Известия высших учебных заведений. Электромеханика最新文献

{"title":"DC Bus Voltage Stabilization of Autonomous Inverter As Part of Frequency-Controlled Electric Drive with Integrated Energy Storage Supercapacitors","authors":"V. Polyakov, I. Plotnikov, Roman Popov","doi":"10.17213/0136-3360-2022-2-27-34","DOIUrl":"https://doi.org/10.17213/0136-3360-2022-2-27-34","url":null,"abstract":"The research considers the problem of maintaining the voltage on the DC bus of a frequency converter with an auton-omous inverter, which is part of an alternating current electric drive with a frequency method of speed control. The electric drive is equipped with an energy storage device with integrated supercapacitors coupled to a DC bus through a reversible step-down DC-DC converter. In the research, an approach for maintaining the DC bus voltage at a preset level by compensating the load current of an autonomous inverter with an external current of the energy storage is proposed, that solves the main issue. Energy accumulator is equipped with single-circuit servo current control system. The study considers several variants of current control systems based on the principle of combined control. The goal of this research is to evaluate the accuracy of voltage stabilization on the DC bus of an autonomous inverter. Also pre-sented theoretical analysis of current control systems error coefficients. The simulations of the electric drive are car-ried out with and without accounting the discreteness of the energy storage converter. The results of the study can be useful in the development of systems for optimizing energy storage with supercapacitors for various applications.","PeriodicalId":105792,"journal":{"name":"Известия высших учебных заведений. Электромеханика","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114832209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An Approach to the Use of an External Magnetic Field As a Diagnostic Sign of an Asynchronous Motor Malfunction","authors":"Ildar Yamansarin, M. Salikov, A. Padeev, D. Surkov","doi":"10.17213/0136-3360-2021-3-18-23","DOIUrl":"https://doi.org/10.17213/0136-3360-2021-3-18-23","url":null,"abstract":"The article deals with the issues related to the possibility of diagnosing the technical condition of an asyn-chronous electric motor by an external magnetic field. The justification of the problems associated with the di-agnosis of electric motors is given. The difficulties that arise when measuring the external magnetic field of electric motors, as well as the devices with which it is possible to carry out measurements, are described. The re-lationship between the EMF of the sensor and the external magnetic field is shown. The results of processing the EMF waveforms induced by an external magnetic field in an inductive sensor for various electric motors are presented. The processing was carried out by the fast Fourier transform method. The external magnetic field contains the first harmonic and various harmonics that are multiples of the combination of the stator teeth, or the sum of the stator and rotor teeth that fall on one pair of poles. The ratio of the amplitudes of the first and tooth harmonics is affected by the measurement location and the orientation of the sensor. Diagrams showing the ratio of the main and tooth harmonics at different points of the motor body are constructed. The depend-ences of the harmonic amplitudes on the magnitude of the magnetizing current of the stator are given. Changes in the amplitudes and spectrum of harmonics in the presence and absence of an inter-turn short circuit in the stator winding are shown. Diagrams of the circular external magnetic field for the main and higher harmonics are constructed. The study shows the possibility of using an external magnetic field to detect inter-turn short circuits of the stator winding.","PeriodicalId":105792,"journal":{"name":"Известия высших учебных заведений. Электромеханика","volume":"600 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116296246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A New Approach to the Formation of Test Mathematical Models of Complex Electrical Circuits","authors":"I. Lebedev, Nikolay Savelov, S. Basan","doi":"10.17213/0136-3360-2021-6-5-11","DOIUrl":"https://doi.org/10.17213/0136-3360-2021-6-5-11","url":null,"abstract":"When developing new methods for analyzing electrical circuits and comparing various already developed methods, one of the actual problems is the creation of tests for evaluating the effectiveness of algorithms. For such tests, it is advisable to use schemes of complex circuits. However, with an increase in the number of circuit elements, the development of a circuit diagram, preparation of initial data for mathematical modeling and vis-ual presentation of the circuit become more and more difficult. To solve these problems, it is proposed to use pre-ordered electrical circuits. An algorithm for the formation of mathematical models of circuits with an almost unlimited number of elements is proposed. Experiments on the formation and application of mathematical models of electrical circuits containing more than five hundred elements have been carried out. The generated mathematical models are used to evaluate a specific algorithm for analyzing electrical circuits.","PeriodicalId":105792,"journal":{"name":"Известия высших учебных заведений. Электромеханика","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123547463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electric Drive Speed Control in the Rolling Stand of a Plate Mill During Front-End Bending Forming","authors":"A. Karandaev, B. Loginov, M. Zinchenko, V. Khramshin","doi":"10.17213/0136-3360-2022-3-26-41","DOIUrl":"https://doi.org/10.17213/0136-3360-2022-3-26-41","url":null,"abstract":"Forming a front-end bending of a strip plate is an urgent problem for rolling stand electric drives at plate mills. Un-controlled strip plate bending can cause rolling stand equipment damage while the turn-down strip plate