Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1990-07-19
1992-02-18
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 90, 310 51, 384107, H02K 5167, F16C 3510
Patent
active
050897322
ABSTRACT:
A spindle motor which is designed to rotate with minimal vibrations and hence is suitable for a hard disk driver. The spindle motor employs hydrodynamic bearings as radial and thrust bearings. A support shaft is formed in a cylindrical configuration with a center hole, and a rotor has a columnar portion which is inserted into the center hole in the support shaft. A thrust bearing collar is attached to the lower end of the rotor, and a thrust bearing member is secured to a base in opposing relation to the thrust bearing collar. A group of stator coils and a radial bearing member are disposed on either the inner peripheral surface of the center hole in the support shaft or the outer peripheral surface of the support shaft, and a group of rotor magnets and a radial bearing sleeve are disposed on either the outer peripheral surface of the columnar portion or the inner peripheral surface of the rotor in opposing relation to the stator coil group and the radial bearing member.
REFERENCES:
patent: 4515486 (1985-05-01), Ide
patent: 4553183 (1985-11-01), Brown et al.
patent: 4599664 (1986-07-01), Schuh
patent: 4645960 (1987-02-01), Hoffman
patent: 4652149 (1987-03-01), Nakaoka et al.
patent: 4656545 (1987-04-01), Kakuta
patent: 4698542 (1987-10-01), Muller
patent: 4922406 (1990-05-01), Schuh
patent: 4998033 (1991-03-01), Hisabe et al.
patent: 5012359 (1991-04-01), Kohno et al.
"Spiral Groove Ceramic Bearings and Their Application to Products" by Osada et al., Ebara Engineering Review, No. 143, Apr. 1989, pp. 16-20.
Journal of Japanese Society of Tribologists, Feb. 15, 1989, pp. 49-52.
Aiyoshizawa Shun-ichi
Hirokawa Kazuto
Kasahara Kazuyuki
Konno Daisuke
Miwa Sachihiko
Ebara Corporation
Stephan Steven L.
To Edward
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