Why an increase in motor operating temperature doesn´t result in higher torque output

Contrary to popular opinion, increasing a motor´s operating temperature doesn´t always result in higher torque output from the motor. In this paper we show graphically how each motor´s temperature dependent electrical resistance inhibits the increase in motor torque output with increased operating temperature. For all permanent magnet motors we also show that thermal demagnetization of the motor´s magnets further inhibits motor torque output such that motors using certain magnet materials actually output higher torque at a lower operating temperature.