scholarly journals Research of control systems for lifting and transport mechanisms

2021 ◽  
Vol 23 (3) ◽  
pp. 47-61
Author(s):  
T. V. Sinyukova ◽  
V. N. Meshcheryakov ◽  
A. V. Sinyukov
Keyword(s):  
Comparative Analysis ◽  
Electric Drive ◽  
Frequency Control ◽  
Frequency Converter ◽  
Asynchronous Motor ◽  
Point Of View ◽  
Asynchronous Motors ◽  
Drive Systems ◽  
Improved Characteristics ◽  
Energy Components

THE PURPOSE. To investigate the existing methods of frequency control and their influence on the characteristics of the asynchronous motor, including the energy parameters. Consider new circuit solutions of the control type under study. Create a mathematical model of each of the methods of frequency control. To analyze the results obtained from the point of view of the behavior of mechanical, electromechanical and energy components. METHODS. When solving this problem, the method of computer simulation modeling, implemented by means of Matlab Simulink, was used. RESULTS. In this paper, various aspects of electric drive systems based on asynchronous motors with the use of cascade switching are studied and described, existing connection schemes for such systems are analyzed, and several new options with improved characteristics are proposed. A comparative analysis of various connection schemes is made, the most interesting results of such analysis are presented, and conclusions are drawn about the future prospects of certain circuit solutions.Electric drive systems were modeled in the Simulink MATLAB environment using software tools to demonstrate the operation parameters of the considered circuits. CONCLUSION. Various schemes for switching on the asynchronous motor in the Simulink Matlab environment were investigated. The results of the study revealed the potential usefulness of using a circuit with a transformer in the rotor circuit, as well as the construction of a multi-motor electric drive with a common transformer and a common frequency converter circuit. The efficiency of parallel connection of rotary circuits of a two-motor electric drive was demonstrated. The methods of returning the sliding energy to the network are also compared, and their effectiveness in a comparative analysis with the operation in the closed-loop rotor mode is demonstrated.

scholarly journals Mathematical Simulation of the Synchronized Asynchronous Electric Drive

2020 ◽  
Vol 178 ◽  
pp. 01021 ◽  
Author(s):  
Victor Meshcheryakov ◽  
Dmitry Sibirtsev ◽  
Ekaterina Mikhailova
Keyword(s):  
Electric Drive ◽  
Control Method ◽  
Frequency Control ◽  
Frequency Converter ◽  
Asynchronous Motor ◽  
Motor Speed ◽  
Ac Drives ◽  
Asynchronous Electric Drive ◽  
Wide Range ◽  
Rotor Winding

At the end of the last century asynchronous motors with a phase rotor were most widely used among adjustable-speed AC drives. They were used for conveyors, transporters, cranes. That was due to the relative simplicity to adjust the motor speed by acting on the rotor chain. The introduction of a frequency control method in such drives is now complicated by the fact that most frequency converters are designed to be used in drives with a cage asynchronous motor. Shorting of a phase winding leads to highly increased losses during acceleration and motor speed control. If the stator winding of a wound-rotor asynchronous motor is connected to a frequency converter and the rotor winding is connected to a DC link of this converter, the motor will have properties of a synchronous one. The electric drive is able to work in a wide range, while motor characteristics are absolutely rigid. The implementation of such control method is presented in this article. The control system operation has been tested with simulation in the Matlab Simulink software pack. The obtained results are defined as follows.

scholarly journals FLAT ASYNCHRONOUS ELECTRIC DRIVE OF STONE MILL

2019 ◽  
Vol 14 (2) ◽  
pp. 77-82
Author(s):  
Рустам Аипов ◽  
Rustam Aipov ◽  
Рустам Галиуллин ◽  
Rustam Galiullin ◽  
Раушан Нугуманов ◽  
...  
Keyword(s):  
Asynchronous Motor ◽  
Rotation Frequency ◽  
Point Of View ◽  
Working Zone ◽  
Electric Drives ◽  
Belt Drives ◽  
Asynchronous Electric Drive ◽  
Asynchronous Motors ◽  
Longitudinal Edge ◽  
Flour Production

