Preventing Damage to Motor Bearings

Oh, William
April 2007
Heating/Piping/Air Conditioning Engineering;Apr2007, Vol. 79 Issue 4, p46
The article presents a guideline on preventing electrical destruction to motor bearings of variable frequency drives (VFD). The shaft current induced into the drives must be diverted from the bearings by insulation or an alternate path to ground. Insulating material, usually a nonconductive resin or ceramic layer, isolates bearings and prevents shaft current from discharging. Conductive grease can also be applied to bearings, which provides a lower-impedance path.


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