Demagnetization is an inevitable problem in the application of permanent magnet motors. A netizen asked a question: Will permanent magnet motors lose magnetism after long-term use? In response to this question, we have a brief exchange with everyone.

 

The permanent magnets in permanent magnet motors have poor thermal stability. If the design experience is insufficient or the application is improper, the magnetic properties of the permanent magnets may decrease. In the mild case, the motor performance will deteriorate, and in severe cases, the motor cannot operate.

Temperature and current are key factors affecting the performance of permanent magnets. High operating environment temperature and high motor temperature are both relatively sensitive factors; in addition, large motor current is also a problem that leads to weakened magnetic properties.

There are two situations of demagnetization during motor operation, one is reversible and the other is irreversible. This mainly involves the recovery line of the permanent magnet. When the motor is working under load, the performance of the permanent magnet will change to varying degrees, and its performance will recover to varying degrees after the motor is unloaded. There are parameter indicators of the recovery line in the performance description of the permanent magnet.