Design On The Regulator Of 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.This thesis regarded PMSM (permanent magnet synchronous motor) as the research object, advantages and disadvantages of different control strategy of the servo system were researched in detail. The i_d=0 vector control for the PMSM had been chosen to be the strategy of this servo system. SVPWM has clear physical conception, simple arithmetic and high utilization of DC voltage; furthermore, it is easy to realize digitization. So it is one of the most common methods in AC motor control.Herein the focal point of the thesis is to construct the closed loop of servo system and simulate the regulator designed utilizing Saber Designer software. First of all, the thesis has analyzed the performance requirements for the servo system and structural characteristics of the regulator. The current loop is demanded to respond quickly. The speed loop is the key point in the speed regulation system. We demand that it not only responds quickly, but also the steady state has high precision. At the same time, the position loop must satisfy the performance criterion of the locating precision, tracking precision and the range of overshoot. The current loop adopted traditional PI regulator; in the design of the speed loop, simulation researches were done with different velocity of PMSM using IP and PI regulator respectively. And then the thesis summarized the speed ranges of two kinds of regulators most suitable to. On the basis of traditional regulator, the speed regulator was improved. The thesis summarized the influence law that the parameter changed through the simulation experiments. In order to realize the optimization of systematic function, the regulator adopted alterative parameters as to different velocity of the motor. As for the position loop, we chose proportion and feed forward controller to satisfy the performance criterion of the locating precision, tracking precision and the range of overshoot. On the base of analysis in the theory and simulation experiments, the thesis verified the regulators that were designed. The experimental results proved the regulators designed reached the ideal control result finally.