provide. Keep it with these kind of informative videos.

This is the best generator video ever seen

get this man a few new pens

You can get automobile or truck alternator rectifiers which are 3PH and Schottky very low drop,and current ratings from 40 to 250+ amps. Brushless motors can come in very large sizes, replace the bearings with Hybrid Ceramic to prevent current loss through the armature and eroding the bearings.

9:45 - You connected the wires to the "what?" That just froze my poor Scottish brain for a few seconds. Then you did it again! I need a drink...

A variable load would take these generator videos to the next level. Its critical that the impedances in these systems are matched so that you transfer the maximum possiple power. You could possibly even try to design or use a MPPT system.

Hi friend, a tip from Argentina. Consider use schottky diodes for the rectiffier ;) you win a couple of volts...

I can't 'unhear' your inhaling after each line :D Good video as always! :)

Hopefully a motor rewinding tutorial. I'm thinking of to install a fork-mount motorcycle auxiliary projector headlights set in my bicycle and modify a bldc motor into a generator, and I also think of to make a solar-charging high performance eletric supercar that uses an electroproducing couple designed in a Tesla powertrain configuration for its powertrain. That's why I was waiting for a video like this. Btw, awesome work and tutorial as always Scott

We love your videos, but please don't hurt yourself when you ask us to stay creative and that you will see us next time :) Scott, you are really great, stay like that.

Love love love your vids. As a hobbyist they are perfect jumping off points as I attempt to improve my understanding of electronics.

Excellent video. I might share this with my students. It looks like you have created (3D printed) your own shaft coupler as well. Thanks again for your detailed demonstration.

Awesome German boy love you a lot wish you good luck with RU-vid and electronic projects

I wish they still had radio shacks..

I would surely leave the project while I was doing all the coils. I esteem you

i would put all his videos together grab some popcorn and enjoying his writing !😅😎 👏

Thank @GreatScott for this informative content. I learn alot by you. Thank once again

Nice! There's plenty of explanations of Faraday's law and so on for motor and generators on the Internet, but practical number of turns/output voltage for real BLDCs is more sparse. This video has given me much more practical information for my pedal generator for a hybrid bike project. I don't want any gears or chains, the whole point is simpler mechanics. Even after rewinding a BLDC I know I will probably still need some step up gearing though.

Thank you for inspiring me. I will change my future nearer to your current path, may it be AC or DC. The next discussion should be about cheapest and effective alternative materials for all parts? Casting techniques will be the last step? The dialogue will be much more interesting. Kudos from Malaysia.

Soon after the German word in 9:16, the BLDC went into hip hop dance with that 3d printed adapter 😂

10:21 in Y configuration the the end point voltage will be indeed sqrt(3)*fase_voltage, the current will be devided by sqrt(3). So the power will stay the same and not be lower like you mention in your video.

Finnaly a video that explains how you can change a bldc's specs :) thanks, maybe I will use it on my electric skateboard to make a direct drive with a low kv

Now days #greatscott extending his previous video topics and this is awesome👌

You should be my electrical teacher when i was at school sir.. :)

Your videos never get old. Cheers Scott!

Can you bring back your versus series. Maybe do one for power supplies. A generic chineese one and quality one (Meanwell etc). Do tests on them (overload, max temperature and so on) and a conclusion if its worth the money. Also keep up the german humour in your videos. It always cracks me up.

E.F.B.R even fuller bridge rectifier

It's amazing how much you know about electronics, mechanics, physics ! I'm jealous ;)

If you ever need a high voltage generator I can recommend a microwave oven motor that spins the plate for your food. I turned it and got zapped. I was like WTF. Than I measured the voltage and got 90V AC from hand crancing and over 780V AC with a drill set to the lowest RPM. My multimeter only goes up to 800...

good video, I posted a similar method but with a PMDC into a universal motor 2 months ago, glad you did some calculations, hopefully I'll have a patent before part 2 video,apparently its easy approval for a provisional patent with a animated prototype internationally today.

You know what would be awesome? A blasting machine style hand crank firework igniter!

when switching fron delta to star config the output power remains constant

I was thinking about this a lot after previous video. So glad you took on the project and made it happen! Really great video! Would love to see if you can reasonably use it in some way to generate power. Like could it be used as a windmill, or something like that?

I am thinking of using an old manual grinding mechanism as a gear box.It increases RPM tenfold and is lubricated, has low friction losses.Thanks for the excellent video.

10:16 configuring either wye to delta doesnt change the output power. As the current decrease the voltage increases by the same factor. Wye to delta only changes current or voltage that is needed for some application.

also if you're having trouble with the adhesive just put the entire coil setup in some rubbing alcohol. it'll eat away at the glue/adhesive but not damage the coating on the wires.

wonderful handwriting!

wait...sechspuls brückenschaltung??wow,i cant even say that word

Very informative! Thanks for doing this experiment and posting. It gives me the data I need for a demonstration project I was having difficulty researching.

You said you count the number of turns "per pole". These are not poles but slots. The number of poles, for such a motor, is determined by the number of N/S magnets on the rotor. The number of poles is always an even number (N and S). On the winded part, the name is slots, even if there are protuding parts. And the number of slots can be an odd number. A 8 poles, 9 slots motor for instance has a very smooth torque curve...

