Control System Research Of BLDCM Based On The DSP

The operating principle of PM BLDCM(Permanent-Magnet Brushless DC Motor) is analysed in this paper and the timing system of it is implemented as the experiment platform. In hardware design,the DSP TMS320LF2407 is adopted as the microprocessor and the IPM(intelligent power module) as invertor ,which is constructed compactly and works well.The software of the system is designed properly ,in which little system resources is occupied, many functions are realised such as PWM output, signal sample of current and speed loop, and normal-reverse transfer. The double-loops system are adopted in the control system based on the DSP, hardware designs are completed ,including the three-phase inverter,the driving cirruit,the protection circuit,the position detecting circuit,the current detecting circuit and the periphery circuit of DSP.The software is designed to realize the control strategy,which includes the main,A/D sampling,current regulation,speed calculation,speed regulation and capture interruption subroutine.At last ,the experimental research is implemented on this BLDCM control system, and the waves of current and speed is given,the result is reasonable,which indicates the reliability of the design. In conclusion, the control scheme is proved to be feasible and reliable in this paper and a high performance is verified.