Permanent magnet brushless DC motor applications

(1) If the product is not specified, under normal circumstances (such as AlNiCo permanent magnet DC motor or ferrite permanent magnet DC motor) permanent magnet DC motor is not allowed to reverse braking operation at rated voltage, otherwise it will cause Demagnetization of the permanent magnet; if it is necessary to do this mode of operation, to increase the current limiting resistor to limit the current is too large.
(2) Perform a preliminary inspection of the motor according to the following steps:
First, check the appearance of the motor: there should be no scratches, bumps, and coating off; then turn the shaft, it should be able to rotate flexibly without obvious jamming. Check that the wiring of the motor is secure and run on power. There should be no friction in the rotation of the motor, the most prominent being the bearing friction. After the bearing wears out, it will give off an abnormal sound and there will be a local overheating temperature rise.
(3) Pay attention to permanent magnet demagnetization caused by excessive current, temperature change, and open magnetic circuit during assembly and disassembly. Especially for AlNiCo permanent magnet motors, the permanent magnetic circuit must be magnetically short-circuit protected when disassembling, otherwise Additional magnetization after demagnetization.