| Compared to the other machine types, Switched Reluctance Motor (SRM) offers an excellent balance between cost, reliability, power density and high speed capacity. But because of relatively shorter time spent in this research and the complex nonlinearity of controlling system, a lot of problems still exist in further research. The main research about SRM is as follows: magnetic characteristics analysis, design of power circuit, indirect rotor-position detecting and simulation of the control system etc.because the magnetic field of SRM has distinct flux fringe and intense local saturation effect on the stator and rotor poles, this paper summarized and described systematically the fundamental principles and the development of electromagnetic field in the motor, and adopted 2D whole field finite element method based on ANSYS software to calculate the magnetic field distribution and static characteristics of the model SRM. The results of simulation have indicated distribution principle of magnetism curve on several typical rotor location, then the magnetization curves of electromagnetic field in the SRM were simulated, and theΨ-i-θcurve, inductance curve and static torque curve were obtained. Above discussion could provide reliable theory foundation for the reasonable establishment of nonlinear model SRM and the further exploitation and application.The indirect rotor-position detecting method was analyzed. A novel rotor position angle estimation using fuzzy logic was studied. In this dissertation, some knowledge about error signals were detailed, at the same time, a method of improving precision was also provided. Last, MATLAB/SIMULINK as simulation tool is used to make research for the whole SRD system and operating characteristics and rotor position angle estimation based on the nonlinear model SRM. An analysis was also given on the concepts of robustness and reliability. It is shown that the fuzzy logic based scheme is robust to erroneous and noisy signals commonly found in motor drives. |
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