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[1] YANG Gongde, MA Junchao, LIN Mingyao,. Accurate calculation of induced electromotive force for axial field hybrid permanent magnet memory machine [J]. Journal of Southeast University (English Edition), 2025, 41 (3): 375-383. [doi:10.3969/j.issn.1003-7985.2025.03.013]
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Accurate calculation of induced electromotive force for axial field hybrid permanent magnet memory machine()
轴向磁场混合永磁记忆电机感应电势的精确计算
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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:
41
Issue:
2025 3
Page:
375-383
Research Field:
Electrical Engineering
Publishing date:
2025-09-11

Info

Title:
Accurate calculation of induced electromotive force for axial field hybrid permanent magnet memory machine
轴向磁场混合永磁记忆电机感应电势的精确计算
Author(s):
YANG Gongde1, MA Junchao1, LIN Mingyao2
1.College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108, China
2.School of Electrical Engineering, Southeast University, Nanjing 210096, China
杨公德1, 马军超1, 林明耀2
1.福州大学电气工程与自动化学院，福州 350108
2.东南大学电气工程学院，南京 210096
Keywords:
axial field;  hybrid permanent magnet excitation;  memory machine;  induced electromotive force (EMF);  accurate calculation
轴向磁场; 混合永磁励磁; 记忆电机; 感应电势; 精确计算
PACS:
TM351
DOI:
10.3969/j.issn.1003-7985.2025.03.013
Abstract:
The axial field hybrid permanent magnet memory machine (AFHPM-MM) employs a hybrid permanent magnet excitation combining NdFeB and AlNiCo, achieving high torque density and a wide flux adjustment range. A separated stator structure is adopted to enhance its antidemagnetization capability. To analyze the contributions of AlNiCo and NdFeB to the induced electromotive force (EMF) in the AFHPM-MM, a frozen permeability-based induced EMF calculation method is proposed. Theoretical analysis reveals that the conventional method exhibits substantial errors in calculating the AlNiCo-induced EMF, primarily attributed to its failure to adequately account for the dynamic magnetization characteristic discrepancies of AlNiCo under varying magnetization states. Through the analysis of magnetization variations in AlNiCo during the flux adjustment process under different magnetization states, an improved induced EMF calculation method is proposed. Comparative results indicate that, during the flux enhancement process, the average calculation error of the AlNiCo-induced EMF is reduced from 19.84% to 2.09%, whereas during the flux weakening process, the error is reduced from 3.87% to 1.67%. The proposed method achieves accurate induced EMF calculation for the AFHPM-MM.
轴向磁场混合永磁记忆电机（AFHPM‑MM）采用NdFeB与AlNiCo混合励磁，在提升转矩密度的同时实现宽调磁范围；该电机采用分离式定子结构，增强电机抗退磁能力。为分析AlNiCo和NdFeB对AFHPM⁃MM感应电势的贡献，提出基于冻结磁导率的感应电势计算方法。理论分析表明，由于未充分考虑AlNiCo在不同磁化状态下的动态磁化特性差异，该方法在计算AlNiCo感应电势时存在较大误差。通过分析调磁过程中不同磁化状态下AlNiCo磁化差异，进一步提出改进感应电势计算方法。对比实验结果表明：在增磁过程中，AlNiCo感应电势平均计算误差由19.84%降低至2.09%；在弱磁过程中，误差由3.87%降低至1.67%。该方法实现了AFHPM‑MM感应电势的精确计算。

References:

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Memo

Memo:
Received 2024-12-11,Revised 2025-02-25.
Biography:Yang Gongde (1988—), male, doctor, associate professor, gdyang@fzu.edu.cn.
Foundation items:The National Natural Science Foundation of China (No.52107039), the Fujian Provincial Natural Science Foundation for Youth (No. 2021J05133), the Key Project of the National Natural Science Foundation of China (No.51937002).
Citation:YANG Gongde,MA Junchao,LIN Mingyao.Accurate calculation of induced electromotive force for axial field hybrid permanent magnet memory machine[J].Journal of Southeast University (English Edition),2025,41(3):375-383.DOI:10.3969/j.issn.1003-7985.2025.03.013.DOI:10.3969/j.issn.1003-7985.2025.03.013
Last Update: 2025-09-20