A non-conductive insulating ring (210) is inserted between a motor bell
(130) and a motor bearing (135) that supports a motor shaft (110). Stray
currents that normally discharge thorough the motor shaft and the motor
bearing to the motor bell are prevented due to the non-conductive nature
of the insulating ring. Additionally, the motor shaft is grounded to
provide a low-impedance alternative path to stray shaft currents. When a
fast-switching frequency converter is used to drive the motor shaft,
additional arrangements such as a common mode choke, reduction of the
switching frequency of the converter, and reduction of the turn-of/off
rate of a semiconductor device used in the converter, may be provided to
further reduce the stray currents flowing thorough the motor bearings.