Analysis of the Experimental Test Results of Laboratory-Scale HTS DC Motor for High-Torque Electric Propulsion

A laboratory-scale direct current (DC) rotating machine with a high-temperature superconducting (HTS) magnets was conceptually designed to obtain 500 W output power under a liquid nitrogen cooling method to verify the operation characteristics of the HTS DC motor. The experimental test results of the HTS motor for high-torque electric propulsion are analyzed and presented in this article. The two HTS magnets were fabricated and assembled using a dynamo system to demonstrate the operation. The excitation current for the two HTS magnets connected in series was kept within 0–40 A using the DC power supplier. The rotational speed of the motor could be kept at 100–600 rpm, and the torque was measured during real-time operation. These test results can be used to design a large HTS DC rotating machine for an electric propulsion system.