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Electromagnetic Stepping Actuator

IP.com Disclosure Number: IPCOM000095729D
Original Publication Date: 1964-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 61K

Publishing Venue

IBM

Related People

Fisher, GA: AUTHOR

Abstract

Small incrementing steps are realized with the slotted pole structure shown in schematic cross-section. A diametrically polarized cylindrical permanent magnet 10 has splines 12 in both the north and south pole regions. A non-magnetic armature 20, comprising two interlaced windings 30 and 40, surround magnet 10 for rotation about it and is coupled by devices, not shown, to shaft 22. Splined soft iron pole pieces 10N and 10S complement the splined poles of magnet 10. Casing 50 serves also as a flux return path. Power is applied to windings 30 and 40 of armature 20 through slip rings 60.

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Electromagnetic Stepping Actuator

Small incrementing steps are realized with the slotted pole structure shown in schematic cross-section. A diametrically polarized cylindrical permanent magnet 10 has splines 12 in both the north and south pole regions. A non-magnetic armature 20, comprising two interlaced windings 30 and 40, surround magnet 10 for rotation about it and is coupled by devices, not shown, to shaft 22.

Splined soft iron pole pieces 10N and 10S complement the splined poles of magnet 10. Casing 50 serves also as a flux return path. Power is applied to windings 30 and 40 of armature 20 through slip rings 60.

While armature 20 is capable of continuous rotation in a given direction, windings 30 and 40 are not continuous. Winding 30 runs from slip ring 60' by way of lead 31, through interconnected elongated armature conductors 32 in the inner layer and 33 in the outer layer. The latter connects by a loop 35 to interconnected conductors 36 in the outer layer and interconnected conductors 37 in the inner layer, through lead 39 to a common slip ring 60". Similarly, winding 40 comprises lead 41, conductors 42 and 43, loop 45, conductors 46 and 47, and lead 49 to slip ring 60'''.

Two conductors of armature 20 occupy the width of each of the lands and grooves of the splined sections. 1n the stable state, the currents in each of the two conductors flow in opposite directions and the currents in the two conductors of adjacent pairs are reversed with respect to eac...