Great video, it would be cool if you would make a detailed video about converting a car alternator into a motor. Basicly the oposite of this video

Thank you for answer the questions 🙏

What about trying to make a DIY 3 phase generator. Would love to see the result and what you could power. Looking forward to the video if you do it. Keep up the good work👍

You could have also used a buck converter to get the desired >1 volt output, and would have been the easiest of all three options.

the sechs puls brückenschaltung is amazing

BTW, the back emf of BLDC is kind of trapezoidal wave. To get the better output wave like sin wave, you need to use a PMSM motor.

9:15 GreatScott!: “Sechspuls-Brückenschaltung” Me, as a misunderstanding American: “Gesundheit”

Great!! This video and the previuos one are very good and usefull!! :) probabily can help me in future project. Just for curiosity: use BLDC (or stepper) motor as generator to provide DC will also decrease the efficency, because the output current (the currente that charge the capacitor) is only peaks and the bridge diode will no conduct for the overall period of the sinusoidal output voltage.

Some rubber or silicone mats would have protected those parts and given better grip for sure. Which reminds me I should make some for my new vice.

Oh damn @ 4:16 Another friend who walks the Sinistral path? #ONEOFUS!

For me I was able to convert crap motors into generators by just replacing the permanent magnets with neodymium magnets since they are just crazy better.

would be great to see a video from you trying to put a the magnets of these little motors with halback configuration.

I think you could have split the original winding into parts, as they are all made from individually enameled wire. Like 2 parts of 13 litz wires and connect them in series. Of course after dividing the wires of one side into two bundles on the second side you have to test each of the 26 litz wires from the strand individually, to which part-winding it belongs. But this seems doable.

I have been unsubscribe from your channel! I never believe when people say that and have never happen to me before. I watch all your videos, so is not because I have being watching you. If you notice a lot of subscription maybe the same happen to others. I now subscribed again! :)

Learning bldc.... how much i wanted to see your winding step by step and joining wire... becos i am beginners

You didn't have to rewind, just put the 26 winfingx in series in stead of parallel... Or 13 pairs in series... Another good one is to separate the 3 phases rectify them via voltage doubler on to capacitor pairs and put the 3 in series...

Sehr schön 👍

Nice Video like ALWAYS. Can you make a video about how to built a TDR sensor to messure volumetric water content of soils? These sensors are awesome and much much better than the EC based sensors but they are really expensive.

Dude. Heat the hole, cover the shaft with something to prevent heating the shaft. The hit or press the shaft out while at peak hotness.

Many thanks. Really well explained and reasoned.

Wie er einfach like a boss 6 puls Brückenschaltung sagt 😂 , gutes, informatives , lustiges viedo! Weiter so

I have a generator head from a old portable gas generator and my question is to you is can you wire up the generator head as a go cart motor? Instead of the gas engine turning the generator head and the generator head producing AC current, is it possible to introduce a DC current to the generator head so I can use it for a go kart motor?

Or instead of rewinding the motor, you could use your motor controller. FOC allows negative torque (current) which also enables full bus voltage generation (works similar to a buck converter, using the motor coils as inductor). This would need external power (or at least a buffer, to store startup power) tho

Thanks for the video!!! Love anything related to producing energy! Keep up the great work!!!!!!!!!!!!!!

I love this, thanks Scott

It's rewind time everybody!

Hey buddy you always get into advance tech make something about retro tech such as a vacuum tube or similar by the way this was a excellent video and I am Rabindra Sharma for India

You're likely shorting the laminations together by putting them in a vice and using pliers on them with nothing to protect them (like some wood or plastic between the stator and the vice or pliers. This can cause cogging, etc.

10:12 power stays the same for either configuration. Cause P=U*I and both of these are either phase or line. Please don't mix up those 2 cause in phase 1 is devided by sqrt(3) but in line the other is devided by sqrt(3)

Greaattt... upgrade/modify using knowledge... 👍

damn, DIY generators, that's ccool.

Nice vid. But it is useless to heat or cool down such small bearings because shrinking or widening a bearing is a percentage of its diameter at a temperature difference. The only benefit is to eventually loosen adhesives like Locktite.

Great Scott! - - - - I'll never be doing this!

Ok that's was about bldc but I think you should make a video about magnetism and more likely a way of magnetising objects or some sort of.... Overall this video was good . But remember you should always start from the base

Just get a hoverboard wheel, perfect generator

You are the best

If this was used as a regular bldc motor would it have a higher torque? This would very cool and efficient way to not use a gearbox

Greatscott im working on an experiment that is currently on hold, but i would like to see if you can continue whete i left off. I would like to turn a stand fan into a generator by rewiring. Or a washing machine motor. I know if anyone cando it you can. Keep me updated.

Awesome great scott.. Been a subscriber for a while now. I admired your skills. Please create a video for making a pure sine inverter. There is a ready made pcb board from aliexpress please test it. Thanks.

Suggestion : separate each threads from the parallel wire bundle, identify with continuity each one and connect them in series. That is not as good to achieve high voltages.