Статті в журналах: "Linear impulse electromechanical converter"

1

Bolyukh, V. F., and I. S. Shchukin. "INFLUENCE OF AN EXCITATION SOURCE ON THE POWER INDICATORS OF A LINEAR PULSE ELECTROMECHANICAL CONVERTER OF INDUCTION TYPE." Tekhnichna Elektrodynamika 2021, no. 3 (April 19, 2021): 28–36. http://dx.doi.org/10.15407/techned2021.03.028.

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The purpose of the article is to evaluate the efficiency of an induction-type linear pulse electromechanical converter (LPEC) when operating in shock-power mode and excitation from an alternating voltage source (AVS) in comparison with excitation from a capacitive energy storage (CES). A mathematical model of an induction-type LPEC has been developed both when excited by a unipolar pulse from a CES and from an AVS using lumped parameters of the windings, which takes into account the interrelated electromagnetic, mechanical and thermal processes. It has been found that when the LPEC is excited from the AVS with a voltage frequency of 50 Hz, the electrodynamic force takes on a periodic decaying character with a significant prevalence of positive components of forces over negative ones. The maximum value of the force is much less, and the value of its impulse is much greater than in the LPEC, excited from the CES. With an increase in the frequency of the AVS voltage from 50 to 150 Hz, the highest value of the current density of the inductor winding decreases, and in the armature winding it increases. The greatest values of force and impulse of force are realized at a voltage frequency of 150 Hz. With an increase in the AVS frequency, the relative indicator of the efficiency of the LPEC increases. References 15, figures 4.

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2

Bolyukh, V. F., A. I. Kocherga, S. V. Oleksenko, and I. S. Schukin. "A TECHNIQUE OF EXPERIMENTAL INVESTIGATIONS OF LINEAR IMPULSE ELECTROMECHANICAL CONVERTERS." Electrical Engineering & Electromechanics, no. 2 (April 29, 2017): 18–28. http://dx.doi.org/10.20998/2074-272x.2017.2.03.

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3

Baida, Evgen, and Olena Korol. "Comparative analysis of electromechanical processes in induction-dynamic converter with mobile inductor and two disks." Bulletin of NTU "KhPI". Series: Problems of Electrical Machines and Apparatus Perfection. The Theory and Practice, no. 1 (5) (May 28, 2021): 3–7. http://dx.doi.org/10.20998/2079-3944.2021.1.01.

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General description of the research topic. The article presents a comprehensive study of traditional induction-dynamic mechanisms (with one disk and a fixed coil) and multi-core induction-dynamic mechanisms (linear pulse induction converters) with a movable coil and two disks. Actuality of the topic. Such induction-dynamic mechanisms are widely used in various fields, in particular, in electrical apparatus industry, where speed is one of the most important characteristics. The purpose of the article is a comparative analysis and refinement of the characteristics of the traditional induction-dynamic system with one disk and a fixed coil and multi-core one with a movable coil and two disks. Research method, scientific novelty. The calculations are based on the solution of the equations of the electromagnetic field and the equations for the electric circuit of the coil. Practical significance and main conclusions. During the calculations, the values of electromagnetic force and force impulse acting on the moving disk, energy losses in the system and electromagnetic energy of the system are determined. The results of the study are presented in the form of graphs, namely, the coil current and total magnetic energy for a traditional induction-dynamic mechanism with one disk and for multi-core one with two disks, Joule losses in a fixed coil and disk (in a traditional system) and in a moving coil and two disks (in a multi-core system), force impulse and electromagnetic force of a moving coil (in a multi-core system) and a moving disk (in a traditional and a multi-core system) total impulse of the moving parts of the induction-dynamic mechanism with a multi-core system, as well as the electromagnetic force and the total force acting on the moving parts of the induction-dynamic mechanism with a multi-core system. It is shown that the induction-dynamic mechanism with two disks is less effective in terms of electromagnetic force, impulse and electromagnetic energy than the induction-dynamic mechanism of the traditional layout.

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4

Bolyukh, V. F., Yu V. Kashansky, and I. S. Schukin. "Features of excitation of a linear electromechanical converter of induction type from an AC source." Electrical Engineering & Electromechanics, no. 1 (February 23, 2021): 3–9. http://dx.doi.org/10.20998/2074-272x.2021.1.01.

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Purpose. The purpose of the article is to establish the basic laws of operation of induction-type linear electromechanical converter (LEMС) during operation in high-speed and shock-power modes and excitation from an AC source of increased frequency. Methodology. With the help of a mathematical model, the regularities of the course of processes in a LEMС, excited from an AC source, were established when working with shock-power and high-speed modes. The solutions of the equations of the mathematical model, which describe interrelated electrical, magnetic, mechanical and thermal processes, are presented in a recurrent form. Results. It was found that when the LEMC operates in the shock-power mode, the maximum value of the current in the inductor winding occurs in the first half-period, and in the inhibited armature winding in the second half-period. The electrodynamic force changes at twice the frequency, taking on both positive and negative values. Since the positive values exceed the negative ones, the magnitude of the impulse of the electrodynamic force increases with each period of the force. Depending on the initial voltage phase, the relative change in the magnitude of the force impulse is 1.5 %. It was found that when the LEMC operates in high-speed mode, the current in the inductor winding in the first half-period has the greatest value, but after several periods it takes on a steady state. The temperature rise of the inductor winding increases with the time of connection to the AC source, and the temperature rise of the armature winding has the nature of saturation. The electrodynamic force has an oscillatory character with strong damping and a significant predominance of the positive component. Depending on the initial phase of the voltage, the relative change in the maximum speed of the armature winding is 2.5 %. Originality. For the first time, a mathematical model of the LEMC, excited from an AC source, was developed, the solutions of the equations of which describe the interrelated electrical, magnetic, mechanical and thermal processes. For the first time, the regularities of the course of processes in LEMC were established when working with shock-power and high-speed modes. Practical value. The characteristics of LEMC are obtained, which determine the efficiency of work in shock-power and high-speed modes. It is shown that the initial voltage phase has no significant effect on the power, high-speed thermal performance of the converter excited from an alternating current source.

