In our previous issue, we noted that unbalanced current flowing through the bearings can destroy them. But where does this current come from and what can you do about it? Three sources and their solutions are: Internal circulating current. Solution: Insulate the motor bearing opposite the drive end; even better, insulate the one on the drive end too. Common mode current using the motor shaft as a return path. Solution: Add a bonding strap between the motor and the load frame; ...

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