3 phase inverter for AC induction and servo motors


Author Message
nickskethisniks
Guru

Joined: 17/10/2017
Location: Belgium
Posts: 312
Posted: 09:17pm 28 Dec 2020      

Have fun Peter!
This will be a fun project I will follow from close by :)

You can use some isolation opamps like: acpl-c87, hcpl7800,... for measuring the phase voltage/ current.

I once tried to make a simple 3 spwm with a CY8CKIT-059uC, I used 2  potmeters, 1 for the amplitude and one for the frequency, it was easier to program for me then the arduino. I could do it with internal hardware, comparing a sinewave with a triangle wave. But I think I ended up with using a lookup table.
A colleague of mine did the same but programmed “space vector”, that way you can extract more power from the same DC bus. We tested it on a small induction motor.
It has some nice internal hardware you can set up without using uC power/clock cycles. It has free programming software with lots of help/information pdf’s and basic examples.