Improvement of the Propulsion Force by the Excitation Principle of the Propulsion Coil in the Permanent Magnet-HTS Hybrid Magnetically Levitated Transport System

The permanent magnet-HTS hybrid magnetically levitated transport system has been developed. In this system, the repulsive force of a permanent magnet and the pinning force of high temperature superconductor (HTS) are combined. The magnetic gradient is generated by exciting the air core coil on the magnetic rail so that the propulsion force is generated. In this paper, a propulsion method is studied, and the experimental device is developed. The propulsion coil installed on the magnetic rail, when excited, acts in changing its magnetic gradient, which produces a propulsion force on the HTS of the transporter. The effective excitation method of the propulsion coil is shown, and the propulsion force increases. As the flux of the propulsion coil acts on the HTS on the transporter, its influence on the HTS is investigated. From the results, it is confirmed that the excitation method that using the rear side HTS produces a larger propulsion force and go back force. Using two propulsion coils proved to be more efficient.