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    Wyświetlanie 1-10 z 10
    Tytuł:
    Optymalna praca silników indukcyjnych przy zmianach napiecia źródła zasilania
    Optimal operation of induction motors at varied voltage of the feeding source
    Autorzy:
    Zielińska, M.J.
    Zieliński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1375049.pdf
    Data publikacji:
    2005
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
    Tematy:
    algorytmy
    regulacja napięcia
    silniki indukcyjne
    energooszczędność
    Opis:
    Most of induction motors operate at a load that is considerably lower than the rated load. It brings about a change in such energy indicators as power factor and efficiency that decide over electrical energy consumption. Economic efficiency of a drive system operation depends on those indicators and therefore optimum conditions for the motor operation should be created. If the motor load is lower than the rated load, voltage should be reduced or frequency should be changed to such a value that can ensure maximum values of the energy indicators. Possibilities of energy-saving operation of an induction motor with the regulation of voltage and feeding voltage frequency have been considered. Rules for the enhancement of such energy indicators as current input to the motor, power factor, and efficiency have been given. It is advantageous to feed a motor with voltage and feeding-voltage frequency that vary depending on the load degree as then energy consumption gets reduced. At the rated load a motor has to be fed with rated voltage and rated frequency but with decreasing load the voltage should be adequately reduced and the frequency adequately adjusted. Minimal feeding-voltage values are required at the open-circuit operation. Additionally, algorithms of voltage regulation that can ensure maintaining energy indicators at an adequate preset level have been presented. The indicators have been enhanced and electrical energy savings for various algorithms of voltage and frequency adjustment have been calculated.
    Źródło:
    Maszyny Elektryczne: zeszyty problemowe; 2005, 72; 225-228
    0239-3646
    2084-5618
    Pojawia się w:
    Maszyny Elektryczne: zeszyty problemowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ strumienia zbocznikowanego na parametry schematu zastępczego dla silników klatkowych o dużych prędkościach obrotowych
    The effect of a shunted flux on the parameters of an equivalent scheme for squirrel-cage high-speed motors
    Autorzy:
    Zielińska, M.J.
    Zieliński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1369599.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
    Tematy:
    silniki klatkowe
    duże prędkości obrotowe
    cage motors
    high-speed motors
    Opis:
    Influence of the permanent magnet assembly on the single-phase permanent magnet synchronous motor on the running motor properties was investigated. Field-circuit synchronous motor models were applied in Maxwell ver. 14. EMF, THD and cogging torque were investigated. The optimum permanent magnet assembly motor solution with the best auxiliary winding parameters was presented.
    Źródło:
    Maszyny Elektryczne: zeszyty problemowe; 2012, 2, 95; 143-146
    0239-3646
    2084-5618
    Pojawia się w:
    Maszyny Elektryczne: zeszyty problemowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wykorzystanie metody pośredniej do określania momentu krytycznego silnika indukcyjnego
    Indirect method applied to determine pull-out torque for induction motors
    Autorzy:
    Zieliński, W.G.
    Zielińska, M.J.
    Zieliński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1374050.pdf
    Data publikacji:
    2008
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
    Tematy:
    silnik indukcyjny
    moment krytyczny silnika
    Opis:
    Pull-out torque and the corresponding pull-out slip of induction motors is determined, with a fair degree of accuracy, by measurements in the short-circuit and idle-running states. This refers to motors without the skin effect in the cage bar or those in which the phenomenon has been omitted. The paper compares analytical methods for determining pull-out torque based on the method of equivalent graphs and a simplified Kloss formula. The analysis was carried out for two induction motors: squirrel cage and slip ring. Pull-out slip and torque diagrams were used. An advantage of this method is the fact that determination of pull-out torque does not require the knowledge of pull-out slip.
    Źródło:
    Maszyny Elektryczne: zeszyty problemowe; 2008, 80; 151-154
    0239-3646
    2084-5618
    Pojawia się w:
    Maszyny Elektryczne: zeszyty problemowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ nasycenia obwodu magnetycznego i wypierania prądu na przebiegi momentu elektromagnetycznego i prądu podczas rozruchu wysokoobrotowych silników klatkowych
    Influence of the saturation of the magnetic circuit and skin effect on the transients of electromagnetic torque and current during the start up of high-speed motors
    Autorzy:
    Zielińska, M.J.
