公开(公告)号：GB2285098A

公开(公告)日：1995-06-28

申请号：GB9424001

申请日：1994-11-28

Applicant: UNITED TECHNOLOGIES CORP

Inventor： CARVALHO PAUL A ,  GAMES JOHN E ,  BONNANZIO RICHARD L

IPC: B64C11/44 ,  F04D29/32 ,  F04D27/00

Abstract: Pitch change for a variable pitch propeller or fan of the type utilized in a gas turbine engine is effected by the application of a bidirectional electrical induction AC motor 62 and an electrical DC induction brake 64 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 limitations on the gear ratio. Pitch change is effected via a ball screw 24.

公开(公告)号：GB2313415B

公开(公告)日：1998-05-20

申请号：GB9713488

申请日：1994-11-28

Applicant: UNITED TECHNOLOGIES CORP

Inventor： CARVALHO PAUL A ,  GAMES JOHN E

IPC: B64C11/44 ,  F04D29/32 ,  F04D27/00

公开(公告)号：GB2285098B

公开(公告)日：1998-05-20

申请号：GB9424001

申请日：1994-11-28

Applicant: UNITED TECHNOLOGIES CORP

Inventor： CARVALHO PAUL A ,  GAMES JOHN E ,  BONNANZIO RICHARD L

IPC: B64C11/44 ,  F04D29/32 ,  F04D27/00

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.

公开(公告)号：GB2313415A

公开(公告)日：1997-11-26

申请号：GB9713488

申请日：1994-11-28

Applicant: UNITED TECHNOLOGIES CORP

Inventor： CARVALHO PAUL A ,  GAMES JOHN E

IPC: B64C11/44 ,  F04D29/32 ,  F04D27/00

Abstract: Pitch change of a propeller or fan is effected by means of a DC induction brake 64 and a bidirectional AC induction motor 62, pitch change drive being transmitted to the blades 18, via a ball screw 26. At relatively low speeds of propeller/fan rotation control means 80, receiving inputs from a lever 82, sequentially controls the brake and the motor to increase pitch at a relatively high beta rate, while at relatively high speeds of rotation, the brake is controlled to increase pitch at a relatively low beta rate. Pitch is decreased at low speeds of rotation by the motor, and at high speeds of rotation by the motor or brake or a combination of the two. The motor can be used in a slip speed range from positive through zero to negative slip speeds.