scholarly journals Automatic Temperature Regulation System of Locomotive Traction Induction Motors With Power Losses Minimization

2015 ◽  
Vol 9 (1) ◽  
Author(s):  
A. S. Kosmodamianskiy ◽  
V. I. Vorobiev ◽  
A. A. Pugachev
Keyword(s):  
Induction Motor ◽  
Temperature Regulation ◽  
Induction Motors ◽  
Frequency Converter ◽  
Operating Mode ◽  
Regulation System ◽  
Air Cooling ◽  
Power Losses ◽  
Automatic Temperature ◽  
Stator Current

The air cooling systems are shown to be used to provide required temperature condition of traction induction motors on locomotives. The automatic temperature regulation system is developed for its using to solve such a task. Results of experimental investigation showed that the AO63-4 induction motor stator end winding on the side opposite to air supply is the most heated part of the induction motor. Based on the results of the research, it was used an aperiodic second-order transfer function for approximation of the thermal transient curves. The design of an induction motor control system maintaining operating mode with minimum of the stator current are considered. It is shown that the modes of minimum of the stator current and minimum of power losses are quite close to each other. The MatLab simulation results taking typical nonlinearities and iron power losses in an induction motor and conduction and commutation power losses in semiconductors of frequency converter into account are presented. It is shown that as a result of application of the suggested system the power losses reduction may be led up to 20 % relatively to classical scalar control.

scholarly journals The Application of the Bispectrum Analysis to Detect the Rotor Unbalance of the Induction Motor Supplied by the Mains and Frequency Converter

Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 3009
Author(s):  
Pawel Ewert
Keyword(s):  
Spectral Analysis ◽  
Fourier Transform ◽  
Induction Motor ◽  
Induction Motors ◽  
Frequency Converter ◽  
Experimental Tests ◽  
Test Mass ◽  
Mechanical Vibrations ◽  
Stator Current

This article presents the effectiveness of bispectrum analysis for the detection of the rotor unbalance of an induction motor supplied by the mains and a frequency converter. Two diagnostic signals were analyzed, as well as the stator current and mechanical vibrations of the tested motors. The experimental tests were realized for two low-power induction motors, with one and two pole pairs, respectively. The unbalance was modeled using a test mass mounted on a specially prepared disc and directly on the rotor and the influence of this unbalance location was tested and discussed. The results of the bispectrum analysis are compared with results of Fourier transform and the effectiveness of unbalance detection are discussed and compared. The influence of the registration time of the analyzed signal on the quality of fault symptom analyses using both transforms was also tested. It is shown that the bispectrum analysis provides an increased number of fault symptoms in comparison with the classical spectral analysis as well as it is not sensitive to a shorter registration time of the diagnostic signals.

scholarly journals Results of the experimental investigationof thermal processes in induction motor.

2015 ◽  
Vol 2015 (3) ◽  
pp. 77-82
Author(s):  
Александр Пугачев ◽  
Aleksandr Pugachev ◽  
Денис Бондаренко ◽  
Denis Bondarenko
Keyword(s):  
Induction Motor ◽  
Induction Motors ◽  
Frequency Converter ◽  
Physical Models ◽  
Thermal Processes ◽  
Rotor Speed ◽  
Current Frequency ◽  
Electric Drives ◽  
Stator Current ◽  
Heating And Cooling

The adequacy of researches of characteristics of the traction electric drives with an induction motors by means of scaled physical models is proved by application of two induction motors, 380 and 14 kW. The system of data acquisition and sensors applied to it is described. The technique and results of experimental investigation of thermal processes of heating and cooling in the 14 kW induction motor fed by frequency converter with scalar control and IR-compensation under the low values of the stator current frequency and rotor speed are presented. The rotor bars of the induction motor are determined to be most stressed by overheating under the stator current frequency closed to null, the stator winding becomes the most overheated unit of the induction motor under higher values of the stator current frequency.

scholarly journals Performance and Analysis of Indirect Torque Control-Based Three-Phase Induction Motor

ELKHA ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 122
Author(s):  
Andri Pradipta ◽  
Santi Triwijaya ◽  
Mohamad Ridwan
Keyword(s):  
Control System ◽  
Induction Motor ◽  
Induction Motors ◽  
Control Method ◽  
Torque Control ◽  
Stator Current ◽  
Speed Controller ◽  
Three Phase ◽  
20 Nm ◽  
Speed Response

