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Insulated bearing in motor prevent electromagnetic corrosion

127 Published by admin Apr 01,2024

Insulated bearing in motor is used to prevent the circulating current through the motor bearing. The circulating bearing current can damage the bearing. When we run an induction motor with a variable frequency drive, the motor is apt to fail due to circulating bearing failure.

In large-rate motors and alternators, induced shaft voltage causes a flow of circulating current from the motor shaft to the outer race, rollers, or balls of the bearing. The circulating current can damage the bearing. That is why we ground the motor shaft through the carbon brush so that the circulating current finds its path to the ground and does not pass through the bearing. The same phenomenon happens with an induction motor . so, the insulated bearing in motor is very impprtant.

Electric motors, generators and associated equipment are at risk when an electric current passes through their bearings. This can damage the contact surfaces of rolling elements and raceways in the bearings (electrical erosion) and rapidly degrade the grease. An additional risk in electric motors and generators comes from high frequency currents caused by the inherent stray capacitance. The risk of damage increases where the application uses a frequency converter. Insulated bearing in motor prevent electromagnetic corrosion.

Insulated bearing in motor are designed to prevent electric current from passing through the bearing. The external surfaces of either their inner or outer ring are coated with an insulating aluminium oxide layer, by applying a sophisticated plasma-spray process for an outstanding quality finish. The solutions are very cost-effective compared with other insulation methods.