Design Of Hybrid Outer Rotor Single Winding Bearingless Switched Reluctance Motor And Digital System

Motors with traditional bearings cannot satisfy the need of high-speed application. Bearingless switched reluctance motors(BSRMs) contain the characteristics of the switched reluctance motors and magnetic bearing. BSRM has the advantages of low loss, high axial utilization rate and high critical speed, which makes BSRM be widely applied in flywheel energy storage, aerospace industry and other fields. After years of research, a variety of the structure of BSRM has been put forward by experts at home and abroad. Compared with the double winding BSRM, the single winding BSRM has the advantages of high winding utilization rate, stable operation, easy to control and other outstanding features, which attracts domestic and foreign scholar’s attention. In this article, the 12/8 structure of the hybrid outer rotor single winding BSRM was taken as the research object. The operating principle, mathematical model, optimal design and digital system of motor had been studied. This article was supported by the National Natural Science Foundation of China(51377074). The main work of this thesis is as follows:(1) The structure and operation principle of 12/8 hybrid outer rotor SWBSRM were studied in this paper. The method of mathematical modeling based on the virtual displacement method and the equivalent circuit method was presented to apply on the salient pole rotor and disc rotor respectively. The finite element simulation analysis was used to verify the exactitude of the mathematical models to provide the theoretical basis for the optimization of motor parameters.(2) The design of 12/8 hybrid outer rotor SWBSRM was analyzed in this paper, and the calculation formula of main dimension has been deduced. The parameters of the motor were analized by the finite element method, and the main parameters were found to be optimized according to the influence of the parameters on the torque and levitation force.(3) The particle swarm optimization was used to optimize the main parameters of 12/8 hybrid outer rotor SWBSRM. The multi-objective optimization with the motor’s performance was constructed. The optimization process of key parameters was designed and the reliability of the optimization results was verified by the finite element method.(4) The high speed digital control system was established by DSP and FPGA as the core. Signal detection circuit, hardware interface circuit, power circuit and hardware interface circuit were designed in the hardware system; and the main procedure, initialization procedure and interrupt procedure were designed in the software system.As a conclution,the whole contents were summarized and the topics of the further research was pointed out.