Research On Control Strategy And Driving System Of Five-Phase Flux Switching Permanent Magnet Machines

Based on the traditional three-phase flux-switching permanent magnet (FSPM) machine, the five-phase FSPM machine is proposed, by reasonable matching and optimization design for the tooth of rotor and slot of stator. Due to the smaller mutual inductance, the five-phase E-core 20/18 FSPM machine with higher fault tolerance, which can make further advantages of multiphase machines, is chosen as the control object for this thesis.Based on the analysis of the working principle and electrical and magnet parameters, the research on control strategy and driving system for the five-phase E-core FSPM machine are made. The key content of this thesis is listed as follows:1) Based on the working principle of traditional three-phase FSPM machine, analysis of the basic structure and working principle of the five phase of E-core FSPM machine is carried out;2) Production process of the new structure machine is introduced briefly, and the static electromagnetic characteristics of the machine are analyzed;3) A detailed analysis of the control strategy of five-phase FSPM machine drive system is conducted, including the control block diagram of the system, the current hysteresis loop control, space voltage vector pulse width modulation control, and the simulation results and analysis are given;4) An open-circuit fault tolerant strategy for the five-phase E-core FSPM machine is proposed based on the principle of keeping the magneto-motive force constant under both healthy and faulty conditions. Then, Matlab/Simulink-based simulations for an ideal five-phase PMSM driving system and FEA-based predictions for the actual five-phase FSPM machine driving system are performed, respectively, to verify the effectiveness of the fault tolerant strategies.5) A DSP-based digital driving system is set up to verify the theoretical and simulated results. The principle and design process are introduced.6) According to the theory of control strategy and fault tolerance above, as well as the classic drive system principle, the software of C language program based on DSP chip is completed.7) A5kW five-phase E-core FSPM prototyped machine is manufactured and experiments are carried out on a DSP-based digital driving system to verify the theoretical and simulated results.