Design and Comparison of Interior Permanent Magnet Synchronous Motors Using Different Bulk Superconductor Arrangements

This paper deals with electromagnetic design of interior permanent magnet-type synchronous motors (IPMSMs) using bulk superconductors. Three kinds of IPMSMs with different bulk superconductor arrangements in the rotor were considered. IPMSMs using permanent magnets were also designed. The evaluation of the IPMSM characteristics: magnet torque, reluctance torque, magnetic flux density, and losses at room temperature are presented. Also, the torque-to-magnetic bulk/PM-volume ratio for all conceptual designs is evaluated. The results show that the superconducting IPMSM can obtain over 490 kNm/m 3 against 300 kNm/m 3 of conventional IPMSMs.