Pitch variation control device for the blades of a turbomachine

Details Pitch variation control device for the blades of a turbomachine Pitch variation control device for the blades of a turbomachine

1996-04-04

1997-01-21

Larson, James

Fluid reaction surfaces (i.e., impellers)

Method of operation

416153, 416162, B64C 1144

Patent

active

055954740

ABSTRACT:
A device for controlling the pitch of the blades of a turbomachine rotor includes an electric motor having a stator which is stationary and a rotor, preferably of the permanent magnet or asynchronous kind, which is mounted on the turbomachine shaft and is rigidly secured to a toothed wheel meshing with pinion sectors rigidly secured to the roots of the blades, and a mechanism for locking the blade roots in position which includes an electromechanical actuator rigidly secured to the shaft and electrically powered by a rotary transformer.

REFERENCES:
patent: 2370135 (1945-02-01), Berliner
patent: 2612228 (1952-09-01), Forsyth
patent: 2632516 (1953-03-01), Longfellow
patent: 3044558 (1962-07-01), Tiedeman
patent: 3900274 (1975-08-01), Johnston et al.
patent: 4591313 (1986-05-01), Miyatake et al.
patent: 5183387 (1993-02-01), Huggett et al.
patent: 5205712 (1993-04-01), Hamilton
patent: 5281094 (1994-01-01), McCarty et al.
patent: 5282719 (1994-02-01), McCarty et al.
patent: 5451141 (1995-09-01), Carvalho et al.
patent: 5451856 (1995-09-01), Girard et al.

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