ELECTRIC SERVO DRIVE SYSTEM OF PAPER MACHINE
Here are presented the synthesis of paper machine electric drives control systems. Quality indicators of paper and cardboard are directly related to the accuracy characteristics of the electric drives of both paper machine wires in conditions of unpredictable changes in loads on their shafts. It is shown that to solve the problem of stabilization of wires velocities and their ratio it is advisable to implement the principle of servo control. It is proposed to use the lower wire speed stabilization subsystem as the leading one, and the upper wire speed servo subsystem with the stabilization of the zero deviation of the integral from difference of electric drives speed. Presents the results of a synthesis and analysis of two-dimensional servo system finite electric drives control in conception of the modern vector-matrix control theory. A discrete-continuous mathematical model of the electromechanical system is obtained. To ensure the quality of speed control, discrete finite state regulators are used. As a result of the synthesis, expressions for the implementation of a discrete control device are obtained. In simulation, the reactions of the drives to the increment of the speed and to the increments of the loads on the drive shafts are obtained. The simulation results showed the effectiveness of the proposed principles of electric drive control. The electromechanical system demonstrates the properties of astatic control and reduces the deviation of velocities in steady-state modes to zero. The solution to the problem of reducing the mutual influence of electric actuators for the stabilization of the velocities of the paper machine wire and maintaining them in the specified ratios will reduce to a minimum the displacement of the paper layers formed on both wire. The practical application of the proposed electric drive control system in production contributes to improving the quality of products manufactured on a paper machine.