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PWM drive related bearing failures

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2 Author(s)

The phenomenon of motor shaft voltages producing circulating shaft currents has been recognized since the 1920s. When a motor is operated by sinusoidal power, shaft voltages are caused by alternating flux linkages with the shaft. This article investigates the phenomenon of induced shaft voltages caused by PWM AC variable speed drives and discusses methods of mitigating their harmful effects

Published in:

Industry Applications Magazine, IEEE  (Volume:5 ,  Issue: 4 )