Design optimization and performance investigation of novel linear induction motors with V-shaped ladder-slit secondary

Abstract

In order to reduce the transverse edge effect of linear induction motors (LIMs) for low-speed Maglev train, this paper proposes a novel single-sided LIMs (SLIMs) with V-shaped ladder-slit secondary. Firstly, the topology of this SLIMs is introduced based on the erected 3-D finite element model. Secondly, for the V-shaped ladder-slit secondary, the effect of slot combination is investigated, and then the secondary is optimized by a single-parameter optimization method, including the width of secondary side-bars, secondary slot width, transverse width of secondary slits and the skew angle of V-shaped slits. Thirdly, the air gap flux density, eddy current, thrust force and normal force of this SLIMs are calculated, respectively. By comparing to those of two SLIMs with available double ladder-slit and cap-solid secondary, the results show the proposed novel SLIMs can improve the performance due to effectively reducing the transverse edge effect. Finally, to the proposed SLIMs, the effect of the middle bar in V-shaped ladder-slit secondary is studied. It is found that adopting middle bar can improve the performance and increase the mechanical strength, which is more suitable for low-speed Maglev train.

Keywords

Double ladder-slit secondary linear induction motor low-speed Maglev train optimization design edge effect V-shaped

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