ELECTROMAGNET DEVICE

• US 20090322453A1
• Filed: 06/23/2009
• Published: 12/31/2009
• Est. Priority Date: 06/30/2008
• Status: Active Grant

• Current Assignee: Omron Corporation
• Original Assignee: Omron Corporation
• Inventors: Kawaguchi, Kensuke, Hiroki, Kazuchika
• Granted Patent: US 8,179,217 B2
• Time in Patent Office: Days
• US Class Current: 335/81
• CPC Class Codes: H01F 2007/083 External yoke surrounding the coil bobbin, e.g. made of bent magnetic sheet
• CPC Class Codes: H01F 7/1615 Armatures or stationary parts of magnetic circuit having permanent magnet
• CPC Class Codes: H01H 2050/025 containing inert or dielectric gasses, e.g. SF6, for arc prevention or arc extinction
• CPC Class Codes: H01H 2051/2218 having at least one movable permanent magnet
• 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 50/546 for contactors having bridging contacts
• CPC Class Codes: H01H 51/2209 with rectilinearly movable armature
• CPC Class Codes: H01H 9/443 using permanent magnets

Abstract

A polar electromagnet device has a drive shaft comprising an axis center supported so as to reciprocate in an axis center direction at a center hole of a spool wound with a coil, and a movable iron core attached to a lower end of the drive shaft on the axis center. The drive shaft is reciprocated with the movable iron core which reciprocates based on excitation and demagnetization of the coil. A permanent magnet is integrally arranged at the movable iron core on the same axis center.

Claims

1. A polar electromagnet device comprising:

a drive shaft comprising an axis center supported so as to reciprocate in an axis center direction at a center hole of a spool wound with a coil; and

a movable iron core attached to a lower end of the drive shaft on the axis center,

wherein the drive shaft is reciprocated with the movable iron core which reciprocates based on excitation and demagnetization of the coil, and

wherein a permanent magnet is integrally arranged at the movable iron core on the same axis center.

2. The polar electromagnet device according to claim 1, wherein an annular auxiliary yoke is arranged at a position for exerting repulsive force based on a magnetic force generated by the excitation of the coil to the movable iron core in time of operation of an inner circumferential surface of the center hole of the spool.

3. The polar electromagnet device according to claim 1, wherein an annular auxiliary yoke is arranged at a position for enhancing a returning force of the movable iron core based on a magnetic force generated by the permanent magnet arranged at the movable iron core in time of returning of the inner circumferential surface of the center hole of the spool.

4. The polar electromagnet device according to claim 2, wherein an annular auxiliary yoke is arranged at a position for enhancing a returning force of the movable iron core based on a magnetic force generated by the permanent magnet arranged at the movable iron core in time of returning of the inner circumferential surface of the center hole of the spool.