电工技术学报  2024, Vol. 39 Issue (12): 3616-3629    DOI: 10.19595/j.cnki.1000-6753.tces.230671
电机及其系统 |
基于转子永磁分段优化的轴向磁通永磁电机涡流损耗分析与试验
刘细平1, 朱治国1, 陈栋2, 史梓豪1, 孙国建2
1.江西理工大学电气工程与自动化学院 赣州 341000;
2.杭州中豪电动科技有限公司 杭州 310000
Analysis and Experiment of Eddy Current Loss of Axial Flux Permanent Magnet Motor Based on Rotor Segment Optimization
Liu Xiping1, Zhu Zhiguo1, Chen Dong2, Shi Zihao1, Sun Guojian2
1. School of Electrical Engineering and Automation Jiangxi University of Science and Technology Ganzhou 341000 China;
2. Hangzhou Zhonghao Electric Technology Co. Ltd Hangzhou 310000 China
全文: PDF (32655 KB)   HTML
输出: BibTeX | EndNote (RIS)      
摘要 轴向磁通永磁电机永磁体中的涡流损耗将使转子温度升高,致使永磁体产生不可逆退磁风险,影响电机的正常运行。该文推导了轴向磁通永磁电机永磁体涡流损耗的数学模型,分析得到永磁体表面涡流路径长度及永磁体表面积对涡流损耗的影响规律;结合理论分析,在永磁体完全分段的基础上,提出了三种永磁体部分分段的优化新方法;利用有限元软件建立了电机有限元分析模型,对永磁体的电流密度分布、涡流损耗、抗退磁能力、静力学强度等进行了仿真分析与比较,获得了较合适的永磁体部分分段数和永磁体保留尺寸。最后制作了样机,测试了电机效率、永磁体磁性能和永磁体温升情况,验证了所提优化方法的有效性及理论分析的准确性。
服务
把本文推荐给朋友
加入我的书架
加入引用管理器
E-mail Alert
RSS
作者相关文章
刘细平
朱治国
陈栋
史梓豪
孙国建
关键词 轴向磁通永磁电机永磁体部分分段涡流损耗静力学永磁体温升    
Abstract:Axial flux permanent magnet motor (AFPM) has the advantages of short axial length, lightweight, high power density, and high torque density, which is widely used in electric vehicles, new energy power generation, and other fields. However, due to structural limitations, the heat dissipation of the rotor is difficult, and the eddy current loss in the permanent magnet (PM) can increase the temperature of the rotor, resulting in irreversible demagnetization risk of PM and affecting the normal operation of the motor. Therefore, three new optimization methods for the partial segmentation of PM are proposed based on the complete segmentation of PM.
Firstly, the mathematical model of eddy current loss of PM of AFPM is derived. Extending the eddy current path on the surface of PM and reducing the surface area of PM can effectively reduce the eddy current loss, which provides a theoretical basis for the proposed optimization method. Secondly, the motor's finite element (FE) analysis model is established using the FE software. The current density distribution, eddy current loss, and anti-demagnetization ability of the PM before and after optimization are simulated. The results show that the proposed optimization method significantly reduces the eddy current loss and has little influence on the magnetic properties of the PM. Simulation results are consistent with the theoretical analysis. Besides, the appropriate number of segments and the reserved size of the PM are obtained. Then, the cutting gap of the optimized PM is modeled separately and filled with epoxy resin glue. Moreover, the mechanical strength of the PM is calculated by the FE method. Accordingly, the mechanical strength of the PM is improved, and the stress generated by the centrifugal force and the unbalanced magnetic tension do not destroy the mechanical structure of the optimized PM. Finally, the motor efficiency, PM magnetic properties, and PM temperature rise are tested through a prototype, which verifies the effectiveness of the proposed optimization method and the accuracy of theoretical analysis.
The following conclusions can be drawn: (1) The optimization effects of the intermediate retention method (IRM) and the alternating cutting method (ACM) of the PM in AFPM are consistent. Both can effectively reduce PM temperature rise, better than the surface cutting method (SCM) and similar to the complete segmentation method (CSM). Under the rated working conditions and the same number of partial segments, compared with the original PM, the reduction ratio of the average eddy current loss of IRM and ACM is about 36.8%, 13% higher than that of SCM, and 9% worse than that of the CSM. Therefore, IRM and ACM are preferred. (2) The eddy current loss of PM decreases with the number of partial segments, and the eddy current loss increases with the increase of the retention size. (3) The proposed optimization method does not affect the anti-demagnetization ability of PM at high temperatures and high currents, which has little effect on the magnetic properties of PM. (4) The epoxy resin filled in the PM gap can improve the mechanical strength of PM, and the maximum equivalent stress is far less than the yield strength. The stresses generated by centrifugal and unbalanced magnetic forces do not destroy the PM mechanical structure.
Key wordsAxial flux permanent magnet motor    permanent magnet partial segmentation    eddy current loss    statics    permanent magnet temperature rise   
收稿日期: 2023-05-15     
PACS: TM351  
基金资助:江西省重大科技专项资助项目(20213AAE02016)
通讯作者: 朱治国 男,1996年生,硕士研究生,研究方向为永磁同步电机设计。E-mail: zhuzhiguozzg26@163.com   
作者简介: 刘细平 男,1976年生,博士,教授,研究方向为稀土永磁电机设计与控制、新能源发电技术。E-mail: liuxp211@163.com
引用本文:   
刘细平, 朱治国, 陈栋, 史梓豪, 孙国建. 基于转子永磁分段优化的轴向磁通永磁电机涡流损耗分析与试验[J]. 电工技术学报, 2024, 39(12): 3616-3629. Liu Xiping, Zhu Zhiguo, Chen Dong, Shi Zihao, Sun Guojian. Analysis and Experiment of Eddy Current Loss of Axial Flux Permanent Magnet Motor Based on Rotor Segment Optimization. Transactions of China Electrotechnical Society, 2024, 39(12): 3616-3629.
链接本文:  
https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.230671          https://dgjsxb.ces-transaction.com/CN/Y2024/V39/I12/3616