Investigation of the Influence of Transport Delay Magnitude on Robustness of the Follow-Up Motor

The paper has considered the system of automatic control of a follow-up motor and demonstrated the possibility of investigating this system as a discrete one with changing parameters of the transport delay. The transfer function of the control object has been obtained with interval coefficients of the numerator and denominator polynomials, taking into account the possible ranges of changes in the transport delay. The applied graphical method of investigating the obtained system has provided the output of the family of root trajectories on the complex plane, it visually demonstrated the robust absolute stability of the system of automatic control of the follow-up motor. The simulation carried out in the Matlab system has proved the correctness of the obtained results and the ease of using standard procedures compared to the known ones.