Research On 7.5kW Switched Reluctance Starter/generator Platform

With the technique development of MEA and AEA, the two-channel 270V high voltage direct current electrical source will serve as the power system of the new generation airplane. Switched reluctance motor(SRM) is simplicity, low cost, high fault tolerance, high power density and high speed capability, and it can realize dual function of both starter and generator easily. So now it widely applies to starter/generator(S/G) system for aviation and automobile, and has great potential. The modelization and simulation of SRG, fault-tolerant performance of two-channel SRM and the driver system based on DSP TMS320LF2407A are studied in this thesis. The main tasks include:(1) SRM inductance function and flux linkage function are derived from ANSYS which is used for electromagnetic field analysis. Based on the motor flux linkage versus current and rotor position, the nonlinear simulation model of SRG is established by MATLAB/SIMULINK. It also analyses the steady performance, dynamic performance and motor malfunctions by simulation in this nonlinear model. It proves that SRM has good fault tolerance performance.(2) Based on an analysis of the mathematical model of 12/8 structure of the SRG, windings inductance and mutual inductance on different working status are analyzed and researched by simulation. In this paper, a new windings connection mode is proposed to get the decoupling between double channels and improve its capability of single-channel fault tolerant operation mode. Experiment results validate this theory.(3) The designs of the hardware and software of the SRG based on DSP TMS320LF2407A are introduced. The results of experiment verified that the designs of the hardware and software are feasible.