Patent ID: 9704635
Date: 2017-07-11
CPC Classifications: H01F

Claim:
1. An electromagnetic actuator comprising: a ferromagnetic housing extending in a longitudinal direction and having a height in a vertical direction that is perpendicular to the longitudinal direction; two electromagnetic coils positioned inside the housing and each comprising at least one winding around the longitudinal direction; a ferromagnetic unit arranged between the coils; a ferromagnetic plunger subjected to a magnetic field generated by the coils, the plunger being movable in the longitudinal direction and configured to be immobilized in three different longitudinal positions depending on the field generated by the coils; wherein the ferromagnetic unit is rigidly connected to the housing and has, in the vertical direction, a dimension that is greater than one sixth of the height of the housing, the ferromagnetic unit further being located at a distance that is less than one quarter of a gap in the longitudinal direction between the two coils, relative to a midplane that is perpendicular to the longitudinal direction and located midway between the two coils, to guide the magnetic flux produced by the coils to the housing, and wherein the ferromagnetic unit comprises at least one protrusion, each protrusion being at least partially in contact with the housing.