Browse Prior Art Database

Electromagnetic Actuator

IP.com Disclosure Number: IPCOM000095862D
Original Publication Date: 1964-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Clapper, GL: AUTHOR

Abstract

This device converts oscillatory motion in either direction from a neutral point to continuous bidirectional rotary motion. The actuator is functionally similar to pulse-operated stepping motors and is characterized by simplicity of structure.

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Electromagnetic Actuator

This device converts oscillatory motion in either direction from a neutral point to continuous bidirectional rotary motion. The actuator is functionally similar to pulse-operated stepping motors and is characterized by simplicity of structure.

The device has a yoke 3 of magnetic material, having a shaft 5 of magnetic material carried in a bearing assembly 7. Shaft 5 has mounted on it a first disk 9 of magnetizable material which is affixed to shaft 5 to prevent either relative rotation or sliding along the shaft. Also mounted loosely on shaft 5 is a second disk 11 of magnetizable material. Disk 11 is retained in a neutral or center position by a leaf spring 13 and has an armature 15 affixed to it. A pair of electromagnets 17 and 19 is mounted at opposite ends of the yoke 3. The parts are proportioned and arranged so that energization of a selected one of the two magnets attracts armature 15 toward that magnet, causing a rotary displacement of the first disk 11 from its neutral position. At the same time, the flux in the magnetic circuit including armature 15, disks 9 and 1 1, shaft 5 and yoke 3 causes disk 11 and armature 15 to move axially along the shaft. Thus, disks 9 and 11 are frictionally engaged and the rotational movement of disk 11 is frictionally coupled to disk 9 and turns shaft 5 through a predetermined angular distance. When the electromagnet is de-energized, spring 13 returns disk 11 to its neutral position. But since disks...