Bearing system and brushless DC motor using such system

Details Bearing system and brushless DC motor using such system Bearing system and brushless DC motor using such system

1997-12-17

1999-02-16

Dougherty, Thomas M.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 51, 310 67R, 310 905, 310 90, 384112, 384113, 384114, 384107, H02K 709, F16C 3206, F16C 3382

Patent

active

058724095

ABSTRACT:
A bearing system for brushless DC motors is disclosed. The bearing system has an electromagnetic force generator in a bearing so as to generate an electromagnetic force or a magnetic force. The bearing system thus magnetically attracts the shaft when eccentricity of the shaft in the bearing is reduced during a high speed operation of the shaft, thus allowing the shaft to keep desired eccentricity in the bearing and increasing dynamic pressure of oil in the bearing and preventing a formation of an oil whirl, and improving dynamic characteristics of the motor such as low operational vibrations and noises during a high speed operation of the motor.

REFERENCES:
patent: 5289067 (1994-02-01), Tanaka et al.
patent: 5385410 (1995-01-01), Shirai et al.
patent: 5417507 (1995-05-01), Uno et al.
patent: 5559382 (1996-09-01), Oku et al.
patent: 5723927 (1998-03-01), Teshima
patent: 5751085 (1998-05-01), Hayashi

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