Wyniki wyszukiwania - BazTech

1

Operation of the induction motor supplied with a distorted voltage

Drabek Tomasz, Krzyściak Krzysztof

Science, Technology and Innovation

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2020

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Vol. 8, no. 1

13--20

EN

The paper presents the theoretical basis of the mathematical expression derived from the American standard, used to determine the thermally permissible torque load capacity of the cage induction motors when supplied with distorted voltages. The results of the measurement verification of this expression for different voltage shapes supplying the tested motor are presented. The test results confirmed the correctness of the expression when the motor is supplied with distorted voltage with a limited number of higher harmonics.

2

Electrical machines with switched and modulated flux

Kara Dawid, Kołacz Tomasz, Skwarczyński Jerzy

Science, Technology and Innovation

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2020

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Vol. 8, no. 1

1--12

EN

The work compares the value of the produced torque (average value) of a 2.2kW squirrel cage induction motor with new construction machines, i.e. a motor with flux switching and hybrid excitation or DC excited, a motor with flux modulation and hybrid excitation or DC excitation. The external dimensions of the tested machines corresponded to the dimensions of the induction motor.

3

The design of field-oriented control system with artificial neural network to control faulty induction motor

Yatsiuk Rostyslav, Mamchur Dmytro

Przegląd Elektrotechniczny

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2020

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R. 96, nr 9

30--33

EN

The paper deals with development neural network controller to ensure safe and reliable operation of damaged induction motor. It was chosen field-oriented control algorithm as a basis for neural controller aimed to provide reliable control signals both for healthy and damaged motor. It was investigated different compositions of neural network model. It was received simulation results for modified field-oriented control algorithm with neural network regulator, which showed similar results comparing to original model for healthy motor, which confirms correctness of developed model.

PL

Opisano zastosowanie sterownika wykorzystującego sieci neuronowe do stabilnej i niezawodnej pracy zdrowego lub uszkodzonego silnika indukcyjnego.

4

Experimental investigation on modified vector control algorithm for induction motor asymmetry compensation

Mamchur Dmytro

Przegląd Elektrotechniczny

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2020

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R. 96, nr 2

63--66

EN

This paper deals with experimental verification of vector-control algorithm for induction motor operation under asymmetry. Proposed algorithm allows one compensate negative influence of motor asymmetry on electric drive energy consumption parameters. Thus, it helps to ensure more effective energy consumption mode of induction motor under asymmetry. In this paper, it is described theoretical principles of asymmetry compensation algorithm, developed software and discussion of derived experimental results.

PL

Artykuł dotyczy eksperymentalnej weryfikacji algorytmu sterowania wektorowego w asymetrycznej pracy silnika indukcyjnego. Proponowany algorytm pozwala skompensować negatywny wpływ asymetrii parametry zużycia energii napędu elektrycznego. Jest tom pomocne w zapewnieniu efektywniejszego zużycia energii przy pracy asymetrycznej. W artykule opisano podstawy teoretyczne algorytmu kompensowania asymetrii. Opracowano algorytm, przedyskutowano wyniki badań eksperymentalnych.

5

Simple Technique of Initial Speed Identification for Speed-Sensorless Predictive Controlled Induction Motor Drive

Stando Dariusz, Kazmierkowski Marian P.

Power Electronics and Drives

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2020

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Vol. 5 (40)

189--197

EN

This article presents a simple technique of identifying the initial speed that allows for restarting a sensorless induction motor (IM) drive controlled by a model predictive flux control (MPFC). Initial speed identification is required because, according to the research, the applied current-model reference adaptive system (C-MRAS) can restart the IM after failure only if the error of the initial speed set in the estimator is < 25%. The proposed technique is based on short periods of flux generation for the certain initial speed and observation of the estimated torque respond. The direction of the estimated torque determines whether the real speed is higher or lower than the initial one set in the estimator. In two steps, the algorithm identifies the initial speed with an accuracy of 25%. This allows for a quick restart of the IM from any speed, eliminating the disadvantage of the sensorless drive control system with the C-MRAS speed estimator. The experimental results measured on a 50 kW drive which illustrates the operation and performances of the system are presented.