In modern flour production, the preservation of all vitamins and minerals in it is relevant. Minerals and vitamins are stored in flour, ground from whole grains. In the stone mills, the grain is subjected to repeated exposure to the working surfaces of the millstones, as a result of which the flour contains a large percentage of the most important components of the grain. The stone mill’s drive should provide a low rotational speed of the mills (peripheral speed up to 10 m/sec.) and the possibility of smooth control of its speed and torque without reducing the performance of the mill. From this point of view, it is promising to use in the mill’s drive, instead of asynchronous motors, rotation with additional devices (gearboxes, belt drives, V-belt drives, etc.) of flat asynchronous electric drives. The article suggests possible variants of technical solutions for stone mills with flat electric drives. It was concluded that the use of a flat asynchronous motor in the mill’s drive allows not only smoothly adjusting the frequency and torque of the millstones, but also because of the presence of edge effects, to prevent flour sticking in the millstone working zone. Compiled with the possibility of solving by analytical methods a mathematical model of mill’s drive, based on a flat electric drives, taking into account the longitudinal edge effect, the strength of viscous (internal) and dry (external) friction. The mechanical characteristics of the drive were found when moving the flat electric drives inductors and the dependencies of the change in the mill productivity on the millstone rotation frequency when grinding various grains, changing the fill factor of the grinding zone and the gap between the millstones were obtained.

Research of Non-Sinusoidal Voltage in Frequency Converter of Medium Power Operation

2015 ◽  
Vol 792 ◽  
pp. 8-14
Author(s):  
Gennady Petrovich Kornilov ◽  
Ildar Ravil’evich Abdulveleev ◽  
Timur Rifkatovich Khramshin
Keyword(s):  
Comparative Analysis ◽  
Electric Drive ◽  
Power Grid ◽  
Frequency Converter ◽  
Harmonic Distortion ◽  
Structural Modeling ◽  
Harmonic Structure ◽  
Sinusoidal Voltage ◽  
Voltage Curve ◽  
Power Operation

The article presents the comparative analysis of influence frequency regulated electric drive and current electric drive to harmonic structure of voltage of power grid. There was obtained the dependence of total harmonic distortion (THD) of curve on loading power for 2 types of valve converters. The effectiveness is shown in use of filter compensating device, connected at low side of converting transformer. There were defined the ranges of filter adjusting for improving THD of voltage curve. The described solutions are performed by the structural modeling method of Simulink packet in Matlab environment.

scholarly journals Developing simulation models for precise adjustment and debugging of ship frequency inverters

2020 ◽  
Vol 2020 (4) ◽  
pp. 95-104
Author(s):  
Sergey Grigoryevich Cherniy ◽  
Aleksandr Sergeevich Sobolev ◽  
Pavel Andreevich Erofeev
Keyword(s):  
Energy Efficiency ◽  
Electric Drive ◽  
Frequency Control ◽  
Frequency Converter ◽  
Operating Mode ◽  
Compressed Air ◽  
Load Factor ◽  
Stable Operation ◽  
Compressor Unit ◽  
Advantages And Disadvantages

The paper describes a variable frequency drive which consists of two elements: an electric drive (synchronous or asynchronous electric drives, that is, drives powered by alternating current are used in capacity of it), and a frequency converter able to control the amplitude and frequency of the voltage supplied to the drive. It becomes possible to control the speed of rotation of the electric motor and the torque on its shaft. The most optimal energy efficiency when using compressor units is achieved under the operating mode when its average daily load factor makes at least 85%. Under the mentioned operating mode fluctuations during the compressed air consumption will be minimal, and the most stable operation of the compressor at its rated nominal power is ensured. In practice, no more than 15% of all the industrial compressors are operated in such operating mode. For 85% of the compressor units the question of improving energy efficiency by regulating its capacity remains open. The method of capacity regulation by using a frequency converter is currently the most optimal and perfect, because adjusting the parameters of the electric drive in this way, the most accurate regulation of the compressed air pressure is provided, which allows reducing the energy consumption in the compressed air injection process, as well as extending the service life of the equipment used. There has been considered a device with frequency control of a compressor unit, debugging of which was carried out on the basis of a mathematical model, which allows choosing the most optimal parameters for frequency control of an electric drive of a compressor unit in order to increase energy efficiency. The analysis of all the advantages and disadvantages of frequency regulation is being carried out, as well as a comparative analysis for selecting the optimal frequency converter in terms of the import substitution

scholarly journals Control system for a frequency synchronized asynchronous electric drive

2021 ◽  
Vol 23 (3) ◽  
pp. 131-141
Author(s):  
V. N. Meshcheryakov ◽  
D. S. Sibirtsev ◽  
S. Valtchev ◽  
E. I. Gracheva
Keyword(s):  
Energy Efficiency ◽  
Control System ◽  
Electric Drive ◽  
Frequency Control ◽  
Frequency Converter ◽  
Mutual Orientation ◽  
Asynchronous Electric Drive ◽  
In Series ◽  
Output Characteristics ◽  
Rotor Winding

