Analysis And Calculation Of Electromagnetic Parameters And Static Characteristics Of The Switched Reluctance Motor By FEM

Switched reluctance motor (SRM) system is a new kind of variable-speed drives, which has been developed from 1980s with the rapid advance of power electronics and microelectronics. The system is composed of double-salient reluctance motor, power converter, rotor position sensor and controller. The motor and converter have more simple structure, higher reliability, and more flexible controllability of the system. It could be looked as an important respect in the research field of motor and variable-speed drives.Because the magnetic field of SRM has distinct flux fringe and intense local saturation effect on the stator and rotor poles. 2D and 3D whole field finite element method (FEM) has to be used to calculate the magnetic field distribution, inductance parameters and static characteristics of the model SRM. As a result, distribution principle of magnetism curve is found. At the same time, the inductance modify coefficient in the end zone is discussed by using 3D FEM. So an reasonable inductance modify coefficient is found. According to the magnetic field distribution, some ameliorations are made, then a reasonable and more accurate analytic formula concerned the effect of end zone is presented. Those could provide theory foundation and reasonable equivalent magnetic circuit for the calculation and analysis.A method of determining main dimensions of the SRM is given according to any speed-torque profiles, either. Meanwhile the method of calculating the maximum and minimum inductance is programmed in visual c++ 6.0 language. And an software which can check the characteristics of model SRM only by the structure and magnetic field results is provided. The software has an interactive face that make the calculation direct.At last, in this dissertation a 3 phase and 12/8 poles model SRM is given, the operating principle and inner electromagnetic relationship of SRM are studiedsystematically, its mathematic models are established. Effective methods of calculating parameter, static characteristics and performances, and the optimum design of motors are discussed.