    Zieliński, W.G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1372567.pdf
    Data publikacji:
    2011
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
    Tematy:
    silnik elektryczny
    silnik klatkowy
    silnik wysokoobrotowy
    rozruch silnika
    obwód magnetyczny
    moment elektromagnetyczny
    Opis:
    High speed squirrel-cage motors are a relatively unknown group of machines, mainly due to their particular application. High rotational speed is achieved by supplying the motors with 400-1500Hz frequency voltage. Their operation in special conditions results in the fact that their structure and some properties differ from those of squirrel-cage induction machines supplied with 50Hz frequency voltage. The use of closed rotor slots causes strong saturation of the magnetic circuit for the slot leakage flux. Changes in the current in the slot causes a varying state of saturation and thus rotor leakage inductance is not a constant parameter. When determining the rotor winding leakage inductance for classic induction motors supplied with 50Hz frequency voltage, the influence of the saturation of the magnetic circuit for the leakage flux is usually omitted. This is a standard approach and an equivalent scheme, mentioned in literature, is used in such a case. Identification of the inductance in motors supplied with high frequency voltage, in which the phenomenon of core saturation occurs, is a relatively complex issue due to the complicated distribution of magnetic flux, and especially the leakage flux. The value of leakage inductance was determined experimentally. The paper presents differential equations describing a mathematical model and transients of the current and electromagnetic torque, obtained by simulating the start-up of a squirrel-cage high-speed motor.
    Źródło:
    Maszyny Elektryczne: zeszyty problemowe; 2011, 3, 91; 183-186
    0239-3646
    2084-5618
    Pojawia się w:
    Maszyny Elektryczne: zeszyty problemowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Opracowanie algorytmów regulacji napięcia zasilania wysokoobrotowych silników klatkowych celem zapewnienia zadanego momentu krytycznego lub rozruchowego
    Developing algorithms for regulating the supply voltage of squirrel-cage high-speed motors in order to obtain the given breakdown or starting torque
    Autorzy:
    Zielińska, M.J.
    Zieliński, W.G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1373228.pdf
    Data publikacji:
    2010
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
    Tematy:
    maszyna elektryczna
    silnik indukcyjny klatkowy
    silnik wysokoobrotowy
    moment krytyczny silnika
    moment rozruchowy
    napięcie zasilania
    Opis:
    Obtaining a high value of the breakdown or starting torque in an asynchronous motor is a very important issue from the point of view of improving its operational properties. These values can be determined based on data of a typical equivalent scheme. This refers to motors without the skin effect in the cage bar or those in which the phenomenon has been omitted. In a high-speed motor, the phenomena of core saturation and skin effect influence the parameters of the equivalent scheme, which are not constant values and depend on the frequency of supply voltage and the value of the current in the bar of the rotor's cage. In consequence, an equivalent scheme valid for classic motors should not be used for analysis of the performance of a high-speed motor. Based on an equivalent scheme which takes into account the influence of frequency on its parameters, the article describes how supply voltage was selected in order to guarantee the preservation of the given breakdown or starting torque. The calculations were made for three motors representing low, medium and high power machines.
    Źródło:
    Maszyny Elektryczne: zeszyty problemowe; 2010, 86; 247-250
    0239-3646
    2084-5618
    Pojawia się w:
    Maszyny Elektryczne: zeszyty problemowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Poślizgowa charakterystyka admitancji stojana silnika indukcyjnego uzyskana przy zastosowaniu symulacji komputerowej
    Slip characteristic of induction motor admittance stator obtained with the application of computer simulation
    Autorzy:
    Zielińska, M.J.
