Magnetic fluid bearing unit structure and motor having the same

Details Magnetic fluid bearing unit structure and motor having the same Magnetic fluid bearing unit structure and motor having the same

1997-01-24

1998-10-13

LaBalle, Clayton E.

Electrical generator or motor structure

Dynamoelectric

Rotary

384114, H02K 516, F16C 3206

Patent

active

058216553

ABSTRACT:
A magnetic fluid bearing unit has a bearing housing, a bearing member having magnetic fluid as a lubricating agent, a rotary body rotatively supported by the bearing member, an upper permanent magnet arranged inside the bearing housing, and a lower permanent magnet arranged inside the bearing housing, the bearing member being sandwiched by the upper permanent magnet and the lower permanent magnet. The bearing member is a radial porous oil-containing bearing member in which the magnetic fluid is impregnated. The upper permanent magnet is set to have one direction of magnetic pole orientation, and the lower permanent magnet is set to have the same direction of magnetic pole orientation as the upper permanent magnet. The bearing member is sandwiched by the upper permanent magnet and the lower permanent magnet to confine the magnetic fluid. Over a wide range of rotation speeds, the leakage and the scattering of the magnetic fluid from the bearing unit can be prevented. The bearing unit for a compact size motor having a high rotation accuracy can be obtained.

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