bending can cause blows and strip sticking during movement along the rolling table. On the basis of literature data analysis, it was found that the uncontrolled front-end strip bending can be caused by a number of processing factors. The main factors are the mismatch between the speeds of the top and the bottom rolls, temperature difference along the strip plate thickness, difference in the friction coefficients and others. Beside the influence on the strip plate shape, the mismatch between the speeds determines the correlation between the roll electric drive torques. The horizontal rolling stand 5000 at the Public Joint-Stock Company “Magnitogorsk Iron and Steel Works” (PJSC “MMK”) was used as an exam-ple to show that in the process of heavy section rolling the difference in motor torques can be threefold. At the same time as the strip plate thickness decreases with each pass, the load ratios of the top and bottom roll main drives revers-es. In order to coordinate the speed and load modes, a load division controller was added to the system. The main dis-advantage is the fact that it carries out load control as a function of the speed difference between the top and the bot-tom roll main drives. The proposed oscillograph records prove that it is impossible to provide the preset speed ratio in the dynamic mode, which arises when the strip enters the rolling stand. To eliminate the disadvantage, a method of electric drive control was developed; in accordance with this method, the speed control in the bending formation mode is carried out in proportion to the difference in set value signals at the inputs of the top and the bottom roll main drive speed control units. A structural diagram was shown, which demonstrates the method implementation by adding a supplementary speed coordination controller at the input of the load division controller. A simulation model scheme of electromechanical systems of the top and the bottom rolls, which are interrelated through the metal, was shown. As a result of the simulation, it was found that the method implementation can provide the speed misalignment at a level close to the preset one during the whole period of bending formation. The control algorithm implementing the devel-oped method was introduced in the automatic control system of the rolling stand at the plate mill 5000. Oscillograph records were given to prove the main theoretical conclusions. The developed algorithm makes it possible to reduce the set values for bending formation by more than a half. Due to this, the geometry accuracy improves and the length of the curved section decreases. This can provide lower mismatch of the top and bottom main drive torques and their faster alignment. Beside the electric motor torque relief, it impr","PeriodicalId":105792,"journal":{"name":"Известия высших учебных заведений. Электромеханика","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124837544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simulation Modeling of Unidirectional Dynamic Remagnetization of Electrical Steel","authors":"I. Podbereznaya, Aleksandr Podbereznaya","doi":"10.17213/0136-3360-2021-4-5-5-13","DOIUrl":"https://doi.org/10.17213/0136-3360-2021-4-5-5-13","url":null,"abstract":"The problem of modeling unidirectional dynamic remagnetization of electrical steel in periodic modes, in-cluding sinusoidal and non-sinusoidal changes in the average cross-section of the induction sheet, is consid-ered and solved. The relevance of the problem under consideration is determined by the fact that when design-ing semiconductor pulse converters of power supply systems operating in peak load modes, it becomes neces-sary to calculate their characteristics and parameters with a more accurate setting of the magnetic characteris-tics of steel, taking into account the real processes of dynamic magnetization reversal observed in the magnetic circuits of transformers and chokes. The proposed simulation model of dynamic magnetization reversal of a ferromagnet allows us to describe with acceptable accuracy the nonlinear, hysteresis and dynamic properties and characteristics of steel, including hysteresis loops, the main magnetization curves, and losses. The performed modernization of the classical Giles – Atherton(JA) model makes it possible to take into account and approxi-mately describe the eddy currents and magnetic viscosity that appear during dynamic remagnetization. The de-veloped numerical procedure allows you to identify the parameters of the constructed model and configure it. The results of the performed validation of the model using experimental data confirm the possibility of its application to describe the characteristics of electrical steel in dynamic modes of remagnetization.","PeriodicalId":105792,"journal":{"name":"Известия высших учебных заведений. Электромеханика","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129397508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling the Stability of an Electromechanical Converter with Axial Loads","authors":"Konstantin K. Kim, Maxim B. Kolesnik, S. Ivanov","doi":"10.17213/0136-3360-2022-2-45-50","DOIUrl":"https://doi.org/10.17213/0136-3360-2022-2-45-50","url":null,"abstract":"An algorithm for conducting a study of an electromechanical converter under axial loads is given. The object of the simulation is an asynchronous electric motor with an integrated linear displacement mechanism, the subject of the study is mechanical stresses arising in the structural elements of the engine. The results of modeling and analysis of mechanical stability are presented. Experimental results were obtained using T-Flex and SolidWorks Simulation packages. Based on the dependencies obtained in relation to the electric drive of the pipeline valve, the possibility of determining the torque of an engine loaded with axial stresses is shown. The proposed approach makes it possible to minimize the power of the electric drive with the variability of axial loads","PeriodicalId":105792,"journal":{"name":"Известия