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    Tytuł:
    Asynchronous slip-ring motor synchronized with permanent magnets
    Autorzy:
    Glinka, T.
    Bernatt, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/140518.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    motor with permanent magnets
    slip-ring rotor winding
    asynchronous start
    Opis:
    The electric LSPMSM motor presented in the paper differs from standard induction motor by rotor design. The insulated start-up winding is located in slots along the rotor circumference. The winding ends are connected to the slip-rings. The rotor core contains permanent magnets. The electromechanical characteristics for synchronous operation were calculated, as were the start-up characteristics for operation with a shortcircuited rotor winding. Two model motors were used for the calculations, the V-shaped Permanent Magnet (VPM) – Fig. 3, and the Linear Permanent Magnet (IPM) – Fig. 4, both rated at 14.5 kW. The advantages of the investigated motor are demonstrated in the conclusions.
    Źródło:
    Archives of Electrical Engineering; 2017, 66, 1; 199-206
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of numerically determined noise of a 290 kW induction motor using FEM and measured acoustic radiation
    Autorzy:
    Nahlaoui, M. Al
    Steins, H.
    Kulig, S.
    Exnowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/140646.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    inverter-fed
    induction motor
    asynchronous machine
    acoustic radiation
    modal analysis
    Opis:
    In this paper a comparison of numerically determined and measured electromagnetically exited noise of an induction motor is presented. The calculations are accomplished using FEM for an example motor, which is a 290 kW inverter-fed asynchronous machine. The approach starts with the electromagnetic and mechanical consideration. The focus is set on acoustic considerations, which contain the 3D-FE-model and measurement setup in the sound chamber.
    Źródło:
    Archives of Electrical Engineering; 2013, 62, 2; 195-207
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Direct predictive control of asynchronous machine torque using matrix converter
    Autorzy:
    Talavat, V.
    Galvani, S.
    Hajibeigy, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/140834.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    asynchronous motor
    direct predictive control of torque
    direct matrix converter
    Opis:
    The matrix converter is a new generation of power electronic converters and is an alternative to back-to-back converters in applications that dimensions and weight are important. In this paper, a simple control algorithm for a three-phase asynchronous motor based on a direct torque control technique, which is fed through a three-phase direct matrix converter, is presented. For direct matrix converters, 27 switching modes are possible, which using the predictive control technique and for the different modes of the matrix converter, the motor behavior is estimated at the next sampling interval. Then the objective function is determined and the optimal possible mode is selected. Finally, the best switching mode is applied to the direct matrix converter. In order to evaluate the proposed method, simulation of the system in Matlab/Simulink software environment is performed. The results show the effectiveness of the proposed method.
    Źródło:
    Archives of Electrical Engineering; 2018, 67, 4; 773-788
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bayesian graphical model based optimal decision-making for fault diagnosis of critical induction motors in industrial applications
    Autorzy:
    Lakehal, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/200978.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    maintenance plan
    predictive actions
    prioritization
    critical asynchronous motor
    Bayesian approach
    Opis:
    In an effort to achieve an optimal availability time of induction motors via fault probabilities reduction and improved prediction or diagnostic tools responsiveness, a conditional probabilistic approach was used. So, a Bayesian network (BN) has been developed in this paper. The objective will be to prioritize predictive and corrective maintenance actions based on the definition of the most probable fault elements and to see how they serve as a foundation for the decision framework. We have explored the causes of faults for an induction motor. The influence of different power ranges and the criticality of the electric induction motor are also discussed. With regard to the problem of induction motor faults monitoring and diagnostics, each technique developed in the literature concerns one or two faults. The model developed, through its unique structure, is valid for all faults and all situations. Application of the proposed approach to some machines shows promising results on the practical side. The model developed uses factual information (causes and effects) that is easy to identify, since it is best known to the operator. After that comes an investigation into the causal links and the definition of the a priori probabilities. The presented application of Bayesian networks is the first of its kind to predict faults of induction motors. Following the results of the inference obtained, prioritizations of the actions can be carried out.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 3; 467-476
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficiency improvement due to direct torque and flux three levels three areas control method applied to small hydroelectric power plant
    Autorzy:
    Kulikowski, K.
    Sikorski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/200033.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    asynchronous machine
    AC/DC/AC converter
    DC/AC converter
    DTC
    flux control
    Opis:
    The paper presents a description of a new DTFC3L3A (direct torque and flux control three levels three areas) control method of induction machine as well as its comparison with the DTC method. The basis for the comparison is the switching frequency of described methods. The proposed method is optimized to reduce number of switchings (which is proportional to switching power losses) in static state, as well as it takes into account the angle which makes it possible to obtain a sinusoidal shape of flux within range of low angular frequencies of an asynchronous machine. The paper includes the results of experiments performed on a three level DC/AC inverter for both control methods.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 4; 569-574
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of current harmonics in 3kV DC catenary caused by specific current harmonics of an asynchronous motor
    Analiza harmonicznych prądu w sieci trakcyjnej 3kV DC spowodowanych szczególnymi harmonicznymi prądu silnika asynchronicznego
    Autorzy:
    Lewandowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/224241.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    trakcja elektryczna
    silnik asynchroniczny
    harmoniczne prądu
    electric traction system
    asynchronous motor
    current harmonics
    Opis:
    The mathematical model of vehicle supply system as welI as the mathematical model of main circuit of locomotive with asynchronous motors have been described in this article. The necessity of analysis of disturbances caused by distorted current run of drive motors emerged together with the introduction of high power vehicles with power eIectronic converters. Analysis of the compatibility of traction high current circuits with circuits of the signal and traffic controI systems requires the knowledge of current spectrum in a catenary, which has been taken by a vehicle. The author has described the algebraic method of calculating of the spectrum amplitudes in a catenary. It does not require laborious and time-consuming simulations of a system, which considerably decreases preliminary costs of designation and dimensioning of a vehicle drive system.
