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    Wyświetlanie 1-12 z 12
    Tytuł:
    The model of double-cage induction motor for the analysis of thermal fields in transient operations
    Autorzy:
    Mróz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/141544.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    AC motors
    heating
    induction motors
    squirrel cage motors
    temperature rise
    Opis:
    Emergency motor switch-on happens occasionally while operating a doublesquirrel- cage motor at full supply voltage with the rotor blocked (e.g., in coal mills). After releasing the blockage, the by now heated motor is started up again. However, the mechanical stress caused by the increased temperature poses considerable hazards to the squirrel-cage winding. This paper presents a double-cage induction motor model for analysis of thermal fields in transient operation. The thermal field for the rotor of a doublesquirrel- cage motor of soldered or cast structure, operating in the conditions described, has been calculated in the present paper using a thermal network method. Measurement results have been presented for the double-squirrel-cage winding temperature for a soldered cage construction in the blocked rotor state.
    Źródło:
    Archives of Electrical Engineering; 2017, 66, 2; 397-408
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Problems of practical diagnostics of induction machines in industry
    Autorzy:
    Dybowski, P.
    Rams, W.
    Rusek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1203942.pdf
    Data publikacji:
    2008
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Tematy:
    current measurement
    diagnostic expert system
    induction machine
    squirrel-cage motor
    Opis:
    There are many problems in practical diagnostics of high-power, squirrel-cage induction machines, operated in industrial conditions. These problems make the diagnostics a difficult matter. The problems appear already at the stage of gathering diagnostic signals. The only practically accessible signals are the currents on secondary sides of current transformers monitoring supply currents of separate machines. Due to the proximity of other conductors, carrying high currents, these signals are sometimes accompanied by heavy background noise. The next stage of the diagnostic procedure is off-line analysis of registered signals referring to investigated objects. The main problem at this stage is proper interpretation of gotten results, especially in the cases where determination of the cage state, of investigated machines, is difficult due to ambiguity of diagnostic signals. The ambiguities and doubts by taking diagnostic decision result from that the diagnostic-like signal could be generated not only by cage damage but also by slightly asymmetrically manufactured rotor cage. In such difficult cases, the many-year diagnosing experience is the indispensable precondition for proper diagnostic verdict. The present paper includes some reports on case studies encountered during practical diagnoses of high power, 6kV induction machines, operated in real industrial conditions.
    Źródło:
    Electrical Power Quality and Utilisation. Journal; 2008, 14, 1; 79-84
    1896-4672
    Pojawia się w:
    Electrical Power Quality and Utilisation. Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stator winding inter-turn short-circuit modelling of a squirrel-cage induction motor
    Autorzy:
    Radecki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193158.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    squirrel-cage induction motor modelling
    induction motor faults
    stator winding inter turn short-circuit
    Opis:
    A mathematical model of a squirrel-cage induction motor with inter-turn short-circuits in stator phases is presented in this paper. In the proposed mathematical model an extent and angular localization of short-circuit faults are determined using a simple form of short-circuit coefficient matrices. The model does not require any additional motor parameters than those that are required for conventional model of healthy induction motor. Comparative results obtained through computer simulations and from a laboratory test-stand with 2.2 kW induction motor are contained in the article. The results obtained validate the proposed extended mathematical model of a squirrel-cage induction motor with inter-turn short-circuit of stator windings.
    Źródło:
    Power Electronics and Drives; 2016, 1, 36/1; 139-148
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Compared analysis of the transients and the steady states of squirrel-cage motor and LSPMSM
    Autorzy:
    Barański, M.
    Idziak, P.
    Łyskawiński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/97457.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    squirrel-cage motor
    line start permanent magnet synchronous motor
    starting process
    heating
    functional parameters
    Opis:
    In the paper the transients under starting process and the steady states of squirrel-cage motor (IM) and line start permanent magnet synchronous motor (LSPMSM) have been compared. The original stator of 3 kW induction motor type Sg 100L-4B, was used in both structures. In order to determine opportunities to increase energy parameters of LSPMSM the heating curves of both motors were compared. In LSPMSM the rotor with aluminum and copper cage was used. The basic operating parameters of the two structures which are characterized by identical stators were tested. Particular attention has been given to the transient under starting process. Efficiency, power factor and current in the stator windings obtained during measurements for both structures have been presented. The paper focuses on achieving a much higher output power for LSPMSM than an induction motor of the same size. The selected results of experimental tests were shown.
