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US 8,552,601 B2Granted
Electric motor and electrical machinery equipped therewith
AssigneePanasonic Corporation
InventorsHirofumi Mizukami, Akihiko Watanabe
Life of this patent
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Abstract
An electric motor includes a stator including stator steel core (11) around which a coil is wound; a rotor which includes rotating body (30) that holds a plurality of permanent magnets (32) in the circumferential direction to face the stator, and shaft (16) that fastens rotating body (30) so as to penetrate the center of rotating body (30); a bearing (15) for supporting shaft (16); and bracket (17) for fixing bearing (15), wherein dielectric layer (50) is provided between shaft (16) and the outer periphery of rotating body (30).
Claims15
An electric motor comprising:
- a stator including a stator steel core around which a coil is wound wherein the stator steel core is molded with a mold material;
- a rotor which includes a rotating body that faces the stator, and a shaft that fastens to the rotating body so as to penetrate the center of the rotating body;
- a bearing having steel balls for supporting the shaft so that the rotor freely rotates;
- and
- a bracket for fixing the bearing,
- wherein a dielectric layer is provided between an inner periphery and an outer periphery of the rotating body, the dielectric layer being configured and made of a selected material to approximate an impedance of a rotor side with an impedance of a stator side.
3 more elements
Dependencies are inferred from the claim text.