Electromagnetic relay

Patent metadata

Field	Value
Publication number	US-10658141-B2
Application number	US-201715699397-A
Country	US
Kind code	B2
Filing date	Sep 8, 2017
Priority date	Oct 5, 2016
Publication date	May 19, 2020
Grant date	May 19, 2020

Abstract

An electromagnetic relay including: an electromagnet; a movable spring having a movable contact; a first terminal to which one end of the movable spring is connected; a second terminal having a fixed contact opposite to the movable contact; an actuator that rotates by excitation of the electromagnet, rotates the movable spring, and causes the movable contact to come in contact with the fixed contact or to separate from the fixed contact; a nonmagnetic card to be attached to the actuator; a plurality of magnetic members that sandwich the movable contact and the fixed contact, and apply a magnetic flux to the movable contact and the fixed contact to extend an arc; and a permanent magnet attached between the magnetic members.

First claim

What is claimed is:

1. An electromagnetic relay comprising:
an electromagnet;
a movable spring having a movable contact;
a first terminal to which one end of the movable spring is connected;
a second terminal having a fixed contact opposite to the movable contact;
an actuator that rotates by excitation of the electromagnet, rotates the movable spring, and causes the movable contact to come in contact with the fixed contact or to separate from the fixed contact;
a nonmagnetic card to be attached to the actuator;
a plurality of magnetic members that sandwich the movable contact and the fixed contact, and apply a magnetic flux to the movable contact and the fixed contact to extend an arc; and
a permanent magnet attached between the plurality of magnetic members.

2. The electromagnetic relay as claimed in claim 1 , wherein
the second terminal has a heat capacity larger than that of the movable spring, and a current flows from the movable contact to the fixed contact.

3. The electromagnetic relay as claimed in claim 1 , further comprising:
a flat braided wire that is arranged side by side with the movable spring through a space, and has a conductivity higher than that of the movable spring.

4. The electromagnetic relay as claimed in claim 1 , further comprising:
a case that houses the electromagnet, the movable spring, the first terminal, the second terminal, the actuator and the card; and
a first cover and a second cover that cover the magnetic members, the permanent magnet and the case.

5. The electromagnetic relay as claimed in claim 4 , wherein
the first cover includes a through-hole that fills an adhesive fixing the first cover to the case, and a cut part that fills an adhesive and fixes the second cover,
the second cover includes a recess part that fills an adhesive fixing the second cover to the case, and
the recess part is arranged so as not to overlap with the first cover and the case in an upper view.

Assignees

• Fujitsu Component Ltd

Inventors

• Murakoshi Takuji
• Kubono Kazuo
• Iwamoto Daiei

Classifications

• H01H50/56 Primary

  Contact spring sets · CPC title

• H01H50/58 Primary

  Driving arrangements structurally associated therewith; Mounting of driving arrangements on armature · CPC title

• H01H50/36

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

• H01H50/38 Primary

  Part of main magnetic circuit shaped to suppress arcing between the contacts of the relay · CPC title

• H01H51/2227

  in which the movable part comprises at least one permanent magnet, sandwiched between pole-plates, each forming an active air-gap with parts of the stationary magnetic circuit (H01H51/2209 takes precedence) · CPC title