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5

Bolyukh, V. F., A. I. Kocherga, and I. S. Schukin. "ELECTROMECHANICAL PROCESSES IN A LINEAR PULSE-INDUCTION ELECTROMECHANICAL CONVERTER WITH A MOVABLE INDUCTOR AND TWO ARMATURES." Electrical Engineering & Electromechanics, no. 2 (April 10, 2018): 11–17. http://dx.doi.org/10.20998/2074-272x.2018.2.02.

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6

Bolyukh, Vladimir F., Sergei V. Oleksenko, and Igor S. Shchukin. "FEATURES OF THE EXPERIMENTAL STUDY OF LINEAR ELECTROMECHANICAL CONVERTER OF IMPACT ACTION." ELECTRICAL AND COMPUTER SYSTEMS 22, no. 98 (May 25, 2016): 116–21. http://dx.doi.org/10.15276/eltecs.22.98.2016.20.

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7

Malev, N. A., O. V. Pogoditsky, and A. S. Malacion. "Q-tables formation method for automated monitoring of electromechanical converters parameters with application of linear integral criterion." Power engineering: research, equipment, technology 22, no. 2 (May 15, 2020): 86–97. http://dx.doi.org/10.30724/1998-9903-2020-22-1-86-97.

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In the process of functioning working sets with electromechanical converters included in their composition, it is necessary to take into account the influence of endogenous and exogenous disturbances that cause deviations of the parameters of electric machines from the nominal values given by the manufacturer in the appropriate documentation. These deviations of the parameters, even those within the permissible range of changes, have a noticeable effect on the quality of functioning of electromechanical converters and working sets as a whole. During the life cycle of the work of electromechanical converters, their parameters change as a result of natural wear and senescence, which necessitates continuous or periodic analysis and monitoring of the state objects under study. The paper considers a method based on the calculation of the linear integral criterion Q and the formation of Q – tables, which allows monitoring the functioning of electromechanical converters with unstable parameters during operation as part of working sets. Simulink – models of linear integral criterion calculation system and system of automated monitoring of electromechanical DC converter parameters are presented, which allow estimating unstable parameters. In these models static characteristics are implemented in tabular form reflecting the dependencies between the parameters of the electromechanical converters and the linear integral criterion. The results of the study allow us to obtain estimates of changes in the unstable parameters of electromechanical DC converters with the required accuracy.

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8

Bolyukh, V. F., A. I. Kocherga, and I. S. Schukin. "INFLUENCE OF ARMATURE PARAMETERS OF A LINEAR PULSE ELECTROMECHANICAL CONVERTER ON ITS EFFICIENCY." Electrical Engineering & Electromechanics, no. 6 (November 27, 2017): 21–26. http://dx.doi.org/10.20998/2074-272x.2017.6.03.

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9

Holopainen, Timo P., Asmo Tenhunen, Erkki Lantto, and Antero Arkkio. "Numerical Identification of Electromagnetic Force Parameters for Linearized Rotordynamic Model of Cage Induction Motors." Journal of Vibration and Acoustics 126, no. 3 (July 1, 2004): 384–90. http://dx.doi.org/10.1115/1.1688764.

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The electromechanical interaction in cage induction motors induces additional forces between the rotor and stator. Recently, a linear parametric model was presented for these forces and the model was validated experimentally. The effective identification of the model parameters is crucial, because the electromagnetic system is nonlinear. The aim of this study was to present how to apply the impulse response method to estimate the required parameters. The numerical results show that this method is very effective. In addition, the force model was combined with a mechanical rotor model and the feasibility for electromechanical rotor problems was demonstrated.

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10

Bolyukh, V. F. "EFFECT OF ELECTRIC CONDUCTING ELEMENT ON INDICATORS OF LINEAR PULSE ELECTROMECHANICAL CONVERTER INDUCTION TYPE." Tekhnichna Elektrodynamika 2020, no. 3 (May 5, 2020): 22–29. http://dx.doi.org/10.15407/techned2020.03.022.

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11

Олексенко, Сергій Володимирович. "Influence of the configuration of the anchor on efficiency of the linear electromechanical converter." Technology audit and production reserves 6, no. 1(8) (December 11, 2012): 29–30. http://dx.doi.org/10.15587/2312-8372.2012.5463.

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12

Bolyukh, V. F., and I. S. Schukin. "INVESTIGATION OF THERMAL PROCESSES IN A LINEAR PULSE-INDUCTION ELECTROMECHANICAL CONVERTER OF CYCLIC ACTION." Electrical Engineering & Electromechanics, no. 5 (October 20, 2017): 14–22. http://dx.doi.org/10.20998/2074-272x.2017.5.02.

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13

Bolyukh, V. F., A. I. Kocherga, and I. S. Schukin. "INVESTIGATION OF A LINEAR PULSE-INDUCTION ELECTROMECHANICAL CONVERTER WITH DIFFERENT INDUCTOR POWER SUPPLY CIRCUITS." Electrical Engineering & Electromechanics, no. 1 (February 7, 2018): 21–28. http://dx.doi.org/10.20998/2074-272x.2018.1.03.

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14

Bolyukh, V. F., and I. S. Schukin. "AN OPTIMIZATION APPROACH TO THE CHOICE OF PARAMETERS OF LINEAR PULSE INDUCTION ELECTROMECHANICAL CONVERTER." Electrical Engineering & Electromechanics, no. 6 (December 12, 2018): 18–25. http://dx.doi.org/10.20998/2074-272x.2018.6.02.

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15

Bolyukh, V. F., and I. S. Shchukin. "Influence of limiting the duration of the armature winding current on the operating indicators of a linear pulse electromechanical induction type converter." Electrical Engineering & Electromechanics, no. 6 (December 3, 2021): 3–10. http://dx.doi.org/10.20998/2074-272x.2021.6.01.

