Abstract: A MEMS type inertial sensor comprising a support structure having at least a first seismic body and a second seismic body connected thereto by resilient means in order to be movable in a suspension plane, transducers for maintaining the seismic bodies in vibration and for determining movements of the seismic bodies in the suspension plane, and a control unit connected to the transducers by electrical conductor means. The transducers comprise at least one electrode secured to the first seismic body and at least one electrode secured to the second seismic body, the two electrodes being arranged to enable relative movements of the seismic bodies relative to each other in the suspension plane to be measured directly.
Abstract: An aeroengine control device including a mount and having pivotally mounted thereon a code wheel together with a main lever and a secondary lever, both for turning the code wheel. Each lever is movable between a rest position and a maximum actuation position. The secondary lever is mounted to pivot on the main lever. Cam paths are mounted on the code wheel and on the mount in such a manner that the main lever can move the code wheel when the main lever is moved while the secondary lever is in the rest position. The secondary lever can move the code wheel when the secondary lever is moved while the main lever is in the rest position, with movement of either lever being prevented when the other lever is clearly away from its rest position.
Abstract: An electronics module comprising a box including at least one pair of slideways to define a housing for receiving an electronics card, the slideways being fastened to two opposite faces of the box that are provided with ventilation means arranged to establish a flow of a total stream of air between the two faces. According to the invention, the electronics module includes at least one screen arranged in the housing between one of the slideways and the associated electronics card in order to define a passage for an individual stream of air in the housing.
Type:
Grant
Filed:
October 6, 2011
Date of Patent:
July 4, 2017
Assignee:
Safran Electronics & Defense
Inventors:
Etienne Merlet, Jean-Marie Courteille, Jean-Eric Besold, Marie-Noël Besold, Aurélie Besold, Stéphanie Besold, Antoine Besold
Abstract: The invention relates to an on-board assembly for producing and storing electricity, including at least one hydrogenerator having an output line connected to at least one electrical battery having predetermined electrical load parameters. The hydrogenerator includes a load-bearing structure onto which a generator and an impeller, secured to a shaft for driving a rotor of the generator, are mounted. Said assembly is characterized in that the generator is an excitation generator, and the hydrogenerator includes a rectifier circuit, connecting the generator to the output line, and at least one circuit for exciting the generator. The excitation circuit is connected to an excitation current regulator controlled by a control unit set up so that the generator provides a load current consistent with the electrical load parameters on the basis of a resisting torque of the generator, said torque being predetermined so as to limit drag of the impeller.
Abstract: The invention relates to a vibrating MEMS inertial angular sensor including a substrate for supporting at least two mass bodies mounted to bear mobile relative to the substrate and associated with at least one electrostatic actuator and at least one electrostatic detector. The sensor includes first means for suspending the mass bodies relative to the substrate and means for coupling the mass bodies together. The substrate is connected to a stationary rack by second suspension means.
Abstract: A method for controlling a piezoelectric device including a piezoelectric element attached to a substrate, with the substrate and the piezoelectric element being made of materials having different coefficients of thermal expansion includes the step of subjecting the piezoelectric element to a predetermined electric voltage in order to cause a predetermined set deformation of the piezoelectric element. The predetermined electric voltage comprises a compensation portion determined according to ambient temperature to cancel a stress generated on the piezoelectric element due to a differential thermal expansion between the piezoelectric element and the substrate.
Abstract: An inertial sensor comprising a frame to which at least two seismic bodies are connected by resilient means so as to be movable in a suspension plane, and transducers to keep the seismic bodies vibrating and to determine a relative movement of the seismic bodies relative to one another, characterized in that the seismic bodies have a single shape and a single mass, and in that the seismic bodies comprise interlocking parts such that the seismic bodies are nested inside one another while being movable in the suspension plane relative to the other of the seismic bodies, with the seismic bodies having centers of gravity that coincide with one another. A method for manufacturing such a sensor.
Abstract: The invention concerns a method for detecting a failure in a three-phase alternator connected to a three-phase rectifier bridge. The method comprises the following steps — rectifying (70) the voltages generated by the three-phase alternator; — adding (76) the rectified voltages taken at the first and second phases in order to obtain a voltage sum; — subtracting (78), from said voltage sum, twice the rectified voltage taken at the third phase, in order to obtain a voltage difference; — comparing (80) the voltage difference to a high threshold and a low threshold; — detecting (82) a failure when the voltage difference is less than said low threshold or when the voltage difference is greater than said high threshold. The invention also concerns a device for detecting failures and an associated computer programme.