Research On The Digital Servo System For The Permanent Magnet Synchronous Motor

High performance AC servo systems, widely used in various areas, are demanded with the development of modern industrialization. AC servo systems have advantages over DC servo systems, so it is very important to develop high performance and high reliability AC servo control systems.In this paper, the control method of the permanent magnet synchronous motor(PMSM) and its mathematic model are fully studied. The working principles of PMSM and close-loop control methods of PMSM current,speed and position are detailly discussed based on the PMSM mathematical models in the different reference frames. Then the position servo system is simulated by MATLAB/SIMULINK. The control method is proved correct by the simulation result. Moreover the thesis presents a high-frequency signal injection method to observe rotor position based on Permanent Magnet Synchronous Motor models. The simulation results show it is adjusting and effective to estimate rotor position.It's proved successful on PMSM's servo control based on the Digital Signal Processor(DSP) chip TMS320F2812, including current,speed and position control. The experimental results prove that this servo system has very wide range of regulating speed and has good dynamic and static behaviors .Moreover some functions of servo system are accomplished. So, the servo system can meet the demand of high control performance.