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1
Diagnostyka prętów w klatce silnika indukcyjnego
Polak A., Barański M.
Śląskie Wiadomości Elektryczne
|
2013
|
Nr 6 (111)
20--23
PL
W artykule przedstawiono metodę diagnostyki klatki wirnika silnika indukcyjnego. Autorzy przedstawiają wyniki badań detektorem dla wirników: z klatką nieuszkodzoną oraz dla kilku wirników z klatką uszkodzoną w różnym stopniu. Opisany detektor jest to bardzo dobre narzędzie diagnostyczne do wykrywania przerw w prętach klatki maszyny asynchronicznej. Znajduje on zastosowanie w diagnostyce wirników jednoklapkowych z otwartym żłobkiem. Urządzenie zostało zaprojektowane i skonstruowane przez Autorów. Badania polegają na pomiarze każdego pręta z osobna.
EN
The article discusses the method of diagnostics of the rods of the squirrel-cage of induction motor. The authors introduces the results of research with detector tor rotor with not-detected of the squirrel-cage and for several rotors with the squirrel-cage detected in various stage. The described detector is the very good diagnostic tool for detection the gaps inside the rods of the squirrel-cage of the asynchronous machines. That detector has employed in the diagnostics of single-squirrel-cages with open-slots. That detector was designed and build by the authors. The researches consist in measurement for each rod individually.
2
Content available remote Squirrel cage`s bars diagnostic – selected methods
Barański M., Polak A.
Przegląd Elektrotechniczny
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2012
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R. 88, nr 9a
193-195
EN
This article presents two types of squirrel cage rotor`s diagnostic methods. First of them is noninvasive, second is on rotor taken out from electrical machine. Authors describe tests on electrical machines with healthy and broken squirrel cage rotor. Tested several squirrel cage rotors with different damages. Paper presents the results of studies conducted by the authors. It is intended to search better methods of researches, that will improve the accuracy of opinion issued.
PL
Ten artykuł przedstawia dwie metody diagnostyki klatki wirnika. Pierwsza z nich jest nieinwazyjna, druga wymaga wyjęcia wirnika z maszyny. Autorzy opisują badania silników elektrycznych zarówno z klatką nieuszkodzoną jak i z klatką posiadającą uszkodzone pręty. Przetestowano kilka wirników z różnym stopniem uszkodzenia. Artykuł przedstawia wyniki badań przeprowadzonych przez autorów. Jego intencją jest wyszukanie najlepszej metody diagnostyczne do zaimplementowania w przemyśle.
3
Content available Detektor do wykrywania przerw w prętach wirników jednoklatkowych
Barański M., Polak A.
Maszyny Elektryczne : zeszyty problemowe
|
2011
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Nr 1(89)
45-48
EN
This article presents method of squirrel cage rotor`s diagnostic. Authors describe tests on electrical machines with healthy and broken squirrel cage rotor. There were tested several squirrel cage rotors with different damages. Authors describes very good tool for diagnostic bars of cage. This is break detector of rotor bars of induction motors with one cage. This device was designed and constructed by the authors. Technical assessment of the bar in the cage of rotor is performed by measurement each bar individually. Patent application No. P382389. Paper presents the results of studies conducted by the authors.
4
Content available Squirrel cage induction motors with idle bars
Bernatt J.
Archives of Electrical Engineering
|
2010
|
Vol. 59, nr 1-2
79-86
EN
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.
5
Content available Technologiczne i eksploatacyjne skutki zmian kształtu pręta klatki silnika indukcyjnego dużej mocy
Antal M., Chamerski J., Piłat W., Antal L.
Maszyny Elektryczne : zeszyty problemowe
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2008
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Nr 79
17-22
EN
Field-circuit model of electric machine can be used for investigation of its structural components shape influence on operating characteristics. The high power induction motor model was applied to examine effects of rotor bar shape modification, consisting in replacement the trapezium shape bar with rectangular bar. Torque and current characteristics and characteristic quantity of start-up torque and current, maximum torque and critical slip were determined with field-circuit model. Electromagnetic torque, currents and rotational speed, as function of time during motor start, were determined also. The effect of rotor bar height change were examined in similar way. All rotor bar shape modifications were realized with constant cross-sectional area. The results confirm, that the exchange of bars in considered design will bring economic profits and won't cause significant deterioration of operating features.
6
Content available Rekonstrukcja wirnika w silniku 800 kW, 2p=4, 6 kV w celu przystosowania uzwojenia klatkowego do trudnych warunków pracy
Poprawski W.
Maszyny Elektryczne : zeszyty problemowe
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2008
|
Nr 79
13-15
EN
In the paper the case of the squirrel cage failure in high voltage induction motor is described. This motor is operating in the drive characterised by long starting time and by very high and frequent overloads. The analysis of drive operation and reasons of failure curried out. The changes in rotor construction has been proposed to increase the motor service life.
