If I have a MOSFET (or a number of paralleled MOSFETs) driving a motor, what determines the maximum bandwidth (PWM frequency) at which I can excite a motor phase?
Is this only a function of the total gate capacitance of the MOSFETs and the current rating of the MOSFET driver, or are there other factors that will be at play here?
Best Answer
There are several factors that you must trade off to decide on a switching speed.
A lot of motors get run around 30 kHz, just above the human audible limit. That may piss off all the dogs and bats in the neighborhood, but you'll just hear a smoothly running motor.