Study on electric motors with bulk superconductors in the rotor

We have studied electric motors using YBCO bulk superconductors in the roto r. The superconductor can be used as a screening material, a magnetic hyste resis material, a flux sourer, or a secondary conductor, and form several t ypes of motors. This paper describes experimental results of torque charact eristics obtained with a small electric motor using a superconducting bulk rotor, which was operated in the synchronous and slip modes. Dependence of the torque on the stator three-phase current (gap flux density) and the sli p frequency will be analyzed. (C) 2001 Published by Elsevier Science B.V.