2-D Interpolation of Thrust and Lift Forces in Controlled-PM LSM, Based on Analytical Formulas and FEA

Abstract

Thrust and lift forces in controlled-PM linear synchronous motor (LSM) can be analyzed exactly by using FEM, taking into account the effect of slots. Especially in the controlled-PM LSM Maglev vehicle, large slots are adopted to manufacture quite easily its long-stator guideway. But a vast CPU time is required for FEM simulations of the vehicle dynamics. A method for calculating the thrust and lift forces is presented here which can keep high accuracy of finite element analysis (FEA) and reduce extremely the CPU time. Two-dimensional interpolation of this method is derived on the basis of analytical formulas and FEA of the machine. It is shown from numerical example of 1/2-scale controlled-PM LSM Maglev vehicle that the method proposed here enables us to calculate the thrust and lift forces with the same accuracy as FEM.