What is the allowable temperature rise of an ordinary three-phase asynchronous motor

Update:28 Sep 2021

The three-phase asynchronous motor is the most widely used power supply equipment in domestic equipment. The operating temperature of the three-phase asynchronous motor is a key factor affecting the service life of the motor.

Each three-phase asynchronous motor leaves the factory, and the motor manufacturer generally determines the temperature rise of the motor during operation.

What is the allowable temperature rise of a three-phase asynchronous motor?
When a three-phase asynchronous motor is running with a load, the motor manufacturer starts from just exerting its influence, and the load, that is, the larger the output power, the better (if you don't think about the strength of the machine). However, the greater the output power and the greater the power loss, the higher the temperature.

However, the thinnest temperature-resistant object in a three-phase asynchronous motor is insulating material, such as enameled wire. There is a limit to the temperature resistance of the insulating material. This limit is the temperature rise allowed by the three-phase asynchronous motor. Because the physical, chemical, mechanical, electrical and other aspects of the insulating material are unchanged, the service life is generally about 20 Years, above this limit, the life of the insulating material will be shortened drastically, or even burned.

The utilization temperature of some three-phase asynchronous motors varies with time and location. Motor manufacturers use 40 degrees Celsius as my country's standard temperature when designing the motor. Therefore, the allowable temperature of the insulating material or motor minus 40 degrees Celsius is the allowable temperature rise, and the allowable temperature of different insulating materials is different.

 

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