ELECTROMAGNETIC ACTUATOR

• US 20140300435A1
• Filed: 04/07/2014
• Published: 10/09/2014
• Est. Priority Date: 04/08/2013
• Status: Active Grant

• Current Assignee: Hiroyuki Nabae, Tokyo Weld Co., Ltd., Toshiro Higuchi
• Original Assignee: Tokyo Weld Co., Ltd.
• Inventors: HIGUCHI, Toshiro, NABAE, Hiroyuki, TAKAHASHI, Koji
• Granted Patent: US 9,281,111 B2
• Time in Patent Office: Days
• US Class Current: 335/220
• CPC Class Codes: G10K 9/13 using electromagnetic driving means
• CPC Class Codes: H01F 7/081 Magnetic constructions
• CPC Class Codes: H01F 7/1638 Armatures not entering the winding

Abstract

There is provided an electromagnetic actuator which can secure a sufficient thrust force at least at a certain level over a wide range of displacement. The electromagnetic actuator 1 having a point of amplified displacement includes: a displacement amplification mechanism 1A made of a magnetic material and having two surfaces 2as, 2bs that form a gap 5 therebetween; and a coil 6 provided in the displacement amplification mechanism 1A. A magnetic flux is generated by passing an electric current through the coil 6, thereby generating an attraction force between the surfaces 2as, 2bs. The attraction force displaces the point of amplified displacement.

Claims

1. An electromagnetic actuator having a point of amplified displacement, comprising:

a displacement amplification mechanism including a magnetic body having a thrust generating portion; and

a coil, provided in the displacement amplification mechanism, for generating a magnetic flux in the magnetic body, wherein a magnetic flux is generated in the magnetic body by passing an electric current through the coil, thereby generating a thrust force in the thrust generating portion, and the point of amplified displacement is displaced by the thrust force.

2. The electromagnetic actuator according to claim 1, wherein the thrust generating portion consists of two surfaces that form a gap therebetween.

3. The electromagnetic actuator according to claim 2, wherein the displacement amplification mechanism has an annular portion and at least one pair of displacement portions disposed inside the annular portion and forming a gap therebetween.

4. The electromagnetic actuator according to claim 3, wherein at least part of the annular portion is comprised of an elastic member.

5. The electromagnetic actuator according to claim 3, wherein the coil is provided in one of the pair of displacement portions.

6. The electromagnetic actuator according to claim 3, wherein two or more pairs of displacement portions, forming a gap therebetween, are provided inside the annular portion.