Instruments and Systems: Monitoring, Control, and Diagnostics Annotation << Back To the speed feedback transmission coefficient determination in digital precision positional system with PWM control A.P. LEONOV The technique is offered to determine the speed feedback transmission coefficient in digital precision positional system with PWM control based on the use of the frequency Nyquist criterion for logarithmic characteristics. The precision digital system with PWM control structure is studied and the conditions are analyzed under which this digital control system can be calculated as continuous in the first approximation. Given theoretical conclusions are illustrated by specific precision positional digital control system analysis example. The choice conditions of speed feedback coefficient are formulated for this system. Structural scheme transformation is used to simplify the open system transmission coefficient determination within speed feedback introduction. The urgency of the proposed technique is explained by the fact that non-linear discrete control systems study is a very complicated problem [1, 2]. Adhering to the conditions shown in the article the offered technique greatly simplifies the precision digital control systems analysis procedure. Keywords: digital precision positional system of automatic control, precision positioning, transient quality, digital speed measurement, the frequency Nyquist criterion for logarithmic characteristics. Contacts: E-mail: anatoli.leonov@gmail.com Pp. 33-38.