|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||416/147 ; 416/159 ; 416/162 ; 318/722|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 67 인용 특허 : 0|
Blade pitch of variable pitch blades is changed by an actuator having first and second ac machines. The first ac machine is excited with ac power to apply a motoring torque to a control shaft of the actuator, thereby causing blade pitch to change in one direction. The second ac machine is excited with appropriate power to apply a braking torque to the control shaft, thereby causing blade pitch to change in an opposite direction. When the second ac machine is an induction machine, dc excitation will brake the control shaft. When the second ac machine is a...
Apparatus for torquing a control shaft of a blade pitch actuator for variable-pitch blades, comprising: means for providing a first excitation when blade pitch is to be changed in one direction and for providing a second excitation when blade pitch is to be changed in an opposite direction; a first ac machine for applying a motoring torque to said control shaft in response to said first excitation; and a second ac machine for applying a braking torque to said control shaft in response to said second excitation. A method of torquing a control shaft of a b...