6

Sensorless Induction Motor Drive Based on Model Reference Adaptive System Scheme Utilising a Fictitious Resistance

Hajji Soufien, Chehida Ramzi Ben, Zayani Hichem, Bouaziz Noomen, Zorgani Youssef Agrebi

Power Electronics and Drives

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2020

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Vol. 5 (40)

199--212

EN

This article presents a new development of an indirect stator flux-oriented controller for sensorless speed induction motor drive utilising instantaneous and steady-state values, respectively, of a fictitious resistance symbolised as R_f. The dimension of the fictitious quantity, in this context, is the ohm, which is the difference between the stator d- and q-axis fictitious resistances. However, from the measurement of the stator voltage and currents of the machine, two independent resistance estimators are built. Therefore, the first is considered as a reference model of the induction machine (IM), and the second is considered as an adjustable model. Subsequently, the error between the states of the two models is used to drive a suitable adaptation mechanism that generates the estimation of the speed, for the adjustable model. Furthermore, the structure of the proposed estimator is free from stator resistance and eliminates the requirement of any flux computation. All the detailed simulation study is carried out in MATLAB/Simulink to validate the proposed method and to highlight the robustness and the stability of the proposed model reference adaptive system estimator.

7

Fractional Order Sliding Mode Speed Control of Feedback Linearized Induction Motor

Fetene Yeshiwas, Shibeshi Dereje

Power Electronics and Drives

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2020

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Vol. 5 (40)

109--122

EN

Induction machines have of late become the most popular workhorses in the industry replacing DC machines because of their advantages, such as reduced cost, reliability and the absence of commutators, which make them adapt to unfavourable conditions with lower maintenance requirement. However, higher-order models of AC machines, nonlinearities in model equations, uncertainties in parameters and load disturbances make induction motors difficult to control than that of DC motors. In this paper, a robust control strategy considering the recent advances in technology is proposed employing input-output feedback linearization for the exact decoupling of electromagnetic torque and rotor flux using fractional-order sliding mode controller (SMC) for the outer speed loop. The sliding mode observer is also designed to extract the rotor flux from the DC input voltage of the inverter and stator current measurements. Finally, a comparison between the commonly used proportional integral and derivative (PID) controller and the proposed fractional-order SMCs is made and the conclusion is reached.

8

Diagnosis of Short-circuits in Induction Motor Stator Winding Using a Modified Park Transformation

Tarchała Grzegorz, Wolkiewicz Marcin, Krzysztofiak Mateusz

Power Electronics and Drives

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2020

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Vol. 5 (40)

123--133

EN

This paper deals with a novel diagnostic method for finding the stator winding short-circuit damage of induction motor drives. The proposed method is based on a new, simple idea of applying a modified, triple Park transform instead of using a computationally demanding on-line Fast Fourier Transform (FFT) analysis. The diagnostic method is based on the analysis of current and reference voltage vector components, which are the part of the Direct Field Oriented Control structure. The proposed method is verified experimentally using tests results. Further, the influence of speed, load torque and the parameters of PI regulators on the performance of the proposed diagnostic method are also discussed.

9

Least square support vectors machines approach to diagnosis of stator winding short circuit fault in induction motor

Birame M’hamed, Taibi Djamel, Bessedik Sid Ahmed, Benkhoris Mohamed Fouad

Diagnostyka

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2020

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Vol. 21, No. 4

35--41

EN

Various approaches have been proposed to monitor the state of machines by intelligent techniques such as the neural network, fuzzy logic, neuro-fuzzy, pattern recognition. However, the use of LS-SVM. This article presents an automatic computerized system for the diagnosis and the monitoring of faults between turns of the stator in IM applying the LS-SVM least square support vector machine. in this study for the detection of short circuit faults in the stator winding of the induction motor. Since it requires a mathematical model suitable for modelling defects, a defective IM model is presented. The proposed method uses the stator current as input and at the output decides the state of the motor, indicating the severity of the short-circuit fault.

10

Application of deep learning neural networks for the diagnosis of electrical damage to the induction motor using the axial flux

Skowron M.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2020

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Vol. 68, nr 5

1031--1038

EN

In industrial drive systems, one of the widest group of machines are induction motors. During normal operation, these machines are exposed to various types of damages, resulting in high economic losses. Electrical circuits damages are more than half of all damages appearing in induction motors. In connection with the above, the task of early detection of machine defects becomes a priority in modern drive systems. The article presents the possibility of using deep neural networks to detect stator and rotor damages. The opportunity of detecting shorted turns and the broken rotor bars with the use of an axial flux signal is presented.

