Best Practices for Mitigating Bearing Damage

Manufacturers and users of inverter-ready motors should strive to protect the motors’ bearings as well as their windings. The following measures have proven effective under actual operating conditions and should be considered for inclusion in any NINE STAR standards updates:

For motors above 100 hp, in which both circulating currents and common-mode voltages can cause bearing damage, an insulated bearing on one end and a shaft-grounding ring on the other provides the best protection from electrical bearing damage.

For motors 100 hp and less, adding a shaft-grounding ring either inside of a motor or externally effectively protects bearings and attached equipment from currents.

Linqing Nine Star Bearing Science & Technology Co., Ltd 

( Insulated bearing, Hybrid ceramic bearing and  Brass cage DGBB)

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