Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1991-03-05
1993-06-29
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 67R, 310 905, 384248, H02K 708, H02K 709, F16C 2300
Patent
active
052237583
ABSTRACT:
A spindle motor has a rotor supported by a stator through a thrust bearing and a radial bearing. At least the thrust bearing is a hydrodynamic bearing. The spindle motor is provided with a device for adjusting the thrust laod that is applied to the thrust bearing. The load adjusting device has an electromagnet that is provided on the stator and a permanent magnet that is provided on the rotor in opposing relation to the electromagnet. Either the repelling force or the attraction force, which acts between the electromagnet and the permanent magnet, is controlled by changing the current supplied to the electromagnet.
REFERENCES:
Patent Abstracts of Japan, vol. 13, No. 490 (E-841)(3838), Nov. 7, 1989.
Patent Abstracts of Japan, vol . 11, No. 119 (E-499)(2566), Apr. 14, 1987.
Patent Abstracts of Japan, vol. 4, No. 137 (E-27)(619), Sep. 25, 1980.
Design of Gas Bearings, vol. I, pp. 6.1.21-6.1.42.
Design of Gas Bearings, vol. II, pp. 6.3.1-6.3.24.
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
Kanemitsu Yoichi
Kasahara Kazuyuki
Kataoka Takashi
Konno Daisuke
Ebara Corporation
LaBalle C.
Stephan Steven L.
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