(Electrical Discharge Machining) EDM, also known as Fluting, is a condition which often occurs in AC motors with Variable Frequency Drives (VFD) and DC motors. Fluting is becoming more common due to the increase in VFD installations.
REDLINE PdM analysts can easily identify this fault using advanced vibration analysis as well as shaft to ground testing.
For more information on EDM Fluting read this paper produced by ABB Industries - Currents In Modern AC Drive Systems.pdf
