Moving Magnet Technologies (mmt)

Sonceboz Sa

Logitech Europe S.a.

Moving Magnet Technologies

Sonceboz Automative Sa

Guillaume Loussert

Daniel Prudham

Stéphane Biwersi

Javier Rios-Quesada

Pierre Gandel

Michaël Delbaere

Gaël Andrieux

Jean-Daniel Alzingre

Martin Strahm

Richard Arlot

Guillaume Keltz

Corentin Le Denmat

Michaél Delbaere

Michael Delbaere

Michael Geiser

An actuator for controlling the movement of an element between two stable positions with pulsed electrical control without a change in polarity comprises: a ferromagnetic mobile mass, at least one electrically controlled wire coil that is fixed with respect to the mobile mass, at least two ferromagnetic poles that are fixed with respect to the mobile mass and on either side of the mobile mass. The actuator comprises at least one permanent magnet that attracts the mobile mass in order to achieve the two stable positions. The mobile mass defines, with the ferromagnetic poles, at least two variable air gaps during the movement of the mobile apparatus. The magnetic flux of the permanent magnet opposes the magnetic flux generated by the at least one coil regardless of the position of the mobile mass.

Ballistic unipolar bistable actuator

A rotary actuator with a moving frame includes an electrical coil that moves on an angular travel about an axis of rotation A, the shape of the coil being an elliptical cylinder and the axis of winding B being orthogonal to the axis of rotation A, the coil being placed in the magnetic field of a fixed magnet. The fixed magnet surrounds the coil and includes two semicylindrical portions, the generatrices of which are orthogonal to the axis of rotation A, the first of the semicylindrical portions having a north pole directed toward the coil, orthogonally to the direction of the generatrices and being positioned outside the coil, the second having a south pole directed toward the coil, orthogonally to the direction of the generatrices and also being positioned outside the coil opposite the first portion. The actuator includes a ferromagnetic core inside the coil and an outer ferromagnetic yoke surrounding the fixed magnet, the coil moving in the air gap formed between the magnetized semicylindrical portions and the inner core.

Actuator with moving coil frame and enhanced dynamics

Electric actuator

Electric rotary actuator

A user input device including a rotary input control having a wheel and an electropermanent magnet (EPM) assembly, the EPM assembly comprising a permanent magnet and a magnetizing assembly configured to control a polarization of the permanent magnet to transition the electropermanent magnet assembly from a first state in which the EPM assembly applies a first resistance profile to the wheel and a second state in which the EPM assembly applies a second resistance profile to the wheel. The EPM assembly includes magnetically conductive members positioned at opposing ends of the electropermanent magnet, each magnetically conductive member comprising a respective plurality of teeth protruding radially toward the wheel, and each of the magnetically conductive members comprising a respective magnetic pole depending on a polarized state of the EPM assembly.

Electromagnetic mode change of peripheral interface wheel

A linear electromagnetic actuator has a stroke c, with at least one stable position in one of the ends of the stroke, and includes: an armature made of a soft magnetic material, the armature being movable in an axial direction Y and having a length Hm in the direction Y, the armature having a symmetrical shape at the axis Y, and a stationary stator yoke made of a soft magnetic material and holding at least one electric coil. The actuator also includes at least one stationary permanent magnet that is magnetized along a transverse axis X perpendicular to the direction Y. The magnet is transversely placed between the movable armature and the electric coil. The magnet has a length Ha in the direction Y. The stationary yoke and the movable armature define therebetween at least one axial air gap. Ha+c is of the order of magnitude of Hm. The length Hm is such that 0.9&#xd7;(Ha+c)&#x3c;Hm&#x3c;1.1&#xd7;(Ha+c) so that, when the movable armature is in the end stability position thereof, one of the two axial ends of the movable armature is adjacent to one of the two axial ends of the permanent magnet.

