Electro Magnetic Field and Eddy Current Analysis of Linear Induction Motor Using Analytical Method

Abstract

Background/Objectives:Instead of the finite element method, which is mainly used for linear induction motor analysis, the analytical method using the spatial harmonic method was applied and verified.

Methods/Statistical analysis: In this the electromagnetic field analysis and the eddy current density analysis of the linear induction motor are carried out by the analytical method using the spatial harmonic method based on the Maxwell equation.After simplifying the analytical model, the governing equations in each region are established using Maxwell’s equations. And then, we perform the electromagnetic field analysis in each region using boundary conditions.

Findings: In this paper, based on the analysis method using spatial harmonics, the magnetic field and eddy current analysis of the LIM are performed. The results of magnetic field based on magnetic vector potential and Maxwell’s equations were in good agreement with those of FEA analysis. Also, it can be seen that the magnetic flux density due to the eddy current induced in the secondary side causes an imbalance in air magnetic flux density. Also, as a result of the analytical method, the slip of the induction motor was considered.The mathematical expressions used in this paper are useful for understanding and predicting the magnetic field distribution and eddy current density in the initial design of the LIM.

Improvements/Applications: There are not many papers dealing with electromagnetic field and eddy current density analysis that change with time considering slip.It will be useful in designing linear induction motor.