To obtain in a short cycle time a permanent-magnetic motor which does not cause sliding between a stator core and a frame, and is stable in low cogging torque.
The permanent-magnetic motor comprises: a stator core 1 which is composed of a cylindrically formed magnetic body, and in which a plurality of slots 1b are wound with windings and a plurality of first axial grooves 1c are circumferentially formed at equal intervals at the external periphery of the core; the cylindrical frame 5 in which a round hole 5a whose internal diameter is larger than the outside diameter of the stator core 1 is formed, the stator core 1 is arranged, and a plurality of second axial grooves 5b are formed at a position opposing the first axial grooves 1c of the round hole 5a; a plurality of spacers 7 which are interference-fit to the first and the second axial grooves 1c, 5b, and fix the stator core 1 to the frame 5 interposing a clearance 2 therebetween; and a stator core 3 which is rotatably supported to the frame 5 and arranged in the stator core 1, has a plurality of magnets 4 at its external periphery and is composed of a columnar magnetic body.
NAGAO MASASHI
IKEDA YASUHIRO
YOSHIOKA TAKASHI
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