Importance of using insulated bearings for an efficient output

Many leading bearings manufacturers agree to the fact that the stray currents can cause even more damage
to the rotating parts, especially, in frequency driven motors. Though there are a number of solutions to avoid bitter damages to the machine, the most important of them all is using best insulated bearings.

 
Though these kinds of bearings are not used frequently in smaller motors, as they are a bit expensive, one should remember that stray currents may cause damage even in smaller motors with rating as low as 1000-2000v. Hence, it is always beneficial to use insulation coated bearing (or hybrid ceramic ball bearing), to avoid stray currents, irrespective of the capacity of the motor.