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    Wyświetlanie 1-11 z 11
    Tytuł:
    Speed control of multiphase cage induction motors incorporating supply sequence
    Autorzy:
    Drozdowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/141418.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multiphase cage induction motor
    supply sequence
    speed control
    multiphase voltage source inverter
    field oriented control
    Opis:
    The subject of this paper is the control possibility of the multiphase cage induction motors having number of phases greater than 3. These motors have additional properties for speed control that distinguish them from the standard 3 phase motors: operation at various sequences of supplying voltages due to the inverter control and possible operation with few open-circuited phases. For each supply sequence different no load speeds at the same frequency can be obtained. This feature extends the motor application for miscellaneous drive demands including vector or scalar control. This depends mainly on the type of the stator winding for a given number of phases, since the principle of motor operation is based on co-operation of higher harmonics of magnetic field. Examples of operation are presented for a 9-phase motor, though general approach has been discussed. This motor was fed by a voltage source inverter at field oriented control with forced currents. The mathematical model of the motor was reduced to the form incorporating all most important physical features and appropriate for the control law formulation. The operation was illustrated for various supply sequences for “healthy” motor and for the motor operating at one phase broken. The obtained results have shown that parasitic influence of harmonic fields interaction has negligible influence on motor operation with respect to the useful coupling for properly designed stator winding.
    Źródło:
    Archives of Electrical Engineering; 2014, 63, 4; 511-534
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of BLDCM with a double 3-phase stator winding and back EMF harmonics
    Autorzy:
    Drozdowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/950656.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    brushless DC motor
    double stator winding
    harmonics of back EMF
    Opis:
    In this paper the mathematical model of the brushless DC motor (BLDCM) with a double 3-phase stator winding is analysed. Both the 3-phase windings are mutually displaced by 30 electrical degree. Special care has been sacrificed to influence of higher harmonics of induced electromotive forces (EMF) on electromagnetic torque and zero sequence voltages that may be used for sensorless control. The mathematical model has been presented in natural variables and, after transformation to symmetrical components, in a vector form. This allows, from one side, for formulating the equivalent circuit suitable for circuit oriented simulators (e.g.: Spice, SimPowerSystems of Simulink) and, from the other point of view, for analysis of higher harmonics influence on control possibilities. These considerations have been illustrated with some results of four quadrant operation obtainded due to simulation at automatic control.
    Źródło:
    Archives of Electrical Engineering; 2015, 64, 1; 53-66
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multiphase cage induction motors for controlled drives
    Autorzy:
    Drozdowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1372468.pdf
    Data publikacji:
    2011
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
    Tematy:
    silnik klatkowy
    silnik indukcyjny
    napęd sterowany
    cage motor
    induction motor
    control drive
    Opis:
    General control possibilities of the drive with a multiphase cage induction motors having number of phases greater than 3 are subject of the paper. The motors have additional properties for speed control distinguishing them from the standard 3 phase motors. They are connected with operation at various sequences of supplying voltages due to the inverter control and possible operation with open-circuited phases. This allows for different no load speeds at the same frequency. Applying vector or scalar control this feature extends applications for miscellaneous drive demands including sensor-less control. The main features of the motors depend mainly on type of the stator winding for a given number of phases. Example of operation was presented for a 9-phase motor, though general approach was discussed. The motor was supplied from a voltage source inverter and controlled with field orientation under forced currents. The mathematical model of the motor was reduced to the minimum form incorporating all most important physical features and appropriate for the control law formulation.
    Źródło:
    Maszyny Elektryczne: zeszyty problemowe; 2011, 5, 93; 7-12
    0239-3646
    2084-5618
    Pojawia się w:
    Maszyny Elektryczne: zeszyty problemowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The universal mathematical model for multiphase cage induction motors
    Autorzy:
    Drozdowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1367620.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
    Tematy:
    electrical machines
    multiphase cage induction motor
    mathematical model
    Opis:
    The universal mathematical model of cage induction motor must assure all possible kinds of motor operation. There are two the most important: operation at different sequences of supplying voltages or currents causing different no load speeds and operation with open-circuited phases caused by supplying converter or the machine damage. The first feature is bound with a real stator winding producing a spectrum of magneto motive force (MMF) and the second with modelling of current flow breaks. Such a model can be also used for modelling the ideal multiphase motor with sinusoidally distributed windings. This is the subject of this paper. The mathematical model has been developed from the description in symmetrical components. That allowed for designation of model parameters and space vectors defining. This model can be presented as the equivalent circuit for transient states and this circuit can be used for circuit oriented simulators (Spice, Simulink/SimPowerSystems, Saber, TINA etc.). As a consequence the mathematical model can be a background for training of different control strategies and determination of mechanical characteristics. The use of model has been illustrated by an example.
