Permanent magnet shaft bearing

Details Permanent magnet shaft bearing Permanent magnet shaft bearing

1993-03-25

1994-06-14

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

384277, H02K 709, F16C 3302

Patent

active

053213297

ABSTRACT:
A permanent magnet shaft bearing includes a shaft bearing bushing and a flange bearing bushing which are magnetized to saturation. The outer surface of the shaft bearing bushing is magnetized to have the same polarity as the inner surface of the flange bearing bushing so that both bearing surfaces repel one another. Such repulsion creates a space between the bearing surfaces so that no physical contact is present. Both the flange bearing bushing and the shaft bearing bushing are tapered to mate each other. The shaft load requirements determine the magnetic flux density, the mass of the bearing bushings, the composition of the bearing bushings, and the proper angle of the taper. An insulating sleeve protects the bearing bushings from heat transfer in order to help retain permanent magnetization. A magnetically impermeable shield protects the bearing bushings from attracting metal particles.

REFERENCES:
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patent: 3614181 (1971-10-01), Meeks
patent: 3746407 (1973-07-01), Stiles et al.
patent: 3977739 (1976-08-01), Moskowitz et al.
patent: 4040681 (1977-08-01), van der Heide
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patent: 4128280 (1978-12-01), Purtschert
patent: 4379598 (1983-04-01), Goldowsky
patent: 4898480 (1990-02-01), Raj et al.
patent: 4984909 (1991-01-01), Shirotori
patent: 5161900 (1992-11-01), Bougathou et al.
M. Dussaux Jun. 1990, Status of the Industrial Applications of the Active Magnetic Bearings Technology. The American Society of Mechanical Engineers, 90-GT-268; presented at the Gas Turbine Congress and Exposition, Brussels, Belgium.

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