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Introduction. Linear pulse electromechanical converters of induction type (LPECIT) are used in many branches of science and technology as shock-power devices and electromechanical accelerators. In them, due to the phase shift between the excitation current in the inductor winding and the induced current in the armature winding, in addition to the initial electrodynamic forces (EDF) of repulsion, subsequent EDF of attraction also arise. As a result, the operating indicators of LPECIT are reduced. The purpose of the article is to increase the performance of linear pulse electromechanical induction-type converters when operating as a shock-power device and an electromechanical accelerator by limiting the duration of the induced current in the armature winding until its polarity changes. Methodology. To analyze the electromechanical characteristics and indicators of LPECIT, a mathematical model was used, in which the solutions of equations describing interrelated electrical, magnetic, mechanical and thermal processes are presented in a recurrent form. Results. To eliminate the EDF of attraction between the LPIECIT windings, it is proposed to limit the duration of the induced current in the armature winding before changing its polarity by connecting a rectifier diode to it. It was found that when the converter operates as a shock-power device without limiting the armature winding current, the value of the EDF pulse after reaching the maximum value decreases by the end of the operating cycle. In the presence of a diode in the armature winding, the efficiency criterion, taking into account the EDF pulse, recoil force, current and heating temperature of the inductor winding, increases. When the converter operates as an electromechanical accelerator without limiting the armature winding current, the speed and efficiency decrease, taking into account the kinetic energy and voltage of the capacitive energy storage at the end of the operating cycle. In the presence of a diode in the armature winding, the efficiency criterion increases, the temperature rise of the armature winding decreases, the value of the maximum efficiency increases, reaching 16.16 %. Originality. It has been established that due to the limitation of the duration of the armature winding current, the power indicators of the LPECIT increase when operating as a shock-power device and the speed indicators when the LPECIT operates as an electromechanical accelerator. Practical value. It was found that with the help of a rectifier diode connected to the multi-turn winding of the armature, unipolarity of the current is ensured, which leads to the elimination of the EDF of attraction and an increase in the performance of the LPECIT.

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16

Tatevosyan, A. A. "Optimization of parameters of quiet permanent magnet synchronous motor for linear drive of long-stroke single-stage piston compressor." Power engineering: research, equipment, technology 23, no. 6 (April 1, 2022): 148–56. http://dx.doi.org/10.30724/1998-9903-2021-23-6-148-156.

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The article proposes a solution to the problem of optimizing the magnetic system design of a low-speed synchronous motor with permanent magnets (PMSM) as a part of a linear drive of a single-stage piston compressor that is promising for use in compressor construction for a given law of motion of the moving part. The maximum efficiency of the electromechanical converter is used as an optimality criterion. By solving the optimization problem, the relationship between the design parameters and the energy performance of the PMSM was established in an analytical form. The substantiation of the maximum possible efficiency of the PMSM for the sinusoidal and non-sinusoidal laws of motion of the inductor is given.PURPOSE: Obtaining a solution to the problem of optimizing the magnetic system design of a low-speed PMSM as a part of a linear drive of a single-stage reciprocating compressor for a given law of motion of the moving part that meets the criterion of maximum efficiency of an electromechanical converter.METHODS: The methods of the theory of electromechanical energy converters, theoretical electrical engineering, mathematical modeling, optimization methods, variational, differential and integral calculus, as well as experimental methods are used.RESULTS: The results of an experimental study of the developed prototype of a low-speed SDPM as a part of a linear drive of a long-stroke single-stage reciprocating compressor are presented.CONCLUSION: The highest efficiency of the PMSM is achieved when the current in the armature winding changes with time in direct proportion to the speed of the inductor. To ensure this mode, it is proposed to use an open-source frequency converter, which makes it possible to implement the time dependence of the current in the armature winding in accordance with the given law of motion of the moving part. The PMSM is controlled by a frequency converter based on structural models created in the MexBios environment.

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17

Jing, Hailian, Naoki Maki, Tetsuya Ida, and Mitsuru Izumi. "Electromechanical Design of an MW Class Wave Energy Converter With an HTS Tubular Linear Generator." IEEE Transactions on Applied Superconductivity 28, no. 4 (June 2018): 1–4. http://dx.doi.org/10.1109/tasc.2018.2810298.

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18

Bolyukh, V. F., Yu V. Kashanskyi, and I. S. Shchukin. "Influence of pulse excitation on electromechanical indicators of a linear pulse converter of electrodynamic type." Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, no. 3 (2020): 73–80. http://dx.doi.org/10.33271/nvngu/2020-3/073.

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19

Kesucz, Flaviu-Nicolae. "Experimental Modeling of the Optimized Motion Control of Electromechanical Actuators Used in Thermal Power Plants." Carpathian Journal of Electronic and Computer Engineering 13, no. 3 (September 1, 2020): 30–40. http://dx.doi.org/10.2478/cjece-2020-0005.

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AbstractThe purpose of scientific research in this paper is to improve the operation of thermal power plants. The experimental stand for the study was made for testing, verifying and adjusting the dynamic parameters of the electromechanical actuators that are integrated in the gas valve component. In order to improve the performance of the thermal power plants by increasing the energetic, mechanical, electrical efficiency, this will be achieved through an alternating-alternative static converter, experimentally realizing the single-phase alternating voltage variable module. System optimization is to find new solutions for controlling the linear motion of electromechanical actuators, including the choice of working principles that would become patent proposals, or new research stands.

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20

Bolyukh, V. F., S. V. Oleksenko, and I. S. Schukin. "EXPERIMENTAL STUDY OF FERROMAGNETIC CORE PARAMETERS INFLUENCE ON ELECTROMECHANICAL CHARACTERISTICS OF A LINEAR INDUCTION-DYNAMIC CONVERTER." Electrical Engineering & Electromechanics, no. 5 (October 14, 2014): 13–18. http://dx.doi.org/10.20998/2074-272x.2014.5.02.

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21

Bolyukh, V. F., V. G. Dan’ko, and S. V. Oleksenko. "The Effect of an External Shield on the Efficiency of an Induction-Type Linear-Pulse Electromechanical Converter." Russian Electrical Engineering 89, no. 4 (April 2018): 275–81. http://dx.doi.org/10.3103/s106837121804003x.

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22

Zhao, Wen, Sally Ahmed, Hossein Fariborzi, and Mohammad I. Younis. "Analytical and experimental study of the dynamics of a micro-electromechanical resonator based digital-to-analog converter." Journal of Micromechanics and Microengineering 31, no. 12 (November 3, 2021): 125010. http://dx.doi.org/10.1088/1361-6439/ac3219.

