the following content for the motor controller for permanent magnet brushless dc motor controller demagnetization causes and prevention of permanent magnet brushless dc motor controller is the most important parts is magnetic steel, the magnet steel is the most afraid of is the high temperature, in the condition of high temperature for a long time will gradually demagnetization, the higher the temperature, the greater the risk that the demagnetization. Once demagnetization speed is amazing, and part of the demagnetization after the current of permanent magnet brushless dc motor controller will continue to increase, rising energy consumption, allows the user to rising cost of electricity, and the possibility of motor controller 'strike at any time. Permanent magnet brushless dc motor controller once excitation-loss, basically can only choose to replace the motor controller, the maintenance cost is a lot of, how to judge the excitation-loss permanent magnet motor controller? Demagnetization permanent magnet brushless dc motor controller for permanent magnet brushless dc motor controller performance is an important index is high temperature resistant level, more than its heat resistance level, the magnetic flux density will fell sharply. High temperature resistant level can be divided into: N series, more than 80 degrees; H series, resistant to 120 degrees; SH series, over 150 degrees. 1, the cooling fan motor controller is unusual, lead to high 2, motor control motor controller is not set temperature protection device 3, environment temperature 4, motor controller design is not reasonable to prevent demagnetization of the permanent magnet brushless dc motor controller? 1, the correct selection of permanent magnet brushless dc motor controller power demagnetization and permanent magnet motor controller associated the power of choice. The power of correct selection of permanent magnet brushless dc motor controller can prevent or delay the demagnetization. Permanent magnet synchronous motor controller demagnetization of the main reason is the temperature too high, overload is the main reason for the high temperature. Therefore, when choosing power permanent magnet motor controller should have a certain margin, according to the actual situation of the load, average about 20% more appropriate. 2, avoid overloading starting and frequent starting.
