Abstract：In this paper, based on equivalent surface current method, analytical formulas for air gap radial flux density of multi-pole brushless DC motor (BLDCM) in stator inner surface is obtained, when magnetic tile model magnetized in parallel is different centers and different radii. By means of comparison of the detecting back EMF waveform of the multi-phase prototype motor, the analytical formula is effective and accurate. The analytical formula of air gap flux density generated by permanent magnet whose shape is different radii and centres is deduced, solving the problem that flat-roofed back EMF waveform is difficult to obtain by magnetic tile model magnetized in parallel, improving the precision of air gap flux density and parameter calculation. All these provide important theory basis for accurately designing and analysing about multi-pole BLDCM.
孟光伟, 李槐树. 多极永磁无刷直流电动机瓦形磁钢气隙磁通密度的解析计算[J]. 电工技术学报, 2011, 26(9): 37-42.
Meng Guangwei, Li Huaishu. Analytical Calculation for Air Gap Flux Density of Multi-Pole Permanent Magnetic Brushless DC Motor. Transactions of China Electrotechnical Society, 2011, 26(9): 37-42.
[1]胡文静. 永磁无刷直流电动机的发展及展望. 微电机, 2002, 35(4): 37-38. [2]孙建忠, 白凤仙. 特种电机及其控制[M]. 北京: 中国水利水电出版社, 2005. [3]Zhu Z Q, Howe D. Instantaneous magnetic field distribution in brushless permanent magnet DC motors, part I: open-circuit field[J]. IEEE Transactions on Magnetics, 1993, 29(1): 124-135. [4]胡敏强, 黄学良. 电机运行性能数值计算方法及其应用[M]. 南京: 东南大学出版社, 2003. [5]Seok Myeong Jang, Kyoung Jin Ko. Electrome- chanical parameters calculation of permanent magnet synchronous motor using the transfer relations theorem[J]. IEEE Transactions on Magnetics, 2007, 43(6): 2495-2497. [6]陶果, 邱阿瑞, 李大雷. 新型横向磁场永磁同步电动机电感参数计算与功率因数分析[J]. 微电机, 2007, 40(9): 14-17. [7]Meng Guangwei, Xiong Hao, Li Huaishu. Calculation of big air-gap magnetic field in poly-phase multi-pole BLDC motor[C]. Proceedings of the 11th International Conference on Electrical Machines and Systems, Wuhan, China, 2008: 804. [8]汤蕴缪. 电机内的电磁场[M]. 2版. 北京: 科学出版社, 1998. [9]王秀和. 永磁电机[M]. 北京: 中国电力出版社, 2007. [10]唐任远. 现代永磁电机理论与设计[M]. 北京: 机械工业出版社, 2000.
2011, Vol. 26 
