Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1992-05-15
1994-06-28
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
360 9807, 360 9908, H02K 714, G11B 1702, G11B 1708
Patent
active
053250044
ABSTRACT:
A spindle motor includes a housing, a shaft member fixed in the housing, a rotor rotatably supported on the shaft member, a rotor magnet mounted on the rotor, and a stator placed facing with the rotor magnet. The housing and the shaft member are made of materials different in hardness and a sleeve having substantially the same level of hardness as the shaft member is placed between the housing and the shaft member. A bushing is provided between bearing members and the rotor which is rotatably supported by the bearing members. The bushing and a yoke which is mounted on the rotor are secured together in the axial middle part of the bushing. In addition, through holes which enable communications between the interior and exterior area of the motor are provided in the bushing.
REFERENCES:
patent: 4814652 (1989-03-01), Wright
patent: 4843500 (1989-06-01), Elsasser et al.
patent: 4905110 (1990-02-01), Krum et al.
patent: 5001581 (1991-03-01), Elsasser et al.
patent: 5061868 (1991-10-01), Iwazaki et al.
patent: 5160865 (1992-11-01), Gururangan
patent: 5179483 (1993-01-01), Lowe
Mori Yoichi
Noguchi Kiyoharu
Yokoyama Takashi
Yonei Hiroyuki
LaBalle C.
Nippon Densen Corporation
Stephan Steven L.
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