7
Zastosowanie sztucznych sieci neuronowych do wykrywania uszkodzeń klatki wirnika silnika indukcyjnego metodą analizy widmowej prądu
Dzierżanowski M.
Zeszyty Naukowe. Elektryka / Politechnika Opolska
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2007
|
Vol. 322, z. 59
13-14
EN
The paper shows that on the basic of current spectroanalysis the quality of squirrel cage of induction motor can be established. Later the use of such a spectrum was suggested for training data for artificial neural network. Neural network, in the study process is able to detect damages in squirrel cage.
8
Silniki z odlewaną miedzianą klatką wirnika - aktualna sytuacja
Zapaśnik R.
Nowa Elektrotechnika
|
2007
|
nr 9 (37)
14--17
9
Content available Zagadnienia kształtu i materiału prętów klatki wirnika sinika indukcyjnego przeznaczonego do pracy w warunkach kriogenicznych
Azarewicz S., Węgliński B.
Maszyny Elektryczne : zeszyty problemowe
|
2007
|
Nr 77
83-86
EN
Electrical motors operating at low temperatures and in aggressive environment, such as liquid natural gas for instance, should exhibit high reliability, efficiency, and good electromagnetic parameters, both in dynamic and static states as well. Low working temperature has significant influence on change of parameters of conductive materials, and electrical sheets. Changes of their parameters determine run and values of the current and torque during start of the cage induction motor. The paper presents results of laboratory tests, calculations, and computer simulations of parameters changes of conductive and magnetic materials submerged in liquid gas with temperature of-161°C. Results of calculation targeting to elaboration a way of the starting current decreasing and starting torque increasing of cage induction motors working at very low temperatures are given. The shape, cross-section and material of a rotor's cage are the most influential elements on the above mentioned motor's parameters. That is why the paper presents chosen results of the influence analyze of these elements on the torque and current values and runs of the studied motor.
10
Content available Silniki indukcyjne z miedzianą odlewaną klatką wirnika - nowe problemy i nowe perspektywy
Zapaśnik R.
Maszyny Elektryczne : zeszyty problemowe
|
2007
|
Nr 76
1-4
EN
Inclusion in the last time the research centers and the great manufacturers to topic of the motors with die - casting copper rotors has caused that on the one hand the new technological and material problems have been elicited and on the other hand the new fields of the application of the such motors have been discovered.
11
Content available Silniki indukcyjne klatkowe z wirnikiem zalewanym miedzią
Graczyk M.
Maszyny Elektryczne : zeszyty problemowe
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2006
|
Nr 74
5-9
EN
One of the ways to improve the efficiency of an induction motor without increasing of frame size is to change the rotor cage material from aluminum to copper. Thanks to such an operation, the rotor cage resistance is decreased by about 40% and rotor's resistance losses are also significantly decreased. In consequence the efficiency of induction motor is higher by 1 to a few percent (depending on motor size and power). The copper rotor cages have been manufactured for many years using prefabricated copper bars. Such a construction of rotor cage is relatively expensive in manufacturing, and this is the main reason why this construction is usually used only in high power induction motors. Low and middle power induction motors have, in more cases, the rotor cage manufactured as an aluminum casting because of simple and inexpensive manufacturing technology. Since a few years in foreign technical papers and books an increased interest in casting of rotor cages with copper can be observed. In this paper the advantages and benefits of using rotor cages with copper casting are presented and discussed on an example of 4 pole induction motor with frame size 132.
12
Content available Wpływ poziomu uszkodzenia pręta klatki wirnika silnika indukcyjnego na jego rezystancję
Dybowski P.
Maszyny Elektryczne : zeszyty problemowe
|
2005
|
Nr 72
103-106
EN
In calculations of failure state of induction machines damage of squirrel-cage is simulated by magnify of resistance bars or ring segments. In this paper I'm going to answer a questions: in which way resistance of bar or ring segment is changing with level of failure? What level of resistance can I use as damage of bar? Have a precision of production of squirrel-cage an effect on resistance of bars? To answer these questions I made some simulations of this problem.
13
Content available Sprzężone pole magneto-termiczne silnika indukcyjnego z uszkodzoną klatką wirnika
Antal M., Zawilak J.
Maszyny Elektryczne : zeszyty problemowe
|
2005
|
Nr 72
267-272
EN
The work presented calculation results of a small power (1.5 kW) squirrel cage motor warm-up. Computation was realized with normal load. There is two models: one with non-damaged rotor and second one with three broken rotor bars. Calculation of coupling transient magneto-thermal field was realized with two-dimensional field-circuit motor model. There is a linear temperature characteristic of aluminum resistivity in squirrel cage, and a linear temperature characteristic of a thermal parameters in squirrel cage and core. Heating characteristic of motor with non-damaged rotor and another one with three broken rotor bars was compared. Heat distribution in rotor was investigated in both situation, in thermal transient state and after.
14
Content available Silniki indukcyjne z miedzianą odlewaną klatką wirnika
Zapaśnik R.
