The Design And Realization Of Space Vector Control Of Permanent Magnet Synchronous Motor System

Since human beings enter into the era of electrification, more and more electric equipments appear in various aspects of our daily life. As an actuator, the motor is widely applied in industrial production. In fact, its sales have reached￥100billions in our country, and it keeps increasing by20percent in recent years. Because of the rapid development of science and technology, higher requirements on the accuracy and speed of motion control are required. As a consequence, a deep study about the motor structure and the control law is undertaken. Comparing to other kinds of motors, permanent magnet synchronous motor (PMSM) has an easier mechanism, higher efficiency and power factor and a smaller volume. Besides, the maintenance of PMSM is relatively convenient. As a consequence, it has been applied in many areas, and it is the mainstream of electrical motor.This dissertation is based on the project of permanent magnet synchronous motor servo system in our laboratory. This project consists of the construction of the PMSM platform and improvements of its functions. Circuit design and the research and choice of the power chip of the servo system have been done before. The present platform could operate well and it satisfies the experimental requirements of speed control. However, lots of work has to be done to make it performs sufficient satisfactory, such as some functional extensions. Thus some work is done on this aspect. Some research is done on the communication between the experimental platform and the computer. At present, the motor is controlled by digital signal processor (DSP) TMS320F2812. The limited pins of this chip cause it inconvenient to further expand the servo system. Complex programmable logic device (CPLD) is therefore used to expand the pins of DSP and some related work is done on circuit design and communication programs.PMSM is a complex system that there is coupling among inputs, and parameters are sensitive to the work environment. It’s hard to achieve an ideal control effect, making PMSM an ideal object to verify the effect of advanced control methods. Considering the operational principle of PMSM and the work environment, this dissertation makes an intensive study on some methods with strong anti-disturbance ability.The operational principle of PMSM is so complex that some simplification should be done during the modeling process, making it hard to describe the actual system accurately. Besides, there exists strong coupling in this system. As to this kind of system, which has a variant disturbance, the active disturbance rejection control method has some advantages. A first order disturbance rejection controller is designed for the speed loop in the double-loop vector control structure, and it is verified by an experiment. Because the first order disturbance rejection controller can not fully play the advantages of active disturbance rejection control, some improvements are made to the double-loop vector control structure. Then a modification is carried out to the double-loop vector control structure so as to make it applicable for the second order active disturbance rejection controlSliding-mode control can overcome many difficulties of PMSM control since it does not require an exact model as well, and it also has a high response speed and high disturbance rejection ability. Considering the chattering problem and the high fluctuation during steady state, some improvements are done to the traditional sliding controller. An exponential approaching law is designed, and to improve the tracking speed, the disturbance compensation technique is also applied. By this disturbance compensator, both the tracking speed and the ability of disturbance rejection are improved. An experiment demonstrates the proposed method.Disturbance observer could acquire real-time estimations of the inner and outer disturbances, making the controller based on disturbance observer with high robustness. Thus a motor speed controller is designed by combining the sliding-mode control and the disturbance observer based on the vector control strategy, and its effectiveness is verified by experiments.