PURPOSE: To enable the efficiency of an apparatus to go up by using superconductive magnets.

CONSTITUTION: Several superconductive magnets 1 or more and several permanent magnets 2 or more are arranged alternately at given spaces in a circle to constitute a stator 3. Permanent magnets 4 one piece less in number than said stator 3 are arranged at given spaces in a circle to constitute a rotor 5. N poles of said permanent magnets 4 of the rotor 5 act on N poles of the permanent magnets 2 and S poles of the superconductive magnets 1 of said stator 3 to repeat repulsion and attraction alternately, which are then converted into rotation to be used as motive power.