The temperature rise of an electric motor is a normal part of its operation, but when the temperature exceeds the safe operating temperature designed for the motor, it can cause damage. Different types of motors have different safe operating temperature ranges, but generally, the insulation material of the motor is the key factor that determines its temperature limit.
For most industrial motors, the insulation classes are usually divided into the following:
When the temperature of the motor exceeds the maximum temperature limit of its insulation class, the insulation material may begin to degrade, which can lead to insulation failure and subsequently cause motor failure or burnout.
In addition to the insulation class, the working environment of the motor, load conditions, and the efficiency of the cooling system also affect the safe operating temperature of the motor. Therefore, to ensure the safety of the motor and extend its service life, it is recommended to follow the manufacturer's guidance and regularly inspect and maintain the motor to ensure it operates within the specified temperature range. If the motor temperature rises abnormally, it should be stopped immediately and a fault investigation should be conducted.