Topology Optimization of Rotor Pole in Switched Reluctance Motor for Minimum Torque Ripple |
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Authors: | Haijun Zhang Shuhong Wang |
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Affiliation: | 1. Faculty of Physics and Electronics Engineering, Hubei University of Arts and Science, Xiangyang, China;2. State Key Laboratory of Electrical Insulation and Power Equipment, Faculty of Electrical Engineering, Xi'an Jiaotong University, Xi'an, China;3. State Key Laboratory of Electrical Insulation and Power Equipment, Faculty of Electrical Engineering, Xi'an Jiaotong University, Xi'an, China |
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Abstract: | Torque ripple is a major problem for switched reluctance motors, which may cause undesirable vibration and acoustic noise, especially at low speed. This paper presents an optimal topology structure of rotor for 8/6 pole switched reluctance motor by using the level set method. The nonlinear ferromagnetic material boundary of rotor pole is implicitly represented through an embedded level set function. This method is applied to obtaining the optimal distributions of material in the design domain for minimizing torque ripple and maximizing average torque. In the optimization objective function, the reluctivity of ferromagnetic material is selected as the design variable. The normal velocity is derived from sensitivity analysis, where the adjoint variable method is utilized. Two-dimensional finite element method is employed to calculate the electromagnetic parameters of this electric machine. Analysis results obtained from the transient simulation of electromagnetic field coupled with control circuit show that the torque ripple is reduced effectively by using the optimized rotor structure. |
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Keywords: | Switched reluctance motor torque ripple level set method finite element method topology optimization sensitivity analysis transient simulation rotor pole magnetic density distribution electrical machine |
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