Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1992-03-26
1993-04-13
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 91, 310156, H02K 709
Patent
active
052025985
ABSTRACT:
The disadvantage of complexity and size in back up bearings for permanent magnet biased magnetic bearings is avoided in a construction including a rotor (10) formed at least in part of magnetic material, at least two diametrically opposite magnetic poles (32, 34; 36, 38) about the rotor and terminating in ends slightly spaced therefrom to define a first gap (G.sub.1), and electrical windings (42, 43) associated with each pole (32, 34, 36, 38). A collar (46) of magnetic material is axially spaced from the poles (32, 34, 36, 38) and has an opening (48) receiving the rotor (10) such that a small peripheral space exists between the opening (48) and the rotor (10). An array (44) of permanent magnets (45) is located in magnetic conducting relation with the collar (46) and the poles (32, 34, 36, 38) and a sleeve (50) of bearing material is disposed in the peripheral space and carried by the collar (46) to be spaced from the rotor (10) by a small gap (G.sub.2).
REFERENCES:
patent: 4597613 (1986-07-01), Sudo
patent: 4983869 (1991-01-01), Vaidya et al.
patent: 4983870 (1991-01-01), McSparran
patent: 5111102 (1992-05-01), Meeks
Nguyen Matthew
Stephan Steven L.
Sundstrand Corporation
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