Re: [avr-chat] OT: Motor vibration due to PWM harmful?

[Christopher X. Candreva]

On Thu, 26 Oct 2006, Erik Christiansen wrote:

> While fooling with FET drive for a 200 watt DC motor, there was a fair
> howl emanating from the motor when the PWM frequency passed through
> mechanical resonances. I've read of ruined bearings in large motors, due

This is a subject that has come up a few times in comp.robotics.misc , along 
with solutions for stopping it, that I don't fully remember now.

One thing I remember is that changing the PWM frequency can reduce or 
eliminate it. I think reducing mine helped.


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