Centre National De La Recherche Scientifique

Peugeot Citroen Automobiles Sa

Cnrs

Borghi Saveri France

Hamid Ben Ahmed

Michel Lecrivain

Christophe Fageon

Emmanuel Sedda

Mohamed Gabsi

Daniel Drecq

Laurent Prevond

Jean Lucidarme

Mohamed Gasbi

Antoine Lesobre

The present invention pertains to an electromechanical actuator controlling a valve of an internal combustion engine by means of a first magnetic field, generated in a variable manner by an electromagnet, and a second magnetic field, generated by at least one magnet associated with the electromagnet. According to the present invention, the actuator is characterized in that it comprises at least one connecting part forming a magnetic circuit facilitating the passage of the flux generated by the electromagnet for part of the field generated by the magnet, the connecting part being magnetically saturated by the partial field of the magnet.

Electromagnetic actuator for controlling a valve of an internal combustion engine and internal combustion engine equipped with such an actuator

A valve actuator for internal combustion engines, includes at least one electromagnet and a magnetic plate, whose movement controls the displacement of the valve. The parameters of the electromagnet and of the plate are such that at least part of the magnetic circuit formed by the electromagnet and the magnetic plate is in a state of magnetic saturation when the magnetic plate is located in the proximity of the electromagnet. The magnetic circuit is preferably in the state of magnetic nonsaturation when it is located at a distance from the electromagnet. According to one embodiment, the magnetic plate has at least one contracted part intended to be saturated when this plate is located in the proximity of the electromagnet.

Electromechanical valve control actuator for internal combustion engines

A load machine for a combustion engine test bench includes at least one eddy-current brake associated with at least one electric drive. The brake includes a toothed ferromagnetic rotor secured to a shaft mounted so that it can rotate through a casing containing at least one induction coil borne by an internal peripheral region of the casing, so as to generate a magnetic field across which the rotor is intended to pass in order to generate eddy currents which brake the rotation of the shaft. The shaft is coupled to the combustion engine to be tested, and the electric drive is a variable-reluctance electric motor.

Load machine for a combustion engine test bench

A rotating electric machine whereof the rotor includes a magnetic core provided with radial teeth, uniformly distributed at its periphery, annular magnets arranged on either side of the core axial ends and magnetic end flanges pressing the annular magnets against the core, magnetic bars linking the end flanges together, housed in the spaces between the radial teeth, additional magnets being interposed between each of the bars and at least the side walls of the core radial teeth defining the spaces. The stator includes a magnetic core, excitation coils arranged on either side of the core, a stator coil wound on the core and a magnetic ring in contact with the core and provided with radial rims co-operating with the axial rims of the rotor end flanges to form paths for the return flux.

Rotating electric machine with improved double excitation

Growing community of inventors

Rennes, France

Hamid Ben Ahmed