Sensorless Permanent Magnet Synchronous Motor Drive System Based On Fuzzy Control

With the development of microprocessor technology, power electronics technology and permanent magnetic materials manufacturing techniques, as well as tructure and operating characteristics of permanent magnet synchronous motor (PMSM), the PMSM drive system is widely applied in the areas of industrial and agricultural production. But the good performances of PMSM drive system are based on closed-loop control, it is quite important of how to obtain the rotor position and speed signals in this system. Traditionally, the rotor position of the control system is mainly supplied by the resolver or optical encoder disk, but such position sensors have the nature defects of high costs, maintenance difficulties and poor performances in bad working conditions. Thus, sensorless control strategy which only according the sampling of the current and voltage to estimate the rotor position and speed by specific methods will be widely applied. To enhance the speed, stability and robustness of PMSM drive system further, fuzzy control method which has the characteristic of easy configuration, continue output, high reliability, small overshoot and strong robustness has gained more and more attention.In this paper, sensorless permanent magnet synchronous motor drive system for the study is mainly divided into two parts of MATLAB/SIMULINK simulation and system software and hardware achievement. In the first part, the auther established a mathematical model of PMSM, and on this basis, introduced the relevant principles of vector control, particularly the optimal control strategy used in this paper. At the same time, the author not only established a sliding mode observer to replace traditional mechanical position sensors according to the relevant principles, but also fuzzy PI to replace traditional PI under the introduction of fuzzy control theory, and then completed MATLAB simulation of the system. The second part included the designing of a hardware experiment platform using TMS320F2808DSP for core control chip, software development and plant debugging.The results of MATLAB simulation and experiment, which show the prime control performance of the program and effectiveness of the system, prove that this program is an ideal control method.