A Study on a Basic Design and Optimization of LSM for Superhigh Speed Maglev Train

Abstract

The numerous studies on Magnetic Levitation Train are recently executed. Usually the magnetic levitation train needs to install a linear synchronous motor (LSM). There are several types of the linear synchronous motor but for the maglev train, it is essential to use wound type synchronous motor due to the fact that the permanent magnet type confronts a lot of difficulties. It is impossible to produce a permanent magnet sufficiently large enough for the maglev train and also the magnetic force will be decrease with enlargement. Since the study on the wound type synchronous motor is very few due to the fact that this type is not commonly used except for the power generator, the approach of this study is based on the design of permanent magnet synchronous motor. The new design flow is established by modifying the elements influenced by the changes such as a material (permanent magnet to winding) and a shape (round type to linear type). Then this basic design flow is confirmed its validity which analysis using equivalent circuit. The design of LSM for maglev train will be executed as a following phase. The validity of the basic design flow is verified with processing basic design through the analysis by using equivalent circuit and FEM analysis. The model built by basic design show a large slot opening as a result of a fault generated during production. For this reason the thrust ripple of the basic designed LSM is very large. In order to complement, the use of MPSS method is recommended and the shape optimization allow the reduction of thrust ripple.