высших учебных заведений. Электромеханика","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128525203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative Evaluation of AC Electric Motors of Asynchronous and Synchronous Types for Use in Rowing Electric Drives High Power Icebreakers","authors":"G. Ptakh, Npp Mir Llc","doi":"10.17213/0136-3360-2019-5-24-30","DOIUrl":"https://doi.org/10.17213/0136-3360-2019-5-24-30","url":null,"abstract":"","PeriodicalId":105792,"journal":{"name":"Известия высших учебных заведений. Электромеханика","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128715192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improvement of External and Traction Power Supply System’s Efficiency by Normalizing the Schemes","authors":"N. Grigoriev, I. Ignatenko, V. Kovalev, P. Trofimovich","doi":"10.17213/0136-3360-2021-4-5-72-78","DOIUrl":"https://doi.org/10.17213/0136-3360-2021-4-5-72-78","url":null,"abstract":"The article deals with improvement off the efficiency of external and traction power supply systems using for example indicators of traction substations for a real electric transmission line segment of a traction network of 25 kV. The analysis of the functioning of a real section of electrified railways with traction substations, two of which are connected according to the \"feeding\" scheme is providing in the article. The currents in the wind-ings of traction transformers are calculate for these substations. The proportion of the currents values of the most loaded winding to the two less loaded is 2: 1. The coefficient asymmetry of currents of transformer wind-ings operating on existing traction substations is equal to 1. The results prove a significant currents asymmetry of transformers windings and phases of electric transmission lines which leads to an increasing voltage unbal-ance. New schemes for connecting traction substations for the considered section of electrified railways have been developed in order to improve the quality indicators of electrical energy. New connection schemes for three traction substations, determined according to the requirements for connecting to the external and trac-tion power supply system are presents in the article. The calculation for new schemes of connecting traction substations, similar to the previously considered option, has been performed. The values of winding currents, power transmission line phases and coefficient asymmetry were obtained for new substation connection schemes. The proposed schemes for connecting traction substations provide a decrease in the coefficient asym-metry of the winding currents from 1 to 0.5 and a decrease in the current modulus in the most loaded windings by 1.5 times. New schemes for connecting traction substations reduce the currents of the most loaded windings and phases of the power transmission line, as well as the asymmetry of currents, which ensures an improvement in the efficiency of the external and traction power supply systems of the real traction network.","PeriodicalId":105792,"journal":{"name":"Известия высших учебных заведений. Электромеханика","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128205082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of the Influence of the Magnitude of the Rotor Slip on the Characteristics of an Asynchronous Synchronous Generator","authors":"V. Korshunov, V. Rozhkov","doi":"10.17213/0136-3360-2022-1-37-41","DOIUrl":"https://doi.org/10.17213/0136-3360-2022-1-37-41","url":null,"abstract":"The article considers the influence of the rotor slip value on the quality of the generated electricity of an asyn-chronous synchronous generator. Using the FEMME program, computational studies were performed to deter-mine the harmonic composition of the flow coupling of the armature winding. Studies have been carried out for the idle mode and nominal mode at various types of load. The calculations were performed at different rotor speeds. It is noted that with an increase in the rotor slip, the first harmonic of the flow coupling of the armature winding decreases by 1,5 %. The third harmonic of the flow coupling slightly depends on the sliding of the rotor.","PeriodicalId":105792,"journal":{"name":"Известия высших учебных заведений. Электромеханика","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132198516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamics of Nonsymmetric Conductor with Foucault’s Currents","authors":"S. Gerasimov","doi":"10.17213/0136-3360-2022-1-25-28","DOIUrl":"https://doi.org/10.17213/0136-3360-2022-1-25-28","url":null,"abstract":"The purpose of this work is to measure the force acting on an asymmetric conductor in an alternating magnetic field. Since Foucault currents are inductive, the force acting on the conductor, averaged over the period of oscil-lations of the alternating magnetic field, must be equal to zero. This became the basis for making detailed meas-urements of the change in the weight of a conductor when a magnetic field is turned on. The nature of the magnet-ic field created by the source has been studied. This made it possible to determine the region where the magnetic field is uniform. Even when an unbalanced conductor is located in a region where the field is uniform, the aver-age force acting on the conductor is not zero. Particular attention is paid to the dependence of the change in the weight of the conductor in the form of a half ring on the angle of inclination with respect to the horizontal. This made it possible to separate the background component from the Abraham force, which is the force of the radia-tion reaction to the conductor. The maximum value of the measured Abraham force is significantly higher than the known experimental values and is observed with a horizontal conductor with a cylindrical surface located below","PeriodicalId":105792,"journal":{"name":"Известия высших учебных заведений. Электромеханика","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130251779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}