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Abstract In this paper, an analytical model of a micro-electromechanical (MEM) resonator used as a 4-bit digital-to-analog converter (DAC) is presented. First, we derive the dynamic equation of the 4-bit DAC device, and the nonlinear governing equation is solved by the Galerkin method combined with a shooting technique to simulate the static response, linear eigenvalue problem, and forced vibration response of the device for various electrostatic actuation cases. Also, we optimize the air gaps in the linear domain to ensure enhanced performance of the DAC. Further, to analyze the operation of the DAC in the nonlinear regime, two experimental samples powered by −2 dBm and −12 dBm AC inputs are examined. Forward and backward frequency sweeps are conducted experimentally and analytically. The proposed analytical results are validated by comparison with experimental data. The results indicate that the presented modeling, simulations, and optimization are effective tools for the design of MEM resonator-based circuits.

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23

Mykhailenko, Vladyslav, Vadym Svyatnenko, Yuliya Chunyak, and Vladyslav Bachynskiy. "Research of processes in a converter with four-zone voltage regulation and electromechanical load." Bulletin of NTU "KhPI". Series: Problems of Electrical Machines and Apparatus Perfection. The Theory and Practice, no. 1 (5) (May 28, 2021): 39–41. http://dx.doi.org/10.20998/2079-3944.2021.1.07.

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The new mathematical models of the electromagnetic processes is designed in three-phase electric circuit of the semiconductor converters with many-server zoned regulation phases voltages disregarding losses in semiconductor commutator for quick estimation of the influence parameter loads on level and form of the output voltage. mathematical model of the semiconductor converter is also used for study of the connecting processes in semiconductor converter with actively-inductive load. Will develop the method multivariable function, what fall into algorithmic equations of the analysis formed and connecting processes in furcated electric circuit with semiconductor commutator and reactive element, toward account of the particularities of the use phase and linear voltages to network of the power supply. Analysis of the electromagnetic processes is organized beside this article in electric circuit with semiconductor commutator. Mathematical model is created for analysis electro-magnetic processes in semiconductor converter with width pulsed regulation of the output voltage. The broughted graphs, which reflect the electromagnetic processes in electric circuit. Method much parametric functions was used when performing calculation. The mathematical model of the converter is created for eleven zoned regulations of the output voltage. Article is devoted to the development of a method of multi-parametric modulating functions by means of working out of new mathematical models and definition of functions and the algorithmic equations for the analysis on sub-system components of electromagnetic processes in electric circuits of variable structure with sinusoidal, direct and pulsing voltage. Introduction of functions with discrete parameters in the algorithmic equations for analysis of processes in circuits with semiconductor commutators simplifies modeling on subsystem components. The mathematical model of steady-state processes and transients in electric circuits of semiconductor converters of modulation type with multi-channel zonal use of phase and line voltages of a three-phase network of power supplies is developed. The mathematical model of electric circuits of thyristor shapers of electro-discharge pulses for the analysis and the matching of capacitors charging modes with decrease several times of electric resistance of technological load is also created.

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Hernández-Guzmán, Victor Manuel, Ramón Silva-Ortigoza, and Magdalena Marciano-Melchor. "Position Control of a Maglev System Fed by a DC/DC Buck Power Electronic Converter." Complexity 2020 (May 31, 2020): 1–16. http://dx.doi.org/10.1155/2020/8236060.

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In this paper, we solve the problem of position regulation in a magnetic levitation system that is fed by a DC/DC Buck power electronic converter as a power amplifier. We present a formal asymptotic stability proof. Although this result is local, the merit of our proposal relies on the fact that this is the first time that such a control problem is solved for a magnetic levitation system, a nonlinear electromechanical plant. In this respect, we stress that most works in the literature on control of electromechanical systems actuated by power electronic converters are devoted to control brushed DC motors which are well known to have a linear model. Furthermore, despite the plant that we control in the present paper is complex, our control law is simple. It is composed by four nested loops driven by one sliding mode controller, two proportional-integral controllers, and a nonlinear proportional-integral-derivative position controller. Each one of these loops is devoted to control each one of the subsystems that compose the plant: electric current through the converter inductor, voltage at the converter capacitor, electric current through the electromagnet, and position of the ball. Thus, our proposal is consistent with the simple and intuitive idea of controlling each subsystem of the plant in order to render robust the control scheme. We stress that such a solution is complicated to derive using other control approaches such as differential flatness or backstepping. In this respect, our proposal relies on a novel passivity-based approach which, by exploiting the natural energy exchange between the mechanical and electrical dynamics, renders possible the design of a control scheme with the above cited features.

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25

Bolyukh, V. F., Yu A. Kashanskij, A. I. Kocherga, and I. S. Schukin. "INVESTIGATION OF LINEAR PULSE ELECTROMECHANICAL CONVERTER OF INDUCTION TYPE WITH DOUBLE ARMATURE INTENDED FOR DESTROYING INFORMATION ON SSD STORAGE DEVICE." Electrical Engineering & Electromechanics, no. 5 (October 15, 2018): 17–23. http://dx.doi.org/10.20998/2074-272x.2018.5.03.

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Bolyukh, V. F., Yu V. Kashanskij, and I. S. Schukin. "INFLUENCE OF GEOMETRICAL PARAMETERS OF THE INDUCTOR AND ARMATURE ON THE INDICATORS OF A LINEAR PULSE ELECTROMECHANICAL CONVERTER OF AN ELECTRODYNAMIC TYPE." Electrical Engineering & Electromechanics, no. 3 (June 24, 2019): 11–17. http://dx.doi.org/10.20998/2074-272x.2019.3.02.

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Hoyos, Fredy E., John E. Candelo-Becerra, and Carlos I. Hoyos Velasco. "Application of Zero Average Dynamics and Fixed Point Induction Control Techniques to Control the Speed of a DC Motor with a Buck Converter." Applied Sciences 10, no. 5 (March 6, 2020): 1807. http://dx.doi.org/10.3390/app10051807.