    Źródło:
    Computer Applications in Electrical Engineering; 2014, 12; 265-274
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Unraveling Induction Motor State through Thermal Imaging and Edge Processing : A Step towards Explainable Fault Diagnosis
    Autorzy:
    Piechocki, Mateusz
    Pajchrowski, Tomasz
    Kraft, Marek
    Wolkiewicz, Marcin
    Ewert, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/27312790.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    thermal imaging
    fault diagnosis
    squirrel-cage induction motor
    convolutional neural networks
    explainability
    edge processing
    Opis:
    Equipment condition monitoring is essential to maintain the reliability of the electromechanical systems. Recently topics related to fault diagnosis have attracted significant interest, rapidly evolving this research area. This study presents a non-invasive method for online state classification of a squirrel-cage induction motor. The solution utilizes thermal imaging for non-contact analysis of thermal changes in machinery. Moreover, used convolutional neural networks (CNNs) streamline extracting relevant features from data and malfunction distinction without defining strict rules. A wide range of neural networks was evaluated to explore the possibilities of the proposed approach and their outputs were verified using model interpretability methods. Besides, the top-performing architectures were optimized and deployed on resource-constrained hardware to examine the system's performance in operating conditions. Overall, the completed tests have confirmed that the proposed approach is feasible, provides accurate results, and successfully operates even when deployed on edge devices.
    Źródło:
    Eksploatacja i Niezawodność; 2023, 25, 3; art. no. 170114
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Squirrel cage induction motors with idle bars
    Autorzy:
    Bernatt, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/141386.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    silnik indukcyjny
    klatka wirnika
    pręt bierny
    induction motor
    squirrel cage
    idle bar
    hard working conditions
    Opis:
    The paper describes high output induction motors driving large applications of heavy starting conditions. Heavy start is characterised by long accelerating time and occures in drives of hudge inertia torque, esspecially when performed at full load. The reliable operation of the motors depends on proper design and quality of rotor's cage. The aspects of thermal behaviour and electrodynamic forces have to be considered during the design of the motor for hard working conditions. In the paper the rotor with idle bars is investigated.
    Źródło:
    Archives of Electrical Engineering; 2010, 59, 1-2; 79-86
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Soft starting and braking application for squirrel-cage induction motors operating in intermittent duty
    Autorzy:
    Firago, B.
    Vasilyev, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813599.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    soft starting and braking
    squirrel-cage induction motor
    energy losses
    stator winding temperature
    frequency of starting
    Opis:
    This paper deals with energetic aspects of soft starting and braking application for the squirrelcage induction motors operating in intermittent duty with constant load. Energy losses in transients of an induction motor for different laws of voltage changing as well as induction motor stator winding temperature at the end of starting process are calculated and compared with the ones during fullvoltage starting and plug braking. Energy losses calculation during induction motor soft starting and braking has been performed analytically and via the Matlab simulation models of equivalent twophase induction motor in alfa to beta coordinates. The results of both calculation methods are compared and a divergence between them is determined. Also the effect of total energy losses on the induction motor stator winding temperature at the end of the motor starting process and its allowable frequency of starting is analyzed. Analytical calculation and simulation of soft starting and braking have been performed with allow for the linear and exponential laws of the first voltage harmonic magnitude changing. The results of simulation and analytical calculations are given in the tables.
    Źródło:
    Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały; 2012, 66, 32; 339-349
    1733-0718
    Pojawia się w:
    Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal analysis of Double Stator Switched Reluctance Machine (DSSRM) with and without a squirrel cage rotor
    Autorzy:
    Abbasian, M.
    Jalali, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/140844.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Computational Fluid Dynamics (CFD)
    Finite Element Method (FEM)
    squirrel cage
    double stator
    switched reluctance machine
    thermal analysis
    Opis:
    Double Stator Switched Reluctance Machine (DSSRM) is a novel switched reluctance machine with limited information about its heat distribution and dissipation. This paper presents a two dimensional (2-D) thermal analysis of Double Stator Switched Reluctance Machine (DSSRM) to observe actual heat distribution in the parts of the machine, using Finite Element Method (FEM). Two topologies for the rotor of DSSRM are considered, Non-Squirrel Cage Double Stator Switched Reluctance Machine (NSCDSSRM) and Squirrel Cage Double Stator Switched Reluctance Machine (SC-DSSRM). The heat distribution of these two topologies is analyzed, using Computational Fluid Dynamics (CFD). Finally the results are presented and compared.
    Źródło:
    Archives of Electrical Engineering; 2017, 66, 1; 189-198
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of super-twisting sliding mode controllers in direct field-oriented control system of six-phase induction motor: experimental studies
    Autorzy:
    Listwan, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193593.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    six-phase squirrel-cage induction motor
    direct field-oriented control method
    super-twisting sliding mode control
    experimental studies
    Opis:
    This paper presents the direct field-oriented control (DFOC) method of six-phase induction motor with the application of super-twisting sliding mode algorithm. The mathematical model of the six-phase induction motor has been described. The descriptions of the space vector modulation (SVM) method and the super-twisting algorithm have been presented. The DFOC method with super-twisting sliding mode controllers has been described. The experimental studies of the DFOC method with super-twisting controllers have been performed, and the results of these studies are presented and discussed.
