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Protecting VFD Driven Motors from Bearing Currents

Website URL: http://www.vibration.org/Presentation/Dec%202011/AEGIS%20Presentation%20-%20%20Preventing%20Bearing%20Fluting%20Failure%20in%20VFD%20Driven%20Motors-ASHRAE.pdf

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NEMA recommended to use either ceramic bearings or shaft grounding. ... Induced by the magnetic flux imbalance around the motor shaft from the stator