ELECTRICAL BEARING DAMAGE IN PUMP MOTORS

NINE STAR has developed a virtually foolproof process for protecting vertical hollow-shaft motors from the electrical bearing damage caused by stray shaft currents.

Although destructive currents can occur in any motor, most bearing damage in motors controlled by variable frequency drives (VFDs), also known as inverters or simply as drives. VFDs can save 30% or more in energy costs, but whether used to control a motor’s speed or torque, they often induce shaft voltages that discharge through the bearings, leaving fusion craters — pits in the bearing balls and race walls. Concentrated pitting at regular intervals along a race wall can form washboard-like ridges called fluting, which causes excessive noise and vibration. By this point, bearing failure is often imminent.

Linqing Nine Star Bearing Science & Technology Co., Ltd            

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

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