To provide a surface-magnetic type and an inner magnetic-type rotors having high bonding strength between a magnet and a soft magnetic yoke, and exhibiting high structural reliability and favorable motor characteristics even in high speed application, and a manufacturing method therefor.
The surface magnet-type rotor is composed of an anisotropic bond magnet and a soft magnetic section. To manufacture the surface magnet-type rotor, the anisotropic bond magnet is preliminarily molded in a magnetic field, and then molded finally in a nonmagnetic field to be integrated with the soft magnetic section and heat-cured. Magnetic units each having magnetic poles formed by bonding a pair of permanent magnets such that directions of magnetization are symmetric with respect to the bonding surface are connected to form an anisotropic magnet body, in which the magnetic units are arranged so that magnetic poles of different polarities appear alternately on a magnetism action surface. Favorable motor characteristics are attained by setting the direction of magnetization of the permanent magnets at an angle of 20°±10° relative to the radial direction passing the bonding surface.
COPYRIGHT: (C)2007,JPO&INPIT
Masahiro Mita
Keiko Kikuchi
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