    Źródło:
    Maszyny Elektryczne: zeszyty problemowe; 2015, 3, 107; 19-24
    0239-3646
    2084-5618
    Pojawia się w:
    Maszyny Elektryczne: zeszyty problemowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy efficient two stage starting of cage induction motors
    Dwuetapowy rozruch energooszczędny silników indukcyjnych klatkowych
    Autorzy:
    Drozdowski, P.
    Szular, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2076298.pdf
    Data publikacji:
    2005
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
    Tematy:
    silniki indukcyjne
    silniki klatkowe
    energooszczędność
    rozruch silnika elektrycznego
    Opis:
    "Dwuetapowy rozruch energooszczędny silników indukcyjnych klatkowych". W artykule zaproponowano rozruch silników indukcyjnych klatkowych kształtowany dwuetapowo: początkowo poprzez regulację częstotliwości i napięcia według odpowiedniego prawa sterowania zapewniającego żądaną dynamikę a następnie poprzez regulację jedynie napięcia (od częstotliwości większej od ok. 20 Hz). Rozruch częstotliwościowy zapewnia zwiększenie strumienia skojarzonego wirnika a przez to zmniejszenie prądów fazowych i w efekcie zaoszczędzenie pobieranej przez silnik energii. Ponadto dynamika napędu w tym zakresie może być łatwo sterowana w zależności od celu i algorytmu sterowania. W drugim etapie rozruch jest ksztatłowany przy stałej częstotliwości i regulowanym napięciu. Jako urządzenie energoelektroniczne służące temu celowi zastosowano cyklokonvertor gwiazdowy pracujący w drugim etapie rozruchu jako trójfazowy sterownik mocy. Zaproponowaną metodę rozruchu uzasadniono teoretycznie oraz zilustrowano odpowiednimi przebiegami.
    Źródło:
    Maszyny Elektryczne: zeszyty problemowe; 2005, 73; 119-123
    0239-3646
    2084-5618
    Pojawia się w:
    Maszyny Elektryczne: zeszyty problemowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fault Detection of Induction Motors Due to the Effects of Magnetic Saturation
    Autorzy:
    Drozdowski, P
    Duda, A
    Powiązania:
    https://bibliotekanauki.pl/articles/1368121.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
    Tematy:
    fault detection
    induction motors
    magnetic saturation
    Opis:
    In this paper, the impact damage to the motors on the course of zero-sequence voltage and its spectrum is presented. Detection signals results from detail analysis of the formula describing this voltage component is induced in the stator windings due to core magnetic saturation and the discrete displacement of windings. Its course is affected by operating both the stator and the rotor. Other fault detection methods, by analysing the spectrum of stator currents, are known and widely applied. The presented method is under investigation, but may be a complement to the other because of easy measurement of the zero voltage for star connected motors. The results of the method are presented by measurements and explained using mathematical modelling for the slip-ring induction motor.
    Źródło:
    Maszyny Elektryczne: zeszyty problemowe; 2013, 3, 100/1; 33-38
    0239-3646
    2084-5618
    Pojawia się w:
    Maszyny Elektryczne: zeszyty problemowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of magnetic saturation effects on the fault detection of induction motors
    Autorzy:
    Drozdowski, P.
    Duda, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/141384.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    induction motors
    fault detection
    saturation
    zero-sequence voltage
    Opis:
    In this paper, the influence of impact damage to the induction motors on the zero-sequence voltage and its spectrum is presented. The signals detecting the damages result from a detailed analysis of the formula describing this voltage component which is induced in the stator windings due to core magnetic saturation and the discrete displacement of windings. Its course is affected by the operation of both the stator and the rotor. Other fault detection methods, are known and widely applied by analysing the spectrum of stator currents. The presented method may be a complement to other methods because of the ease of measurements of the zero voltage for star connected motors. Additionally, for converter fed motors the zero sequence voltage eliminates higher time harmonics displaced by 120 degrees. The results of the method application are presented through measurements and explained by the use of a mathematical model of the slip-ring induction motor.
    Źródło:
    Archives of Electrical Engineering; 2014, 63, 3; 489-506
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Matlab-simulink modelling of induction machine incorporating magnetic saturation
    Autorzy:
    Drozdowski, P.