    W artykule opisano model matematyczny systemu zasilania pojazdu oraz obwodu głównego lokomotywy z silnikami asynchronicznymi. Wraz z wprowadzeniem pojazdów przekształtnikowych dużej mocy zaistniała konieczność analizy oddziaływań zakłócających wywołanych odkształconym przebiegiem prądów silników napędowych. Analiza kompatybilności obwodów silnoprądowych trakcji z obwodami widma prądu w sieci trakcyjnej wywołanego przez pojazd. Autor opisał metodę algebraiczną obliczania amplitud widma w sieci trakcyjnej. Nie wymaga ona żmudnyvh i czasochłonnych symulacji systemu co w znacznej mierze zmniejsza wstępne koszty projektowania i wymiarowania systemu napędowego pojazdu.
    Źródło:
    Archives of Transport; 2010, 22, 3; 289-301
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modern Direct Torque and Flux Control methods of an induction machine supplied by three-level inverter
    Autorzy:
    Sikorski, A.
    Kulikowski, K.
    Korzeniewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/201199.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    asynchronous machine
    DC/AC inverter
    DTC
    flux and torque control
    3-level DC/AC inverter
    Opis:
    This paper describes two modern direct torque and flux control methods of an induction machine supplied by a three-level inverter. Additionally, it presents a comparison of the methods both in static and dynamic states. The methods, in a specific way, make use of an increased number of active vectors of the three-level inverter in order to improve control quality and reduce switching frequency. The two methods modify the DTC method by using its advantages and eliminating, at the same time its drawbacks. In static states the comparison was based on the results of investigations performed for two different load values and three set values of angular speed, whereas in dynamic states the comparison was focused on the behavior of the machine at startup. The results of the investigations have shown that both methods give very good performance. They are characterized by both sinusoidal shape of flux and low current deformations even at low angular speeds i.e. less than 10% of the nominal value. The presented methods also allow to generate nominal flux for set zero angular speed in order to achieve excitation of the induction machine. The switching frequencies for both methods are very similar in almost the whole range of control but the methods have shown some differences in control quality, particularly for higher torque values.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 4; 771-778
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Squirrel-cage motor drive dynamics modeling including chosen damages - programming tools
    Autorzy:
    Sołbut, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/141398.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    modelowanie numeryczne
    silnik asynchroniczny
    diagnostyka
    programowanie obiektowe
    numerical modelling
    asynchronous motors
    diagnostics
    object oriented programming tools
    Opis:
    Description of program tools simplifying simulation applications building for physical phenomenons described by differential equations in state equations form modeling is presented in the paper. A method for using prepared libraries for squirrel-cage motors including any motor damages modeling had been described. For that purpose, squirrel-cage motor mathematical model in natural coordinates system had been presented. Presented solutions provide also supply sources (inverters) modeling, including their microprocessor implementation and other phenomenons, that assume state equation structure step changes, depending on variable limitations and time value.
    Źródło:
    Archives of Electrical Engineering; 2010, 59, 3-4; 113-120
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Asynchronous Demodulation Method for Four SSB arranged on Frequency Axis in Mobile Radio Path using Hilbert Transform
    Autorzy:
    Daikoku, Kazuhiro
    Powiązania:
    https://bibliotekanauki.pl/articles/1844503.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    asynchronous demodulation
    4-SSB
    ISB
    mobile radio path
    Hilbert transform
    HF/VHF band telecommunications
    tactical communications
    underwater communications
    Opis:
    In this paper, an asynchronous demodulation method for a four-single sideband (SSB) signal arranged on the frequency axis is developed to support burst mode transmission in a mobile radio path and to achieve greater data throughputs. When a reduced pilot carrier is placed at the center of the 4-SSB signal, it is guarded by lower and upper sidebands, that is, this scheme is classified into a tone-in-band (TIB) system. Digital signal processing (DSP) processors are useful for implementing a Hilbert transform. However, we have for a long time neglected introducing it into the demodulation process of SSB signals.
    Źródło:
    International Journal of Electronics and Telecommunications; 2021, 67, 3; 445-450
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Performance Study on Synchronous and Asynchronous Update Rules for A Plug-In Direct Particle Swarm Repetitive Controller
    Autorzy:
    Ufnalski, B.
    Grzesiak, L. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/141272.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    repetitive process control
    particle swarm optimization (PSO)
    synchronous and asynchronous update rules
    dynamic optimization problem
    repetitive disturbance rejection
    optimal control
    Opis:
    In this paper two different update schemes for the recently developed plug-in direct particle swarm repetitive controller (PDPSRC) are investigated and compared. The proposed approach employs the particle swarm optimizer (PSO) to solve in on-line mode a dynamic optimization problem (DOP) related to the control task in the constant-amplitude constant-frequency voltage-source inverter (CACF VSI) with an LC output filter. The effectiveness of synchronous and asynchronous update rules, both commonly used in static optimization problems (SOPs), is assessed and compared in the case of PDPSRC. The performance of the controller, when synthesized using each of the update schemes, is studied numerically.
    Źródło:
    Archives of Electrical Engineering; 2014, 63, 4; 635-646
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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