Dynamic Compensation of Parameters in Servo Drives

In this paper, we studied a servo drive with an unlimited increase in the gain coefficients of the speed con-tour. We demonstrated dynamic compensation of parameters associated with the formation of differential com-ponents based on the coverage of the real coordinates of the control object using static model. It was shown that dynamics of the transient processes is caused by real differentiating links determining the fast and slow components of the transient process. The static velocity error in this case did not depend on the ratio of large and small time constants, as in a single integrating system of subordinate regulation of parameters. Therefore, we considered that parametric disturbances and their compensation occur due to the external astatic circuit. We demonstrated an equivalent transition to the position contour, the speed structure and position generator, corresponding to the organization of the servo drive in the CNC systems. We investigated features of the phase discriminator during the operation of the position sensor in the phase difference mode and carried out model-ing of the servo drive structures and comparative analysis of two and three-circuit systems.

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Design of High-Speed Process Machinery Transmissions in Order to Maximize the Benefits of Servo Drives

Proceedings of the Institution of Mechanical Engineers Part I Journal of Systems and Control Engineering ◽

10.1243/pime_proc_1994_208_302_02 ◽

1994 ◽

Vol 208 (1) ◽

pp. 15-29

Author(s):

D R Seaward ◽

G W Vernon

Keyword(s):

Selection Criteria ◽

High Speed ◽

Control Loop ◽

Servo Drive ◽

Total Transmission ◽

Process Machinery ◽

Control Computer ◽

Servo Drives ◽

The Many ◽

And Control

This paper addresses the many issues which confront a designer of a process machine when independent servo-drives are to be incorporated. Actuators which meet process requirements and which maximize servo-drive potential are described. Design and selection criteria for all elements of the total transmission system are discussed: servo-motors, feedback devices, control loop strategies, couplings, gearboxes, transmission belts, motion profiles and control computer systems. The paper draws upon a practical system which incorporated ten servo-drives cycling at 13 Hz with positional accuracies of 0.4 mm at 2.1 m/s.

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Investigations of applications of smart materials and methods in fluid valves and drives

Journal of Machine Engineering ◽

10.5604/01.3001.0013.6235 ◽

2019 ◽

Vol 19 (4) ◽

pp. 122-134

Author(s):

Andrzej MILECKI ◽

Dominik RYBARCZYK

Keyword(s):

Smart Materials ◽

Servo Drive ◽

Servo Valve ◽

Model Following Control ◽

Model Following ◽

University Of Technology ◽

Bending Actuator ◽

Pneumatic Valves ◽

Hydraulic Servo ◽

Servo Drives

In the paper the investigations performed at the Division of Mechtronic Devices at Poznan University of Technology in the area of application of both: smart materials in electro-hydraulic and electro-pneumatic valves, and new methods to control of hydraulic servo drives, are presented. In a first part the piezo bender actuator is shortly described and its application in servo valve is proposed. This actuator replaced the torque motor in the available on the market servo valve. The new valve simulation model is proposed. The simulation and investigations results of the servo valve with the piezo bending actuator are included. In the next part of the paper the application of piezo tube actuator in flapper-nozzle pneumatic valve is described. The test stand and investigations results are presented. Later, in the article, the Model Following Control (MFC) and Fractional order Control (FoC) methods are described. Their application in control of electrohydraulic servo drive is proposed. Some investigations results are included in the paper, showing the advantages of those control methods.

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Influences of Control Parameters on Reduction of Energy Losses in Electrohydraulic Valve with Stepping Motors

Energies ◽

10.3390/en14196114 ◽

2021 ◽

Vol 14 (19) ◽

pp. 6114

Author(s):

Andrzej Milecki ◽

Jarosław Ortmann

Keyword(s):

Energy Consumption ◽

System Structure ◽

Control Parameters ◽

Servo Drive ◽

Precise Control ◽

Supply Pressure ◽

Low Energy Consumption ◽

Servo Drives ◽

Electrohydraulic Valve ◽

Time And Energy

In many heavy machines, the use of high force drives is required. For such tasks, electrohydraulic servo drives with proportional valves are used most often. In these valves, the proportional electromagnets are applied. If high precise control is additionally required, it is necessary to use expensive servo valves or precise stepping motors. In this paper, the application of a valve with one (or with two) stepping motors in the electrohydraulic servo drive is described. Such motors may work in a micro-step mode, which enables the precise positioning of the valve spool with low energy consumption. The control system structure that was used for positioning, consisting of such an electrohydraulic servo drive with a valve having stepping motors, is described. In the investigations, the following control parameters are considered: the number of stepping motors used, proportional gain coefficients, supply pressure, and desired step distance. The simulation model of the servo drive is proposed, enabling the investigations of energy consumption during the positioning process. In the investigations, the drive step responses are recorded and compared, taking into account the rise time and energy consumption. The overshot-free algorithm is used in the following step and tested in positioning tasks. The collected results of energy consumption of the drive during the positioning process are compared with other solutions.

