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CORE LOSS TESTING

Core loss testing predicts a motor's reliability and operating cost following repair.  The function of a core loss test is to determine whether a motor has damaged core iron. Damage could include shorts between laminations of the stator, rotor, armature or field coils as well as electrical arcing.

A core loss test is a vital step when rewinding motors. A core loss test should be performed before the windings are removed to detect any damage to the core. After the windings are removed, the core should be retested to verify that it was not damaged during removal of the old winding.

It is possible for a motor to run with core damage, however the efficiency and lifespan of the motor will be significantly reduced. The motor will consume more power to operate at normal levels and it will cause the motor to generate more heat. Heat will in turn will reduce the lifespan of the motor and increase operating and maintenance costs.