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Motor Temperature Rise

09 September 2025

Technical Information for Motor-Gearbox Combinations, ⑤, Understanding Motor Temperature Rise

The motor will heat up when it is powered on. The temperature of the motor's surface will continue to rise until it is stable. Within 3 hours after the temperature is stable, the temperature is allowed to change within 2 degrees Celsius.The part at which temperature rises above the ambient air temperature (ambient temperature) is called the temperature rises. The unit of temperature rises is kelvin (K). The temperature rise is the value that higher than the ambient temperature.

Rated temperature rises: refers to when the environmental temperature is under , the maximum allowable temperature rise of the motor winding. It depends on the winding insulation grade.

  • Calculation formula: θ=T2-T1

θ——Temperature rises

T1——Winding temperature in actual cooling condition (that is ambient temperature, room temperature not exceeding 40℃)

T2——Winding temperature in heating condition

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