THE PURPOSE. In controlled AC drives used on continuous-action mechanisms, which include conveyors, conveyors, cranes, the most widespread are asynchronous motors with a phase rotor, controlled mainly along the rotor circuit using various regulators with low energy efficiency. To improve the energy efficiency of an electric drive based on ADFR, it is proposed to develop a control system that combines the principles of frequency control of the motor along the stator circuit and powering the rotor circuit with constant voltage, which allows the electric drive to be considered synchronized. METHODS. The presence of a DC link in the frequency converter makes it possible in principle to connect the rotor winding in series to this link. However, in order to ensure the frequency principle of regulating the output characteristics of the electric drive, it will be necessary to regulate the rectified current at the input of the inverter and, accordingly, in the rotor windings, which will require a significant change in the standard control system of the frequency converter. The use of an additional adjustable switch in the DC link is proposed. RESULTS. The study of the proposed non-standard control system for a frequency asynchronous synchronized electric drive was carried out by the method of simulation modeling in the Matlab Simulink software package. CONCLUSION. A control system for a frequency asynchronous synchronized electric drive has been developed and investigated on a computer model. A correction system is proposed that allows maintaining a constant value of the load angle in the starting mode. The scalar system of relay frequency control of the electric drive is supplemented with vector correction of the variables, which makes it possible to continuously provide the necessary mutual orientation of the stator current vectors and the rotor flux linkage.

scholarly journals Synthesis of a scalar ACS of the valve motor rotational speed for the icebreaker's ERM with a propulsion-steering complex "Azipod"

2021 ◽  
pp. 207-214
Author(s):  
В.Е. Высоцкий ◽  
С.А. Конева ◽  
И.Ю. Марков ◽  
В.М. Цалоев
Keyword(s):  
Electric Drive ◽  
Rotational Speed ◽  
Dynamic Properties ◽  
Frequency Control ◽  
Structural Complexity ◽  
Steering System ◽  
Electromagnetic Excitation ◽  
Electromechanical Energy Conversion ◽  
Drive Systems ◽  
Valve Engine

В статье рассматриваются основные тенденции развития систем судового автоматизированного электропривода с машинами переменного тока. В частности представлены варианты реализации электропривода с использованием частотно управляемых асинхронных двигателей и синхронных двигателей с электромагнитным возбуждением. Предлагается перспективная электромеханическая система на основе вентильного двигателя для ГЭУ ледокола с движительно-рулевым комплексом «Азипод». Целью работы является исключение структурной сложности и повышения функциональных возможностей электропривода за счет применения скалярной САУ частоты вращения вентильного двигателя вместо векторной для ГЭУ. Новизна заключается в использовании подхода и представления вентильного двигателя как объекта регулирования на основе аналогии с коллекторным двигателем постоянного тока при регулировании положения его оси токосъема. В соответствии с этим анализ информационных процессов, связанных с процессами электромеханического преобразования энергии, протекающими в синхронной машине с позиционно-зависимым частотным управлением, и синтез САУ электропривода по принципу подчиненного регулирования базируются на тех подходах, которые широко используются в регулируемых электроприводах постоянного тока, обладающих наилучшими динамическими свойствами. The article discusses the main trends in the development of marine automated electric drive systems with AC machines. In particular, variants of the implementation of an electric drive using frequency-controlled asynchronous motors and synchronous motors with electromagnetic excitation are presented. A promising electromechanical system based on a valve engine for the icebreaker's ERM with the propulsion-steering system Azipod is proposed. The aim of the work is to eliminate the structural complexity and to increase the functionality of the electric drive by using a scalar ACS of the valve motor rotational speed instead of a vector one for the ERM. The novelty lies in the use of the approach and representation of the valve motor as an object of regulation based on the analogy with the collector DC motor when regulating the position of its current collection axis. Thereby, the analysis of information processes related to the processes of electromechanical energy conversion occurring in a synchronous machine with position-dependent frequency control, and the synthesis of an ACS electric drive based on the principle of subordinate regulation are based on those approaches that are widely used in regulated DC electric drives possessing the best dynamic properties.

scholarly journals Control system for a frequency synchronized asynchronous electric drive

2021 ◽  
Vol 23 (3) ◽  
pp. 116-126
Author(s):  
V. N. Meshcheryakov ◽  
D. S. Sibirtsev ◽  
S. Valtchev ◽  
E. I. Gracheva
Keyword(s):  
Energy Efficiency ◽  
Control System ◽  
Electric Drive ◽  
Frequency Control ◽  
Frequency Converter ◽  
Mutual Orientation ◽  
Asynchronous Electric Drive ◽  
In Series ◽  
Output Characteristics ◽  
Rotor Winding

