I have a 3 phase (3 wires) unicycle motor - 500W, 60V and a battery 50 - 60V (if I understand correctly - 16 cells x 3.7 V), 2.9 Ah.

I want to control this motor with Arduino PWM pin.

I understand, that I need an ESC to do that, but with what kind of specs? How can I know what voltage and amps should I look for? Maybe someone could explain this to me and also give some URL's to real ESC's.


  • This seems more a question for the Electronics forum. – Igor Stoppa Oct 21 '15 at 2:45
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    More specifically, you need a sensored ESC for low-speed torque. The control board of the unicycle typically is the ESC - in theory, you could develop a firmware that did just the motor drive function and accepted external control input, but there's typically already a six axis inertial sensor and a 32-bit ARM from ST on there, which is a substantially better computer than any of the ATmega based Arduinos - ie, that board does the entire job. If you just want a motor driver, you could hunt up a driver board for a smaller electric bicycle hub motor, as that is basically what you have. – Chris Stratton Oct 21 '15 at 4:27
  • Arduino.SE isn't really for shopping recommendations. Nor is it about electronics which are merely related to Arduino self. You could contact/visit a shop/webshop that has several ESC's, they should be able to get you a good advice and/or recommendation. – Paul Feb 20 '16 at 9:22

I would suggest you study Brushless 3 phase DC motors. It would take a book to explain how to do it. You will be creating three separate synchronized phases 120 degrees out of phase. That is not easy to do.

Try this link for a start: https://www.youtube.com/watch?v=E3BS8CO9APA This is also good: https://www.youtube.com/watch?v=WyQInXjpGwU Sorry I did not find part 1.

After you get through these and a few others you find I am almost certain you will pick another controller if you do the project.

Good Luck, Gil

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