Analysis of the influence of magnetic stiffness on running stability in a high-speed train propelled by a superconducting linear synchronous motor. (February 2019)

• Record Type: Journal Article
• Authors: Lee, Jin-Ho; Lee, Chang-Young; Jo, Jeong-Min; Lim, Jungyoul; Choe, Jaeheon; Sun, Yan; Lee, Kwan-Sup
• Is Part Of: Proceedings of the Institution of Mechanical Engineers. Volume 233:Number 2(2019)
• Page Start: 170
• Page End: 186
• Publication Date: 2019-02
• Subjects: High-speed train -- running stability -- magnetic stiffness -- superconducting linear synchronous motor -- dynamic analysis; Railroads -- Periodicals; Personal rapid transit -- Periodicals; 625.1
• DOI: 10.1177/0954409718785296
• Languages: English
• ISSNs: 0954-4097

Abstract

There are two major obstacles that prevent a conventional train from achieving high speed: the limitation of wheel–rail adhesion and the increase of instability in the wheel–rail running dynamics. To overcome these problems, a new hybrid train model is introduced in this study. This train utilizes a superconducting linear synchronous motor (SC-LSM), instead of a traction motor, for propulsion; therefore, this train does not have the limitation of adhesion between the wheel and the rail. Using an SC-LSM also improves the stability of the train during high-speed operations. The magnetic stiffness between the train and the guideway is additionally generated by using the SC-LSM, which is favorable for the running stability at a high speed. This study focuses on the magnetic stiffness and its effect on the running stability in the proposed hybrid train model. First, the magnetic stiffness in the SC-LSM is investigated both theoretically and experimentally. Then, a train dynamic model including the magnetic stiffness is developed and the effect of magnetic stiffness on the running stability is analyzed through various simulations.