Bistable linear electromagnet

Patent metadata

Field	Value
Publication number	US-10176915-B2
Application number	US-201715638512-A
Country	US
Kind code	B2
Filing date	Jun 30, 2017
Priority date	Jul 1, 2016
Publication date	Jan 8, 2019
Grant date	Jan 8, 2019

Abstract

A bistable linear electromagnet comprising a first housing (10) and a second housing (11) in alignment, a movable armature (18) comprising a rod (19) and a shuttle (20) that is slidably mounted, and a first coil (13) positioned in the first housing and a second coil (15) positioned in the second housing. A cavity (25) is made in a measurement wall (4) of one of the housings, and the electromagnet comprises a magnetic field sensor (26) positioned in the cavity and designed to measure a magnetic flux existing in a magnetic path formed by the walls of said housing and by the shuttle, in order to detect whether the shuttle has moved towards or away from the abutment wall of said first or second housing.

First claim

The invention claimed is:

1. A bistable linear electromagnet comprising a hollow body ( 2 ) with walls defining a first housing ( 10 ) and a second housing ( 11 ) aligned along an axis X, a movable armature ( 18 ) comprising a rod ( 19 ) linked to a shuttle ( 20 ) mounted to slide in the hollow body ( 2 ) along the axis X between a first end position in which the shuttle comes into abutment against a first abutment wall ( 7 ) of the first housing ( 10 ) and a second end position in which the shuttle comes into abutment against a second abutment wall ( 8 ) of the second housing ( 11 ), and a first coil ( 13 ) positioned in the first housing and a second coil ( 15 ) positioned in the second housing, in such a manner that the shuttle slides towards the first end position when a first current flows in the first coil and in the second coil, and in such a manner that the shuttle slides towards the second end position when a second current flows in the first coil and in the second coil, the electromagnet being characterized in that a cavity ( 25 ) is made in a measurement wall ( 4 ) of one of the first or second housings, and in that the electromagnet includes a magnetic field sensor ( 26 ) positioned in the cavity and designed for measuring a magnetic flux existing in a magnetic path formed by the walls of said first or second housing and by the shuttle, in order to detect whether the shuttle has moved towards or away from the abutment wall of said first or second housing.

2. An electromagnet according to claim 1 , wherein the first housing ( 10 ) and the second housing ( 11 ) are separated by a wall ( 6 ) of the hollow body ( 2 ) and by a permanent magnet ( 12 ).

3. An electromagnet according to claim 1 , wherein the cavity ( 25 ) opens out to the outside of the hollow body.

4. An electromagnet according to claim 3 , wherein the measurement wall ( 4 ) presents, at the cavity, a thickness lying in the range 0.4 mm to 10 mm.

5. An electromagnet according to claim 1 , wherein the hollow body ( 2 ) is made of martensitic stainless steel.

6. An electromagnet according to claim 1 , wherein the shuttle ( 20 ) is made of martensitic stainless steel.

7. An electromagnet according to claim 1 , wherein the rod ( 19 ) is made of aluminum.

Assignees

• Safran Landing Systems

Inventors

• Durand Guillaume
• Coustenoble Steve
• Monsaint Laurent

Classifications

• H01F2007/1692

  Electromagnets or actuators with two coils · CPC title

• H01F2007/1669

  Armatures actuated by current pulse, e.g. bistable actuators · CPC title

• H01F7/17

  Pivoting and rectilinearly-movable armatures · CPC title

• H01F7/1872 Primary

  Bistable or bidirectional current devices (relays H01H47/226) · CPC title

• H01F2007/1684

  Armature position measurement using coils · CPC title