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Several technological applications require well-designed control systems to induce a desired speed in direct current (DC) motors. Some controllers present saturation in the duty cycle, which generates variable switching frequency and subharmonics. The zero average dynamics and fixed point induction control (ZAD-FPIC) techniques have been shown to reduce these problems; however, little research has been done for DC motors, considering fixed switching frequency, quantization effects, and delays. Therefore, this paper presents the speed control of a DC motor by using a buck converter controlled with the ZAD-FPIC techniques. A fourth-order, non-linear mathematical model is used to describe the system dynamics, which combines electrical and electromechanical physical models. The dynamic response and non-linear system dynamics are studied for different scenarios where the control parameters are changed. Results show that the speed of the motor is successfully controlled when using ZAD-FPIC, with a non-saturated duty cycle presenting fixed switching frequency. Simulation and experimental tests show that the controlled system presents a good performance for different quantization levels, which makes it robust to the resolution for the measurement and type of sensor.

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Ostrouhov, Vsevolod, Dmitry Sychev, and Maxim Grigorev. "Synchronization of Auxiliary Mechanisms and Main Electric Drive of the Pipe Cold-Rolling Mill. Complete Solution." Machines 8, no. 4 (November 5, 2020): 71. http://dx.doi.org/10.3390/machines8040071.

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This article deals with installations with complex and nonstandard executive instrument movement. Having analyzed the technical implementation and operational features of cold-rolling pipe mills, the research team formulated the problem of synthesizing electric drives of auxiliary mechanisms. It is shown that the conditions for choosing a mechanical converter are associated with the oscillation of the processes of the electric drive system. The finite element method and the gradient descent method are used for structural analysis of solids and electromagnetic calculations. The data of the specific cost of semiconductor converters were analyzed using a linear least-squares regression technique. The advantages of a synchronous reluctance motor of independent excitation for the electric drives of auxiliary mechanisms are given and substantiated. The optimization of the geometrical parameters of the electromechanical converter was carried out according to the maximum developed electromagnetic torque. Modern semiconductor technology in the design of special-purpose electric drives leads to a revision of the principles for determining the optimal number of phases and the structure of the motor power supply. The rationale for the use of multilevel frequency converters is given. Taking into account an in-depth preliminary analysis and an integrated approach, these tasks were successfully completed, which was confirmed experimentally at the implementation of the developed system.

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Syafitri, Rosa, Pintoko Tedjokusumo, and M. Rizki Akbar. "Correlation Between Uric Acid and Atrial Electromechanical Coupling Interval in Heart Failure with Reduced Ejection Fraction." ACI (Acta Cardiologia Indonesiana) 6, no. 1 (March 1, 2020): 34–40. http://dx.doi.org/10.22146/jaci.v6i1.127.

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Background: Chronic Heart Failure (CHF) can lead to atrial and structural remodeling that result in non-homogenous impulse propagation and inter and intra-atrial conduction delay. Prolongation of interval of Atrial ElectroMechanical Coupling (AEMC) in CHF patient was related to atrial electromechanical remodeling and Atrial Fibrillation (AF) risk. Hyperuricemia found in CHF played a role in the pathophysiology of AF through neuro-hormonal activation, oxidative stress, inflammation and ionic channel dysfunction. This study aimed to investigate the association between uric acid and AEMCinterval in CHF with reduced ejection fraction.Methods: This study was a cross sectional study. Subject were CHF patients with reduced ejection fraction and sinus rhythm who visited cardiology clinic Dr. Hasan Sadikin Bandung between July - September 2018. Blood sampling for uric acid was performed in the morning after fasting 10-12 hours. AEMC interval was measured by echocardiography Tissue Doppler Imaging (TDI) as time interval from onset of P wave in surface electrocardiography to onset of A wave from TDI in lateral atrial wall called lateral PA interval. Statistical analysis was done by linear regression analysis to control confounding variables.Results: This study involved 51 CHF patients with reduced ejection fraction (< 40%) with median age 62 (27 – 81) year, 92% have history of myocardial infarction or coronary revascularization, 16% have diabetes mellitus, 51% have hypertension, and eGFR of 60.9 + 22.1. Mean uric acid was 8.0 + 2.2 mg/dL and mean lateral PA interval was 67.4 + 19.2 ms. Uric acid was significantly associated with lateral PA interval (R : 0.665, adjusted R2 0.407, P < 0.001) after controlling the confounding variables: systolic blood pressure and diastolic function.Conclusion: Uric acid significantly correlated positively with AEMC interval in CHF patients with reduced ejection fraction.

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Dmitrikov, Vladimir F., Alexander Yu Petrochenko, and Andrey A. Rozanov. "Design features of negative feedback and power smoothing filter of the DC / DC converter with pulse loads for transmitter-receiver modules of active electronically scanned arrays." Physics of Wave Processes and Radio Systems 24, no. 1 (May 6, 2021): 78–88. http://dx.doi.org/10.18469/1810-3189.2021.24.1.78-88.

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The fundamental difference of the voltage converter of the secondary power supply source for the transmitter-receiver modules of active electronically scanned arrays with impulse load and variable duty cycle from traditional voltage converters that constantly consume power from the primary network is shown. Methods for improving the quality of transient processes in voltage converter with constant power consumption during start-up by soft start are not applicable to improve the quality of transients in periodic current pulses caused by a pulsed load. Since any ripples, noises, instabilities in the power supply of the transmitter-receiver modules of active electronically scanned arrays operating in a linear mode lead to parasitic amplitude modulation of the emitted signal and to a deterioration in the quality of selection and target tracking, very strict requirements are imposed on the quality of the transmitter-receiver modules supply voltage (voltage ripple kп 0,5 %, the amount of overshoot of the output voltage sU 2 %, etc.). The article shows that such a quality of the output voltage with a pulsed load of the transmitter-receiver modules of active electronically scanned arrays can be obtained using a lower-type voltage converter, with a double-circuit negative feedback for the output voltage and current of the inductor, with a storage capacitor and with a power smoothing filter with the characteristics of Chebyshev and Butterworth. The work investigated the influence of the negative feedback depth on the output voltage and current of the smoothing filter choke, the value of the storage capacitor capacity, the type and parameters of the smoothing filter, and recommendations were given to select their optimal values, at which the required quality of the supply voltage for the transmitter-receiver modules of active electronically scanned arrays was ensured, taking into account the minimization of their dimensions.

