To form a strong static magnetic field, attain high output and low power consumption, and improve performance, by mounting a flexible magnet having a thermoplastic elastomer and rare earth magnet powder as an inevitable component in the final shape in a molding die while performing suitable axial magnetic field orientation as necessary, in a rotor frame.
An annular magnet motor has a drive winding 3 by fixing an armature core 2 to a base board 1, and a multi-pole magnetized annular magnet 7 is secured to a rotor frame 6 mounted to a rotary shaft 5. Here, rare earth magnet powder, thermoplastic polyurethane elastomer powder, calcium stearate powder, and hydrazine antioxidant are uniformly mixed by using a Henschel mixer(R), kneaded by an extruder and extrusion molded into plate shape, to obtain a thermoplastic polyurethane elastomer sheet containing the rare earth magnet powder. This plate-shaped sheet is heated, cooled, solidified in a compression molding form in an axial magnetic field, formed in a flexible magnet, and mounted as the annular magnet 7 in the stator frame 6.
YAMAGATA YOSHIKAZU
HASHIMOTO SUNAO
SASAKI YUICHIRO
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