Research On AC Servo System Based On DSP And Its Algorithm

Since 80’s of the twentieth Century, with the development of power electronic technology, modern control theory, microelectronic technology and the new high energy permanent magnetic material, servo control technology has made great progress. Especially the vector control technology allows people to effectively control high dynamic torque carried out on AC motor. Vector control technique greatly improves the control performance of AC servo system, making it almost be comparable with DC servo system. In addition, the development of microelectronics technology prompted the birth for motor control chip. Compared with the simulation of AC servo system, AC servo system based on DSP can realize the software algorithm, with unparalleled flexibility. Now the digital AC servo system has become the mainstream of the development direction of servo system. Under this background, this paper studied and designed AC servo system of permanent magnet synchronous motor (PMSM), witch based on DSP chip TMS320F2812.The object of this research is the permanent magnet synchronous motor (PMSM). Firstly, this paper analyzes PMSM’s physical structure systematically, and then establishes the mathematical model of the PMSM. This paper also studies the vector control principle of motor, especially the space vector pulse width modulation technology (SVPWM).The third chapter of this paper gives a design and implementation of servo system of permanent magnet synchronous motor, and puts forward the design of position controller by combining sliding mode control with fuzzy control. In the simulation environment of MATLAB/Simulink, the paper established the mathematical model of PMSM servo system. At first, the tracking performance of step signal and sine signal was tested. Then under different parameters and different interference conditions, the robustness of the system was tested. Finally fuzzy sliding mode control and conventional sliding mode control are compared by giving sine signal. The simulation results show that, the fuzzy sliding mode position controller improves the system for the disturbance and parameter perturbation robustness. Compared with the conventional sliding mode strategy, fuzzy sliding mode control strategy improves the anti-interference performance of the system.At last, this dissertation designed the PMSM servo system hardware circuit and software programmed based on DSP chip TMS320F2812.