Electromagnetic actuator and electrical switching unit including this actuator

Patent metadata

Field	Value
Publication number	US-11501940-B2
Application number	US-201916456720-A
Country	US
Kind code	B2
Filing date	Jun 28, 2019
Priority date	Aug 1, 2018
Publication date	Nov 15, 2022
Grant date	Nov 15, 2022

Abstract

An electromagnetic actuator includes a fixed body, a moving part forming a magnetic core of the actuator and being movable in translation with respect to the fixed body between a retracted position and a deployed position, a magnetic piece forming a permanent magnet adjusted to generate a first magnetic force holding the moving part in the retracted position, and a coil adjusted to engender a second magnetic force opposed to the first magnetic force when the coil is supplied with an electrical excitation current. The moving part includes one or more notches formed in a body of the moving part.

First claim

The invention claimed is:

1. An electromagnetic actuator, comprising:
a fixed body;
a moving part configured to form a magnetic core of the actuator and to move with respect to the fixed body between a retracted position and a deployed position, the moving part having a circular cross-section and one or more notches, the one or more notches not being radial and having a constant width;
a magnetic piece configured to form a permanent magnet that generates a first magnetic force to hold the moving part in the retracted position; and
a coil configured to generate a second magnetic force opposed to the first magnetic force when the coil is supplied with an electrical excitation current.

2. The electromagnetic actuator according to claim 1 , wherein the moving part is made of an iron-silicon alloy.

3. The electromagnetic actuator according to claim 2 , wherein a mass concentration of silicon in the iron-silicon alloy is greater than or equal to 2% and less than or equal to 6.5%.

4. The electromagnetic actuator according to claim 2 , wherein the moving part is manufactured according to a metal injection moulding method.

5. The electromagnetic actuator according to claim 1 , wherein the one or more notches include between 1 and 10 notches.

6. The electromagnetic actuator according to claim 1 , wherein a radius of the moving part is greater than or equal to 3 mm and less than or equal to 10 mm, and a length of the one or more notches is greater than or equal to 30% of the radius and less than or equal to 90% of the radius.

7. The electromagnetic actuator according to claim 1 , wherein the one or more notches are disposed either side of a central geometric plane of the magnetic piece and are aligned perpendicular to the central geometric plane.

8. An electrical switching device including a switching mechanism and an electromagnetic actuator coupled to the switching mechanism, wherein the electromagnetic actuator is according to claim 1 .

9. The electromagnetic actuator according to claim 3 , wherein, the mass concentration of silicon in the iron-silicon alloy is greater than or equal to 2.5% and less than or equal to 3.5%.

10. The electromagnetic actuator according to claim 5 , wherein the one or more notches include 4 notches.

Assignees

• Schneider Electric Ind Sas

Inventors

• Orban Remy
• Theron Olivier
• Buffat Sebastien

Classifications

• H01F2007/086

  Structural details of the armature · CPC title

• H01H71/322

  with plunger type armature · CPC title

• H01H50/20

  movable inside coil and substantially lengthwise with respect to axis thereof; movable coaxially with respect to coil · CPC title

• H01F7/1615 Primary

  Armatures or stationary parts of magnetic circuit having permanent magnet · CPC title

• H01H71/24

  Electromagnetic mechanisms · CPC title