The temperature rise is a very important performance indicator for the motor, and the temperature rise is the temperature difference between the three-phase asynchronous motor and the environment, which is caused by the motor heating. In operation, the iron core of the motor in the alternating magnetic field will produce iron loss, the winding will produce copper loss, and other stray loss. These will increase the temperature of the motor.

       There are seven heat resistance grades of insulating materials, which are marked with the limit operating temperature, under normal circumstances, the ambient temperature and temperature rise will not exceed the design value for a long time, and the life of the motor is generally in15-20But if the operating temperature exceeds the limit working temperature of the material for a long time, then the aging of the insulation will be intensified, and the life will be greatly reduced, so inThree-phase asynchronous motorDuring operation, the ambient temperature and temperature rise are one of the main factors affecting the life.

       On the other hand, when the three-phase asynchronous motor dissipates heat, the equilibrium state is reached when the heat is equal to the heat dissipation, and the temperature is no longer rising and stable at a level. When the heat increases or the heat dissipation decreases, the balance will be destroyed, so that the temperature continues to rise, the temperature difference should be expanded, and the heat dissipation should be increased to reach a new balance at another higher temperature. However, the temperature difference at this time, that is, the temperature rise, has increased than before, so the temperature rise is an important indicator in the design and operation of the motor, marking the degree of heat of the motor.

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