Electromagnetic relay

Patent metadata

Field	Value
Publication number	US-9330872-B2
Application number	US-201414261512-A
Country	US
Kind code	B2
Filing date	Apr 25, 2014
Priority date	Sep 21, 2012
Publication date	May 3, 2016
Grant date	May 3, 2016

Abstract

An electromagnetic relay includes a contact that includes a fixed contact and a movable contact, a permanent magnet provided on the peripheral side of the contact, and a non-magnetic body. The movable contact is displaceable in a first direction to move toward the fixed contact and in a second direction to move away from the fixed contact. The permanent magnet has a polarity direction perpendicular to the first and second directions. The non-magnetic body faces toward the direction of a Lorentz force that acts based on the permanent magnet in a direct electric current flowing through the contact.

First claim

What is claimed is:

1. An electromagnetic relay, comprising:
a contact that includes a fixed contact and a movable contact, wherein the movable contact is displaceable in a first direction to move toward the fixed contact and in a second direction to move away from the fixed contact;
a permanent magnet provided on a peripheral side of the contact, wherein the permanent magnet has a polarity direction perpendicular to the first and second directions; and
a non-magnetic metal body that faces toward a direction of a Lorentz force that acts on a direct electric current flowing through the contact based on the permanent magnet.

2. The electromagnetic relay as claimed in claim 1 , wherein the non-magnetic metal body has a flat plate shape or a cover shape that covers the contact.

3. The electromagnetic relay as claimed in claim 1 , wherein a distance between the non-magnetic metal body and the contact is determined based on a characteristic between the distance and a breaking time of the contact.

4. The electromagnetic relay as claimed in claim 1 , further comprising:
a housing that forms an outer shell of the electromagnetic relay,
wherein the permanent magnet and the non-magnetic metal body are fixed to the housing by being press-fitted into recesses of the housing.

5. An electromagnetic relay, comprising:
a plurality of contacts each including a fixed contact and a movable contact, wherein each movable contact is displaceable in a first direction to move toward the fixed contact and in a second direction to move away from the fixed contact;
a permanent magnet provided on a peripheral side of the plurality of contacts, wherein the permanent magnet has a polarity direction perpendicular to the first and second directions; and
a plurality of non-magnetic metal bodies each facing toward a direction of a Lorentz force that acts on a direct electric current flowing through one of the plurality of contacts based on the permanent magnet, wherein the non-magnetic bodies are provided across the plurality of contacts from each other.

Assignees

• Fujitsu Component Ltd
• Univ Shizuoka Nat Univ Corp

Inventors

• Kubono Kazuo
• Yuba Takashi
• Hasegawa Yoichi
• Murakoshi Takuji
• Sekikawa Junya

Classifications

• H01H9/36 Primary

  Metal parts · CPC title

• H01H50/54 Primary

  Contact arrangements · CPC title

• H01H50/546

  for contactors having bridging contacts · CPC title

• H01H9/443

  using permanent magnets · CPC title