Development of a superconducting linear synchronous motor

Abstract

High Tc superconducting (HTS) wires were applied to primary coils of a small size permanent magnet linear synchronous motor. Three-phase racetrack shaped test coils were fabricated and tested. The HTS coils were cooled down to 33 K by using a GM-cryocooler in order to overcome the decrease of the critical current density due to high intensity of magnetic field in the coil. A vacuum chamber and thermal shield for reduction of the radiation and the convection heat penetrations were fabricated. The parameters of the linear motor were calculated by using finite element method, and verified by experiment. It is possible to achieve large thrust force compared with that of a conventional machine because large current can flow in HTS primary coil.Index Terms-GM-cryocooler, HTS, large thrust force, linear synchronous motor.

Thrust characteristics of a double-sided high temperature superconducting linear synchronous motor with a high temperature superconducting magnetic suspension system

“…The thrust model of the HTSLSM is built using a magnetic circuit method and the thrust characteristics obtained from the model are compared with finite element analysis and practical testing results. 4 Compared to the conventional linear motors, the HTSLSM has a number of advantages such as lower weight, smaller size, higher thrust, and higher efficiency, as it uses zero-resistance and high critical current HTS tapes or strongpinning HTS bulks with high trapped magnetic fields. V C 2011 American Institute of Physics.…”