Zheng Jigui

Modeling and simulation of speed loop control technology for permanent magnet synchronous motor servo system

Speed control loop is the intermediate link of the three control loops in the position servo system. The control method and technology of the speed control loop play an important role in the response of the whole system. This paper is based on the analysis of working principle of the permanent magnet synchronous motor, the principle of space vector control and the average equivalent principle of SVPWM algorithm. For the purpose of improving the speed control loop, precise PI control and angular position control are used to make permanent magnet synchronous motor operation characteristics excellent, though system modeling and simulation, system control parameter optimization.

Optimization of speed loop control technology for permanent magnet synchronous motor servo system

Permanent magnet synchronous motor servo control system includes three control loops: position, speed and current, however, the traditional control methods still cannot adapt to some occasions, such as, position servo of modern high precision and high frequency response. In this paper, we derived the mathematical model and the coordinate transformation that rely on the analysis of permanent magnet synchronous motor working principle and vector control principle. As for the decoupling problem of current loop based on d, q coordinate, this paper analyzed the vector decoupling control factors and their mutual influence, and then proposed decoupling control method. The paper also optimized the speed loop and position loop by speed loop control method with sliding mode variable structure, while adding feed forward controller for speed loop and achieving quite a comprehensive optimization for the three control loops. Finally, simulation results have verified the high feasibility of the proposed servo control method and strategy.