Research Of Control System Of BLDCM Based On DSP

With the development of power electronics technology and ceaseless advance of permanent magnet material, Brushless DC motor (BLDCM) is more and more attention in the field of high performance motion control. BLDCM has been widely used in the various fields of the national economy because this motor not only has the merit of the DC motor for high efficiency, good performance and no excitation loss etc. but also has the merit of the AC induction motor for reliable operation, simple structure and easy maintenance etc.On the basis of the summary for developments and applications of BLDCM control system, the thesis introduces the structure, running principle, operational characteristics and mathematical model of BLDCM. It outlines BLDCM control strategy, and discusses the principles and methods of the control technology with no position sensor detection. Then the hardware and software design of the double closed loop control system is dissertated in detail. The controller of the hardware of the system is built by using the TMS320LF2407 as the microprocessor. It analyses the formation of PWM signals and designs the circuit of BEMF-zero-crossing, velocity and current detection. This system chooses syllogism jump-start motor. Besides, the drive circuit of the BLDCM is designed with IR2130. System software is modular in design methods, Including initialization, starting, commutation subroutine, ADC interrupt service procedures. Finally, it established a BLDCM control system simulation model by SIMULINK, and simulate to the case model.This thesis described the design options about BLDCM control system, It can get a good performance of Speed control; DSP technology enables the system has not only a high-precision, high reliability, also simplifies the system architecture.