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Blog#18 - Portable iron


Last tutorial - PORTABLE SOLDERING IRON V3
Check here my last tutorial. I hope that you will like it. Keep up you guys!

last tutorial


Brushless motor on a PCB
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Author: Andrei
09/09/2018

Looking over videos on youTube, we've found a video by Carl Bugeja and think it is very interesting. He presents a tiny PCB that are actually coils for a triple phase brushless motor. A brushless motor will create a magnetic field with the coils and push or drag some permanent magnets, in this case some neodynimum magnets. The change of polarity of the coils is made electronically. The board, as we can see has 6 coils on both sides of the PCB to increase the magnetic field created. In the middle it has space for a small bearing on with the top side of the motor will be placed.

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For tests, he measured the resistance of the winding for each coil. We have 3 main windings divided in 6 poles in a star configuration where the ends of all coils are joined togheter. He also made tests for torque and currend draw. Of course, to power this kind of motors, we need an ESC or electronic speed controller that will apply the signals to the triple phase input of the mototor.

I really like the design. It is so small and simple and it could also be improved. And that what Carl Bugeja did for his second version. He placed a ferrite layer belwo the PCB and that increased the torque up to 1.5 grams from 0.9 grams. That is a big improvement. During tests, the temperature of the PCB reached 70 degrees C and with the ferrite layer even a bit more.


He even tried a double layer of magnets to improve the torque but with no success. So adding ferrite layer was the good option to go. His final proposal is to use a delta configuration instead of the star made for this board since that would eliminate the voltage drop on one of the windings so the current would pass trough pnly one coil. But for that we should waid for next version.
And that was the PCB brushless motor. Check his videos for more information. And if you want to make your own PCB, check our sponsor page. Keep up you guys!







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