Force Analyze of Axial Magnetic Flux Permanent Magnet Motor under Eccentricity Condition
Zhang Xiaoting1, Zhang Bingyi1, Cao Yongpeng2
1. School of Electrical Engineering Shenyang University of Technology Shenyang 110870 China; 2. Chongqing Jinkang E-Powertrain Co. Ltd Chongqing 400032 China
Abstract：In order to study the influence of eccentricity on the force of axial flux permanent magnet motor, an analytical model of the air gap magnetic field in the ideal state is established. The slot is also accounted for by introducing the air gap permeability function. The influence of the air gap magnetic field; through the analysis of the eccentric state of the axial flux permanent magnet motor, an analytical model of the air gap magnetic field in the eccentric state was established, and the accuracy of the analytical calculation model was verified by the finite element method. Based on the analytical method, calculation model of the unbalanced magnetic force of the axial flux permanent magnet motor under eccentric state is constructed, and the unbalanced magnetic force is calculated and analyzed. Regardless of static eccentricity or dynamic eccentricity, the amplitude of unbalanced magnetic force gradually increases with increasing eccentricity. Under static eccentricity, the unbalanced magnetic force does not change with time; under dynamic eccentricity, the unbalanced magnetic force changes periodically.
张霄霆, 张炳义, 曹永鹏. 偏心状态下的轴向磁通永磁电机受力分析[J]. 电工技术学报, 2020, 35(zk1): 110-116.
Zhang Xiaoting, Zhang Bingyi, Cao Yongpeng. Force Analyze of Axial Magnetic Flux Permanent Magnet Motor under Eccentricity Condition. Transactions of China Electrotechnical Society, 2020, 35(zk1): 110-116.
[1] 曹永娟, 黄允凯, 金龙. 磁极组合型轴向磁场无铁心永磁电机的设计与分析[J]. 中国电机工程学报, 2014, 34(6): 903-909. Cao Yongjuan, Huang Yunkai, Jin Long.Design and analysis of a stator coreless axial-flux permanent magnet machine with module poles[J]. Proceedings of the CSEE, 2014, 34(6): 903-909. [2] Huang Wanying, Bettayeb A, Kaczmarek R.Optimi- zation of magnet segmentation for reduction of eddy current losses in permanent magnet synchronous machine[J]. IEEE Transactions on Energy Con- version, 2010, 25(2): 381-387. [3] Metin Aydin, Mehmet Gulec.A new coreless axial flux interior permanent magnet synchronous motor with sinusoidal rotor segments[J]. IEEE Transactions on Magnetics, 2016, 52(7): 125-130. [4] 王晓远, 齐丹丹, 王辉. 定子无磁轭模块化轴向永磁电机磁极表面开槽分析[J]. 电工技术学报, 2017, 32(16): 145-152. Wang Xiaoyuan, Qi Dandan, Wang Hui.Analysis on magnet surface groove of yokeless and segmented armature axial flux motor[J]. Transactions of China Electrotechnical Society, 2017, 32(16): 145-152. [5] 左曙光, 吴双龙, 吴旭东, 等. 轴向磁通永磁同步电机转矩解析模型和转矩优化[J]. 电工技术学报, 2016, 31(23): 46-53. Zou Shuguang, Wu Shuanglong, Wu Xudong, et al.Analytical model and optimization of torque of an axial flux permanent magnet synchronous motor[J]. Transactions of China Electrotechnical Society, 2016, 31(23): 46-53. [6] 鲍晓华, 吕强, 王汉丰. 基于齿部磁场分析的大型潜水电机气隙偏心故障研究[J]. 电工技术学报, 2016, 31(8): 90-95. Bao Xiaohua, Lü Qiang, Wang Hanfeng.Study on air-gap eccentricity fault in large submersible motors with tooth magnetic field analysis[J]. Transactions of China Electrotechnical Society, 2016, 31(8): 90-95. [7] Zhu Ziqiang, Wu Lijian, Mohd J M L. Influence of pole and slot number combinations on cogging torque in permanent-magnet machines with static and rotating eccentricities[J]. IEEE Transactions on Industry Applications, 2014, 50(5): 3265-3277. [8] Kim U, Lieu D K.Magnetic field calculation in permanent magnet motors with rotor eccentricity: with slotting effect[J]. IEEE Transactions on Magnetics, 1998, 34(4): 2253-2266. [9] Marignetti F, Vahedi A, Mirimani S M.An analytical approach to eccentricity in axial flux permanent magnet synchronous generators for wind turbines[J]. Electric Power Components and Systems, 2015, 43(9): 1039-1050. [10] Araki S, Ind D, Kusatsu K, et al.Analyses of electromagnetic forces of concentrated winding permanent magnet brushless motors with rotor eccentricity[J]. Electrical Machines and Systems, 2009, 10(2): 1-4. [11] Yu Yingquan, Bi Chao, Hla P N.Incline unbalanced magnetic pull induced by misalignment rotor in PMSM[J]. IEEE Transactions on Magnetics, 49(6): 2709-2714. [12] Vansompel H, Sergeant P, Dupre L.A multilayer 2-D-2-D coupled model for eddy current calculation in the rotor of an axial-flux PM machine[J]. IEEE Transactions on Energy Conversion, 2012, 27(3): 784-791. [13] Hendrik V, Peter S, Luc D.Effect of segmentation on eddy-current loss in permanent-magnets of axial-flux PM machines using a multilayer-2D: 2D coupled model[C]//Proceedings of the 20th International Conference on Electrical Machines, Marseille, France, 2012, DOI: 10.1109/ICElMach.2012.6349869. [14] Mirimani S M, Vahedi A, Marignetti F.Effect of inclined static eccentricity fault in single stator-single rotor axial flux permanent magnet machines[J]. IEEE Transactions on Magnetics, 2012, 48(1): 143-149. [15] 张冉, 王秀和, 杨玉波, 等. 基于等效剩磁法的永磁电动机转子偏心磁场解析计算[J]. 电工技术学报, 2009, 24(5): 7-13. Zhang Ran, Wang Xiuhe, Yang Yubo, et al.Analytical prediction of magnetic field in permanent magnet motors with rotor eccentricity based on the method of equivalent remanence[J]. Transactions of China Electrotechnical Society, 2009, 24(5): 7-13.
2020, Vol. 35 
