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Magnet-Frozen-Permeability FEA and DC-biased Measurement for Machine Inductance: Application on a Variable-Flux PM Machine
IEEE Transactions on Industrial Electronics ( IF 7.7 ) Pub Date : 2018-06-01 , DOI: 10.1109/tie.2017.2772165
Junhua Chen , Jian Li , Ronghai Qu , Meng Ge

This paper proposes a magnet-frozen-permea-bility finite-element method and an experimental approach for inductance analysis of a variable-flux permanent magnet machine. The machine studied uses Alnico magnets, whose nonlinear magnetic properties deteriorate the inductance calculation accuracy. Besides the machine core permeability is frozen, the magnet-frozen-permeability approach freezes nonlinear B–H curves and nonlinear permeabilities of the magnets in the finite-element analysis. Because the soft magnets have low coercive force, conventional symmetric inductance measurement currents may demagnetize them. This paper presents a zero-start dc-biased current trajectory tracking approach. This approach uses positive current, which avoids demagnetization during the inductance measurement. Meanwhile, based on flux linkage-current curves, influences of resistance can be eliminated. Cross-magnetization effects are evaluated in the two proposed methods. Inductances of these two methods are compared and show good agreements.

中文翻译:

磁体冻结磁导率 FEA 和电机电感的直流偏置测量:在可变磁通永磁电机上的应用

本文提出了一种磁冻结磁导率有限元方法和一种用于可变磁通永磁电机电感分析的实验方法。所研究的机器使用 Alnico 磁体,其非线性磁特性降低了电感计算精度。除了机械芯磁导率被冻结外,磁体冻结磁导率方法在有限元分析中冻结了磁体的非线性 B-H 曲线和非线性磁导率。由于软磁体具有低矫顽力,传统的对称电感测量电流可能会使它们去磁。本文提出了一种零启动直流偏置电流轨迹跟踪方法。这种方法使用正电流,避免了电感测量过程中的退磁。同时,基于磁链-电流曲线,可以消除阻力的影响。在两种建议的方法中评估了交叉磁化效应。比较这两种方法的电感并显示出良好的一致性。
更新日期:2018-06-01
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