11

Open-circuit fault diagnosis in three-phase induction motor using model-based technique

Aswad Raya A. K., Jassim Bassim M. H.

Archives of Electrical Engineering

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2020

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Vol. 69, nr 4

815--827

EN

The presence of an open-circuit fault subjects a three-phase induction motor to severely unbalanced voltages that may damage the stator windings consecutively causing total shutdown of systems. Unplanned downtime is very costly. Therefore, fault diagnosis is essential for making a predictive plan for maintenance and saving the required time and cost. This paper presents a model-based diagnosis technique for diagnosing an open-circuit fault in any phase of a three-phase induction motor. The proposed strategy requires only current signals from the faulty machine to compare them with the healthy currents from an induction motor model. Then the errors of comparison are used as an objective function for a genetic algorithm that estimates the parameters of a healthy model, which they employed to identify and localize the fault. The simulation results illustrate the behaviours of basic parameters (stator and rotor resistances, self-inductances, and mutual inductance) and the number of stator winding turn parameters with respect to the location of an open-circuit fault. The results confirm that the number of stator winding turns are the useful parameters and can be utilized as an identifier for an open-circuit fault. The originality of this work is in extracting fault diagnosis features from the variations of the number of stator winding turns.

12

The generating new individuals of the population in the parametric identification of the induction motor problem with the use of the genetic algorithm

Rutczyńska-Wdowiak Katarzyna

Technical Transactions

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2019

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Vol. 116, iss. 2

109--117

EN

This paper presents the problem of the identifying parameters for use in mathematical models of induction motors with the use of a genetic algorithm (GA). The effect of arithmetical crossover and the generation of new populations on identification results is analysed. The identified parameters of the model were determined as a result of the minimisation of the performance index defined as the mean-square error of stator current and angular velocity. The experiments were performed for the low power induction motor. The steady-state genetic algorithm with regard to convergence and accuracy of the identification process and calculation time is analysed.

PL

W artykule przedstawiono problem identyfikacji parametrów modeli matematycznych silników indukcyjnych z zastosowaniem algorytmu genetycznego (AG). Analizowano wpływ krzyżowania arytmetycznego i generowania potomków na wyniki identyfikacji. Identyfikowane parametry modelu wyznaczono w rezultacie minimalizacji wskaźnika jakości zdefiniowanego jako błąd średniokwadratowy prądu stojana i prędkości kątowej. Badania eksperymentalne przeprowadzono dla silnika indukcyjnego małej mocy. Algorytm genetyczny z częściową wymianą populacji analizowano ze względu na zbieżność i dokładność procesu identyfikacji i czas obliczeń numerycznych.

13

Preliminary Study of a 200-KW Induction Motor Supplied with Voltages Containing Subharmonics

Gnaciński Piotr, Klimczak Piotr

Scientific Journal of Gdynia Maritime University

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2019

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nr 111

47--56

EN

This work deals with the preliminary investigations of a 200-kW induction cage motor with a supply voltage featuring subharmonic injection. The results of the field calculations in the MAXWELL environment are presented for subharmonics of various frequencies. It was found that subharmonics occurring in real power systems can cause overheating and premature failure of this type of machine.

14

How the axial flux of an induction motor can be used?

Petryna Janusz

Science, Technology and Innovation

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2019

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Vol. 5, no. 2

34--43

EN

The article contains the results of research within the project to apply unipolar (axial) flux to obtain diagnostic signals carrying the information of: electrical asymmetries of machinery (inter-turn stator short-circuits, cage damages); rotational speed of the rotor and load torque. Inter-turn stator short-circuits can be detected both at starting process time (when they appear most often), as well as in steady states. Detection of rotor cage defects in steady states has a character of a comparative study, and over time, as the defects develop. For standard drives that are powered from the network and work in open systems, by measuring the voltage following a unipolar flux, it is possible to make measurement and recording of motor speed, which usually is almost never provided under industrial conditions. The study shows that a simple in its construction, cheap coil can be a very useful diagnostic tool. The measurements were carried out at the laboratory and motor workplace in the power plant, while in the test station, during the loading, characteristics illustrating the dependence of the torque on the axial flux and on the rotational speed were obtained. A way of using a single measurement to estimate the torque has been proposed. The method is relatively simple to implement and allows for a fully non-invasive determination of the load torque.

