A Novel MMF Distribution Model for 3-D Analysis of Linear Induction Motor With Asymmetric Cap-Secondary for Metro

This paper develops a novel magnetomotive forces (mmfs) distribution model along the transverse direction for the 3-D analysis of linear induction motor, and it investigates the influence of a laterally asymmetric cap-secondary on the thrust, vertical force, lateral force, and efficiency in a prototype single-sided linear induction motor for linear metro. First, the mmf distribution model and its working conditions are defined, and the model is transferred into a mathematical model. Second, the air-gap flux and secondary eddy current in a prototype linear motor with a cap-secondary are obtained by a 3-D space harmonic analytical method. Third, the thrust, vertical force, lateral force, and efficiency of the test motor are analyzed with various lateral deflection, and the power factor in secondary is also presented. Finally, these results are experimentally verified by measurements on the test rig of the linear motor, and the comprehensive effect on the operating performance can be accurately calculated by the mmf model.

[1]  Byung-Taek Kim,et al.  Effect of contact resistance between side-bar and secondary conductors in a linear induction motor with a cage-type secondary , 2003 .

[2]  Jang-Young Choi,et al.  Analysis of force characteristic of a linear induction motor considering secondary overhang effect , 2015, 2015 18th International Conference on Electrical Machines and Systems (ICEMS).

[3]  Chang-Sung Jin,et al.  Influence of the Construction of Secondary Reaction Plate on the Transverse Edge Effect in Linear Induction Motor , 2009, IEEE Transactions on Magnetics.

[4]  Sakutaro Nonaka,et al.  On the design of a single-sided linear induction motor for urban transit , 1992 .

[5]  Shouguang Sun,et al.  Analysis of forces in single-side linear induction motor with lateral displacement for linear metro , 2016 .

[7]  S. Nasar,et al.  A complete equivalent circuit of a linear induction motor with sheet secondary , 1988 .

[8]  Tadashi Yamaguchi,et al.  3-D finite element analysis of a linear induction motor , 2001 .

[9]  Qinfen Lu,et al.  Investigation of Forces in Linear Induction Motor Under Different Slip Frequency for Low-Speed Maglev Application , 2013, IEEE Transactions on Energy Conversion.

[10]  Ion Boldea.  Linear Electric Machines, Drives, and MAGLEVs Handbook , 2013 .

[11]  S. Nonaka,et al.  Elements of linear induction motor design for urban transit , 1987 .

[12]  Wei Xu,et al.  Equivalent Circuit Derivation and Performance Analysis of a Single-Sided Linear Induction Motor Based on the Winding Function Theory , 2012, IEEE Transactions on Vehicular Technology.

[13]  Dae-Hyun Koo,et al.  Investigation of Linear Induction Motor According to Secondary Conductor Structure , 2009, IEEE Transactions on Magnetics.

[14]  H. Bolton.  Forces in induction motors with laterally asymmetric sheet secondaries , 1970 .

[15]  S. Yamamura.  Theory of Linear Induction Motors , 1972 .

[16]  Tong Zhou,et al.  Investigation of Forces and Secondary Losses in Linear Induction Motor With the Solid and Laminated Back Iron Secondary for Metro , 2017, IEEE Transactions on Industrial Electronics.