Title:
BEARING SYSTEM AND BRUSHLESS DC MOTOR USING SAME
Document Type and Number:
Japanese Patent JP3294178
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To increase a pressure generation rate of oil and to improve a high velocity dynamic characteristic, by providing an electromagnetic force generating means generating definite pressure in a fluid between a shaft and an inner wall, and by attracting the shaft by the electromagnetic force generating means when dynamic pressure of the fluid is reduced in the process of a high velocity revolution.
SOLUTION: On the upper part of a base 10, a stator 14 wound with a coil 15, a bearing 11, and a hub 16 are provided, and a shaft 12 is fitted. An electromagnetic force generating means 19 decentering the shaft 12 is provided within the bearing 11. The electromagnetic force generating means 19 is provided with an electromagnet 20 wound with a coil. When dynamic pressure of oil within the bearing 11 is reduced in the process of a high velocity revolution of the shaft 12, power is applied to the coil, the electromagnet 20 generates electromagnetic force, and the shaft is attracted to it. Thus, the shaft 12 is decentered against the bearing 11 by force, the dynamic pressure of the oil is increased, then the high velocity revolutionary dynamic characteristic is improved.
Inventors:
Chung Chengcheon
Application Number:
JP34789797A
Publication Date:
June 24, 2002
Filing Date:
December 17, 1997
Export Citation:
Assignee:
Samsung Electric Co., Ltd.
International Classes:
F16C32/00; F16C17/02; F16C32/04; F16C39/06; H02K7/09; H02K21/22; H02K29/00; H02K5/16; (IPC1-7): F16C32/00; F16C32/04; H02K7/09; H02K21/22; H02K29/00
Domestic Patent References:
| JP5248435A | ||||
| JP6233495A | ||||
| JP4119220A | ||||
| JP8121478A |
Attorney, Agent or Firm:
Aoyama Ryo (1 person outside)
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