15

Zastosowanie zmodyfikowanych estymatorów strumienia wirnika do kompensacji skutków zwarć zwojowych stojana silnika indukcyjnego

Dybkowski Mateusz, Bednarz Szymon Antoni

Przegląd Elektrotechniczny

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2019

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R. 95, nr 6

90--96

PL

W artykule przedstawiono szczegółową analizę wpływu uszkodzenia uzwojenia stojana silnika indukcyjnego na jakość estymacji strumienia skojarzonego wirnika w układzie sterowania wektorowego. Analizie poddano dwa układy, powszechnie znane jako symulatory zmiennych stanu, stosowane są często w przemysłowych układach napędowych. Badania przeprowadzono w układzie sterowania polowo zorientowanego (ang. DFOC – Direct Field Oriented Control). Uzyskane wyniki wykazały, że zwarcia zwojowe mogą prowadzić do niestabilnej pracy układu regulacji automatycznej. W celu zapewnienia odpowiedniej jakości estymacji - i w konsekwencji regulacji - nawet po wystąpieniu zwarć zwojowych zaproponowano zastosowanie zmodyfikowanych estymatorów strumienia wirnika. W pracy zaprezentowano szczegółową analizę teoretyczną oraz wyniki symulacji, które przeprowadzono w środowisku MATLAB/Simulink.

EN

The paper presents a detailed analysis of the impact of stator winding faults on the properties of the rotor flux estimation in the vector controlled induction motor drives. In the paper the two well-known simulators, often used in the industrial drives, were analyzed. The tests were carried out in a Direct Field Oriented Control (FOC) system. It was shown, that during inter-turn short circuits, the vector controlled system can be even unstable. To guarantee the stability during stator faults, a compensation method, based on the modified rotor flux estimators, was proposed. The article presents a detailed theoretical analysis as well as the results of simulations carried out in the MATLAB/Simulink environment.

16

Wyznaczanie parametrów modeli obwodowych silników indukcyjnych

Karolewski Bogusław, Radzik Paweł

Przegląd Elektrotechniczny

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2019

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R. 95, nr 1

223--230

PL

Podano prostą metodę wyznaczania parametrów silnika klatkowego z wykorzystaniem danych katalogowych. Sposób obliczania parametrów zintegrowano z uproszczonym sposobem uwzględniania zmian wartości parametrów wywołanych wypieraniem prądu i nasyceniem obwodów magnetycznych. Uzyskiwane wyniki porównano z rezultatami wykorzystania kalkulatorów dostępnych w internecie lub skojarzonych z programem ATP/EMTP, łącznie z wersją uwzględniającą 2 równoległe gałęzie obwodu wirnika. W celu oceny dokładności metod określania parametrów, wykonano obliczenia przebiegów rozruchowych przykładowego silnika i porównano je z pomiarowymi. Pokazano możliwość wykorzystania wyznaczonych parametrów do modelowania rozruchu, pracy prądnicowej oraz hamowania przeciwwłączeniem i nawrotu.

EN

A simple method for determining the parameters of a squirrel cage motor using the catalog data is given. The method of calculating the parameters was integrated with a simplified way of taking into account changes in parameter values caused by displacement of current and saturation of magnetic circuits. The obtained effects were compared with the results of using the calculators available on the Internet or associated with the ATP / EMTP program, including the version taking into consideration two parallel branches of the rotor. In order to assess the accuracy of methods for determining the parameters, calculations of the start-up courses of the exemplary motor were made and compared with the measuring ones. It was shown the possibility to use the designated parameters for modeling the starting, generator work as well as for back-current braking and relapse.

