Electromagnetic Characteristics Analysis of Primary Permanent Magnet Linear Motor for Rail Transit

doi:10.11985/2018.05.001

Abstract

Abstract:

The problem of low power factor and low efficiency is existed in the application of the linear induction drive motor to the rail transit system. This paper puts forward a kind of special structure of primary permanent magnet linear motor. The motor consists of short primary (rator side) and long secondary (stator side), armature windings and permanent magnets are installed in the primary side, and secondary are only salient pole reluctance. This kind of motor not only has the advantages of simple linear structure, non adhesion and direct drive, but also has good performance indexes such as power factor and efficiency, and has broad application prospects. Firstly, the structure characteristics and operation mechanism of the motor are introduced in detail. The air gap flux density equation and the synchronous speed equation are deduced by using the equivalent magnetic circuit method. Second, a 12/8 pole primary permanent magnet linear motor is designed. Parametric modeling and magnetic field analysis are carried out by using finite element software, and the influence of secondary polar arc coefficient on magnetic field modulation capability is obtained. Then, the air gap magnetic field of the motor is analyzed, and the winding back EMF waveform and the gap density fourier decomposition pattern are obtained. Finally, the static characteristics are studied, and the influence of secondary structure on the positioning force and the influence of the magnitude of current on the static electromagnetic thrust are studied. The simulation results show the rationality of the electromagnetic design scheme. It provides a valuable reference for the study of the linear drive motor of rail transit.

Key words: PPMLM, rail transit, pole-arc coefficient, finite element method

CLC Number:

TM359.4

Yang Xiong,Zhang Fengge,Wang Xiuping. Electromagnetic Characteristics Analysis of Primary Permanent Magnet Linear Motor for Rail Transit[J]. Journal of Electrical Engineering, 2018, 13(5): 1-7.

Figures/Tables 10

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