Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1990-08-08
1992-08-25
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 90, 384107, 384292, 360 9807, H02K 708, H02K 516
Patent
active
051421739
ABSTRACT:
A bearing structure suitable for a spindle motor or the like, which enables such a motor to rotate with minimal vibrations. The bearing structure comprises a stator including a support shaft which is disposed on a base, and a rotor which is rotatably disposed around the support shaft. A radial hydrodynamic bearing and a thrust hydrodynamic bearing are disposed between the stator and the rotor. The stator has the support shaft, a thrust plate and a radial cylindrical member which is concentric with the support shaft. The thrust plate is secured to an end surface of the radial cylindrical member. The support shaft extends through the centers of the radial cylindrical member and the thrust plate. The rotor has a radial sleeve. The radial hydrodynamic bearing is formed from the inner peripheral surface of the radial sleeve and the outer peripheral surface of the radial cylindrical member, which face each other and either of which is formed with herringbone-shaped grooves for generating dynamic pressure. The thrust hydrodynamic bearing is formed from an end surface of the radial sleeve and a sliding surface of the thrust plate, which face each other and either of which is formed with spiral grooves for generating dynamic pressure. A rolling bearing may be added in order to minimize the starting torque in the bearing structure.
REFERENCES:
patent: 3854781 (1974-12-01), Bildtsen
patent: 3950039 (1976-04-01), Huber et al.
patent: 4487514 (1984-12-01), Mori
patent: 4557610 (1985-12-01), Asada et al.
patent: 4599664 (1986-07-01), Schuh
patent: 4652149 (1987-03-01), Nakaoka et al.
patent: 4656545 (1987-04-01), Kakuta
patent: 4805972 (1989-02-01), Tanaka et al.
Design of Gas Bearings, vol. I, pp. 6.1.21-42.
Design of Gas Bearings, vol. II, pp. 6.3.1-24.
Ebara Engineering Review, No. 143, Apr. 1989, pp. 16-20.
Journal of Japanese Society of Tribologists, vol. 34, No. 2, Feb. 15, 1989, pp. 49-52.
Aiyoshizawa Shun-ichi
Hirokawa Kazuto
Kasahara Kazuyuki
Konno Daisuke
Miwa Sachihiko
Ebara Corporation
Stephan Steven L.
To E. H.
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