    Źródło:
    Power Electronics and Drives; 2018, 3, 38; 23-34
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of fault states in drive systems with multi-phase induction motors
    Autorzy:
    Listwan, Jacek Jan
    Powiązania:
    https://bibliotekanauki.pl/articles/141008.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Direct Field-Oriented Control method
    Fault Tolerant Control
    MRASCC estimator
    multi-phase squirrel-cage induction moto sensorless drives
    Voltage Source Inverter faults
    Opis:
    The paper presents the analysis of different fault states in drive systems with multiphase induction motors. The mathematical models of a five-phase and six-phase induction motor and the MRASCC estimator have been presented and the description of the Space Vector Modulation has been shown. The Direct Field-Oriented Control (DFOC) system is analyzed. Results of the simulation and experimental studies of the Direct Field-Oriented Control systems in the fault conditions are presented. The author’s original contribution includes analysis and studies of the DFOC control method of a five-phase induction motor resistant to the motor speed sensor fault with the use of the MRASCC estimator.
    Źródło:
    Archives of Electrical Engineering; 2019, 68, 4; 817-830
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computerised system for fault diagnosis of the rotor bars of squirrel-cage induction motor
    Komputerowy system diagnostyczny uszkodzeń prętów klatki maszyny indukcyjnej
    Autorzy:
    Osowski, S.
    Kurek, J.
    Siwek, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/257946.pdf
    Data publikacji:
    2010
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
    Tematy:
    klatkowa maszyna indukcyjna
    wykrywanie uszkodzeń
    pręt
    maszyna wektorów nośnych
    przetwarzanie sygnału
    squirrel-cage induction motor
    bar fault detection
    support vector machine (SVM)
    signal processing
    Opis:
    The paper presents the computerised system for the diagnosis of the rotor bars of an induction electrical motor. The solution relies on the processing of the measured stator current and application of the Support Vector Machine as the classifier. The important point is the generation of the diagnostic features on the basis of which the SVM classifier undertakes its decision whether or not the bars are faulty. The most important problem is concerned with the generation of the diagnostic features, on the basis of which the recognition of the state of the rotor bars is done. In our approach, we use the spectral information of the stator current, limited to a strictly specified region. The selected features form the input vector applied to the single class Support Vector Machine, responsible for recognition of the fault. The results of the numerical experiments are presented and discussed in the paper.
    Praca przedstawia skomputeryzowany automatyczny system diagnostyczny do wykrywania uszkodzeń prętów maszyny indukcyjnej. Rozwiązanie jest typu bezinwazyjnego i może być zastosowane do maszyny w ruchu. Sygnały diagnostyczne generowane są na podstawie zarejestrowanych sygnałów prądu statora. W aplikacji wykorzystano jednoklasową sieć SVM (ang. Support Vector Machine) pracującą jako klasyfikator. Jednym z najistotniejszych problemów rozwiązanych w tym zadaniu jest generacja i selekcja odpowiednich cech diagnostycznych, na podstawie których klasyfikator dokonuje rozpoznania stanu prętów. Zaproponowano cechy bazujące na charakterystyce spektralnej prądu statora, ograniczonej do wybranego zakresu częstotliwości związanego z poślizgiem maszyny. System zbudowany w ramach projektu jest w pełni zautomatyzowany, poczynając od akwizycji sygnałów, poprzez ich przetwarzanie wstępne, aż po końcowy werdykt (pręty uszkodzone bądź nieuszkodzone).
    Źródło:
    Problemy Eksploatacji; 2010, 4; 135-151
    1232-9312
    Pojawia się w:
    Problemy Eksploatacji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of closed loop control on diagnostic indices in different faults of squirrel cage induction motor
    Autorzy:
    Bouabid, Nourelhouda
    Moussa, Mohamed-Amine
    Maouche, Yassine
    Khezzar, Abdelmalek
    Powiązania:
    https://bibliotekanauki.pl/articles/1955204.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    closed loop control
    discrete Fourier transformation
    fault diagnostic
    indirect filed control
    rotor mechanical faults
    squirrel cage induction motor
    sterowanie w pętli zamkniętej
    dyskretna transformacja Fouriera
    diagnostyka błędów
    sterowanie pośrednie złożone
    usterki mechaniczne wirnika
    silnik indukcyjny klatkowy
    Opis:
    The aim of this work is to study the influence of closed loop control on diagnostic indices of both broken bar and mixed air-gap eccentricity fault indices of the squirrel cage induction motor drive. The present work is focused on the direct stator current isd signal analysis, which is independent of torque load when the induction motor is controlled by an indirect control field. The fault signatures are on the line extracted from the direct stator current signal using the discrete Fourier transformation (DFT). The formula of the measured direct stator current at both conditions is determined by the transfer function of the current loop. The obtained results show that the current loop corresponds to a low pass filter and can reduce the magnitude of diagnostic indicators which lead to wrong evaluation of the fault. Simulation and experiments were carried out in order to confirm the theoretical analysis.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 4; 943-958
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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