目前，国内外超导电机的研究主要集中在以下几个方面：超导单极直流电机、半超导同步电机和应用超导块材的超导特种电机。
By now , the study of superconducting machine is mainly concentrated on the following aspects : superconducting homopolar machine , superconducting synchronous machine and superconducting special motor using bulk superconductor .
单极直流电机