Moving Magnet Technologies (mmt)

Moving Magnet Technologies

Javier Rios-Quesada

Guillaume Loussert

Michaël Delbaere

Stéphane Biwersi

Gaël Andrieux

Michael Delbaere

Pascal Thibaut

Gaëtan Riou

Michaél Delbaere

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.

Growing community of inventors

Besançon, France

Javier Rios-Quesada