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Dini, Pierpaolo, and Sergio Saponara. "Design of Adaptive Controller Exploiting Learning Concepts Applied to a BLDC-Based Drive System." Energies 13, no. 10 (May 15, 2020): 2512. http://dx.doi.org/10.3390/en13102512.

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This work presents an innovative control architecture, which takes its ideas from the theory of adaptive control techniques and the theory of statistical learning at the same time. Taking inspiration from the architecture of a classical neural network with several hidden levels, the principle is to divide the architecture of the adaptive controller into three different levels. Each level implements an algorithm based on learning from data and therefore we can talk about learning concepts. Each level has a different task: the first to learn the required reference to the control loop; the second to learn the coefficients of the state representation of a model of the system to be controlled; and finally, the third to learn the coefficients of the state representation of the actual controller. The design of the control system is reported from both a rigorous and an operational point of view. As an application example, the proposed control technique is applied on a second-order non-linear system. We consider a servo-drive based on a brushless DC (BLDC) motor, whose dynamic model considers all the non-linear effects related to the electromechanical nature of the electric machine itself, and also an accurate model of the switching power converter. The reported example shows the capability of the control algorithm to ensure trajectory tracking while allowing for disturbance rejection with different disturbance signal amplitude. The implementation complexity analysis of the new controller is also proposed, showing its low overhead vs. basic control solutions.

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32

Sun, Li, Hongbo Liu, and Chenglian Ma. "AC Tie-Line Power Oscillation Mechanism and Peak Value Calculation for a Two-Area AC/DC Parallel Interconnected Power System Caused by LCC-HVDC Commutation Failures." Energies 13, no. 5 (March 6, 2020): 1221. http://dx.doi.org/10.3390/en13051221.

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With the rapid development of ultra-high-voltage (UHV) AC/DC, especially the step-by-step upgrading of the UHV DC transmission scale, security presents new challenges. Commutation failure (CF) is a common fault in line commutated converter (LCC) high-voltage direct current (HVDC) power systems. Once failure happens, it may cause power oscillations in a system. In this paper, taking a two-area AC/DC parallel interconnected power system as the example, based on the impulse response model of second-order linear system, the mechanism of power oscillation on the AC tie-line caused by CF are clarified. It is proved that the peak value of the AC tie-line power oscillation is mainly determined by the DC power and the equivalent CF duration, the frequency and damping ratio of dominant area oscillation mode. Meanwhile, the peak time is mainly determined by the oscillation frequency. Finally, the correctness and effectiveness of the algorithms are verified by a simulation analysis of an extended IEEE-39-bus AC/DC parallel interconnected power system. These research results can provide a basis for the arrangement of the operating modes and the formulation of control measures for interconnected power grids.

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33

Simakov, G. M., V. V. Topovskiy, and I. A. Ilyenkov. "VECTOR CONTROL ALGORITHMS FOR AN ELECTROMECHANICAL UNBALANCE VIBRATION MODULE WITHOUT PRELIMINARY MAGNETIZATION OF THE ASYNCHRONOUS MOTOR." Bulletin of the South Ural State University. Ser. Computer Technologies, Automatic Control & Radioelectronics 21, no. 1 (February 2021): 35–48. http://dx.doi.org/10.14529/ctcr210104.

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With the development of electronic systems, the control of various asynchronous type electric motors is becoming more efficient and accurate. Such engines are used everywhere in the world, the variety of tasks performed by such mechanisms is growing every day, and the need for them is not decreasing. Nowadays, AC electric drive systems based on an asynchronous motor are becoming more widespread. This is due to the high reliability, simple design and relatively low cost of induction motors, as well as the rapid development of power converter technology, which makes it pos¬sible to create various types of semiconductor converters and reliable power supplies. In most cases, the vector control system is built for a pre-magnetized electric drive. This article discusses the synthesis of a vector control system for an asynchronous motor without preliminary magnetization, and also considers algorithms for vector control of an electromechanical unbalanced vibration module without preliminary magnetization of the asynchronous motor. Aim. To develop a control structure for an asynchronous motor of an unbalanced vibration module. Introduce a division link into the management structure. Synthesize a speed controller, rotor flux linkage and two components of the stator current. Compensate for the EMF action in the channels of the transverse and longitudinal axis. Provide the control system with the ability to reverse the electric machine. Implement the simulation of the resulting system and conduct a study of the results obtained, having obtained dynamic characteristics. Methods. The vector control system is constructed in the form of a stabilization channel of the rotor flux linkage module and a channel for controlling the rotor rotation speed. To achieve the desired result, we introduce a nonlinear regulator of the division link type into the control structure. This will convert the nonlinear structure to linear. Let's compensate the EMF action in the channels of the transverse and longitudinal axis. Having realized the simulation of the obtained system, we will conduct a study of the results obtained, having obtained dynamic characteristics. Results. Structural modeling was carried out in the MATLAB/Simulink software package. For the purpose of a comparative assessment of the synthesis results of a control system with a torque regulator in the form of a division link, a subordinate control system will also be synthesized, which has similar parameters of the power unit. Conclusion. The choice of the motor torque as the output coordinate makes it possible to significantly simplify the mathematical model of the induction motor. In addition to the features of the mathematical model of an asynchronous electric motor, in this work it is necessary to take into account the features of the vibration module as a load. In this case, two main features can be distinguished – a large moment of inertia of the flywheel masses of the electric drive, as well as a sinusoidal dependence of the moment of resistance on the angle of rotation of the rotor.

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Kashuba, Alexander V. "Optimization method for calculating the geometrical dimensions of the tooth zone of the switched reluctance motor." Transportation Systems and Technology 6, no. 1 (March 30, 2020): 30–47. http://dx.doi.org/10.17816/transsyst20206130-47.

