Propeller pitch change machanism with inductive brake and motor

Details Propeller pitch change machanism with inductive brake and motor Propeller pitch change machanism with inductive brake and motor

1993-12-23

1995-09-19

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

Having positive means for impeller adjustment

Power derived from impeller shaft

416162, 416165, B64C 1144

Patent

active

054511410

ABSTRACT:
Pitch change for a variable pitch propeller or fan of the type utilized in a gas turbine engine is effectuated by the unique application of a bidirectional electrical induction AC motor and an electrical DC induction brake operatively connected to the pitch change actuator. The motor can be utilized in a slip speed range encompassing from a positive slip speed to zero slip speed and negative slip speeds which removes the limitations on the gear ratio.

REFERENCES:
patent: 2620887 (1952-12-01), Tiedeman et al.
patent: 5183387 (1993-02-01), Huggett et al.
patent: 5199850 (1993-04-01), Carvalho et al.
patent: 5205712 (1993-04-01), Hamilton
patent: 5281094 (1994-01-01), McCarthy et al.
patent: 5282719 (1994-02-01), McCarthy et al.

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