    Zieliński, W.G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2076364.pdf
    Data publikacji:
    2006
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
    Tematy:
    silnik indukcyjny
    stojan
    symulacja komputerowa
    Opis:
    Slip characteristic of induction motor admittance is the admittance locus at varied slip and constant frequency of feeding voltage. Circle diagram can graphically represent the characteristic only in the case when electromagnetic parameters of a machine are constant. Circle diagram makes an important tool at the evaluation of an asynchronous motor operation. Based on the diagram it is possible to find for an arbitrary slip not only values of electrical parameters but also mechanical parameters such as torque, mechanical power and rotational speed. The paper presents a comparative analysis of classical methods for circle diagram elaboration and of their accuracy. Computer simulation of an admittance slip characteristic has been performed with the Matlab-Simulink software, based on dependences that determine admittance of a motor. The analysis concerns conditions when equivalent network parameters of an asynchronous motor are constant and the characteristic is represented by a circle. When electromagnetic parameters of a motor are not constant then the characteristic essentially differs from a typical circle diagram. It mainly concerns a squirrel-cage motor with closed slots in the rotor, fed with high-frequency voltage. In the mentioned case saturation of the closure occurs under the influence of a leakage flux. It has been shown that a shape of the characteristic depends on many parameters of a motor as well as on the way the leakage reactance changes.
    Źródło:
    Maszyny Elektryczne: zeszyty problemowe; 2006, 75; 47-51
    0239-3646
    2084-5618
    Pojawia się w:
    Maszyny Elektryczne: zeszyty problemowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena oszczędności energii elektrycznej przy skokowej regulacji napięcia w silniku asynchronicznym klatkowym
    Evaluation of electrical energy savings at step regulation of voltage in an asynchronous squirrel-cage motor
    Autorzy:
    Zielińska, M.J.
    Zieliński, W.G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2077253.pdf
    Data publikacji:
    2007
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
    Tematy:
    silnik asynchroniczny klatkowy
    silnik klatkowy
    regulacja napięcia
    energooszczędność
    Opis:
    In order to enhance energy indices and obtain electrical energy savings for an asynchronous squirrel-cage motor operating on a long-time basis at a load lower than the rated load it needs to reduce its supply voltage. Efficient operation obtained that way can apply to a single motor or a set of motors driving the same machines. Motor load can vary within a wide range depending on the operation kind. Particularly disadvantageous is operation at little load or at idling, when energy indices of the motor are very low. In such a case it is necessary to apply voltage that can be varied depending on the load factor. When voltage is changed simultaneously with a load change the motor runs at higher values of the indices that decide over electrical energy consumption. At the rated load a motor should be supplied with rated voltage and when the load gets reduced the supply voltage should also be adequately decreased. The lowest voltage is required at the idle run. Relative value of the voltage is then of ca 0.3. Voltage reduction brings about a decrease of voltage-dependent energy losses and an increase of efficiency and the power factor, which leads to the power input reduction and consequently to electrical energy savings. The paper presents motor operation conditions that should be met at a sudden voltage change and rules for enhancing energy indices on the basis of algorithms that maintain such parameters as: minimal current, maximal power factor and maximum efficiency at a preset level. Additionally, runs of the basic motor quantities such as: current input, power factor, efficiency, and slip at step-regulated supply voltage have been determined
    Źródło:
    Maszyny Elektryczne: zeszyty problemowe; 2007, 77; 121-124
    0239-3646
    2084-5618
    Pojawia się w:
    Maszyny Elektryczne: zeszyty problemowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Przebiegi nieustalone prądu i momentu elektromagnetyczneco podczas rozruchu w silnikach indukcyjnych wysokoobrotowych
    Transients of current and electromagnetic torque during start-up in high-speed induction motors
    Autorzy:
    Zielińska, M.J.
    Zieliński, W.G.
