Why do I need to use insulated bearings at the non-driven end of the motor?

The motor should be rotated with insulated bearings at the non-driven end because once the motor is rotated without insulated bearings, shaft voltage and shaft current will be generated, and the bearing current will cause high temperature in the bearings, which will seriously damage the bearings. Why do some motors need insulated bearings on the non-driven side? Here is an explanation for you

1、First of all, for safety, at high frequency, the induction current of the rotor will be very high, to prevent the motor shaft current.

2、if you do not use electrically insulated bearings, the current will flow through the bearing to form a circuit, the bearing is easy to heat up or be electric shock fly, and thus be damaged.

3、frequency conversion speed control system in the high-frequency shaft current on the bearing of the most significant feature of the electric corrosion is in the inner and outer ring of the motor bearing, ball on the production of friction plate type of dense grooves. So one end of the motor must be electrically insulated from the bearings.

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