The Design And Simulation Research Of AC PMSM Servo System

This thesis particularly described the design of full digital AC servo system based on the PMSM(Permanent Magnet Synchronous Motor). With discussing the difference among several control strategies and analyzing mathematical model of PMSM, the id = 0 vector control for the SPMSM had been chosen to be the strategy of this servo system. The theory of SVPWM and the ways of locating the PMSM's rotor pole had been presented in this thesis. The establishing of the three loops servo system of PMSM which is based on the id = 0 vector control by use of the Saber Designer had also been introduced.The design of three loops servo system's controllers was the key point of this thesis. With analyzing the function requirement of three loops servo system, as for the current loop, the author adopted PI controller to ensure the performance of speediness and anti-disturbance; Considering the performance criterion of the velocity controller such as overshoot, regulating time, disturbance and precision, and the advantages and disadvantages of several kinds of controllers;As for the position loop,we chose the proportion and feedforward controller to satisfy the performance criterion of the locating precision , tracking precision and the range of overshoot. Then by the use of Saber Designer, we proved the arithmetic of controllers that we finally determined to be right.On the basis of the analysis of the theory and result of simulation, we designed the hardware and software of the full digital AC servo system. The hardware of the servo system could be divided into two parts, the first was the control circuit part and the other was the power circuit part. And the design of the galvanometry and photoelectric-encoder was the key point,While the content of software described the key design method and the flowchart of the software designing. The last paragraph of this thesis referred to the experiments of three loops of the servo system, the results of the experiment proved that the performance of the control system was satisfying, and validated the strategy that we had designed.