scholarly journals Operational reliability of low-voltage asynchronous motors at asymmetrical supply voltage

2019 ◽  
Vol 139 ◽  
pp. 01053
Author(s):  
Victoria Romanova ◽  
Sergey Khromov
Keyword(s):  
Low Voltage ◽  
Supply Voltage ◽  
Asynchronous Motor ◽  
Operational Reliability ◽  
Motor Shaft ◽  
Operating Modes ◽  
Squirrel Cage ◽  
Asynchronous Motors ◽  
Technical Solutions ◽  
Supply Systems

Issues of operating modes of 4A series asynchronous squirrel-cage motors and AI serried motors at asymmetrical supply voltage for different values of motor shaft load are considered on the basis of simulation using Matlab software package and Simulink package. In the simulation, currents in asynchronous motor phases were evaluated as a function of K2U, KZ, and based on these results, permissible operation parameters were evaluated for induction motors. The results obtained are the basis for technical solutions aimed at improving operational reliability of asynchronous motors, they will allow taking into account permissible operating parameters of asynchronous motors not only in the design, but also in operation in power supply systems of various facilities.

scholarly journals Formation of energy efficient start-brake modes of the frequency-controlled electric drive in production mechanism

2019 ◽  
Vol 104 ◽  
pp. 01006
Author(s):  
Maxim Filimonov ◽  
Nicolay Karnaukhov ◽  
Eugeny Lukyanov ◽  
Dmitry Smyatsky ◽  
Roman Mironenko
Keyword(s):  
Energy Efficient ◽  
Supply Voltage ◽  
Asynchronous Motor ◽  
Electrical Power ◽  
Production Mechanism ◽  
Mass Model ◽  
Electrical Drive ◽  
Asynchronous Motors ◽  
Production Mechanisms ◽  
Nominal Mode

this article the energy efficient frequency way of starting of production mechanisms electrical drive with low power asynchronous motors (from 90 Wt to 5 kWt) is proposed. To provide this With the goal of electrical losses decreasing during asynchronous motor starting the Pontryagin Maximum Principle have been applied by the authors when analysing of two-mass model of production mechanism frequency controlled electrical drive. In result of calculations for frequency controlled electrical drive of production mechanism with 90 Wt power asynchronous motor of the model 4AA50A2 Dependencies of amplitude and frequency of supply voltage by the time are obtained. These dependencies confirm possibility of decreasing the electrical power losses with different values of motor shaft load torques. In compare with the other ways of asynchronous motor starting (for example U/f=const) they allow to decrease the electrical losses more then two times in nominal mode.

The Boot Method Analysis of Three-Phase Asynchronous Motor

2013 ◽  
Vol 401-403 ◽  
pp. 308-311 ◽  
Author(s):  
Miao Shang ◽  
Guo Min Lin ◽  
Qiang Hua Guo ◽  
Yong Tao Sun
Keyword(s):  
Asynchronous Motor ◽  
Advantages And Disadvantages ◽  
Squirrel Cage ◽  
Asynchronous Motors ◽  
Three Phase ◽  
Method Analysis ◽  
Starting Torque

The boot method of three wound-rotor asynchronous motors and three-phase squirrel-cage asynchronous motor are described; As to reduce the start current and to increase the starting torque, the principle of all kinds of startup methods are analyzed; the advantages and disadvantages of various starting methods are evaluated; Development directions of modern motor startup are pointed out.

scholarly journals Modeling of thermal process in the energy system “Electrical network - asynchronous motor”

2021 ◽  
Vol 280 ◽  
pp. 05003
Author(s):  
Vitaliy Kuznetsov ◽  
Mykola Tryputen ◽  
Valerii Tytiuk ◽  
Zhanna Rozhnenko ◽  
Serhii Levchenko ◽  
...  
Keyword(s):  
Supply Voltage ◽  
Asynchronous Motor ◽  
Energy System ◽  
Electrical Network ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Real Process ◽  
Asynchronous Motors ◽  
Electromechanical Converter ◽  
Energy Economic Model

The paper discusses the influence of low-quality electricity on the temperature modes of operation of an asynchronous motor. In the course of experimental and analytical studies, the heat transfer coefficients and heat capacity of a particular electromechanical converter were determined. Experimental and analytical dependences of temperature changes of an asynchronous motor on time are given when it is connected to a supply voltage with different coefficients of sinusoidal distortion and negative sequence. The resulting model is tested for its adequacy to the real process and can be used as an element in the energy-economic model of an asynchronous motor to assess its uptime. This model that can be useful for simulation of thermal processes in asynchronous motors and optimising these devices for increasing the reliability.

scholarly journals Effect of asymmetry of supply voltages on asynchronous motor operation modes

