Abstract：This paper analysed the magnetization performance of a variable flux memory machine (VFMM) with the method of permanent magnet (PM) hysteresis model and finite element analysis (FEA). Through the study of Alnico magnets’ magnetization characteristics, a novel hysteresis model was built, then the demagnetization curves can be calculated under different d-axis current. Besides, the FEA method of magnetization and demagnetization in VFMM was given in the paper. Based on the hysteresis model and FEA method, this paper studied the field distribution of the VFMM during the magnetization process, and investigated the effect of armature current and rotor position on the PM flux density to reduce the maximum magnetization current and pulse duration, then the loss caused by the magnetization current can be reduced, and good magnetization performance can be obtained. Next, considering the nonuniform distribution of the PM flux density, the paper calculated the back EMF, air gap flux density and magnetization ratio curve in different magnetization states and estimated the magnetization performance of the VFMM. Finally, a prototype machine was fabricated to verify the accuracy of the analysis method, and good agreement was achieved between the tested results and calculated results.
葛梦, 李健, 陈俊桦. 变磁通记忆电机磁化特性分析[J]. 电工技术学报, 2020, 35(zk1): 117-125.
Ge Meng, Li Jian, Chen Junhua. Analysis on Magnetization Characteristics of a Variable Flux Memory Machine. Transactions of China Electrotechnical Society, 2020, 35(zk1): 117-125.
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2020, Vol. 35 
