Progress in Motors with Superconducting Armature Windings

-Axial-gap Synchronous Motors Cooled by Liquid Nitrogen-

Abstract

An industry-academia research group, of which IHI Corporation is a representative, has performed trial manufacturing of several axial-gap synchronous motors with superconducting windings cooled by liquid nitrogen. In the development of these motors, we were faced with issues of AC loss and current imbalance among the coils connected in parallel due to the inductance difference, which are characteristic of AC applications of superconductors. We took measures for these issues and validated them in a newly constructed motor with a rated power of 400 kW. In this paper, the progress of our motors and a brief summary of the results of the load test for the latest motor are introduced.