2018 ◽  
Vol 58 ◽  
pp. 03013
Author(s):  
Victoria Romanova ◽  
Sergey Khromov
Keyword(s):  
Asynchronous Motor ◽  
Motor Shaft ◽  
Simulation Experiments ◽  
Software Complex ◽  
Voltage Unbalance ◽  
Operation Modes ◽  
Asynchronous Motors ◽  
Package Program ◽  
Supply Voltages ◽  
Motor Operation

Effect of asymmetry of supply voltages on asynchronous motor operation modes was investigated using the computer-aided simulation experiments, the software complex Matlab and the package program Simulink. Publication relevance is determined by the necessity for performance of comparative analysis of the level of effect of asymmetry of supply voltages on asynchronous motors of different series and power capacities. Six motors of three different power capacities (5.5, 55, 160 kW) and of two different series (4A, AI) were modeled for investigation. The value of asymmetry of supply voltages was changed from 0 to 5%. The motor shaft load was changed from 0 to 120% of the motor rated load. Comparison of dependencies of the phase currents on the voltage unbalance ratio by reverse sequence (K2U) of asynchronous motors with short-circuited rotor series 4A and AI was made. The analysis and discussion of obtained investigation results were performed, recommendations on operation of asynchronous motors series 4A and AI in conditions of asymmetry of supply voltages were given.

scholarly journals TRANSIENT STATE CHARACTERIZATION OF ASYNCHRONOUS MOTORS IN MODERN LOW-VOLTAGE ELECTRIC INSTALLATIONS

2018 ◽  
Vol 18 (1) ◽  
pp. 19-25 ◽  
Author(s):  
Emil Cazacu ◽  
Valentin Ioniţă ◽  
Lucian Petrescu
Keyword(s):  
Low Voltage ◽  
Asynchronous Motor ◽  
Transient State ◽  
Electric Utility ◽  
Asynchronous Motors ◽  
Start Up ◽  
Inrush Currents ◽  
Large Application ◽  
Drive Systems ◽  
Electric Motor Drive

Abstract: Low-voltage asynchronous motor is the most common load used in any industrial electric facility. Due to their robustness and reliability, the induction motors have a very large application spectrum and are to be found in a variety of power units. It is assumed that over 70% of total energy used in any electric utility is dedicated to the electric motor drive systems. The paper quantitatively studies the transient state of such motors, which occurs at their start-up. The waveforms characteristics of these inrush currents are predetermined mainly by solving the associated differential equations that describe the dynamic phenomena at their start-up. An experimental investigation on an induction motor of 4 kW is also carried out. Supplementary, different solutions for the energising of these low-voltage motors are presented highlighting their performances and limits. These methods are critically rated according to their mitigation ability of the power quality issues associated with the energizing process.

scholarly journals Utilization of Two Sensors in Offline Diagnosis of Squirrel-Cage Rotors of Asynchronous Motors

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6573
Author(s):  
Petr Kacor ◽  
Petr Bernat ◽  
Petr Moldrik
Keyword(s):  
Asynchronous Motor ◽  
High Standard ◽  
Casting Process ◽  
Element Model ◽  
Test System ◽  
Production Costs ◽  
Production Cycle ◽  
Continuous Control ◽  
Squirrel Cage ◽  
Asynchronous Motors

In the manufacture squirrel-cage rotors of asynchronous motors, a high standard of quality is required in every part of the production cycle. The die casting process usually creates porosity in the rotor bars. This most common defect in the rotor often remains hidden during the entire assembly of the machine and is usually only detected during final testing of the motor, i.e., at the end of the production process. This leads to unnecessary production costs. Therefore, the aim is to conduct a continuous control immediately after the rotor has been cast before further processing. In our paper, we are interested in selecting a suitable method of offline rotor diagnostics of an asynchronous motor that would be effective for these needs. In the first step, the selection of the method and its integration into the overall manufacturing process is carried out. The arrangement of the sensors and their calibration is then simulated on a 2D Finite Element Model of the rotor. The proposed offline measurement procedures and technologies are finally validated by testing measurements on a rotor that simulates the most frequently occurring faults. A test system is also developed that provides the operator continuous information about the running rotor measurements and makes it easier to evaluate the quality of the cast rotor by means of graphical visualization of the faults.

scholarly journals Analysis of influencing factors affecting the operational reliability of low-voltage asynchronous electric motors

2021 ◽  
Vol 23 (3) ◽  
pp. 95-104
Author(s):  
V. V. Romanova ◽  
S. V. Khromov ◽  
K. V. Suslov
Keyword(s):  
Influencing Factors ◽  
Electric Motor ◽  
Low Voltage ◽  
Operational Reliability ◽  
Operating Conditions ◽  
Electric Motors ◽  
Asynchronous Motors ◽  
Reverse Sequence ◽  
Stress Asymmetry ◽  
Asynchronous Electric Motors

