---
title: Motor Temperature Rise - EURARI
description: Motor temperature rise explained: causes, measurement methods, allowable limits by insulation class and cooling design tips. EURARI technical guide.
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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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