Research On Control Strategy Of Hybrid Excitation Doubly Salient Motor

Since the switched reluctance machine, the doubly salient permanent magnet motor(DSPM) and the electric exciting doubly salient motor(EEDSM) were put forward, the hybrid excitation doubly salient motor(HEDSM) is a new type of speed regulating one. It combines the merits of both DSPM and EEDSM, overcomes their defects and becomes a new research focus in the field of doubly salient motor. Now, the research on HEDSM is mainly focused on its fundamental theory and the research method at home and abroad, including the static characteristics, the steady-state performance and the stability analysis, etc.. However, the speed regulating method and the control strategy are less researched, these are mainly concentrated in this dissertation.Firstly, the development history about doubly salient motor and the research situation on hybrid excitation motor are reviewed in this dissertation. The basic structure and the flux-adjusting principle are presented, and the mathematics model is constructed. Furthermore, the torque mechanism and operation principle are introduced.Secondly, the speed regulation simulation model of HEDSM, main controller and field current controller are established with the help of Simulink and Simpowersystems toolbox of Matlab software. The simulation platform is provided for the research on the control strategy of HEDSM drive system. Finally, the control idea of dividing section is presented for the demand of the variable speed HEDSM drives system. Under the basic speed, the current limiting module relates the dynamic relation among speed regulating, voltage regulating and excitation enhancing, while above the one the relation among the speed regulating, voltage regulating and field weakening is decided by back EMF PI adjustor. Therefore, the dynamic optimization control of the speed, voltage and excitation is achieved. Moreover, the control strategy and the simulation model are verified by the simulation samples.