| With the development of power electronics, motor manufacturing technology, progress of theories of AC speed regulation system and new control strategies, Permanent Magnet Synchronous Motor has obtained the widespread development and application, particularly in the case that required high precision and high reliability, such as national defense, robot, automotive electronics and so on. And it also holds the pivotal status in the modern alternating current motors.PMSM fuzzy adaptive control which bases on vector control system is the research object in this thesis. Firstly the development of AC speed regulation system, the control strategies used in the PMSM control system and the mathematics model of PMSM are generalized in this thesis. Then, PMSM vector control system is set up. Good performance can be achieved when the PI controller's parameters match with the control system. However, the parameters of PI have to be modified when the system's parameters change. Fuzzy control has the advantage of not relying on the object mathematical model and strongly robustness so it can overcome the uncertainty of element in the system such as parameter change and non-linear change and can realize the high quality control performance of the system. Fuzzy control combined with PI control is applied in the PMSM control system. The simulation results under MATLAB/SIMULINK environment prove that better performance can be obtained by using the compound controller than PI controller.In view of PMSM uncertainty, one kind of indirect adaptive fuzzy controller is used. Indirect adaptive fuzzy controller which uses universal approximation property of fuzzy systems through online adjustment adaptive parameters can guarantee the convergence of the PMSM output to the given signal. Theoretical study and the simulation research indicate that the system response still have a good dynamic performance and track reference signal when PMSM parameter or the load suddenly change. |
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