Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1992-12-08
1993-12-21
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 90, 384102, H02K 709, H02K 708, F16C 2100
Patent
active
052724034
ABSTRACT:
An assembly in which a rotating shaft is supported by a magnetic bearing has a back-up bearing to support the shaft in the event of failure of the magnetic bearing, the back-up bearing comprising one or more coaxial bearing parts each including cylindrical rolling elements supported on a single raceway, or each part comprising a ball race with radially inner and outer raceways. If a radially outer raceway is provided it is secured to an anchorage, such as a housing. A layer of dry bearing material is secured to rotate with each raceway to be rotated by the shaft, the dry bearing material having a surface opposite to the shaft. After any failure of the magnetic bearing the shaft is contacted by the layer of dry bearing material, and the rolling elements are brought up to speed at a slower rate than otherwise would be the case, because of slipping of the shaft relative to the dry bearing material. By the time the back-up bearing is rotating at the same speed as the shaft, the back-up bearing is rotating at a speed not significantly greater than the maximum design speed for the rolling elements.
REFERENCES:
patent: 3642331 (1972-02-01), Silver
patent: 4525083 (1985-06-01), Pederson
patent: 4582368 (1986-04-01), Fujita et al.
patent: 4629261 (1986-12-01), Eiermann et al.
patent: 4848934 (1989-07-01), Blakely et al.
patent: 4982126 (1991-01-01), Jolivet et al.
patent: 5059845 (1991-10-01), Wilson
LaBalle C.
Stephan Steven L.
The Glacier Metal Company Limited
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