Electromagnetic contactor

Patent metadata

Field	Value
Publication number	US-2024412932-A1
Application number	US-202418643055-A
Country	US
Kind code	A1
Filing date	Apr 23, 2024
Priority date	Jun 9, 2023
Publication date	Dec 12, 2024
Grant date	—

Abstract

To more effectively prevent separation of a contact unit at the time of short-circuit in an electromagnetic contactor. A capsule case is made of resin. A fixed yoke is arranged between a pair of fixed contact pieces, and at least a portion of the fixed yoke is held in a skeleton forming a capsule case. A movable yoke is disposed on a movable contact piece and is opposed to the fixed yoke. The fixed yoke and the movable yoke attract each other caused by a magnetic circuit being formed about an axis in a conduction direction in which current flows in the movable contact piece when a contact unit is closed.

First claim

1 . An electromagnetic contactor comprising:
a container made of resin; a pair of fixed contact pieces fixed to the container in a penetrating manner and on one end side of each of which, the one end side being located inside the container, a fixed contact is formed; a movable contact piece on both end sides of which movable contacts facing the fixed contacts are formed, the movable contact piece being configured to, when the movable contact piece is displaced in a depth direction in the container, cause a contact unit including the movable contacts and the fixed contacts to be opened or closed; a fixed yoke arranged between the pair of fixed contact pieces and at least a portion of which is held in a skeleton forming the container; and a movable yoke disposed on the movable contact piece and opposed to the fixed yoke, wherein the fixed yoke and the movable yoke attract each other caused by a magnetic circuit being formed about an axis in a conduction direction in which current flows in the movable contact piece when the contact unit is closed.

2 . The electromagnetic contactor according to claim 1 , wherein on the skeleton, an opening portion to cause a portion of the fixed yoke to be exposed is formed.

3 . The electromagnetic contactor according to claim 2 , wherein
the fixed yoke is formed in a flat plate shape extending in a direction orthogonal to the movable contact piece when viewed from a depth direction and includes: an embedded portion embedded in the skeleton; and an exposed portion projecting from the opening portion.

4 . The electromagnetic contactor according to claim 3 , wherein the embedded portion is larger than the opening portion when viewed from a projecting direction of the exposed portion.

5 . The electromagnetic contactor according to claim 3 , wherein the fixed yoke has the embedded portion closely adhering to an inner surface of the skeleton.

6 . The electromagnetic contactor according to claim 3 , wherein the movable yoke is formed in a U-shape opening to the fixed yoke when the movable contact piece is viewed from a conduction direction.

7 . The electromagnetic contactor according to claim 1 , wherein to the container, gas barrier coating is applied using laminated films of clay crystals.

8 . The electromagnetic contactor according to claim 1 , wherein the fixed yoke is internally integrated with the skeleton by insert molding.

Assignees

• Fuji Electric Co Ltd

Inventors

• KONISHI Koujun
• Tsutsumi Takashi
• Sakurai Yuya
• Kusano Yuma

Classifications

• H01H51/2209

  with rectilinearly movable armature · CPC title

• H01H50/42

  Auxiliary magnetic circuits, e.g. for maintaining armature in, or returning armature to, position of rest, for damping or accelerating movement · CPC title

• H01H50/20

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

• H01H50/36 Primary

  Stationary parts of magnetic circuit, e.g. yoke · CPC title

• H01H9/443

  using permanent magnets · CPC title