THE PURPOSE. In controlled AC drives used on continuous-action mechanisms, which include conveyors, conveyors, cranes, the most widespread are asynchronous motors with a phase rotor, controlled mainly along the rotor circuit using various regulators with low energy efficiency. To improve the energy efficiency of an electric drive based on ADFR, it is proposed to develop a control system that combines the principles of frequency control of the motor along the stator circuit and powering the rotor circuit with constant voltage, which allows the electric drive to be considered synchronized. METHODS. The presence of a DC link in the frequency converter makes it possible in principle to connect the rotor winding in series to this link. However, in order to ensure the frequency principle of regulating the output characteristics of the electric drive, it will be necessary to regulate the rectified current at the input of the inverter and, accordingly, in the rotor windings, which will require a significant change in the standard control system of the frequency converter. The use of an additional adjustable switch in the DC link is proposed. RESULTS. The study of the proposed non-standard control system for a frequency asynchronous synchronized electric drive was carried out by the method of simulation modeling in the Matlab Simulink software package. CONCLUSION. A control system for a frequency asynchronous synchronized electric drive has been developed and investigated on a computer model. A correction system is proposed that allows maintaining a constant value of the load angle in the starting mode. The scalar system of relay frequency control of the electric drive is supplemented with vector correction of the variables, which makes it possible to continuously provide the necessary mutual orientation of the stator current vectors and the rotor flux linkage.

scholarly journals STABILITY OF ANONLINEAR SYSTEM «FREQUENCY CONVERTER-ASYNCHRONOUS MOTOR»

2021 ◽  
Vol 447 (3) ◽  
pp. 124-128
Author(s):  
K.T. Tergemes ◽  
A.R. Karassayeva ◽  
A. Zh. Sagyndikova ◽  
Zh.K. Orzhanova ◽  
Е. Shuvalova
Keyword(s):  
Transfer Function ◽  
Mathematical Description ◽  
Block Diagram ◽  
Frequency Converter ◽  
Asynchronous Motor ◽  
Symbolic Form ◽  
Frequency Converters ◽  
Asynchronous Motors ◽  
The Stability ◽  
System Frequency

In modern industry, various industries are widely used frequency converters (FС) to control the speed of rotation of asynchronous motors. Widely used frequency converters that feed asynchronous motors allow you to optimize production, reduce electrical energy consumption, increase the service life of equipment, etc. The article considers the system "frequency converter-asynchronous motor" as a complex nonlinear automatic control system. On the basis of the linearized transfer function of the frequency converter and the asynchronous motor, the block diagram of the open system "frequency converter - asynchronous motor"is made. The mathematical description of the system is written by algebraic controls in symbolic form. A program for generating the transfer function and calculating the roots of the characteristic equation using the MATLAB application package is presented. To determine the stability of the frequency converter - asynchronous motor system, a program is compiled where the stability of the system is determined by the characteristic roots of the equation. The transient curve of the speed and torque of an asynchronous motor confirms the adequacy of the block diagram "frequency converter-asynchronous motor" and its mathematical description.

scholarly journals Regulation of the temperature of an individual heat point by changing the speed of the asynchronous motor

2021 ◽  
Vol 23 (4) ◽  
pp. 156-165
Author(s):  
T. V. Sinyukova ◽  
A. V. Sinyukov
Keyword(s):  
Mathematical Model ◽  
Electric Drive ◽  
Optimal Algorithm ◽  
Frequency Converter ◽  
Asynchronous Motor ◽  
Control Valve ◽  
Electric Pump ◽  
First Case ◽  
Energy Consuming ◽  
Heat Point

THE PURPOSE. To develop and investigate a mathematical model of an operating object – an individual heat point with two methods of controlling the temperature of the coolant. In the first case, the control of the temperature of the coolant is considered, with the help of a control valve installed on a real object. In the second case, a more reliable and less energy-consuming solution is proposed – replacing the control valve with a frequency- controlled electric drive operating according to the proposed optimal algorithm. METHODS. When solving this problem, the method of computer simulation modeling, implemented by means of Matlab Simulink, was used.RESULTS. The article deals with the problems that arise during the operation of an individual heating point. Possible solutions to the problem associated with the failure of the control valve are given. A solution for regulating the temperature of the coolant is proposed, based on the use of a frequency-controlled electric drive of the electric pump. To implement the proposed solution, no redevelopment of the premises is required, only the installation of a frequency converter on the pump already available in the device of an individual heat station is necessary. CONCLUSION. The conducted research has a practical focus, since the proposed solution is implemented at the existing facility. The use of a frequency-controlled electric drive of a centrifugal pump made it possible to increase the reliability of the existing facility. The results obtained during the simulation allow us to draw a conclusion about the feasibility of using the proposed solution.

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