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Frequency response analysis methods for open-loop servo drives and control systems

Space engineering and technology ◽

10.33950/spacetech-2308-7625-2020-2-108-114 ◽

2020 ◽

pp. 108-114

Author(s):

Oleg B. Belonogov

Keyword(s):

Frequency Response ◽

Control Systems ◽

Open Loop ◽

Response Analysis ◽

Frequency Response Analysis ◽

Servo Drive ◽

Response Data ◽

Analysis Methods ◽

Servo Drives ◽

And Control

The paper presents results of development of frequency response analysis methods for open-loop servo drives and control systems, which use frequency response data of closed-loop servo drives and control systems obtained using Fourier and Laplace transforms of transient response calculated using their linear or linearized math models. The methods that have been developed can be used for approximate calculation of frequency response of servo drives and control systems based on their math models with slight non-linearities. Equations are derived for calculating frequency response of open-loop servo drives and control systems for several particular cases of feedback loop transfer function. The paper studies the efficiency of the developed frequency response analysis methods for open-loop servo drives and control systems. The obtained frequency response data for open-loop servo drives and control systems can be used for evaluating the amplitude and phase stability margins for these entities. Key words: frequency response; open-loop servo drive; control systems.

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High resolution processing of position sensor with amplitude modulated signals of servo drive

2017 IEEE Conference of Russian Young Researchers in Electrical and Electronic Engineering (EIConRus) ◽

10.1109/eiconrus.2017.7910735 ◽

2017 ◽

Cited By ~ 1

Author(s):

M.G. Tiapkin ◽

A.P. Balkovoi

Keyword(s):

High Resolution ◽

Position Sensor ◽

Servo Drive ◽

Modulated Signals

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Influences of Closed Loop Control Componentson the Performance of Ultra-Precision Machines

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.625.207 ◽

2014 ◽

Vol 625 ◽

pp. 207-212

Author(s):

Christian Brecher ◽

Dominik Lindemann ◽

Christian Wenzel

Keyword(s):

Closed Loop ◽

Research Work ◽

Step Response ◽

Precision Machining ◽

Closed Loop Control ◽

Servo Drive ◽

Loop Control ◽

Ultra Precision ◽

Servo Drives ◽

Accuracy And Repeatability

At Fraunhofer IPT a test bench has been setup to analyze closed loop control components and their interfaces with focus on their application in ultra-precision machining applications. This paper will present the results of the analysis of feedback and servo drive systems and will give a close inside on the influences of linear scales and analog and digital servo drives for applications in ultra-precision machining. The performed measurements include the analysis of the position accuracy and repeatability (step response test) as well as the determination of the dynamic frequency characteristics (stiffness / compliance) of an air bearing axis. With respect to the aforementioned measurements the tests have been performed under the variation of linear scales (vendor, pitch, signal, sampling frequency, etc.) and servo drives (vendor, switching or linear amplifiers, PWM frequency, control architecture, DC bus voltage, etc.). The paper will give a summary on the results of the analyzed topics, carefully chosen regarding their relevance to ultra-precision machining. Finally, a short outlook to future research work concerning the analysis of CNC controls will be given.

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Servo Drives’ Reliability Prediction Based on Analytical Method

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.556-562.1388 ◽

2014 ◽

Vol 556-562 ◽

pp. 1388-1391

Author(s):

Wei Mi ◽

Ying Min Yan

Keyword(s):

Analytical Method ◽

Analysis Method ◽

Servo Drive ◽

Reliability Modeling ◽

Unit System ◽

Computing Unit ◽

Electrical Stress ◽

Function Modules ◽

Circuit Component ◽

Servo Drives

For servo drives are expected to reliability problems, a comprehensive approach based on Analytical method is adopted. First, the principle of the servo drives are analyzed to study its structure and composition and further function modules. Then the solution of each circuit component parameters, environmental stress and electrical stress conditions than parameters, based on GJB/Z 299C-2006 to establish the reliability of the model, computing unit, system failure rate, and average working life (MTBF according to the characteristics of series and parallel components ). Finally, using Relex servo drive reliability modeling and simulation to verify the results of stress analysis method.

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Stabilization of Motion Trajectories of Servo Drive on Varying Parameters of Control Object Conditions

Elektronika ir Elektrotechnika ◽

10.5755/j01.eee.109.3.176 ◽

1970 ◽

Vol 109 (3) ◽

pp. 81-84

Author(s):

V. A. Gelezevicius

Keyword(s):

Output Signal ◽

Control Object ◽

Servo Drive ◽

Inertia Moment ◽

Varying Parameters ◽

Motion Trajectories ◽

Speed Controller ◽

Speed Regulation ◽

Permissible Range ◽

Position Controller

Practical approach designated for programmed trajectories of servo drive operating on varying parameters of transported object conditions stabilization is proposed and investigated in the paper. It is proposed in combination with MRSAC method, introduced in to speed control subsystem, to use means limiting derivative of position controller output signal. It is shown that in order to enlarge the permissible range of inertia moment variation the speed controller of speed regulation module should be adjusted under the maximum supposed inertia moment value The modelling results of the system are given. Ill. 5, bibl. 3 (in English; abstracts in English and Lithuanian).http://dx.doi.org/10.5755/j01.eee.109.3.176

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