Using a six fault zone approach for predictive maintenance on motors

A comprehensive analysis of motor health may be accomplished by combining online and offline test results into fault zones. These fault zones are Power Quality, Power Circuit, Stator, Insulation, Rotor, and Air Gap. Power Quality focuses on the quality of the voltage and current. Power Circuit focuses on the power circuit supplying power to the motor. The Stator Fault Zone focuses on the turn-to- turn insulation and internal coil connections. The Insulation Fault Zone refers to the winding to ground insulation. The Rotor Fault Zone refers to the health of the rotor cage and laminations. The Air Gap Fault Zone refers to the quality of the air gap between the rotor and the stator. Each fault zone should be analyzed to accurately assess the overall health of a motor. This paper will provide a brief introduction to a six fault zone approach for predictive maintenance on motors.