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Browse Prior Art Database

Linear DC Motor

IP.com Disclosure Number: IPCOM000076685D
Original Publication Date: 1972-Apr-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 77K

Publishing Venue

IBM

Related People

Padmanabhan, S: AUTHOR

Abstract

A linear DC motor has a generally cylindrical stator 1 made in two parts, 1a and 1b. A generally cylindrical armature 2 is slidably disposed in the stator, being supported by shaft extensions 8 in bearing end plates 7a and 7b.

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Linear DC Motor

A linear DC motor has a generally cylindrical stator 1 made in two parts, 1a and 1b. A generally cylindrical armature 2 is slidably disposed in the stator, being supported by shaft extensions 8 in bearing end plates 7a and 7b.

The main magnetic flux is generated by a field winding 3 centrally disposed between main poles 4a and 4b. The main poles have auxiliary pole extensions 5a, 5b, respectively, which extend to the bearing plates and provide magnetic flux bypasses around armature 2.

The armature has poles 10a and 10b adjacent its ends provided with recesses 11a and 11b, which contain control windings 12a and 12b, respectively. The main poles 4a and 4b are longer by the amount of armature shift than the recesses 11a and 11b, with edges A and C aligned with the armature in its leftmost position. The edges B and D are also aligned in the position shown. In the right-hand position the corresponding edges are opposite each other on the right-hand end of poles 4a and 4b.

Main coil 3 is constantly energized and normally either right-hand control winding 12b is energized by a shifting pulse to move the armature to the right, or left-hand control winding 12a is energized by a shifting pulse to move it to the left. Increased acceleration may be provided if an acceleration pulse is applied to one control winding, followed by a braking pulse to the other control winding. For example, an acceleration pulse may be applied to control winding 12b for approximat...