A Study Of Control System Of BLDC Motor Based On DSP Controller

It is the study focus of BLDC motor applications how to reduce torque ripples and current ripples. According to this focus, a solution of intelligent control system of BLDC(Brushless DC) motor using ADI's ADMCF340 is presented in this paper. The control system includes three closed loops, which are position loop, current loop and speed loop.At the beginning, we illustrate the fundamental components, the basic working principle, and mathematical model of PM-BLDCM. Based on an in-depth study of specific chips BLDC motor controller, development the numeric intelligent controller based on DSP. And emphasized on analyzing the reason of causing voltaic pulsatile and torque pulsatile, research the method of voltaic control and torque control. Based on upper research, using PID arithmetic ameliorate the control system. Tuning the three parameters K_p, K_i and K_d on line. Some control difficulties due to the nonlinearity and model uncertainty of BLDC motorize recovered effectively. Tune the three parameters of PID controller to ameliorate the performance of control system. Discussing the future of PID controller.ADMCF340 DSP controller, which is optimized for motor control, is used to digitalize the control system. This DSP controller is designed with special peripherals for motor control. Its operation speed is very fast. In this paper, hardware design scheme is given. Some important functions blocks of data treat board and power drive board are introduced in detail. Programs are written in Assembly language and are debugged successfully.