D-A Conversion With a Digital Synchro
Shigeru ARAMAKI, Akimasa Ishida · Transactions of the Society of Instrument and Control Engineers · 1970
In a modern control system such as the numerical control system and the computer control system, servomechanism is often necessary to convert digital data to a real shaft angle. A synchro has been used as a D-A converter and a detector of an angle in such a servomechanism. But the synchro is not easy to use as a D-A converter when the given digital data are decimal or binary.So the authors propose to use a 5-phase synchro and an 8-phase synchro.The 5-phase synchro has five stator windings corresponding to the decimal number and the 8-phase synchro has eight stator windings corresponding to the binary number.These digital synchros (a 5-phase synchro and an 8-phase synchro) have advantage in comparison with a usual synchro because D-A conversion is rather simple when digital data are decimal or binary.This paper presents the principle and practice of these digital synchros and examines the problem of multi-speed system.