Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1990-04-09
1991-03-05
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 90, 360 9807, 384112, F16C 3510, H02K 516, H02K 2122
Patent
active
049980335
ABSTRACT:
A spindle motor comprising a stator including a support shaft positioned on a base, a cap-shaped rotor rotatably and concentrically disposed around the support shaft, thrust and radial bearings disposed between the stator and the rotor, a stator coil secured to the stator, and a rotor magnet member secured to the rotor opposing the stator coil. The thrust and radial bearings are hydrodynamic bearings. A movable piece that constitutes a part of the thrust bearing is secured to the lower end of a cylindrical portion of the rotor and extended outwardly or inwardly from the cylindrical portion, or is disposed above the rotor. The stator coil is secured to the outer peripheral portion of the support shaft above or below the radial bearing. The rotor magnet member is securd to the inner peripheral surface or inner top surface of the rotor. Either a radial or axial gap is provided between the stator coil and the rotor magnet member.
REFERENCES:
patent: 4200344 (1980-04-01), Binns et al.
patent: 4509160 (1985-04-01), Eggers
patent: 4538081 (1985-08-01), Kamiya et al.
patent: 4673997 (1987-06-01), Gowda et al.
patent: 4822182 (1989-04-01), Matsushita et al.
patent: 4824122 (1989-04-01), Raj et al.
patent: 4934781 (1990-06-01), Kato et al.
Design of Gas Bearings, 1972, vols. I and II.
Ebara Engineering Review No. 143, Apr. 1989.
Journal of Japanses Society of Tribologists, vol. 34, No. 2, Feb. 15, 1989.
Aiyoshizawa Shun-ichi
Hirokawa Kazuto
Hisabe Yasushi
Kanamori Toshiya
Kasahara Kazuyuki
Ebara Corporation
Rebsch D. L.
Stephan Steven L.
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