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Abstrucf-This paper describes a readhesion control system for the Korean High-speed Railway; To reduce the wheel abrasion and to improve traction efficiency, the adhesion characteristics between wheel and rail are analyzed. Also the re-adhesion control system is designed as a subsystem of induction motor control. In order to verify the performance of the proposed system, a downscaled readhesion control simulator is utilized. Both simulation and running test are executed and the results are evaluated.

In this paper, a study on the efficiency improvement of the magnetic levitation train using the LIM (Linear Induction Motor) was presented. The maglev train has the advantage of being environmentally friendly since much less noise and dust is produced. However, due to structural limitation, compared to a rotating induction motor, linear induction motor, the main propulsion engine of the maglev train has a relatively greater air gap and hence has the lower operation efficiency. In this paper, the relationship between the operating condition of the train and the slip frequency has been investigated to find out the optimum slip frequency that might improve the efficiency of the magnetic levitation train with linear induction motor. The slip frequency is variable during the operation by this relationship only within a range that does not affect the levitation system of the train. After that, the comparison of the efficiency between the conventional control method with the slip frequency fixed at 13.5 [Hz] and the proposed method with the slip frequency variable from 9.5[Hz] to 6.5 [Hz] has been conducted by simulation using Simplorer. Experiments of 19.5[ton] magnetic levitation trains owned by Korea Institute of Machinery and Materials were carried out to verify the simulation results.

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Parallel Induction motor drive with PWM inverter control has been developed for the High-speed Railway. This paper describes a re-adhesion control system to improve a tractive efficiency and to reduce the wheel abrasion. The adhesion characteristics of the high-speed train are analyzed to get the maximum adhesion effort and the readhesion control system is designed as a subsystem of induction motor control. In order to verify the performance of the proposed system, a downscaled readhesion control simulator is set up and running tests are executed.