An Electronic DC to AC Converter for Use in Servo Systems

The usefulness of alternating current servomechanisms has been restricted in many cases by the difficulty of obtaining a satisfactory ac error signal. The conversion from dc signals to an ac error signal, i.e., the modulation system, is shown to be a predominant source of difficulty. A modulation circuit having characteristics, much improved over conventional types, has been developed. Practical application to a servomultiplier with results observed is discussed.