Any electrical product, including the 3 phase motor, will heat up to varying degrees, but under normal circumstances, heat and heat dissipation is a relatively balanced state, for motor products, the temperature rise index is used to characterize the heat level of the motor.

Among the performance indicators of the motor, a very important performance indicator is temperature rise, which represents the heating level of the motor winding and is closely related to the insulation performance of the motor. For the motor with higher temperature rise, the insulation material used in its winding should have a higher heat resistance grade, and the bearing system directly related to it must also meet the function of high temperature operation.

During the operation of the motor, with the change of the running time, the temperature of the motor winding has a process from low to high and then to stable. When the heat and heat dissipation reach a relative balance, the temperature of the motor winding will be maintained at a relatively unchanged level. The length of this time is directly related to the heat dissipation of the motor and the surrounding environment, when the ventilation and heat dissipation conditions are not good, the temperature rises quickly, otherwise, the winding will take longer to reach stability.

In the actual application process of the 3 phase induction motor, the motor winding from the normal temperature of the starting process to the relative stability of the temperature must go through a certain time; The motor user can check the temperature rise level of the winding according to the parameters in the product nameplate information. For occasions with high temperature rise requirements, the motor temperature rise will be dynamically monitored. For example, PT100 is a component commonly used in the dynamic test of motor temperature. When the difference between the two is relatively stable, as long as it does not exceed the insulation grade temperature requirements indicated in the motor nameplate, the reliability of the motor operation can be guaranteed.

In view of the reliability requirements of the motor operation, the motor operating environment has a greater impact on the temperature of the motor winding, and the motor application in the special operating environment should carry out the necessary communication with the motor supplier in the product ordering requirements, such as the plateau operating environment, the motor installation space is closed and unventilated environment, which requires the heat resistance of the motor winding to be higher.