Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1997-05-19
1998-11-10
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 905, 384107, 384112, H02K 708, H02K 516
Patent
active
058348700
ABSTRACT:
An oil impregnated porous bearing unit includes an arrangement wherein an oil impregnated porous bearing containing ferro-fluid is fixed in a non-magnetizable housing, a ring shaped permanent magnet is disposed so that the ferro-fluid will exist in a gap between a rotary shaft, whereon the ring shaped permanent magnet is fixed, and the oil impregnated porous bearing, and the ferro-fluid circulates between a slide plane of the bearing and a body of the oil impregnated porous bearing with rotation of the rotary shaft by utilizing the magnetic attractive force of the permanent magnet and a capillary phenomenon in the oil impregnated porous bearing. In addition, a spiral groove may be provided in an exterior circumferential surface of the permanent magnet fixed to the rotary shaft or in an interior circumferential surface of the housing facing the above exterior circumferential surface of the permanent magnet in order to generate dynamic pressure at the spiral groove portion with rotation of the rotary shaft so as to supply ferro-fluid to the oil impregnated porous bearing.
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Aizawa Michihiro
Miyasaka Motohiro
Nii Katsutoshi
Shikata Hideo
Tokushima Hidekazu
Enad Elvin G.
Hitachi , Ltd.
Stephan Steven L.
LandOfFree
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