Experimental study of thrusts of a cylindrical linear synchronous motor with an HTS coil magnet as the excitation system

Abstract

The thrusts of a cylindrical linear synchronous motor with an HTS coil magnet as the excitation system were measured the first time and will be presented in this paper. The HTS coil magnet is made of second generation YBCO wire. The coil is a double pancake coil consisting of 34 turns wire. The inner diameter, outer diameter and height of the coil are 20, 30 and 13mm, respectively. The armature of the motor is three phases, and the inner diameter is 40mm. It is made of copper windings. With a direct current of 40A for the HTS coil magnet and a RMS current of 10A for the armature, a peak thrust of 3.8N was measured at the temperature of 77K and a radial gap of 5mm between the armature and the excitation system. Effects of armature current, coil current, running time, magnetizers and seams between magnetizers were also studied. In the experiments, the peak thrusts of different types of HTS coil magnets were about from 1.3 times to 8 times as strong as the peak thrust of the coreless coil magnet under the same conditions.