Electric Institutions Use Rare Earth Permanent Magnet Brushless Dc Motor Control System

High quality control of rare earth permanent magnet brushless DC motor is researched in this paper. Depend on the comprehensive analysis and study of the structure, principle, and exterior characteristic of the motor, through the methods of system modeling and digital simulation analysis, two kind of control device that work for the low voltage (LVDC) and the high voltage (HVDC) in avigation are researched respectively . Point to the control technique of close-loop speed stabilization at a limited adjustment speed range, we bring out the close-loop speed control method that using the rotor position sensor indirectly measure the speed of the motor. At the same time, we mainly design the hardware and the software of the two control systems. The high quality singlechip of AT89C2051 and AT89C51 are used as the main microprocessor of the control system. Using digital method achieved the speed adjustment and the close-loop speed control which ensure the accuracy of speed adjustment and the speed stability at a definite speed range. As well as, through the optimal design and the combine of hardware and software, implement the miniaturization of the controller, improve the reliability of the controller, and decrease the volume and weight of the controller.It can be seen from the experimental result that the motor' s performance is excellent. The speed can be adjusted incessantly at the required speed range. The motor also can be kept at the same speed even when the load is three times of the rated load. Moreover, the universal of this controller is strong, and the heat dissipation is good.