Corresponding author: Sidorov Igor S., Postgraduate Student, Samara State Technical University, Samara, 443100, Russian Federation,
e-mail: sidoov@rambler.ru

Received on April 04, 2016
Accepted on June 21, 2016

The paper studies the stability and dynamic quality parameters of the control of the digital positional precision electric drive depending on the frequency of the digital part quantization of the numerical control. The drive provides a program of movement and positioning precision of the movable body of the machine. Structurally, the digital actuator is designed as a three—loop system of subordinate regulation: current loop, speed loop and position loop. The astatic position loop has the greatest sampling period of the digital part of the system. The article analyzes the influence of the minimum programmable movement in the astatic position loop with the minimized power and speed on stability of the system circuits and the quality control indicators: deregulation and transition time. It also analyzes the stability of the sampled-data system on the transfer—function for the system in the open position in the form of Z-transformation based on the Shannon—Kotelnikov theorem. Herewith, there is an analysis of the reproduction accuracy of the given difficult path by the approximated part of a small radius circle and a playback accuracy analysis. The analysis is based on the study of the transfer function of the system in the closed state and the error transfer function state, respectively, in the form of Z-transformation. Z-transformation and bilinear transformation make it possible to analyze the processes in the system in the field of pseudo—frequencies and to present the results of the research in the form of a logarithmic amplitude—phase—frequency characteristic. These characteristics clearly and convincingly demonstrate the impact of the minimal programmable movement of the system on the dynamic quality indicators control in comparison with the analog prototype. The study clarified the relationship between the sampling rate of the digital portion of the frequency and bandwidth of the analog part of the system, providing the required accuracy of a complex trajectory of the movable part of the machine. In order to improve the performance of the technological operations it is necessary to maintain a constant and optimal processing speed for the given work material, which is possible by increasing the frequency of a digital quantization of the system in the function of the parameters of the motion path.
Keywords: zero order hold device, servo drive, discrete system, slave control system, digital-to-analog converter, sampling rate, analog prototype, Z-transformation, numerical control

For citation:
Sidorov I. S., Lysov V. E. Analysis of the Influence of the Sam­pling Rate Position Regulator of the Position Servo Electric Drive on the Dynamic Parameters of the Quality Control, Mekhatronika, Avtomatizatsiya, Upravlenie, 2016, vol. 17, no. 10, pp. 685—689.
DOI: 10.17587/mau.17.685-689

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