noise from CIM motors driven with Victor controllers

[philso]

Hello

I am a first time mentor working with a team where the members are competing for the first or second time.

Can anyone confirm that the growling noise we are getting from the drive motors at "low throttle" is normal?

The main drive motors are a pair of CIM motors. The motor controllers were recently changed from the (black) Jaguars to the Victor controllers. There was no perceptible noise when using the Jaguars. Some of the team members are worried about burning up the motors or controllers because of the noise.

I found some threads (such as http://www.chiefdelphi.com/forums/sh...ad.php?t=83973) indicating that the switching frequency of the Victors is about 150Hz whereas the switching frequency of the Jaguars is about 15kHz. Based on this information and my experience doing R&D on 3-phase motor drives, I would expect the motors connected to the Victors to make the noise that I am hearing.

Thanks.

Phil