    Duda, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811892.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    induction machine
    saturation
    mathematical model
    MATLAB Simulink
    SimPower Systems Modelling
    Opis:
    In this paper the computer model of the cage induction machine incorporating magnetic nonlinearity was presented. The model contains the mathematical model of the induction machine recorded as an S-function and the connecting blocs attaching the model from one side to the three phase terminals of the supply system model and from the other to the system of mechanical model. Hence, SimPowerSystems and SimMechanics libraries can be used. Such a methodology allows for various drives modelling were the induction machine operates as a motor or a generator and cooperates with power electronics. Using wide range of Simulink possibilities various control techniques can be applied. Using this methodology the own mathematical models of other electrical machines together with the Simulink library models can be used.
    Źródło:
    Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały; 2012, 66, 32; 38-44
    1733-0718
    Pojawia się w:
    Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Elastooptic Constants of SrLaAlO$\text{}_{4}$ and SrLaGaO$\text{}_{4}$ Single Crystals Determined by Brillouin Scattering
    Autorzy:
    Drozdowski, M.
    Pajączkowska, A.
    Kasprowicz, D.
    Ziobrowski, P.
    Gloubokov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964361.pdf
    Data publikacji:
    1997-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.20.Fb
    78.35.+c
    63.20.-e
    Opis:
    In this paper we report the elastooptic constants p$\text{}_{ij}$ of strontium lanthanum aluminate, SrLaAlO$\text{}_{4}$ and strontium lanthanum gallate SrLaGaO$\text{}_{4}$ single crystals, which were determined at room temperature using Brillouin scattering method. In order to investigate the elastooptic constants of SrLaAlO$\text{}_{4}$ and SrLaGaO$\text{}_{4}$ single crystals, a substitution method proposed by Cummins and Schoen, and developed by Nelson and Lax was used. The obtained results are also discussed in terms of the nature defects which might arise in these crystals during growth process.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 1; 177-181
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of different methods of site preparation on natural regeneration of Pinus sylvestris in Eastern Poland
    Autorzy:
    Aleksandrowicz-Trzcinska, M.
    Drozdowski, S.
    Brzeziecki, B.
    Rutkowska, P.
    Jablonska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/41158.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    natural regeneration
    Pinus sylvestris
    Scotch pine
    seedling density
    seedling growth
    seedling quality
    soil scarification
    Polska
    Opis:
    Mechanical site preparation (MSP) is commonly used to enable forest regeneration of clear-cuts. Less intense methods may be more suitable from an environmental point of view, but such a method can result in the lack of natural regeneration. We compare the influence of three MSP methods on natural regeneration of Scots pine. The methods differ in their degree of soil disturbance. The effects of MSP by forest plough (FP), active plough (AP), and forest cutter (FC) on density, quality, and biometric parameters of one-year old seedlings were determined. The highest density of seedlings was obtained in the FP treatment (188,000 seedlings ha–1). The seedling density was significantly lower in the AP method (121,000 seedlings ha–1), and in the FC variant (36,000 seedlings ha–1). The best quality seedlings were found in the FC variant, and the worst – in the FP treatment. Most biometric parameters of seedlings did not differ by MSP method, except for the root length and root:shoot ratio. By the end of growing season, in the FP treatment, 1-year old seedlings formed a top bud more than twice as often as the seedlings from the AP and FC treatments. The FP method led to the best Scots pine natural regeneration. The results obtained in the FC variant were not as good as in the FP method, though they were still acceptable from the silvicultural point of view. The FC method was the least intensive method of site preparation, yet it is considered the most appropriate from the environmental (soil protection) point of view.
    Źródło:
    Dendrobiology; 2014, 71
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectroscopy and Thermoluminescence of LuAlO$\text{}_{3}$:Ce
    Autorzy:
    Wiśniewski, D.
    Drozdowski, W.
    Wojtowicz, A.
    Lempicki, A.
    Dorenbos, P.
    de Haas, J. T. M.
    van Eijk, C. W. E.
    Bos, A. J. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945649.pdf
    Data publikacji:
    1996-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.90.+t
    78.55.-m
    61.80.Ed
    29.40.-n
    Opis:
    The present status of the LuAlO$\text{}_{3}$:Ce scintillator is reviewed. Scintillation mechanism of this material is based on capture by Ce$\text{}^{3+}$ of holes and then electrons from their respective bands. Results of spectroscopic and thermoluminescence experiments are presented to support this model.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 2; 377-384
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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