Centrifugal-effect vibration generator having coaxial contrarotating rotors
AssigneeEurocopter
InventorSylvain Clary
Life of this patent
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Abstract
A device for generating forces that are variable and controllable in amplitude, in direction, and in frequency, the device includes two unbalanced rotors (18, 20, 35 to 38) mounted coaxially in a casing (11). The device further includes electromagnetic drive elements for driving a first of the two rotors in rotation relative to the second of the two rotors, and brake elements (43 to 45) for braking the second rotor (20, 36, 38) relative to the casing.
Claims20
A device (10) for generating forces that are variable and controllable in frequency and in amplitude, the device comprising:
- two unbalanced rotors (18, 20, 35 to 38) mounted coaxially in a casing (11),
- electromagnetic drive means for driving a first of the two rotors in rotation from the second of the two rotors such that the rotors rotate in opposite directions,
- brake means (43 to 45) for braking the second rotor (20, 36, 38) relative to the casing,
- means for controlling the speed of the rotors in order to maintain their absolute speeds substantially identical, and
- unbalance weights or flyweights (37, 38) fitted to the rotors having the same static moment relative to the common axis of rotation and situated in or close to a common plane (39) that is orthogonal to one or both of the common axes of rotation (17) of the rotors.
A device, (10) for generating forces that are variable and controllable in frequency and in amplitude, the device comprising:
- two unbalanced rotors (18, 20, 35 to 38) mounted coaxially in a casing (11),
- electromagnetic drive means for driving a first of the two rotors in rotation from the second of the two rotors such that the rotors rotate in opposite directions,
- brake means (43 to 45) for braking the second rotor (20, 36, 38) relative to the casing, means for controlling the speed of the rotors in order to maintain their absolute speeds substantially identical, and two pairs of contrarotating and coaxial rotors, each pair of rotors comprising a said first rotor and a said second rotor constituting a moving stator for the first rotor.
A force generator device comprising two coaxial unbalanced rotors mounted in a casing, a first of the two rotors having a magnetic first circuit, and a second of the two rotors having an electromagnetic second circuit provided and arranged to co-operate with the magnetic first circuit and to drive the first rotor in rotation about the common axis of the rotors relative to the second rotor when the electromagnetic second circuit is powered, the device further comprising second-rotor brake means for braking the rotation of the second rotor relative to the casing, brake control means for controlling the speed and the phase of the rotation of the second rotor relative to the casing, and drive control means for controlling the speed and the phase of rotation of the first rotor relative to the second rotor or relative to the casing.
Dependencies are inferred from the claim text.