How to prevent demagnetization of brushless DC motors

Update:02-04-2022
Summary:

Reasons for demagnetization of brushless DC motors: An […]

Reasons for demagnetization of brushless DC motors:

An important indicator of the performance of the brushless DC motor is the high temperature resistance level. If it exceeds its temperature resistance level, its magnetic flux density will drop sharply. High temperature resistance grades can be divided into: N series, resistant to more than 80 degrees; H series, resistant to 120 degrees; SH series, resistant to more than 150 degrees.

1. The cooling fan of the motor is abnormal, resulting in the high temperature of the motor

2. The motor is not provided with a temperature protection device

3. The ambient temperature is too high

4. The motor design is unreasonable

How do brushless DC motor manufacturers prevent demagnetization?

1. Correct selection of DC brushless motor power

Demagnetization is related to the power selection of the motor. Correct selection of the power of a BLDC motor can prevent or delay demagnetization. The main reason for the demagnetization of the synchronous motor is that the temperature is too high, and the overload is the main reason for the high temperature.

Therefore, a certain margin should be left when selecting the motor power. According to the actual situation of the load, generally about 20% is more appropriate.

2. Avoid heavy load starting and frequent starting.

-- washing machine motors manufacturers

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