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Background: Switched reluctance motor (SRM) is a promising type of electromechanical energy converter. It is used in both motor and generator modes. SRM can be used not only in mechanisms with rotational motion, but also as linear motors, including maglev transport systems. A lot of publications are devoted to SRM design issues. In development of this direction, further improvement of the SRM design process is proposed using the optimization method of forming the geometrical dimensions of the tooth zone. Aim: Reducing of electromagnetic torque ripple SRM by optimizing the geometrical dimensions of the tooth zone. Materials and Methods: To simulate magnetic fields, the FEMM 4.2 program was used. The implementation of the optimization algorithm and the processing of the results of field calculations, was carried out in the MATLAB program. The Monte Carlo optimization methods (they rely on random sampling) was taken as the basis for developing the optimization algorithm, and its improvement was achieved using mathematical methods based on probability theory. Results: As a result of the optimization calculations, the tooth zone geometry was obtained, which provides a reduction in the pulsation of the SRM electromagnetic torque ripple from 122% to 40%. Conclusion: The studies presented in the paper indicate the effectiveness of using the optimization algorithm in designing SRM, as well as the feasibility of removing restrictions on the shape of the tooth SRM and the use of a curved tooth shape, which is determined in the process of solving the optimization problem by a determined criterion.

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KIM, Konstantin K., and Aleksandr Yu PANYCHEV. "Innovative electrical engineering developed for the transport industry by the Emperor Alexander I Petersburg State Transport University." BULLETIN OF SCIENTIFIC RESEARCH RESULTS 2021, no. 4 (December 2021): 87–103. http://dx.doi.org/10.20295/2223-9987-2021-4-87-103.

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Objective: To familiarize the general scientific community with the latest electrotechnical innovative developments for the transport industry, carried out by the scientists of the Emperor Alexander I Petersburg State Transport University in the period from 2000 to 2021. Methods: We used the methods of calculation of electromagnetic fields and circuits, mathematical analysis, mathematical physics and numerical methods in the development of the described devices and systems. Results: 101 We developed a pipeline high-speed magnetolevitation transport system with vehicle movement in a rarefied atmosphere, a series of pantograph pantographs for heavy-loaded and high-speed trains using solid lubricants and a contactless method of transmitting electrical energy, a plasma device for fine cleaning of circuit boards for microcircuits, a device for creating a comfortable climate in office premises, electrohydroimpulse installations designed for loosening frozen coal in gondola cars in winter, shock tests of wagons, escalators and travalators using linear electric motors, high-speed electric switches-breakers, heat generators based on an electromechanical converter with the functions of a heater and pump, a wagon generator with a forced excitation system, a pulse voltage generator, allowing to measure the pulse resistance of the grounding conductors of the contact network supports, a complex of installations for various purposes using ozone technologies, a system for laser monitoring of the integrity of tanks, a device for diagnosing the degree of corrosion of the fittings of contact supports, an electrohydroimpulse installation for impact welding, treatment plants, technology for recycling car tires, security systems of the main trackbed. Practical importance: The use of the described developments will increase energy efficiency, energy saving and safety of production processes in transport

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36

Volkov, V. "MINIMIZATION OF ELECTRICAL CONSUMPTION OF A FREQUENCY-REGULATION INDUCTION MOTOR WITH A FAN LOAD IN START-BRAKING REGIMES." Electromechanical and energy saving systems 4, no. 56 (December 2021): 8–24. http://dx.doi.org/10.30929/2072-2052.2021.4.56.8-24.

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Purpuse. To minimize the total power consumption in start-braking regimes by a three-phase squirrel-cage frequency-regulated induction motor, loaded a centrifugal fan (or smoke exhauster), and also to obtain analytical dependencies for calculating the optimal durations of acceleration and deceleration times, corresponding to minimizing the total energy consumption of this motor in start-braking regimes with the indicated type of load. Metodology. Based on the methods of calculus of variations and numerical solution of non-linear differential equations, the quasi-optimal type of trajectories of speed change (tachograms) of the motor with the considered load in start-braking regimes is determined. Using the methods of mathematical analysis and similarity, the acceleration and deceleration times of an induction motor with a fan load were optimized for different (linear, parabolic and quasi-optimal) types of tachograms. Using the method of computer simulation, the energy consumption in the start-braking regimes of an induction motor with the indicated load for these types of tachograms was quantified. Results. Refined analytical dependencies are obtained for calculating the consumed active power and energy in start-braking regimes by a frequency-regulated induction motor with a fan load for the mentioned various types of tachograms. Analytical optimization of the consumption of active energy of this motor in start-braking regimes has been carried out. The change at the optimal durations for the starting-braking regimes and the corresponding it’s total energy consumption of the motor with varying the maximum value of the motor speed in these regimes has been researched. A quantitative assessment of transient electromechanical and energy processes in the considered motor with a fan load has been carried out. For this motor, as applied to the non-regenerative version of the static frequency converter, a scalar automatic control system is proposed, by means of which the motor accelerates with a constant rotor flux linkage with a given (linear, parabolic or quasi-optimal) speed trajectory and brakes on freewheel. The expected annual saving of active energy by an induction motor, loaded with a smoke exhauster, in starting and braking regimes, achieved by optimizing the form of the tachograms and the duration of the acceleration and deceleration times, is determined. Originality. Analytical dependencies are obtained for calculating the optimal durations of the acceleration and deceleration times of an induction motor with a fan load, corresponding to minimizing the energy consumption of this motor in start-braking regimes. The "U"-shaped form of dependences of the total energy, consumed during acceleration (or the total generated energy during braking) of the induction motor in function the duration of the deceleration (or braking) times is established. An analytical dependence is obtained for changing the speed of a motor loaded by a fan or a smoke exhauster during the freewheel braking regime, and an analytical expression is proposed for determining the duration of the indicated braking time. Practical value. On the example of an induction motor loaded by a smoke exhauster, the possibility of saving the total energy consumption in start-braking regimes was identified: from 77 to 90 % – due to the use of the proposed quasi-optimal tachogram and the use of practically realizable optimal acceleration and deceleration times, and also in the amount of 10 % – through the transition from freewheel braking to regenerative braking. Figures 6, tables 6, references 22.

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Freeman, C. T., P. L. Lewin, E. Rogers, D. H. Owens, and J. J. Hatonen. "Discrete Fourier Transform Based Iterative Learning Control Design for Linear Plants With Experimental Verification." Journal of Dynamic Systems, Measurement, and Control 131, no. 3 (March 19, 2009). http://dx.doi.org/10.1115/1.3072149.

