A New Approach for Non-Linear Time-Harmonic FEM-Based Analysis of Single-Sided Linear Induction Motor Incorporated With a New Accurate Method of Force Calculation

Abstract

There are some special phenomena like longitudinal end effect, saturation effect, skin effect, edge effect, and half-filled slots which make the single-sided linear induction motor (SSLIM) analysis more complicated comparing to its rotary counterparts. Finite element method (FEM) can be the best choice for complete modeling of SSLIM considering all phenomena. But it is not possible to include the non-linear magnetization curve of iron into the time-harmonic FEM analysis. Thus, this paper proposes a two-dimensional (2-D) time-harmonic FEM considering all phenomena as well as the non-linear magnetization characteristics of iron using appropriate approximation. In order to overcome the Lorentz method calculation error of vertical force caused by inherent discontinuity of magnetic field intensity at the boundaries of elements, a combined Lorentz-Maxwell method is presented. Validity of the methods and final results is proved by comparing the results with analytical and experimental measurements.