OT: VFD induced damage to motor bearings.

[OkiePC]

The more I've thought about this I'm leaning to some other kind of damage to the motor. A 40 HP motor doesn't like to stop suddenly. There are a couple of hundred pounds in motion and when the hydraulic pump seized the motor was almost instantly decelerated until the coupling sheared. That means a lot of flexing happens in the motor. I told management before I left that the motor might be toast. We'll have to see what we find when the repair shop gets the motor cracked open.

I have seen a 20HP motor end up with an egg shaped stator housing after one such incident...not premium eff., but still made perfectly straight rotor rub...