In this paper, two variable leakage flux permanent magnet (VLFPM) machines are proposed. The keys are to adopt the rotor with single-layer and double-layer PMs and intentionally create leakage flux paths to extend the operating speed range and increase the machine efficiency. The characteristics of the variable leakage flux of the proposed machines are investigated. In order to improve the performances of the VLFPM machines, the Multi-Objective Genetic Algorithm (MOGA) method is applied for achieving the multi-objective optimizations of variables. Then, the performances of the double-layer permanent magnet variable leakage flux motor (DLPM-VLFM) and the singlelayer permanent magnet variable leakage flux motor (SLPM-VLFM) are analyzed and compared with conventional interior PM machine (CIPMM) in detail. The performances mainly include flux linkage and torque, flux-weakening capability and efficiency. Finally, it is shown by analysis and comparison that the DLPM-VLFM can have a wider range of speed and high efficiency.
In this paper, a controllable leakage flux reverse salient permanent magnet synchronous motor(CLF-RSPMSM) is designed, which has the advantages of wide speed range and low irreversible demagnetization risk. Firstly, the principle of controllable leakage flux and reverse saliency effect is introduced, and the design of the rotor flux barrier is emphatically discussed. Secondly, multiple design variables are stratified by the comprehensive sensitivity method, and the main variables are screened out. Then the relationship between the main variables and the optimization goal is discussed according to the response surface diagram. Thirdly, a sequential nonlinear programming algorithm(SNP) is used to optimize the three optimization objectives comprehensively. Finally, the electromagnetic performance of the proposed motor is compared with the initial IPM motor, the mechanical strength of the proposed rotor is analyzed, and the results verify the effectiveness of the design and optimization method of the proposed motor.
This article proposes a new type of variable-leakage-flux flux-intensifying permanent magnet (VLF-FIPM) machine and performs optimization and multi-physical field analysis on it. By designing leakage flux bypass and various magnetic barriers, the proposed machine has the variable-leakageflux characteristic and reverse saliency characteristic of L d > L q . Firstly, the evolution process from the conventional interior permanent magnet (IPM) machine to the proposed machine is explained. Secondly, the output torque, torque ripple, core loss, and reverse saliency ratio of the proposed machine are optimized by multi-objective comprehensive optimization method. Then the electromagnetic performance of the optimal machine is compared with that of the initial machine and conventional IPM machine. Finally, the temperature field and stress field of the optimal machine in different states are analyzed in detail. Both theoretical results and simulation analysis verify the effectiveness of the proposed design idea and optimization of the VLF-FIPM machine.
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