Considerations in Electric Motor Storage

Locating your spare motors is of critical importance. Motor spares are an investment in space and a prevention of production downtime. If properly stored, these spares can be as reliable as the original motor.

1. Ensure that the motors are stored in an area with temperatures above dew point. This will ensure that bearing components and the shaft do not rust, nor damage to the insulation system;
2. The shaft must be rotated periodically to reduce false brinelling. This should be performed quarterly. One method is to place a two-color tag on the motors with one color facing out for one quarter and the other for the alternate quarters. Turn the shaft then turn the card;
3. The motors must be stored in an area that is exposed to low vibration. This means, in an area of low truck, heavy equipment or operating machinery. This will reduce the opportunity for false brinelling;
4. The machined surfaces, including shaft, should have a coating of masking grease or oil added. If there is the opportunity for the motor to be exposed to dew point issues, then space heaters may have to be installed;
5. Periodic insulation resistance or MCA tests should be performed to monitor for degradation of the insulation system.


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