the key technology of brushless dc motor is characterized by: 1, the electronic control for dc motor running properties, like better controllability, wide speed range. 2, need rotor position feedback information and electronic polyphase inverter drive. 3, is essentially a ac motor, with no spark of brush and commutator, wear problems, it can work in high speed, high reliability can be obtained, long working life, need not often maintenance. 4, high power factor brushless dc motor (BLDCM), the rotor lossless and fever, have higher efficiency: the data contrast, 7. 5 kw asynchronous motor efficiency is 86. Efficiency of 4%, with the capacity of the brushless dc motor is up to 92. 4%. 5, must have electronic control parts, the total cost is higher than dc motor. Relative to a motor controller, the controller of brushless dc motor continuous working time will be longer, because of the brushless motor controller is not need to change the carbon brush,Controller of carbon brush and brush motor in use after a period of time will wear, need to change to normal use. So the two large difference in the continuous working time. But beware: the length of the continuous working time is not on behalf of the service life of the motor controller! Theory of continuous working time is long, life is not necessarily the motor controller is long! Whether brushless motor controller or a brush motor controller, the service life of it depends on the main components inside the motor controller is the weakest part of the normal use of time. For example, if the winding brushless motor controller manufacturing process quality, poor quality of materials, rough, so the first bad motor controller is brushless motor controller, rather than a brush motor controller.