Linear actuator with improved magnetic stability and stripping force

A positioning assembly includes a position sensor and a magnetic actuator, the actuator including a stator assembly formed of at least one ferromagnetic stator bearing at least one electric power supply coil and a yoke able to move relative to the stator assembly, the actuator having a geometry that is of revolution or periodic about an axis referred to as the main axis passing through the yoke, the sensor having at least one permanent magnet secured to the yoke and at least one magneto-sensitive probe that is fixed in relation to the magnet and able to measure the amplitude or direction of the magnetic field emitted by the magnet. The yoke has an interior recess including the main axis of the actuator, and the magnet is positioned inside the recess and secured to the yoke.

Compact positioning assembly comprising an actuator and a sensor built into the yoke of the actuator

A linear electromagnetic actuator includes a stator excited by at least one electric coil arranged around an axis of symmetry and two ferromagnetic stator poles positioned axially on either side of the coil, as well as at least two independent moving members, each of the moving members being formed of a ferromagnetic material, where the linear electromagnetic actuator includes at least three magnetized poles arranged inside the coil, with respectively a first magnetized pole positioned in the vicinity of the median plane separating the two moving members and containing the axis of the coil, and a second and third magnetized pole arranged laterally on either side of the moving members, between the moving members and the coil.

Linear electromagnetic actuator comprising two independent moving members

The present disclosure relates to an electromagnetic actuator of the type producing a force due to the current that remains substantially constant over the entirety of its useful travel Y and that has a low force in the absence of current, including at least one stator structure, at least one electrical supply coil, and a moving member, the stator structure having, on the one hand, a central pole running perpendicular to the direction of the travel Y and having a width Yin the direction of the travel and terminating at its end in a width Ythat is greater than or equal to the travel Y of the moving member, Ybeing greater than Y, and, on the other hand, two lateral poles having widths Yin the direction of the travel and terminating at their end in a width Ygreater than Y.

Compact direct-drive actuator generating a constant force

An electromagnetic actuator includes a stator unit having N poles having the width LP, and at least one coil surrounding one of the poles, wherein N&#x2266;3, and a magnetic portion, which is movable, relative to the stator unit, in a direction of relative movement and over a course of travel C, and including N+1 magnetized areas, the magnetizations of which are perpendicular to the relative movement direction and in alternate directions. The magnetic portion includes a yoke for closing off the magnetic fluxes passing through the magnetized areas, the course of travel C of the magnetic portion being less than or equal to the width LP of each pole, and the thickness of the magnetized areas perpendicular to the direction of movement being less than the course of travel C of the magnetic portion.

Electromagnetic actuator having improved force density and use thereof for an electric razor

A single phase electromagnetic servo-actuator that includes a rotary actuator which moves a mobile member along a limited travel including a 2N ferromagnetic pole stator structure and at least one excitation coil, the stator structure being made of a material with high magnetic permeability and a rotor having ferromagnetic yoke and a thin magnetized portion of 2N pairs of axially magnetized poles, in alternate directions, and a rotor angular position sensor, the thin magnetized portion being a separate element from the ferromagnetic yoke.

Rotary single-phase electromagnetic servo actuator comprising an actuator and a position sensor

The present invention relates to a dashboard indicator module comprising, in a casing, a rotary motor, an output shaft, mechanical reduction device associated with the motor, at least one electrical supply coil, electrical connection tabs linked to the coils leaving the casing and electrical contact elements, characterized in that the electrical contact elements can be fitted on the connection tabs in order to produce solderless connectors on the printed circuit or even removed from the connection tabs in order to allow the connection tabs of the motor to be soldered directly to the printed circuit.

Dashboard indicator module formed by a motor and electrical connection means

The invention concerns a rotary single-phase electromagnetic servo actuator consisting of a rotary actuator designed to move a mobile member along a limited travel, including a 2N pole stator structure, N being equal to 1 or 2, and at least one field coil, said stator structure being made of a material with high magnetic permeability, and a rotor having a ferromagnetic yoke and a thin magnetized portion consisting of 2N pairs of axially magnetized poles, in alternate directions and a rotor angular position sensor. The invention is characterized in that the position sensor has a magnetic field emitter integral with the yoke and a receiver for the magnetic field stationary relative to the stator structure.

Growing community of inventors

Besançon, France

Guillaume Loussert