Induction motors are widely used in industrial processes, vehicles and automation. Three-phase induction motors can be used for traction systems on electric locomotives. In this case, the speed control system is an important thing that must be applied to the propulsion system. This study aimed to test the indirect torque control for a Three-phase induction motor. A proportional integral (PI) controller was applied for speed controller. The indirect torque control system was modeled and simulated using PSIM software. According to the result, the control method showed a good performance. The speed could be maintained even the speed reference was changing or a load was applied. The steady state error of the speed response was just 0.1% with rise time around 0.06 s. The stator current went up to 39.5 A in starting condition. The stator current reached 12 A rms when the load of 10 Nm was applied. Then, the current rose to 15.7 A rms when the load was increased to 40 Nm and the current came down to 12.8 A rms when the load was decreased to 20 Nm.

scholarly journals Effects of the Slot Harmonics on the Stator Current in an Induction Motor with Bearing Fault

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Xiangjin Song ◽  
Jingtao Hu ◽  
Hongyu Zhu ◽  
Jilong Zhang
Keyword(s):  
Induction Motor ◽  
Analytical Approach ◽  
Induction Motors ◽  
Experimental Tests ◽  
Fault Models ◽  
Popular Method ◽  
Bearing Faults ◽  
Bearing Fault ◽  
Stator Current ◽  
Theoretical Inference

Bearing faults are the most frequent faults of induction motors. The current spectrum analysis is an easy and popular method for the monitoring and detection of bearing faults. After a presentation of the existing fault models, this paper illustrates an analytical approach to evaluate the effects of the slot harmonics on the stator current in an induction motor with bearing fault. Simple and clear theoretical analysis results in some new current characteristic frequencies. Experimental tests with artificial bearing outer raceway fault are carried out by measuring stator current signals. The experimental results by spectral analysis of the stator current agree well with the theoretical inference.

A Comparative Study of PWM Techniques for Multiphase Induction Motor Drives

2018 ◽  
Vol 19 (5) ◽  
Author(s):  
Mo. Suhel A. Shaikh ◽  
Rakesh Maurya
Keyword(s):  
Induction Motor ◽  
Induction Motors ◽  
Harmonic Distortion ◽  
Motor Drives ◽  
Current Waveform ◽  
Induction Motor Drives ◽  
Distortion Factor ◽  
Stator Current ◽  
Three Phase

Abstract This paper deals with the performance analysis of different PWM techniques for three-phase and dual three-phase induction motors. In this paper, the dual three-phase induction motor is reconnected as a three-phase and six-phase winding configurations and its performances are investigated. The comparative evaluation for the aforesaid machine configurations are carried out in terms of quality of stator current waveform with different PWM techniques. Total harmonic distortion are obtained in terms of harmonic distortion factor for stator current. The theoretical findings are further verified through simulation and experimental results.

ARM-Based Speed Regulating System for Asynchronous Motor

2014 ◽  
Vol 852 ◽  
pp. 686-691
Author(s):  
Shao Qing Zhou ◽  
Cong Li Mei ◽  
Guo Hai Liu ◽  
Wen Tao Huang ◽  
Dong Xin Shu
Keyword(s):  
Control System ◽  
Induction Motor ◽  
Pulse Width ◽  
Simple Structure ◽  
Induction Motors ◽  
Asynchronous Motor ◽  
Electronic Devices ◽  
Regulation System ◽  
Variable Frequency ◽  
Speed Regulation

Owing to their simple structure and stability, AC induction motors have been widely used in many fields. With the development of electronic devices, variable-frequency speed regulation system of the induction motor is widely used. This paper introduces an ARM chip controller LM3S818 from Texas Instruments in detail as a microprocessor of the variable frequency speed regulation system for asynchronous motor. The main circuit of AC-DC-AC Variable frequency way is adopted and the control system is based on Space Vector Pulse Width Module. The hardware structure and the design of software both are presented. And experimental results show the good performance in different frequency.