THE PURPOSE. The main purpose of the work is a comprehensive study of external influences that affect the operational reliability of low-voltage asynchronous motors. Attention is focused on the evaluation of the operational reliability of electric motors, the systematization of their operating conditions, with the simultaneous impact of a group of operational factors. Among these factors that are subject to detailed analysis, we will highlight the following: the asymmetry of the stress and its duration, loading of the motor, the temperature of the environment. In this regard, it becomes obvious that the task of improving the operational reliability of low-voltage asynchronous electric motors depends on a qualitative study of the quantitative values of external influencing factors in various operating modes of electric motors. METHODS. The tool for implementing this task is a visual and effective simulation tool Simulink interactive programming environment Matlab. RESULTS. The research was performed on an asynchronous electric motor with a short-circuited rotor AIR160S8 with PH = 7,5 kW, rated speed n = 1500 rpm. The physical processes of the electric motor under study were modeled by changing the following parameters: the coefficient of stress asymmetry in the reverse sequence (K2U), the load on the motor shaft (Kz), the ambient temperature (tocr), and the duration of stress asymmetry in the reverse sequence (T). Based on the obtained simulation results, groups of planes of the studied quantities are constructed. CONCLUSION. A set of studies performed using the Matlab software package allowed us to estimate the limits of acceptable values of external factors and identify the area of acceptable operation of asynchronous motors. The analysis and discussion of the research results were carried out, and measures were proposed to improve the operational reliability of asynchronous electric motors.

DESIGN OF HIGH-RESOLUTION (12-14 BIT) MULTI-CHIP CONVEYOR ADCS WITH 0.5-1 GHZ CONVERSION FREQUENCY

2019 ◽  
Vol 12 (2) ◽  
pp. 38-51
Author(s):  
Владимир Кононов ◽  
Vladimir Kononov
Keyword(s):  
Dynamic Range ◽  
Low Voltage ◽  
Supply Voltage ◽  
Signal To Noise Ratio ◽  
Cmos Technology ◽  
Design Standards ◽  
Conversion Frequency ◽  
Code Type ◽  
Technical Solutions ◽  
Gain Equalization

Low-voltage amplifiers of telescopic type based on CMOS technology with design norms of 180 nm and 60 nm are investigated. It is established that the best characteristics of nonlinearity in the frequency range up to 250 MHz have amplifiers manufactured by technology with design standards of 180 nm. It is shown that amplifiers of the folded CAS-code type with a supply voltage of 2.5-3 V and cascade transistors with maximum permissible interelectrode voltages of 1.2-1.8 V can degrade and even catastrophically fail when exposed to TKCH. Technical solutions for calibration of bias and gain equalization of channels in the creation of 4-channel 12-14-bit ADC with conversion frequency up to 1 GHz and 0.5 GHz are considered. It is shown that the multi-chip use of this type of ADC in the form of microassemblies allows to achieve typical values of integral nonlinearity, signal-to-noise ratio and dynamic range.

scholarly journals Analysis of influencing factors affecting the operational reliability of low-voltage asynchronous electric motors

2021 ◽  
Vol 23 (3) ◽  
pp. 80-89
Author(s):  
V. V. Romanova ◽  
S. V. Khromov ◽  
K. V. Suslov
Keyword(s):  
Influencing Factors ◽  
Electric Motor ◽  
Low Voltage ◽  
Operational Reliability ◽  
Operating Conditions ◽  
Electric Motors ◽  
Asynchronous Motors ◽  
Reverse Sequence ◽  
Stress Asymmetry ◽  
Asynchronous Electric Motors

THE PURPOSE. The main purpose of the work is a comprehensive study of external influences that affect the operational reliability of low-voltage asynchronous motors. Attention is focused on the evaluation of the operational reliability of electric motors, the systematization of their operating conditions, with the simultaneous impact of a group of operational factors. Among these factors that are subject to detailed analysis, we will highlight the following: the asymmetry of the stress and its duration, loading of the motor, the temperature of the environment. In this regard, it becomes obvious that the task of improving the operational reliability of low-voltage asynchronous electric motors depends on a qualitative study of the quantitative values of external influencing factors in various operating modes of electric motors. METHODS. The tool for implementing this task is a visual and effective simulation tool Simulink interactive programming environment Matlab. RESULTS. The research was performed on an asynchronous electric motor with a short-circuited rotor AIR160S8 with PH = 7,5 kW, rated speed n = 1500 rpm. The physical processes of the electric motor under study were modeled by changing the following parameters: the coefficient of stress asymmetry in the reverse sequence (K2U), the load on the motor shaft (Kz), the ambient temperature (tocr), and the duration of stress asymmetry in the reverse sequence (T). Based on the obtained simulation results, groups of planes of the studied quantities are constructed. CONCLUSION. A set of studies performed using the Matlab software package allowed us to estimate the limits of acceptable values of external factors and identify the area of acceptable operation of asynchronous motors. The analysis and discussion of the research results were carried out, and measures were proposed to improve the operational reliability of asynchronous electric motors.

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