The appearance in recent years of the two-motor electric drives on the presses of high speed paper machines ensures increasing of the life of expensive press felts and improvement of production quality. The easiest and accurately acting from the different existing control systems of drives are two-motor drives with a total speed controller and individual thyristor converters for each motor separately. In this paper we study the dynamic characteristics of the system with a digital controller and correctors. The mathematical model of two-motor thyristor electric drive, taking into account the elastic properties of mechanical transmissions, is given. Applying the logarithmic frequency characteristics for tuning of digital controllers, correctors and current sensors of the drive system are given. The results of investigations of transient processes using the MATLAB sources are presented. This system guarantees maximum performance and proportional distribution of load between the motors without any additional controllers.

/pdf/dynamics-of-digital-system-of-two-motor-electrical-drive-lqe7fap0ax.pdf

Dynamics of Digital System of Two-Motor Electrical Drive with Elastic Transmissions

Abstract In the paper, optimization of scalar control system of two-motor electrical ac drive with individual regulators of speed is investigated. Structural scheme of the drive is constructed via electromagnetic process agreement taking into account elasticitic shaft. The expressions for the optimal parameters of digital regulators for stator currents of the motors and speed of the drive are given. Modelling results obtained on the computer are given. The considered system of ac drive provides optimal dynamic character as well as automatic distribution of loading between the motors.

/pdf/digital-control-system-of-two-motor-ac-electrical-drive-2qpx3d0cz9.pdf

Digital Control System of Two-Motor Ac Electrical Drive Built by Principles of Harland

In the paper analytically is constructed digital filter for DC-electrical drive with elastic junctions. It could be realized with two discrete integrators and five operational amplifiers. The filter would be insert sequentially on the output of the speed’s regulator. As results transient processes similar to transients of dc-electric drive with rigid mechanical shaft are obtained.

http://pubs.sciepub.com/ajeee/3/5/1/ajeee-3-5-1.pdf

A Digital Filter for Electrical Drive with Elastic Shaft

In the paper a mathematical model of two-motor electrical drive with one speed controller and two thyristor converters, by taking into account elasticity's and gaps of mechanical transducers, has been constructed. By using state-space methods, the transfer functions of the object have been determined. Some recommendations for tuning of the regulators have been suggested. Dynamical characteristics that are near to the optimal ones have been obtained by applying MATLAB.

http://ena.lp.edu.ua:8080/bitstream/ntb/16314/1/2-7-12.pdf

Modeling of dynamical regimes of two-motor electrical drives with due regard for elasticity and gaps of mechanical transducers

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A Digital Filter for Electrical Drive with Elastic Shaft

Dynamics of Digital System of Two-Motor Electrical Drive with Elastic Transmissions

Modeling of dynamical regimes of two-motor electrical drives with due regard for elasticity and gaps of mechanical transducers