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Closed Loop Stepper Control With Auto Synchronization Of Encoder Feedback

IP.com Disclosure Number: IPCOM000048721D
Original Publication Date: 1982-Mar-01
Included in the Prior Art Database: 2005-Feb-09

Publishing Venue

IBM

Related People

Authors:
Cavill, BR Dodgen, D Thomas, DC [+details]

Abstract

Traditionally, stepper drive systems are either 'open loop', in which the motor phase advances are timed, or 'closed loop', in which there is a physically fixed relationship between the motor and the attached encoder system. This relationship is set by adjustment of the emitter system phasing to match the motor phasing. After the emitter is adjusted, it can then be sensed and used to trigger motor phase changes. This adjustment is required because normal assembly of motor and encoder components does not guarantee synchronization.