Maszyny Elektryczne : zeszyty problemowe
|
2005
|
Nr 71
1-6
EN
Die-cast copper rotor motors as the new kind of the squirrel cage induction motors. Main performance of the motors where copper has been substituted for aluminum in the rotor squirrel cage. Today's word-wide situation in the field of the production of the die-cast copper rotor induction motors. Perspectives of the industrial expansion of this kind of motors as the profitable alternative to ordinary motors with aluminum squirrel cage.
15
Content available O możliwości wczesnego wykrywania pęknięć prętów klatki wirnika podczas pracy maszyny asynchronicznej
Strycharz J.
Maszyny Elektryczne : zeszyty problemowe
|
2005
|
Nr 71
91-96
EN
Some utilizing possibilities of induction motor stator phase current vector function hodographs as diagnostic signals to rotor cage bars (rings) ruptures early discovering during machine work have been described in the paper. As a result of rotor asymmetry, caused by cage bars ruptures, some (1 š2ks)f frequency band currents are induced in the stator, which are overlapping current base frequency (L=50Hz) component. In cases of rotor damages, hodograph course is deformed, comparing to not damaged motor hodograph course. Hodograph deformations, characteristic for rotor bar ruptures have been illustrated by a lot of oscillograph records received during laboratory investigations. These investigations have been carried out for damaged motor feeding cases by voltages from power network and from voltage frequency changers. Hodograph deformations characteristic features for rotor bars damage cases are also seen during simultaneous appearance of other dis-turbances as, for example, impedance asymmetry in one of phases or feeding voltages. It's properly to remark that with the number of ruptured bars the diagnostic signal value and its pulsation can diminished and even lesser values can be received then for little number of ruptured bars. For this reason it's useful to carry out the best continuous or from time to time cage bars control (monitoring), because it permits to discover damages already in initial stadium and by this to exclusion next bar damages and serious machine damages appearance. Diagnostic method proposed should be numbered to non invaded methods. In the solution, which is based on observation and evaluation of motor stator phase current hodographs, could be approved generally machine current measuring system which exist in industrial systems.
16
Content available remote Silniki indukcyjne o podwyższonej sprawności - aspekty normalizacyjne, techniczne i ekonomiczne
Gąsiorowski T., Wieczorek A.
Napędy i Sterowanie
|
2000
|
R. 2, nr 7/8
20--23
PL
W dobie końca XX wieku mamy do czynienia z gwałtownym wyczerpywaniem się zasobów naturalnych, a co za tym idzie również konwencjonalnych źródeł energii elektrycznej. W Polsce 95% energii wytwarza się za pomocą "brudnej ekologicznie" technologii spalania węgla. Krajowa energetyka, oparta na spalaniu paliw stałych, rocznie zużywa ok. 41 mln ton węgla kamiennego i ponad 65 mln ton węgla brunatnego, emitując do powietrza m.in. 147 mln ton CO2 (dane z roku 1995). Skutkiem takiego sposobu wytwarzania energii elektrycznej jest duże zanieczyszczenie środowiska oraz sukcesywny wzrost udziału kosztów energii elektrycznej w całkowitych kosztach działalności przedsiębiorstw.
17
O możliwości zastosowania hodografów wektora prądu maszyny asynchronicznej do wykrywania uszkodzeń klatki wirnika
Strycharz J.
Prace Naukowe Politechniki Warszawskiej. Elektryka
|
1999
|
z. 111
327-335
PL
Omówiono, proponowane w literaturze w ostatnich latach, metody wykrywania uszkodzeń klatki wirnika silnika asynchronicznego, umożliwiające diagnostykę silnika podczas jego normalnej eksploatacji. W szerszym zakresie przedstawiono możliwość wykorzystania hodografów prądu stojana maszyny asynchronicznej do wykrywania pęknięć prętów klatki wirnika. Uzyskane na drodze teoretycznej oraz z pomiarów laboratoryjnych hodografy dla przypadków uszkodzeń prętów wirnika mają charakterystyczny przebieg w porównaniu z przebiegiem hodografu dla silnika z nie uszkodzoną klatką wirnika. Cechy charakterystyczne hodografów dla silników z uszkodzonym wirnikiem widoczne są również w przypadku niesinusoidalnych napięć zasilających silnik, jak i przy zmiennym momencie obciążenia.
EN
The method of discovering the defects and the deteriorations of the rotor cage of the induction motor have been described lately in several publications. The above methods enables the diagnostics of the motor during its normal operation. The broad rangę of the possibility of the hodographs of the induction motor stator currents to discovering the detoriorations of rotor bars has been discussed in the paper. The results received by theoretical means and laboratory tests as well, arę shown; they arę quite specific for the defected rotor bars, when compared with the hodographs ofthe motors with the "healthy" rotor bars. The characteristic features of the hodographs of the defected rotor bars are visible for the non-sinusoidal supply voltage, and for the variable motor load torque as well.
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