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Three-Phase Motor Tips: How To Evaluate Winding Temperatures

Maintenance Technology
Publication date: 
December 2015
Mike Howell, EASA Technical Support Specialist

Suspect a three-phase motor is running hot? If you’re right, the unit is either producing more heat than it’s designed for or dissipating less. With excess heat, the main concerns are typically the health of the bearing-lubrication and the winding-insulation system.

Before incurring the expense of pulling the motor, evaluate its winding temperature. This article explains how.