Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1999-08-03
2000-12-26
Mullins, Burton
Electrical generator or motor structure
Dynamoelectric
Rotary
310 43, 310 89, 310 91, 310254, H02K 515, H02K 504
Patent
active
061664685
ABSTRACT:
The object of the present invention is to provide a rotary electric machine which has high assembly accuracy, high heat dissipating efficiency, and excellent durability at the bearing portion. A motor comprises a case, a stator secured within the case, and a rotor formed into one piece with a rotary shaft. The case is provided, on both end faces, with flanges, and one of the flanges is provided with a ball bearing. A stator is radially secured within the case, resin is filled in between the stator and the case with a space of the rotor being left, and a bearing housing and a boss are formed on one side. An open portion is formed in between ribs of the bearing housing, and inserting the bearing into the bearing housing causes a part of the bearing to be exposed through the open portion to fixedly contact with the flange. This allows supporting the bearing securely, and allows frictional heat generated, and the like, to dissipate to the outside via the flange. Furthermore, this allows mounting bearings with high accuracy, and reducing noise accompanying mechanical and electromagnetic vibrations.
REFERENCES:
patent: 4340830 (1982-07-01), Hoyer-Ellefsen
patent: 4384226 (1983-05-01), Sato et al.
patent: 5465020 (1995-11-01), Peterson
patent: 5494356 (1996-02-01), Strobl
patent: 5783888 (1998-07-01), Yamano
patent: 5806169 (1998-09-01), Trago et al.
patent: 5856718 (1999-01-01), Matsushita et al.
Fujitani Sakae
Matsushita Kunitake
Muramatsu Kazuo
Nishio Taichi
Sano Hiroshi
Minebea Co. Ltd.
Mullins Burton
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