Browse Prior Art Database

Linear Actuator

IP.com Disclosure Number: IPCOM000077558D
Original Publication Date: 1972-Aug-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Chai, HD: AUTHOR [+2]

Abstract

A linear actuator comprises a cylinder 1 having peripherally ribbed rings 2 and 3 adjacent the ends. A cylindrical armature 4 carries oppositely wound coil sections 6 and 7 and is provided with correspondingly ribbed cylindrical pole pieces 8 and 9. A permanent magnet 10 having cup-shaped soft iron pole pieces 12 and 14 is positioned stationarily within the armature.

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Linear Actuator

A linear actuator comprises a cylinder 1 having peripherally ribbed rings 2 and 3 adjacent the ends. A cylindrical armature 4 carries oppositely wound coil sections 6 and 7 and is provided with correspondingly ribbed cylindrical pole pieces 8 and 9.

A permanent magnet 10 having cup-shaped soft iron pole pieces 12 and 14 is positioned stationarily within the armature.

When a current flows through the coil sections, the axial Lorenz force developed on the coil in the air gap at the N pole side is additive with that at the S pole side. Thus, the armature 4 moves in an axial direction.

The particular coil winding scheme has extremely low inductance so that when a voltage pulse is applied, the current rises very rapidly, resulting in high acceleration. The ribbed rings and pole pieces provide oppositely disposed teeth 15 which result in good detenting characteristics.

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