Electromagnetic device and electromagnetic relay equipped with electromagnetic device

Patent metadata

Field	Value
Publication number	US-10446350-B2
Application number	US-201715619885-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 configured to generate a first magnetic flux; 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 configured to generate a second magnetic flux between the respective opposed surfaces of the fixed member and the movable member in the same direction as the first magnetic flux. The permanent magnet is attached to at least one of the fixed member and the movable member such that a magnetized surface of the permanent magnet is opposed and exposed to the opposed surface of the other one of the fixed member and the movable member.

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 between opposed surfaces of the fixed member and the movable member in a direction conforming to the first magnetic flux, the opposed surface of the fixed member and the opposed surface of the movable member are opposed in a reciprocating direction of the movable member,
wherein the permanent magnet is attached to at least one of the fixed member and the movable member such that a magnetized surface of the permanent magnet is opposed and exposed to the opposed surface of the other one 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 the permanent magnet is formed into a ring-like shape.

6. The electromagnetic device according to claim 1 , wherein the magnetized surface of the permanent magnet is on a plane identical to the opposed surface of the at least one of the fixed member and the movable member to which the permanent magnet is attached.

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

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Sakai Satoshi
• Uruma Katsuya

Classifications

• H01H51/27

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

• H01H50/163

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

• H01H50/36

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

• H01H50/44

  Magnetic coils or windings · CPC title

• H01H50/20 Primary

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