How to rewind a BLDC Motor (as a Generator)

  • 🎬 Video
  • ℹ️ Published 4 лет ago

Websites which were mentioned/shown in the video:

In this video I will show you how you can disassemble a BLDC Motor and in which manner you have to rewind its copper wires (motor phases) in order to lower the kV rating of the Motor. This way the motor features a lower maximum RPM and thus can be easier utilized as a generator. Along the way you will also learn a bit about the delta and star wiring of such a motor and their advantages.

Thanks to JLCPCB for sponsoring this video

2011 Lookalike by Bartlebeats
Ecstatic Wave, Jens Kiilstofte

💬 Comments

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

Author — Cold Wolf



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.

Author — Random Electronics and Displays


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?

Author — Chazz7555


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.

Author — Bob-a-FET


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.

Author — Jeff Cooper


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.

Author — Master Traders Ph


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.

Author — Bill Kerr


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

Author — KingSlimjeezy


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.

Author — pEEEnoy TV


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.

Author — Simon Bethke


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.

Author — Christian Gingras


Hi GreatScott! Can you make a video where to explain the benefits of the brushless motor as a generator? I want to know the voltage and its power. Can this be used as a battery charger for example?( Off course with all the equipment needed)

Author — Adi Tuță


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.

Author — Lutz Sommer


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.

Author — thom1218


When I saw this video, I had a question:
if I want to make a wind generator, should I connect a modified engine (like the one on the video, but bigger) to the generator shaft?
Or should I create a winding around the circumference of the generator and use the motor shaft as the source of rotation for neodymium magnets?

I was also thinking about connecting several generators to the circumference of the generator ... it would gain power, but it would be difficult for the wind to move the whole blade system.

Author — diego g.


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.

Author — geobruce


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)

Author — eastwardeye5


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

Author — Leonelf


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.

Author — Bryan St.Martin


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.

Author — Eh Wot