    Zieliński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1373753.pdf
    Data publikacji:
    2009
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
    Tematy:
    silnik indukcyjny
    silnik wysokoobrotowy
    rozruch
    Opis:
    High-speed motors are produced in Poland outside the machine-building industry. Only a few motors, adapted to specific purposes, are manufactured, for example, by plants that produce rolling-element bearings. These motors have found their application in driving high-speed grinders in bearing ring raceway production lines. The properties of motors fed with high-frequency voltage result mainly from the use of a closed slot in the rotor and the high frequency of supply voltage. The use of the closed rotor slot causes strong saturation of the magnetic circuit by the leakage flux around the slot. Taking account of the phenomenon of saturation of the magnetic circuit due to the leakage flux around the closed rotor slots is a complex issue. In the present article, this phenomenon was taken into consideration by introducing into the mathematical model of the motor, derived for a linear magnetic circuit, rotor leakage inductance dependent on rotor current. The relation was determined experimentally.
    Źródło:
    Maszyny Elektryczne: zeszyty problemowe; 2009, 82; 249-252
    0239-3646
    2084-5618
    Pojawia się w:
    Maszyny Elektryczne: zeszyty problemowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metoda wyznaczania poślizgowych charakterystyk admitancji wysokoobrotowego silnika klatkowego
    A method of determining the slipping characteristics of admittance of a squirrel-cage high-speed motor
    Autorzy:
    Zielińska, M.J.
    Zieliński, W.G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1373219.pdf
    Data publikacji:
    2010
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
    Tematy:
    maszyna elektryczna
    silnik indukcyjny klatkowy
    silnik wysokoobrotowy
    admitancja
    Opis:
    High speed squirrel-cage induction motors are supplied with a high frequency voltage ranging from 400 to 1500Hz. The highest frequencies, i.e., the highest rotation speeds, arise from technological needs and are limited by manufacturing possibilities. These motors have a structure and electromagnetic properties that differentiate them from classic machines. In particular, they are distinguished by the high frequency of supply voltage, intensive cooling introduced to reduce the size of the motor, and closed rotor slots used to minimize vibrations and noise. The paper presents how slip characteristics of admittance of a squirrel-cage motor were determined on the basis of laboratory measurements conducted with current of variable frequency. This characteristic is the geometric locus of motor admittance with the slip ranging from + ∞ to - ∞ and an assumed constant frequency of supply voltage. The image of these characteristics differs considerably from a typical pie chart and it evidences the differences in electromagnetic properties in comparison with typical induction motors. Changes in the current in the slot causes a varying state of saturation and thus rotor leakage inductance is not a constant parameter.
    Źródło:
    Maszyny Elektryczne: zeszyty problemowe; 2010, 86; 251-254
    0239-3646
    2084-5618
    Pojawia się w:
    Maszyny Elektryczne: zeszyty problemowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metoda wyznaczania rezystancji wirnika z uwzględnieniem wypierania prądu dla silników szybkoobrotowych
    A method for rotor resistance determination in high-speed motors with skin effect taken into account
    Autorzy:
    Zielińska, M.J.
    Zieliński, W.G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1374045.pdf
    Data publikacji:
    2008
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
    Tematy:
    rezystancja wirnika
    silnik szybkoobrotowy
    silniki elektryczne
    wypieranie prądu
    Opis:
    High speed motors are supplied with 400-1500Hz frequency voltage. They operate in special conditions and have a structure and properties that differentiate them from classic machines. In particular, they are distinguished by the high frequency of supply voltage, intensive cooling introduced to reduce the size of the motor, and closed rotor slots used to minimize vibrations and noise. In the discussed motors, the closed rotor slot was replaced with an open slot due to saturation of the magnetic circuit by the slot leakage flux. The resistance increase coefficient for rotor cage bar as a function of current flowing through the bar was estimated and then total rotor resistance was determined. Subsequently, the resistance calculated on the basis of geometric dimensions with skin effect taken under consideration was verified against results obtained from measurements. It was proved that short-circuit resistance is not a constant and depends on the value and frequency of current. It also includes a component which derives from additional losses occurring in solid construction elements and in rotor cage bars. The paper also presents descriptions showing changes in short-circuit resistance as a function of the motor's current determined on the basis of measurements with parametrically variable frequency.
    Źródło:
    Maszyny Elektryczne: zeszyty problemowe; 2008, 80; 155-157
    0239-3646
    2084-5618
    Pojawia się w:
    Maszyny Elektryczne: zeszyty problemowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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