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vedder.se forums • oscilating in FOC mode, not in BLDC mode
Page 1 of 1

oscilating in FOC mode, not in BLDC mode

Posted: 12 May 2017, 12:09
by tlonsky
Hi, i operate BLDC motor via FOC. When i try to operate it in BLDC mode with encoder i can get full control via RPM (from 100ERPM to 10 000 ERPM). But when i operate the same motor via FOC with encoder and i set the ERPM to some value the motor starts oscilating very quickly. Anyone some idea what is wrong?

Re: oscilating in FOC mode, not in BLDC mode

Posted: 12 May 2017, 15:43
by arvidb
Did you re-tune the PID controller after changing to FOC? FOC uses a different implementation (and frequency) of the speed PID controller, unfortunately, so you need to completely re-do the tuning.

Re: oscilating in FOC mode, not in BLDC mode

Posted: 12 May 2017, 18:48
by hexakopter
I noticed the same when I were playing around with the current plot (for the pole count measurement) with my eBike hub motor using hall sensors and FOC. I was expecting that the motor would spin with the constant erpm i put into the text field, but instead it was oscillating and I didn't know why that was happening. So I think that it is maybe a bug with the old firmware, but I haven't tested if it would work like expected in BLDC mode.

Re: oscilating in FOC mode, not in BLDC mode

Posted: 07 Aug 2017, 02:44
by slapshot136

Re: oscilating in FOC mode, not in BLDC mode

Posted: 27 Sep 2017, 11:25
by arvidb
Yes: https://en.wikipedia.org/wiki/PID_contr ... of_methods

(Sorry for the late reply, hopefully it will be useful for someone!)