Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1994-02-15
1995-05-23
Dougherty, Thomas M.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 54, 310 58, 310119, 310 93, H02K 919, H02K 2368, H02K 710
Patent
active
054184126
ABSTRACT:
An electric generator of the type that is oil-cooled and generally used in aircraft includes a fluid brake assembly. The fluid brake assembly includes a fluid brake rotor which is generally in the form of a fan or impeller which is connected to the drive shaft of the generator. Under normal conditions with the cooling oil withdrawn from the housing of the generator by the scavenge system, the fluid brake rotor freely turns with the shaft. When the oil scavenge system becomes incapacitated, the generator becomes "flooded" and the fluid brake rotor acts as pump to try to pump the oil, creating a torque load on the drive shaft. This load is preferably greater than the shear strength of the shaft, causing the shaft to shear and disconnecting the generator from the aircraft engine. By shearing the drive shaft, the operation of the main engine is unaffected by the flooding of the generator, and serious failure of the aircraft engine is avoided.
REFERENCES:
patent: 2887593 (1959-05-01), Wiedemann
patent: 2941473 (1960-06-01), Lorenz
patent: 3089045 (1963-05-01), Derks
patent: 3525011 (1970-08-01), Erickson
patent: 3739208 (1973-06-01), Shartrand
patent: 3835919 (1974-09-01), Lambrecht et al.
patent: 4669999 (1987-06-01), Miller
patent: 4692280 (1990-06-01), Becker et al.
patent: 5034638 (1991-07-01), McCabria
Dougherty Thomas M.
LaBalle Clayton E.
Lucas Aerospace Power Equipment Corporation
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