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A quasi-three-dimensional (3-D) analytic method is presented for calculating the performance of single-sided linear induction motor with the ladder secondary. To simplify the analytic model, the ladder aluminum plate is equivalent to the flat-solid one, and the equivalent conductivity is derived and given. In the direction of the motion, the finite primary length and end effect are considered by the method of the Fourier transform and Residue theorem. In the transverse direction, considering finite width of the primary core and the region between the overhang of the primary windings and the secondary, the equivalent integral length is given. Finally, the thrust, vertical force and secondary efficiency are calculated and compared with the results of the 3-D finite-element method and experiment, it is shown that the method presented in the paper is much simpler and the accuracy of the analytic method is verified. [ABSTRACT FROM AUTHOR]

This study investigates the influence of the composite secondary with the solid and laminated back iron on the thrust, vertical force, secondary losses and efficiency in the prototype single-sided linear induction motor for metro by space harmonic method. First, a 3-D space harmonic analytical model, which can consider the skin effects, secondary constructions as well as end and edge effects, is proposed. Second, the air-gap flux and secondary eddy current density distributions along longitudinal and transverse directions are presented. Then, variations of secondary losses and efficiency with a specific number of secondary back iron laminations are comprehensively compared in the full slip, and the optimal number of laminations is obtained. Third, the propulsive and vertical forces are analytically calculated under full slip, and the efficiency in a range of rated speed is presented. Finally, these results are verified by measurements on an experimental rig of the linear motor. [ABSTRACT FROM AUTHOR]

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. [ABSTRACT FROM PUBLISHER]