Electromagnetic device and electromagnetic relay equipped with electromagnetic device

Patent metadata

Field	Value
Publication number	US-10446349-B2
Application number	US-201715619816-A
Country	US
Kind code	B2
Filing date	Jun 12, 2017
Priority date	Jun 17, 2016
Publication date	Oct 15, 2019
Grant date	Oct 15, 2019

Abstract

An electromagnetic device includes a coil, a fixed member, a movable member configured to reciprocate to separate from the fixed member by a predetermined gap when a current applied to the coil is stopped and move to the fixed member by an attractive force when the current is applied to the coil, and a permanent magnet. The permanent magnet is arranged at a position adjacent to the gap and separated from the fixed member and the movable member with a space interposed therebetween. A direction of a second magnetic flux generated by the permanent magnet conforms to a direction of a first magnetic flux generated between the respective opposed surfaces of the fixed member and the movable member when the current is applied to the coil.

First claim

The invention claimed is:

1. An electromagnetic device comprising:
a coil configured to generate a first magnetic flux when a current is applied thereto;
a fixed member through which the first magnetic flux flows;
a movable member configured to reciprocate to separate from the fixed member by a predetermined gap when the current applied to the coil is stopped and move to the fixed member by an attractive force when the current is applied to the coil; and
a permanent magnet configured to generate a second magnetic flux,
the movable member is configured to move relative to the permanent magnet,
the gap is formed between opposed surfaces of the fixed member and the movable member in a reciprocating direction of the movable member,
wherein the permanent magnet is arranged so that the permanent magnet is opposed to the gap in a direction perpendicular to the reciprocating direction of the movable member and separated from the fixed member and the movable member with a space interposed therebetween, and
a direction of the second magnetic flux conforms to a direction of the first magnetic flux between opposed surfaces of the fixed member and the movable member.

2. The electromagnetic device according to claim 1 , wherein the movable member is a movable iron core.

3. The electromagnetic device according to claim 1 , wherein the fixed member is a fixed iron core.

4. The electromagnetic device according to claim 1 , wherein the fixed member is a yoke arranged around the coil.

5. The electromagnetic device according to claim 1 , wherein a normal direction of at least one of a pair of magnetized surfaces of the permanent magnet conforms to the reciprocating direction of the movable member.

6. The electromagnetic device according to claim 1 , wherein at least one of a pair of magnetized surfaces of the permanent magnet extends in the reciprocating direction of the movable member.

7. The electromagnetic device according to claim 1 , wherein the permanent magnet is formed into a ring-like shape to surround the gap.

8. The electromagnetic device according to claim 1 , wherein the permanent magnet is arranged to overlap with at least one of the fixed member and the movable member as viewed in the direction perpendicular to a reciprocating direction of the movable member.

9. The electromagnetic device according to claim 1 , wherein a magnetic body is placed on at least one of a pair of magnetized surfaces of the permanent magnet.

10. The electromagnetic device according to claim 9 , wherein the magnetic body is arranged to overlap with the fixed member or the movable member located closer to the magnetic body as viewed in the direction perpendicular to the reciprocating direction of the movable member.

11. An electromagnetic relay equipped with the electromagnetic device according to claim 1 .

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Sakai Satoshi
• Uruma Katsuya

Classifications

• H01H51/2209

  with rectilinearly movable armature · CPC title

• H01H50/163

  Details concerning air-gaps, e.g. anti-remanence, damping, anti-corrosion · CPC title

• H01H51/065

  Relays having a pair of normally open contacts rigidly fixed to a magnetic core movable along the axis of a solenoid, e.g. relays for starting automobiles (details H01H50/20) · CPC title

• H01H50/42 Primary

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

• H01H51/27

  Relays with armature having two stable magnetic states and operated by change from one state to the other · CPC title