Brushless motor and method of manufacturing the same
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United States of America Patent
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Dec 16, 2008
Issued Date -
N/A
app pub date -
Sep 27, 2005
filing date -
Oct 25, 2004
priority date (Note) -
Expired
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Abstract
Fluid bearing mechanisms (6a and 6b) 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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