Shenzhen air compressor factory teaches you how to judge motor demagnetization and Solutions
Publisher: Administrator Date：2021-03-04
The permanent magnet motors produced by enterprises on the market are uneven. If the selection is not appropriate, it may cause the risk of motor loss and increase the cost of maintenance. Then how to choose maintenance? Shenzhen air compressor manufacturer will give you a clear idea solution.
In recent years, permanent magnet variable frequency screw air compressors have been highly efficient and stable. Energy-saving and power-saving, and many other features are trusted and used by users, and a large amount of demand has made the air compressor industry more and more developed. Everyone knows that the permanent magnet variable frequency motor loses its main components. If the motor loses its magnetization, it will cause The motor cannot be used, the cost of wastage, and the cost of maintenance are higher. How to judge the loss of magnetism? If the current of the machine increases for a period of time, it will report that the inverter is overloaded. The prerequisite is to confirm that the model of the inverter is correct, and then confirm whether the parameters have been changed. If there is no problem with both, then pass the motor Judging by the operation mode, check the machine head and the motor separately, and determine the frequency for no-load operation. At this time, the output voltage is lower than 50HZ on the motor nameplate, and it can be determined that the motor is demagnetized. This also takes a certain amount of time, usually several From months to one year, the reasons for the demagnetization of the motor are: 1. The motor's cooling fan is abnormal, causing the motor to be high temperature 2. The motor is not equipped with a temperature protection device 3. The ambient temperature is too high 4. The motor design is unreasonable.
How to solve this situation? The solution given by the Shenzhen air compressor manufacturer: Confirm the model parameters of the motor before buying. Demagnetization has a great relationship with the power of the motor. If you choose the right one, you can prevent delaying demagnetization. 2. The temperature of the motor should not be too high, too high will cause the demagnetization to accelerate, which requires additional heat dissipation conditions for the air compressor. 3 is that the selected motor power must have a certain margin. According to the actual situation, it can be about 1% or 20% higher. 4 is to avoid frequent starting and switching of the machine, because there will be multiple vibrations in the process, which will also affect Demagnetization has an effect.