Brushless motor and method of manufacturing the same

Details Brushless motor and method of manufacturing the same Brushless motor and method of manufacturing the same

2005-09-27

2008-12-16

Hanh, Nguyen N (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

Reexamination Certificate

active

07466050

ABSTRACT:
Fluid bearing mechanisms (6aand6b) are formed between a shaft (2) and a central part (21) of an oil impregnated sintered sleeve (13). The oil impregnated sintered sleeve (13) has such an inner surface formed to be larger in aperture ratio at a thrust support end (23) and a loading end (22) than at a central part (21). With this configuration, it is possible to achieve a brushless motor which can suppress an increase in bearing loss while obtaining necessary bearing stiffness at high rpm.

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