Three-dimensional Finite Element Analysis of Transverse Displacement in Linear Induction Motor

Abstract

Concerned as the linear induction motor(LIM) there appear two kinds of end effect, one is in the running direction and the other in the transversal one. In this paper, we investigate the latter especially. When the reaction rail is displaced in the transverse direction, it causes both the reduction of thrust and the normal force. The purpose of this paper is to investigate such a structure of the reaction rail as to minimize the above phenomena.
In this paper, we analyze 3-D electromagnetic fields of a concrete LIM by using the finite element method(FEM). Especially we consider the cases of both extending the reaction rail and reinforcing the end ring of secondary conductor.
To analyze the transverse end effect exactly, we also devise the expression of the diamond coil.
Some numerical results obtained by this approach are compared with measured ones. The calculated values well agree with the experimental data.