Bearing Fault Diagnostic of Induction Motor by Stator Currents Analysis Based on Park’s Vectors Approach

2014 ◽  
Vol 698 ◽  
pp. 83-89 ◽  
Author(s):  
Nail Safin ◽  
Vladimir Prakht ◽  
Vladimir Dmitrievskii
Keyword(s):  
Fault Diagnosis ◽  
Early Detection ◽  
Induction Motor ◽  
Induction Motors ◽  
Bearing Fault ◽  
Bearing Fault Diagnosis ◽  
Stator Current ◽  
Bearing Defects ◽  
Bearing Damage ◽  
Vector Approach

This paper deals with the possibilities of bearing fault diagnosis of induction motors by stator currents analysis based on Park’s vector approach. The main theoretical aspects, the experimental results and their analysis are presented. It is shown that preventive stator current diagnostics of induction motors based on Park’s vector allows us early detection of bearing defects in the inner and outer races. The current spectra additional harmonics appearing in the case of bearing damage are found.

scholarly journals Pengaruh Kinerja Motor Induksi Pada Tegangan Tidak Seimbang Dengan Metode Transformasi Direct Qudrature

AVITEC ◽  
2019 ◽  
Vol 1 (1) ◽  
Author(s):  
Paulus Setiawan
Keyword(s):  
Induction Motor ◽  
Electromagnetic Induction ◽  
Induction Motors ◽  
Electrical Power ◽  
Transformation Method ◽  
Phase Voltage ◽  
Electrical Power System ◽  
Stator Current ◽  
Three Phase ◽  
Unbalanced Voltage

Induction motors are one type of electric motors that work based on electromagnetic induction. The problem that often arises lately is the occurrence of voltage imbalances. Unbalanced voltage is a voltage value that is not the same in a three-phase voltage system contained in the electrical power system. On the basis of these problems, it is necessary to conduct research that can analyze the dynamics of the performance of an induction motor. Dynamic analysis is done by modeling a three-phase induction motor using an arbitrary reference frame with the direct qudrature transformation method in Matlab/Simulink. In studies with voltage imbalances up to 5%, electromagnetic torque has decreased by 2.89% to 13.83% and stator current in one phase has increased by 29.1% to 245.8%.

scholarly journals The Re-examination of Adjustment of the Rotor Magnetic Field Observer in the Induction Motor

2013 ◽  
Vol 4 (1) ◽  
pp. 38-44
Author(s):  
Alexander Burkov ◽  
Evgenii Krasilnikyants ◽  
Alexander Smirnov ◽  
Georgy Bouldukan
Keyword(s):  
Magnetic Flux ◽  
Induction Motor ◽  
Induction Motors ◽  
Motor Drives ◽  
Fine Tuning ◽  
Active Components ◽  
Induction Motor Drives ◽  
Flux Observer ◽  
Stator Current ◽  
Constant Magnitude

Abstract Wide use of induction motor drives makes the problems related to induction motors very topical. One of such problems is the maximal utilization of torque and velocity of induction motors. In this regard the use and accurate adjustment of rotor magnetic flux observers may be helpful. The technique of observer adjustment is subject of special interest. This technique can be regarded as optimal if it ensures constant acceleration that, in turn, corresponds to constant magnitude of active and magnetizing components of stator current. In contrast, nonoptimal tuning of the magnetic flux observer creates a transient response caused by variation of magnetic and active components of the stator current resulting in changing acceleration of the motor. However, the parameters of non-optimal process can be used for fine tuning of the observer which considers the variation of the time constants obtained analyzing the drive's magnetic circuit saturation. It is possible to conclude that implementation of fine adjustment of rotor magnetic flux observer is of critical importance for induction motor torque and velocity maximum utilization.

scholarly journals Determination of the Sufficient Inductance of AC Line Reactor at the Input of Frequency Converter

2019 ◽  
Vol 11 (1) ◽  
pp. 25-29 ◽  
Author(s):  
M Yu Pustovetov
Keyword(s):  
Steady State ◽  
Induction Motor ◽  
Induction Motors ◽  
Short Circuit ◽  
Frequency Converter ◽  
Steady State Mode ◽  
Peak Current ◽  
Stable Characteristic ◽  
Additional Charge

 This article discusses the problem of sufficient inductance of AC line reactor at the input of frequency converter. Author provided some simulations for frequency converter loaded by induction motors with different rated powers. For all induction motors the following characteristics of phase current consumed by frequency converter from the grid considered. Instantaneous peak current during the frequency acceleration of induction motor. Amplitude of the current in steady state mode after the end of induction motor acceleration. Instantaneous peak current during additional charge of DC-link capacitance through the shunting contact of charging resistance. Instantaneous peak current when charging DC-link capacitance through the charging resistance - the most stable characteristic, which is practically does not depend on the presence and nominal of the line reactor. It is advisable to demand to inductance of the line reactor, that is, to percent impedance or short-circuit voltage, %, that the considered in computational experiments peak and amplitude values of currents remain not higher than the last above mentioned. It can be stated that with the increase of induction motor rated power, the sufficient value of short-circuit voltage, %, also increases. 

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