The paper introduced the design of the low speed Brushless DC Motor control system. Paper also design the procedure total diagram of the software which control the Brushless DC Motor. The experiment shows that the design of the motor, the speed response of the no-load start is fast, the overshoot is small, the speed fluctuation is small, has the good dynamic static characteristic, has certain application value. KEY WORDS: low speed; Brushless DC Motor; control system Introduction At present,

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... screw pump pumping unit is widely used in oil field production. It requires the drive motor to provide high torque, slow speed and smooth operation.Using the asynchronous motor, the screw pump is driven by decelerating mechanism, which is inefficient, noisy and large. Brushless dc motor has the advantages of high efficiency, high torque and smooth running. It is suitable for driving motor with screw pump type pumping.Furthermore, the low speed brushless dc motor can realize the direct drive of the pumping unit, which simplifies the transmission mechanism of the system, and avoids the series of problems brought by the reducer.In addition, the brushless dc motor needs to detect a lot of state quantity in operation, and the control is more complicated. It is not applicable to use single chip microcomputer for data processing and control.In recent years, many companies have launched high performance digital signal processors, such as TI company TMS320C24 and Motorola's DSP56F8xx series. It is very convenient to control the operation of brushless dc motor.With the control system of the digital signal processor, the data processing ability is strong, the operation speed is fast, the precision is high, and the application is more and more widely.