Abstract：This paper presents a research on air-gap magnetic field distribution and mutual inductance asymmetry phenomenon of the sectionally powered AC linear motor. With consideration of the harmonic magnetic field, the paper deduces the analytical expressions of the distribution of the air-gap magnetic field and the self- and mutual- inductance of the motor. Additionally, the paper verifies the correctness of the analytical expressions with help of the finite element simulation. The analysis shows that, the existence of the unexcited primary induces an additional off-set pulsating component in the air-gap flux density of the motor with common winding type, which results in the mutual inductance asymmetry, and the degree of the asymmetry lies of the length of the unpowered primary and that of the powered section. As to the motor with new winding type, the mutual inductance asymmetry results from the asymmetry of the arrangement of the winding, and the degree of the asymmetry only lies on the poles of the powered section, has nothing to do with the unpowered section. And compared with the motor with common winding type, the motor with the new winding type could apparently reduce the degree of the mutual inductance asymmetry.
牟树君, 柴建云, 孙旭东, 王善铭. 分段供电交流直线电机三相互感不对称分析及抑制[J]. 电工技术学报, 2015, 30(1): 81-88.
Mu Shujun, Chai Jianyun, Sun Xudong, Wang Shanming. Analysis and Restrain of Mutual Inductance Asymmetry in the Sectionally Powered AC Linear Motor. Transactions of China Electrotechnical Society, 2015, 30(1): 81-88.
[1] Patterson D, Monti A, Brice C, et al. Design and simulation of an electromagnetic aircraft launch system [C]. Proceedings of the 17th International Conference on Magnetically Levitated Systems and Linear Drives, 2002: 1950-1957. [2] 王江波, 李耀华, 严陆光. 长初级双边直线电机高性能控制策略[J]. 电工技术学报, 2011, 26(5): 126-131. Wang Jiangbo, Li Yaohua, Yan Luguang. High performance control strategy for long primary double sided linear motors[J]. Transactions of China Electro- technical Society, 2011, 26(5): 126-131. [3] Stumberger G, Zarko D, Timur Aydemir M, et al. Design and comparison of linear synchronous motor and linear induction motor for electromagnetic aircraft launch system[C]. Proceedings of the International Electric Machines and Drives Conference, 2003: 494- 500. [4] 许金, 马伟明, 鲁军勇, 等. 长定子直线感应电机饱和特性和非线性计算[J]. 电工技术学报, 2012, 27(9): 183-190. Xu Jin, Ma Weiming, Lu Junyong, et al. Saturation characteristics analysis and nonlinear calculation methods of long-stator linear induction motors[J]. Transactions of China Electrotechnical Society, 2012, 27(9): 183-190. [5] Patterson D, Monti A, Brice C W. Design and simulation of a permanent-magnet electromagnetic aircraft launcher[J]. IEEE Transactions on Industry Application, 2005, 41(2): 566-574. [6] 许金, 马伟明, 鲁军勇. 无槽双边长定子直线异步电动机二维磁场分布及电磁力计算[J]. 电工技术学报, 2008, 23(9): 38-44. Xu Jin, Ma Weiming, Lu Junyong. Analysis of 2-D magnetic field and calculation of electromagnetic force of slotless long stator double-sided linear induction motor[J]. Transactions of China Electrotechnical Society, 2008, 23(9): 38-44. [7] 上海工业大学, 上海电机厂. 直线异步电动机[M]. 北京: 机械工业出版社, 2000. [8] 鲁军勇, 马伟明, 孙兆龙, 等. 多段初级直线感应电动机静态纵向边端效应研究[J]. 中国电机工程学报, 2009, 29(33): 95-101. Lu Junyong, Ma Weiming, Sun Zhaolong, et al. Research on static longitudinal end effect of linear induction motor with multi-segment primary[J]. Procee- dings of the CSEE, 2009, 29(33): 95-101. [9] 孙兆龙, 马伟明, 鲁军勇, 等. 长初级双边直线感应电动机静态纵向边端效应及阻抗矩阵研究[J]. 中国电机工程学报, 2010, 30(18): 72-77. Sun Zhaolong, Ma Weiming, Lu Junyong, et al. Research of static longitudinal end effect and impedance matrix for long primary double-sided linear induction motors[J]. Proceedings of the CSEE, 2010, 30(18): 72-77. [10] 许金, 马伟明, 鲁军勇, 等. 分段供电直线感应电机气隙磁场分布和互感不对称分析[J]. 中国电机工程学报, 2011, 31(15): 61-68. Xu Jin, Ma Weiming, Lu Junyong, et al. Analysis of air-gap magnetic field distribution and mutual inductance asymmetry of sectionally powered linear induction motor[J]. Proceedings of the CSEE, 2011, 31(15): 61-68.
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