The issue of demagnetization in permanent magnet synchronous motors is something that everyone should know to some extent, and it is one of the more troublesome problems for many people. So what causes the demagnetization of permanent magnet synchronous motors? If we want to solve the demagnetization problem, we first need to understand the reasons. Below, we will introduce what causes the demagnetization problem in permanent magnet synchronous motors, with detailed content as follows:

Firstly: The reason for demagnetization is the magnetic material used in permanent magnet synchronous motors. For example, irreversible demagnetization occurs when the temperature exceeds a certain degree, with 150 degrees being a good example.

Secondly: The design of the motor is unreasonable. You may ask what the relationship between design and demagnetization is. The motor's design did not take into account the operating environment, leading to the actual working point being below the inflection point of the demagnetization curve or the internal temperature of the motor exceeding 150°C, resulting in irreversible demagnetization.

Thirdly: Long-term overload operation. Long-term overload operation of the motor can lead to excessive temperature rise, exceeding the heat resistance temperature of the material, thus causing irreversible demagnetization.

Fourthly: Incorrect usage environment. For example, the motor should not be used in high temperatures, but the actual operating environment has excessively high temperatures or severe vibrations, leading to demagnetization of the motor's magnetic steel.

Fifthly: Cooling failure of the permanent magnet motor, leading to the permanent magnet motor operating at high temperatures for a long time. Inadequate cooling causes the temperature to rise beyond what the permanent magnet material can withstand, resulting in irreversible demagnetization.

Basically, these are the reasons that lead to this issue. Analyzing the above problems, we can conclude that the demagnetization of permanent magnet motors is mainly due to the temperature exceeding the range that the permanent magnet material can withstand, leading to demagnetization issues. Therefore, addressing the cooling problem of the magnetic material is very important, as it helps us solve the demagnetization problem of permanent magnet synchronous motors.