ELECTROMAGNETIC DEVICE AND ELECTROMAGNETIC RELAY EQUIPPED WITH ELECTROMAGNETIC DEVICE

• US 20170365431A1
• 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 10,446,349 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 50/42 Auxiliary magnetic circuits, e.g. for maintaining armature in, or returning armature to, position of rest, for damping or accelerating movement
• 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, 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.

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,

wherein 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, 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 a 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 a 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 a 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 a direction perpendicular to a reciprocating direction of the movable member.

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