Motor having a hydrodynamic bearing and cooling device using the

Details Motor having a hydrodynamic bearing and cooling device using the Motor having a hydrodynamic bearing and cooling device using the

1999-02-26

2000-09-26

Enad, Elvin

Electrical generator or motor structure

Dynamoelectric

Rotary

384107, H02K 0516, F16C 1702

Patent

active

061246573

ABSTRACT:
A long service-life motor free from oil-spill from its bearing is achieved by a construction including the following elements: a frame having an opening, a housing disposed on the frame and having one side thereof open, a stator secured to the housing, a sleeve situated in the housing and having an inner wall extending straight in its axial direction, a rotary shaft extending through the sleeve and being rotatably supported by the sleeve, an annular recess formed on part of the shaft and facing the inner wall of the sleeve, a tapered section of the shaft end facing a bottom face of the housing, a rotor having a magnet opposite to the stator, and oil lubricated in a space between the shaft and the sleeve, and pooled in the groove as well as in another space formed by the tapered section, the bottom face of the housing and the sleeve. This construction allows the bearing to be downsized and also processed with ease. This motor enables a cooling device to be smaller in size and to operate more efficiently at a lower noise level.

REFERENCES:
patent: 4781476 (1988-11-01), Uhen
patent: 5427456 (1995-06-01), Hensel
patent: 5698925 (1997-12-01), Coupart
patent: 5810480 (1998-09-01), Asada et al.

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