The use of variable-frequency drives (VFDs) to control ac motors has increased dramatically in recent years: on power generators, gas turbines, wind turbine generators, ac traction and break motors, ...

All wind turbines are large but the Repower 5M wind turbine is huge. Manufactured by Repower Systems AG from Hamburg, the 5M stands 120 meters above the ground and produces 5 MW of electrical power.

Electro Static Technology: Shaft Grounding Brush By safely channeling harmful shaft current away from the motor bearings to ground, the AEGIS SGRâ„¢ Conductive MicroFiberâ„¢ shaft grounding brush ...

More telling is tracking induced shaft currents due to common-mode voltages. These can be measured by touching an oscilloscope probe to the shaft while the motor is running. The voltages repeatedly ...