The High-performance Control Of PMSM Based On DSP

PMSM has been paid extensive attention by the scholars who are engaged in doing research about motor drive system since the end of the 70s because PMSM has a small size,high efficiency,great power density and so on.It can be foreseen that with the reduce of the permanent magnet material's price and motor manufacturing price, with the progress of power electronic devices and high-speed microprocessor,with the continuous improvement of theoretical research and practical application of drive systems,PMSM and its drive system will have further development and may take the place of general power excitation motor and control system gradually in some fields.Based on widely reading of references and understanding of PMSM operational principle,the basic structure and mathematical models in the different coordinates of PMSM were analyzed.Besides,Vector control(VC) and direct torque control(DTC) were studied.According to the disadvantages of DTC such as large torque and flux linkage ripples and so on,PMSM DTC based on SVPWM was proposed. Matlab/Simulink was used to do simulation experiments of these control methods,and the feasibility of these control methods was verified.On the basis of the simulation experiments,the experimental platform based on the high-speed digital signal processor TMS320C2812 and intelligent power module (IPM)was established.The electrical circuits such as power supply,sampling, protection and drive circuits and the principles of these circuits were introduced separately from the perspective of hardware and software.Moreover,the software structure and flow of DTC was described in detail,realizing full digital control of DTC system.The experiment of three-phase PMSM DTC system was also done in this platform,getting the experimental results which were consistent with the simulation results.