Research And Realization On The Optimization Of Excitation For Full-period Bearingless Switched Reluctance

The power density of switched reluctance generators (SRGs) is lower than that of permanent magnet generators. Combining SRGs with the technology of bearingless, the full-period bearingless switched reluctance generator (FPBSRG) is studied, which is hopeful to improve the limitation of power density in SRGs as well as holding the high-speed adaptability of them.Firstly, the mathematical model is deduced, and the simulation model is built in MATLAB. Meanwhile, the experimental platform is built, which contains digital control system, power drive system, FPBSRG, and asynchronous motor.Based on the above works, the wide-excitation strategy is proposed to increase excitation and improve levitation force as well as holding the control complexity. The FPBSRG in chopping mode is researched based on the analysis and applications of SRGs. The phase current is obtained, and the expression between flux-linkage and current is also deduced to analyze the energy conversion. The optimization method of firing angles is proposed to increase the output voltage. The simulations and experiments are included to validate the advantage of wide-excitation strategy and verify the effectiveness of current analysis. And the effectiveness of firing angle optimization method is also verified.In the last part of the thesis, the prospect of research is presented.This subject is supported by NSFC (NO. 50877036).