Patent ID: 9046188
Filing Date: 2015-06-02
Classification: F16K,H01F

Abstract:
1. An electromagnetic actuator comprising: a plunger made of ferromagnetic material, able to move in translation in a given direction; a sleeve surrounding the plunger and extending in the direction of translation of the plunger; a solenoid device positioned around the sleeve, suitable for generating a magnetic field; a casing made of ferromagnetic material surrounding the solenoid device, the casing being configured to guide the magnetic field towards the plunger and the sleeve; wherein the sleeve comprises a ferromagnetic material extending continuously over the length of at least one of the solenoid device and the plunger in at least one stable position of the plunger, so as to allow part of the magnetic field to pass along the sleeve in parallel to the plunger; and wherein the material of the sleeve has a saturation induction that is less than 80% of a saturation induction of the material of the plunger and the casing.