4.4 Article

Influence of Low-Coercive-Force Magnet Property on Electromagnetic Performance of Variable Flux Memory Machine

Journal

IEEE TRANSACTIONS ON MAGNETICS
Volume 58, Issue 8, Pages -

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMAG.2022.3153285

Keywords

Magnetic hysteresis; Magnetic flux; Regulation; Electromagnetics; Coercive force; Magnetic circuits; Permeability; Coercivity; hysteresis model; low-coercive-force (LCF); magnet property; memory machine; remanent flux density

Funding

  1. National Natural Science Foundation of China [52037002, 52077033]
  2. Key Research and Development Program of Jiangsu Province [BE2021052]
  3. Thousand Talents Plan Project of Jiangxi Province [jxsq2020102088]
  4. Fundamental Research Funds for the Central Universities [2242017K41003]
  5. Southeastern University (SEU) Zhishan Scholars Program of Southeast University [2242019R40042]
  6. Jiangsu Education Department for Postgraduate Research and Practice Innovation Program of Jiangsu Province [KYCX20_0100]
  7. Excellence Project Funds of Southeast University

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This study investigates the inherent relationship between the properties of low-coercive-force permanent magnets (PMs) and the electromagnetic characteristics of variable flux memory machines (VFMM) using a combined solution integrated with magnetic equivalent circuit (MEC) and graphical methods. The study models and analyzes the magnetization properties using simplified mathematical models, and qualitatively analyzes the characteristics of VFMM using a newly developed coupled approach.
The magnetization properties of low-coercive-force (LCF) permanent magnets (PMs), i.e., remanent flux density, coercivity, and hysteresis curve slopes, are closely related to the magnetization characteristics of variable flux memory machine (VFMM). Therefore, this article investigates the inherent relationship between the properties of LCF PMs and electromagnetic characteristics of VFMM using a combined solution integrated with magnetic equivalent circuit (MEC) and graphical methods. First, the hysteresis curve of the LCF PM is analytically modeled by a simplified piecewise linear hysteresis model to characterize the mathematical relationships among the key parameters of the hysteresis model. Then, a simplified MEC method is used to obtain the permeability curves of VFMM, thereby further determining the intrinsic relationship between the dimensional parameters of the LCF PM and the electromagnetic characteristics of VFMM. Afterward, the flux regulation characteristics and on-load magnetization state (MS) stabilization capability of VFMM are qualitatively analyzed using a newly developed coupled approach. Furthermore, the electromagnetic characteristics of three VFMMs equipped with different version LCF PM materials are comprehensively compared using the finite-element (FE) method. Finally, a VFMM prototype using the selected AlNiCo magnet is manufactured and tested to verify the correctness of the theoretical and FE analyses.

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