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Compensation actuator for a rotorcraft flight control

  • US 7,969,110 B2
  • Filed: 09/08/2008
  • Issued: 06/28/2011
  • Est. Priority Date: 09/07/2007
  • Status: Expired due to Fees
First Claim
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1. An actuator comprising:

  • an auto-synchronous rotary electric motor;

    a reversible speed-reducing gearbox coupled to the motor to be driven in rotation thereby;

    an outlet shaft coupled to the speed-reducing gearbox to be driven in rotation thereby;

    a member responsive to the opposing torque transmitted by the outlet shaft, the member being interposed between and coupled to rotate with the outlet shaft and the speed-reducing gearbox, the member comprising a deformable structure that is deformable by twisting;

    two angular position sensors responsive to the angular position of the deformable structure and disposed at opposite ends of the deformable structure, the first angular position sensor responsive to an angular position of the outlet shaft; and

    a control circuit connected to the two angular position sensors and to the motor, said circuit delivering a motor power supply signal that varies as a function of a position setpoint signal applied to the control circuit and as a function of signals delivered by the angular position sensor, and the control circuit arranged to determine an opposing torque value as a function of the signals delivered by the two angular position sensors and as a function of a twisting stiffness of the deformable structure;

    wherein the gearbox comprises a plurality of speed-reducing stages each stage comprising a pair of gears, the gears being mounted to rotate on two parallel axes of rotation, and wherein said motor comprising a rotor cage, said actuator is provided with a brake lining and with an electromagnetic field winding which is able to engage or disengage said brake lining against said rotary cage, andwherein the deformable structure comprises a helical spring, two parallel plates connected to the ends of the helical spring, a first finger connecting the two parallel plates and the helical spring to the gearbox, and a second finger connecting the two parallel plates and the helical spring to the outlet shaft of the actuator.

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