VFD

89on35s said
As far as the VFD rated motor, just use a small external cooling fan blowing through the existing motor. Have it run whenever the motor runs. That will solve your problem. Running at a lower speed the motors own fan just doesn't move enough air to keep it cool.

Cley
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When a motor is running well below rated speed, and accessory fan on the back is the best option. I have done that a few times.

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