A study on electromagnetic and mechanical characteristics of the field coil in HTS motor

作者：Kim S B^*; Kadota T; Joo J H; Sano H; Murase S; Lee S H; Hong J P; Kim H M; Kwon Y K; Jo Y S

来源：Physica C-Superconductivity and Its Applications, 2010, 470(20): 1756-1762.

DOI：10.1016/j.physc.2010.05.201

• HTS motor
• Racetrack coil
• J(c) distribution
• Mechanical stress

High temperature superconducting (HTS) motors electromagnetically consist of a rotator wound with HTS wires and an armature with conventional copper wires like Litz wire. The HTS rotor windings, as field coils, consist of a straight part and an end-ring part. Because a major rotation torque is induced by an interaction between magnetic fields and current-carrying conductors in the straight part, most of mechanical stresses in the motor occur at the straight part. An end-ring is placed in the edge of the straight part and used to connect to each adjacent straight-part coils. The magnetic fields by coil currents concentrate on the end-ring part, therefore, it is expected that the critical current of the entire coil, straight and end-ring, can be determined by the magnitude of the field in the end-ring. This paper deals with the overall J(c) degradation in the end-ring part by self-field generated from the coil. In addition to electromagnetic analyses, we have performed a numerical analysis in order to evaluate mechanical stresses in the straight part of field coil by armature reaction on steady-state operation. The analytical results will be presented in this paper.

• 出版日期2010-11-1