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Coarse Fine Gearless Differential Drive

IP.com Disclosure Number: IPCOM000096253D
Original Publication Date: 1963-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Thompson, DR: AUTHOR

Abstract

This is a system for positioning a pinion at any one of 1024 equal step angular positions in response to a 10-bit binary input. The system comprises a 32:1 reduction gear 1 and stepping motors 3 and 5. Each is capable of producing any one of thirty-two equal step shaft positions in response to a 5-bit input.

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Coarse Fine Gearless Differential Drive

This is a system for positioning a pinion at any one of 1024 equal step angular positions in response to a 10-bit binary input. The system comprises a 32:1 reduction gear 1 and stepping motors 3 and 5. Each is capable of producing any one of thirty-two equal step shaft positions in response to a 5-bit input.

The armature 7 of motor 3 is mechanically coupled through the 32:1 reduction gear 1 to the rotatable field of motor 5. Armature 9 of motor 5 is coupled directly to output pinion 11. Coarse positioning of output pinion 11 is thus the result of the rotation of the armature of motor 5 relative to its field. Fine positioning results from the rotation of the field of motor 5 which is controlled by motor 3 through the reduction gear 1.

An advantage of this system is that 1024 step positioning can be obtained using motors capable of only thirty-two equal step positions. This system provides superior accuracy of positioning by reason of reduced mechanical backlash.

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