Research On PMSM Servo System Based On DSP

In recent years, with the various development of new materials, electromechanical integration, power electronics - and computer control theories, AC servo systems have achieved a great progress. Among them, the PMSM (Permanent Magnet Synchronous Motor) servo system has exploited the most wide application field, which has become the main stream of AC servo system. In addition, because of the appearance of DSP for motor driver, the AC servo system has further been developed in the digital control field. Under this technical background, the Permanent Magnet Synchronous Motor servo system based on DSP of TMS320F2812 is researched and designed in this dissertation.Firstly, the structure and the mathematic model of PMSM are analyzed in the dissertation, and the vector control theory of AC servo system is studied, and especially the principle of Space Vector Pulse Width Modulation (SVPWM) as emphases is researched.Secondly, the scheme of PMSM servo system is designed and a new PI controller is proposed. Based on the simulation environment of MATLAB, a current hysteresis tracking control method is proposed and realized, which is in contrast and analyzed with SVPWM method for the system performance under different position (angle) references. The simulation results prove that the fluctuation of current and electromagnetic torque can be decreased using SVPWM method, and the dynamic and static performance of this system can be improved by SVPWM method. For the position controller which adopts the new PI controller, while the position reference is changed in large range, the overshoot is restrained, and the new PI controller can make the servo system get satisfying effect which has fast dynamic response and high accuracy in steady state.Finally, the hardware circuit and software programme of PMSM servo system based on DSP of TMS320F2812 are researched and designed. Then the hardware and software of the whole system are debugged, and the experiment results have proved the correctness and validity of the designed system.