Motor PWM frequency
Posted: Fri May 19, 2017 5:20 pm
Hey Bitcraze -- I'm curious how the 328khz frequency was chosen for the motor driver. I'm researching this topic and not finding a ton of information, but what I'm finding suggests that motor efficiency drops off (and thrust is lost) if PWM frequency is too high, where most sources say "too high" is in the range of 30-40khz.
Have you conducted any thrust/efficiency tests of the motors at varying PWM frequencies? Could you explain a bit more about the comment in motors.h that reads "CF2 PWM ripple is filtered better at 382khz" (aka, what's a PWM ripple?)?
Thanks
Sean
Have you conducted any thrust/efficiency tests of the motors at varying PWM frequencies? Could you explain a bit more about the comment in motors.h that reads "CF2 PWM ripple is filtered better at 382khz" (aka, what's a PWM ripple?)?
Thanks
Sean