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High Speed Magnetic Actuator

IP.com Disclosure Number: IPCOM000048753D
Original Publication Date: 1982-Mar-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 74K

Publishing Venue

IBM

Related People

Helinski, EF: AUTHOR

Abstract

A magnetic actuator 10 comprises a thimble or cup-shaped stator housing 11 of magnetic permeable material with a larger opening at one end than the other. The housing 11 encloses a coil bobbin 12 made of a suitable plastic bearing material, such as nylon. A T-shaped magnetically permeable armature 13 fits into the bobbin 12. A hole 14 in bobbin 12 provides a bearing surface for armature 13 to slide freely. The dimension of the bobbin hole 14 is only slightly smaller than the smallest hole of stator housing 11 and provides a good fit with the armature 13 so that the armature 13 cannot impact stator housing 11 and can pass through the holes 15 and 16 without interference. The T-shaped end 17 of armature 13 likewise clears the larger hole 16 of stator housing 11 by a small amount and may pass into the housing.

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High Speed Magnetic Actuator

A magnetic actuator 10 comprises a thimble or cup-shaped stator housing 11 of magnetic permeable material with a larger opening at one end than the other. The housing 11 encloses a coil bobbin 12 made of a suitable plastic bearing material, such as nylon.

A T-shaped magnetically permeable armature 13 fits into the bobbin
12. A hole 14 in bobbin 12 provides a bearing surface for armature 13 to slide freely. The dimension of the bobbin hole 14 is only slightly smaller than the smallest hole of stator housing 11 and provides a good fit with the armature 13 so that the armature 13 cannot impact stator housing 11 and can pass through the holes 15 and 16 without interference. The T-shaped end 17 of armature 13 likewise clears the larger hole 16 of stator housing 11 by a small amount and may pass into the housing.

Upon energization of winding 18 on bobbin 12, magnetic flux is produced and this flux concentrates at the leftmost side of the T section 17 and the leftmost small end of armature 13, producing forces which drive the armature 13 to the left.

The armature design is such that the small portion may be round, square or rectangular and the combined cross-sectional area of the both sides of the T section is equal to the cross-sectional area of the armature's leftmost portion. An impactor such as a wire 19 may be attached to armature 13 to provide a means for producing a dot as part of a matrix character produced by a printer.

Fig. 2 shows...