ELECTROMAGNETIC DEVICE AND ELECTROMAGNETIC RELAY EQUIPPED WITH ELECTROMAGNETIC DEVICE

• US 20170365432A1
• Filed: 06/12/2017
• Published: 12/21/2017
• Est. Priority Date: 06/17/2016
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: SAKAI, Satoshi, URUMA, Katsuya
• Granted Patent: US 10,446,350 B2
• Time in Patent Office: Days
• CPC Class Codes: H01H 50/163 Details concerning air-gaps, e.g. anti-remanence, damping, anti-corrosion
• CPC Class Codes: H01H 50/20 movable inside coil and substantially lengthwise with respect to axis thereof; movable coaxially with respect to coil
• CPC Class Codes: H01H 50/36 Stationary parts of magnetic circuit, e.g. yoke
• CPC Class Codes: H01H 50/44 Magnetic coils or windings
• CPC Class Codes: H01H 51/065 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 Class Codes: H01H 51/2209 with rectilinearly movable armature
• CPC Class Codes: H01H 51/27 Relays with armature having two stable magnetic states and operated by change from one state to the other

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.

Claims

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,

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.