Effect of PWM Inverters on AC Motor Bearing Currents and Shaft Voltages

  title={Effect of PWM Inverters on AC Motor Bearing Currents and Shaft Voltages},
  author={Jay Erdman and Russel J. Kerkman and Dave Schlegel and Gary Skibinski and Allen Bradley},
wavefronts especially increase the magnitude of the above electrical problems, leading to motor bearing material erosion and early mechanical failure. Previous literature suggests that shaft voltage-bearing current problems under 60 Hz sinewave operation are predominantly electromagnetically induced. It is proposed that under PWM operation these same problems are now predominantly an electrostatic phenomenon. A system model to describe this phenomenon is characterized and developed… CONTINUE READING
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