Research Of PMSM Vector Control System Based On Sliding Mode Obsrever

In the field of motor drive, since high efficiency and energy-saving advantages,permanent magnet synchronous motor (PMSM) has gradually become the core drivingpart of AC drive system. The key to achieve high-performance control of PMSM is todetect the rotor position and speed of PMSM accurately. In traditional AC drive system,the rotor position and speed of motor is generally detected by sensor. However, themechanical sensor detecting device requires ideal environment, which not onlyincreases the system cost but also limits the application of PMSM. Therefore, theresearch of sensor-less control strategy of PMSM becomes one of hotspots amongdomestic and foreign scholars.In this paper, a closed-loop vector control system of PMSM was built based on themathematical models in different coordinate systems and vector control theory. Besides,the trigger pulse drive inverter module was generated to control PMSM, using spacevector pulse width modulation. Afterwards, in the speed closed-loop feedback loop ofthe entire control system, the current sliding mode observer was designed based on thesliding mode variable structure control theory and the selected mathematical model oftwo-phase stationary coordinate of PMSM system. As to the buffeting of the slidingmode variable structure control, by using the saturation function instead of theswitching function in the traditional sliding mode observer, the angular position andspeed of PMSM could be estimated, achieving the PMSM sensor-less closed-loopvector control. Meanwhile, the simulation model of the PMSM vector control systembased on the sliding mode observer was built on the MATLAB/Simulink simulationplatform. The results of the entire control system simulation verified the feasibility ofthe sliding mode observer.After the entire vector control system simulation analysis, based on TI motorcontrol dedicated high-speed digital signal processor TMS320F2812, the system controlpanel was designed, then the programs was written and the hardware experimentalplatform for experimental verification of the control system was built either. Byanalyzing the entire system, the experiment results was gained, showing that the improved sliding mode observer could estimate the rotor position and speed of themotor effectively, moreover, the control system owe better robustness and feasibility.