Brushless DC motor motor body and drive is a typical mechatronic products. The motor stator winding is very similar to a symmetrical three-phase star-connected three-phase asynchronous motor. In a motor with a rotor of magnetized permanent magnets, a position sensor is built into the motor in order to detect the polarity of the rotor. The driver is composed of power electronics and integrated circuits, etc. Its functions are: to accept motor start, stop, and brake signals to control motor start, stop, and brake; to accept position sensor signals and torsion signals to be used to control the inverse change of the bridge power tubes off so as to be in continuous torque; to accept speed commands and speed feedback signals to be used for controlling and adjusting the speed; to provide protection and display. Brushless DC motor based on PCA run, it will not be heavy synchronous motor frequency conversion speed control rotor plus start winding oscillation, the loss of the load sudden change step. Permanent magnet brushless DC motors are small capacity, high energy product of rare earth neodymium iron boron (Nd-Fe-B) material is used. As a result, the volume of the rare earth permanent magnet brushless motor is reduced in frame size compared to a three-phase asynchronous motor of the same capacity. Nearly three decades of research on frequency control of asynchronous motors, in the final analysis, to find a way to control the asynchronous motor torque, rare earth permanent magnet brushless DC motors is combined with its wide range of fast speed, small size, high efficiency advantage is obvious, speed control field and steady-state speed error is small. Brushless DC motor DC brush motor characteristics, but also the frequency change device, they are called inverter DC, BLDC DC brushless motor operating efficiency, low-speed torque, high speed, precision and other internationally accepted terms than any frequency control technology is better, so this is worthy of the industry's attention. This product has been produced more than 55kW 400KW can be designed to solve the energy saving and high performance industry needs of the drive.