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This paper considers the design of linear iterative learning control algorithms using the discrete Fourier transform of the measured impulse response of the system or plant under consideration. It is shown that this approach leads to a transparent design method whose performance is then experimentally benchmarked on an electromechanical system. The extension of this approach to the case when there is uncertainty associated with the systems under consideration is also addressed in both algorithm development and experimental benchmarking terms. The robustness results here have the applications oriented benefit of allowing the designer to manipulate the convergence and robustness properties of the algorithm in a straightforward manner.

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"Development of a Laboratory Unit for Preventing Ice Formation on the Model of Power Lines." Bulletin of the South Ural State University series "Power Engineering" 20, no. 4 (2020): 43–53. http://dx.doi.org/10.14529/power200405.

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This article describes the structure of a device to prevent the formation of ice on the cables of power lines using the impulse shock method with the lateral type of fastening. The actuator of the device is a magnetic pulse electromechanical energy converter. It can ensure that the parameters of the impact match the calculated values in a wide range of times and forces. This advantage determined the choice in favor of this type of actuators. The basic functions of the device are described herein. Based on this, the functional blocks are highlighted and their description is given. The influence of various design parameters of device parts on its performance is described. We also formulated requirements for structural elements. As a result, a reasonable choice was made when designing the device. A laboratory unit was developed to prevent the formation of ice using a scaled-down model of a power transmission line cable. A system for measuring vibrations at several points of a cable is described. The results of an experimental study of wire vibrations are presented. The correspondence of the calculated and experimental values of the cable deviation is shown, which indirectly confirms the correspondence of the developed device’s parameters to the calculated values.

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"Stability Analysis of Power System using FACT Controller." International Journal of Engineering and Advanced Technology 9, no. 3 (February 29, 2020): 3732–35. http://dx.doi.org/10.35940/ijeat.c6322.029320.

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The Stability of power system is influenced by different elements such as harmonic distortion attributed to non-linear loads, like unregulated voltage and unstudy current because of sag and swell and switching capacity. One of the effective methods is to make use of an integrated circuit of active shunt and series power filters such as Unified power quality conditioner in short called as UPQC. Such instrument binds a active shunt power filter with a active series power filter in Sequential formation, to simultaneously make up for the regular supply of voltage and current or to remove voltage and current disturbances in a power allocation and networking system. In present article, a latest layout of Unified power quality conditioner in short called as UPQC has been presented, consisting of a electromechanical device such as Direct current to direct current converter and the storage device joined to the dirct current (DC) link of the UPQC to counter the voltage disturbances.

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Avdeyev, Boris Aleksandrovich. "CALCULATION OF THE POWER OF A TWO-DIRECTIONAL DC/DC CONVERTER FOR AUTONOMOUS UNDERWATER APPARATUS." Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies, May 25, 2019, 101–9. http://dx.doi.org/10.24143/2073-1574-2019-2-101-109.

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One of the ways to increase the efficiency of autonomous underwater vehicles is to use a DC electric power system. With the help of impulse control it is possible to achieve a stable voltage on consumers even with significant changes in the speed of the propeller rotation caused by waves, bottom relief, current, winds, course change, etc. Issues related to the simulation of DC-DC converters for autonomous underwater vehicles have been considered. The powers supplied from a DC power source to loading have been found. Possible ways of regulating the power and voltage at the output of the pre-driver are analyzed and performing the power and voltage adjustment by means of the phase angle to the inverting and rectifying bridges is proved to be expedient. At an angle of 90º, the current in the pulse transformer looks like a sinusoid in shape, and at the same time it is simple for piecewise linear approximation, which in turn makes it easy to determine the transmitted power over a period. Various variants of an output signal are presented under changing a phase angle of opening of IGBT-transistors. There have been illustrated oscillograms of the AC-DC converter and of the current type in the inductor. According to the calculations, the analytical solution was found to determine the transmitted power. A bi-directional DC converter was modeled using a Simulink package, which resulted in a voltage on the inductor and voltage on the load as a graphic dependence. The obtained dependences completely coincide with the theoretical analysis.

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Sheng, Wanan, and Anthony Lewis. "Assessment of Wave Energy Extraction From Seas: Numerical Validation." Journal of Energy Resources Technology 134, no. 4 (August 7, 2012). http://dx.doi.org/10.1115/1.4007193.

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In developing a wave energy converter (WEC), assessing and rating the device is a difficult, but important issue. Conventionally, a large scaled device (maybe large enough for accommodating a power takeoff (PTO) system) or prototype device is needed to be tested in wave tanks or in seas in different wave conditions so that a power matrix for the device can be defined using scaling or interpolation/extrapolation methods. Alternatively, a pure numerical simulation in time-domain may be used for assessing the power capture capacities of wave energy devices. For the former, it is convincing, but can be especially difficult in the early stages of development, when small scaled models are normally used; and for the latter, the pure numerical simulation may not be very reliable and convincing, especially when the dynamic problem is very complicated. In this paper, a method for assessing the captured wave power for a device from its power capture response is presented. In the proposed method, a measured or calculated linear power capture response of the device is combined with wave spectrum to compute the average captured power function. Once the average captured power function is obtained, the overall average captured power corresponding to the wave state can be easily calculated. If a linear power capture response is obtained from a model test, the power assessment based on this proposed method can be very convincing and reliable. To illustrate the application of the proposed method, an example of a fully linear dynamic system, including the linear hydrodynamics of the floating structure and a linear power takeoff, is considered. For such a system, the frequency-domain analysis can be employed to obtain the performance of the floating device under waves and the power takeoff system. The hydrodynamic performance of the wave energy converter is then used to define the power capture response and to calculate the average captured power functions in different sea states. Then, the captured power of the device in different sea states, i.e, the power matrix, can be calculated, and accordingly, the device can be assessed and rated. To validate the proposed method, a time-domain analysis is also performed for a cross-check. In the time-domain analysis, the hydrodynamic coefficients and responses are first assessed in frequency-domain, and then transformed into the relevant terms by means of impulse response functions for establishing the time-domain (TD) equation. By comparing the results from frequency-domain and time-domain analyses of irregular waves, it can be concluded that the proposed wave energy capture assessment method can be used in assessing or rating the device.

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