Moving Magnet Technologies (Mmt)

Sonceboz Sa

Moving Magnet Technologies

Richard Arlot

Nikola Jerance

Didier Frachon

Guillaume Loussert

Gérald Masson

Thierry Dorge

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

The invention relates to an angular or linear magnetic position sensor that comprises a mobile member including at least one magnet () having a magnetization direction that varies linearly along the movement direction of the magnet in a surface defined by said movement direction and in a normal direction, at least four magneto-sensitive elements (and) and at least one processing circuit () providing a signal based on the absolute position of the mobile member, characterized in that a first set of magneto-sensitive elements () and () are located at a same point, the first couple of magneto-sensitive elements () being spatially offset from a second couple of magneto-sensitive elements () along the movement direction, and in that the magneto-sensitive elements (and) measure the tangential component of the magnetic field while the magneto-sensitive elements (and) measure the normal component of the magnetic field in order to provide, after algebraic combination of the components taken in pairs, two sinusoidal signals substantially having an electrical phase shift of 90&#xb0;.

Angular or linear magnetic position sensor not sensitive to external fields

A magnetic sensor of rotary, linear, or curvilinear displacement using at least one permanent magnet and at least one magnetosensitive element, which can move with respect to one another. The magnet exhibits a direction of magnetization that varies continuously along the direction of displacement, with the exclusion of a diametral magnetization in the case of a rotary sensor.

Position sensor with variable direction of magnetization and method of production

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Bonnevent Velloreille, France

Richard Arlot