PURPOSE: To increase torque without changing the whole shape of an apparatus by magnetizing respective peripheral end faces of disc magnetic materials of a rotor block with polarities different from those of magnetic poles on circumferentially magnetized both faces of said magnetic materials.
CONSTITUTION: A rotor block 6 is composed of disc permanent magnets 7 and a rotating shaft 5 passing through rotor bushes 8a, 8b provided in the center of said permanent magnets 7; N and S poles of the permanent magnets 7 formed by magnetization of magnetic materials are alternately subjected to uniform magnetization in a circumferential direction, both faces of each permanent magnet 7 are magnetized alternately, and both sides thereof are respectively of heteropolar structure. Further, respective N and S poles of peripheral end faces of the permanent magnets 7 are also magnetized in a circumferential direction with polarities different from those of magnetic poles circumferentially and radially adjacent thereto. Thus, a magnetic flux flowing through a stator core is increased so as to increase torque so much.
HIRATA KATSUHIRO
TAKAMI HIROYUKI
