Flight control surface actuator for use on transport aircraft includes vibration type motor, with compensating secondary actuator maintaining average force

摘要

The actuator for a flight control surface (7) comprises a main control path (1) and a compensating secondary control path (2). The compensating actuator tensions or compresses a spring in order to maintain a specific average control force during operation of the control. The actuator for a flight control surface for control aircraft primary flight comprises a main control path with a main actuator (3). The actuator of the main control path comprises a vibration type motor. There is also a compensating secondary control path with a compensating actuator (4) and a spring (5) interposed between the compensating actuator and the flight control surface. The compensating actuator tensions or compresses the spring in order to provide the flight control surface with an average force for discharging the main actuator of the average force which is must apply to the flight control surface. The compensating actuator may also comprise a vibration type motor, and operates to provide a non-null average force during a time interval of between one and twenty seconds.