Vibration isolated backup bearing for magnetic bearing

Details Vibration isolated backup bearing for magnetic bearing Vibration isolated backup bearing for magnetic bearing

1992-02-03

1993-07-27

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 90, H02K 709, H02K 708

Patent

active

052313239

ABSTRACT:
An assembly in which a rotating shaft is supported by a magnetic bearing has a backup bearing to support the shaft in the event of failure of the magnetic bearing. If the bearing portion of the backup bearing comprises a ball race, the radially outer raceway thereof is secured to an anchorage, such as a housing for the assembly. A low stiffness damper member in the form of an annular shaped body of resilient material also is included in the backup bearing, between the bearing portion thereof and the anchorage. Advantageously, when the magnetic bearing has failed, and the shaft is being brought to rest by being in contact with the backup bearing, the resilient body is in shear, and the body has a lower stiffness than otherwise would be the case. Thus, any tendency for the backup bearing, and/or the anchorage, to be damaged while the shaft is being brought to rest, is reduced, because the provision of the low stiffness damper causes the shaft to have a low natural frequency of oscillation.

REFERENCES:
patent: 4601591 (1986-07-01), Wright
patent: 5021697 (1991-06-01), Kralick
patent: 5059845 (1991-10-01), Wilson

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