17

The review of methods and systems of the fault-tolerant control of variable-frequency electric drives

Zagirnyak Mykhaylo, Melnykov Viacheslav, Kalinov Andrii

Przegląd Elektrotechniczny

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2019

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R. 95, nr 1

141--144

EN

An express analysis of the methods and systems of fault-tolerant control of induction motors of variable-frequency electric drives is presented. Classification features are suggested to evaluate the possibility of using existing fault-tolerant control methods in modern variablefrequency electric drives, taking into account the capabilities of control systems. As one of the promising directions, the usage of modern p-q and cross-vector instantaneous power theories and its modifications are allocated for solving inseparable connected tasks of damages diagnostics and compensation of their influence on the operation modes of the frequency-controlled electric drive.

PL

W artykule przedstawiono analizę metod i systemów sterowania. Zasugerowano właściwości klasyfikacyjne do oceny możliwości wykorzystania istniejących metod sterowania w nowoczesnych napędach elektrycznych o zmiennej częstotliwości, biorąc pod uwagę ich operatywność. Jeden z obiecujących kierunków, a mianowicie użycie nowoczesnych teorii mocy oraz ich modyfikacje s ą przydzielone do rozwiązywania nierozdzielnie związanych zadań diagnozowania uszkodzeń i kompensacji ich wpływu na stany działania zmiennoczęstotliwościowych napędów elektrycznych.

18

Performance improvement of ANFIS with sliding mode based on MRAS sensorless speed controller for induction motor drive

Fereka Dhaouia, Zerikat Mokhtar, Belaidi Abdelkader, Chekroun Soufyane

Przegląd Elektrotechniczny

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2019

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R. 95, nr 12

269--275

EN

This paper is focused on a performance improvement of ANFIS with sliding mode based on MRAS sensorless speed controller for induction motor drive associated with the IFOC strategy. The control strategy consists of the combination of the sliding mode with the ANFIS strategy. In order to estimate the speed of the IM, MRAS sensorless strategy associated with ANFIS system is used. This controller has high accuracy, suitable performance, high robustness and high tracking efficiency. To provide a numerical comparison between different controllers, a performance index based on speed error is assigned. The obtained results show that ANFIS Controller associated with MRAS observer overcome the problem of estimation of the speed of the motor particularly at low speed. The main advantages of the proposed method are the robustness to parameter variations and load changes.

PL

W artykule analizowano możliwość poprawy systemu ANFIS ze ślizgowym bezczujnikowym sterownikiem prędkości silnika indukcyjnego. Dla porównania różnych sterowników wprowadzono indeks bazujący na błędzie prędkości. Wykazano że system ANFIS z obserwatorem MRAS rozwiązuje problem określania prędkości szczególnie przy małych prędkościach.

19

Investigation of properties of disk-type motor electromagnetic circuit using alternative materials in stator/rotor core

Wolnik Tomasz

Przegląd Elektrotechniczny

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2019

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R. 95, nr 12

59--63

EN

Improved energy efficiency, limitation of production costs or increased power density of electrical machines are among principal incentives in searching for new, innovative designs. Undoubtedly, one of innovation features is application of alternative materials, which results in accomplishment of required technical or economic advantages. Different design variants of electromagnetic circuit of induction disk-type motor have been presented in this paper; these variants use alternative materials for stator and rotor cores. Results of calculations and lab tests of a model motor have been given. Cores of the motor models have been made of amorphous strip, of M470-50 electrical sheet, of solid steel and of Vacoflux48 strip with high flux density saturation values.

PL

Zwiększenie efektywności energetycznej, ograniczenie kosztów produkcji lub zwiększenie gęstości mocy maszyn elektrycznych jest główną motywacją do poszukiwania innowacyjnych w tym zakresie rozwiązań konstrukcyjnych. Jednym z aspektów innowacyjności jest bez wątpienia wykorzystywanie alternatywnych materiałów, pozwalających na osiągnięcie danej korzyści czy to technicznej czy ekonomicznej. W niniejszym artykule przedstawiono oraz przeanalizowano różne rozwiązania konstrukcyjne obwodu elektromagnetycznego indukcyjnego silnika tarczowego wykorzystującego alternatywne materiały rdzeni stojana i wirnika. Przedstawiono wyniki obliczeń oraz wyniki badań laboratoryjnych modelowego silnika, którego rdzenie wykonane zostały między innymi z taśmy amorficznej, z blachy M470-50, z litej stali oraz z taśmy Vacoflux48 o wysokich wartościach indukcji nasycenia.

20

Fuzzy direct torque control for induction motor sensorless drive powered by five level inverter with reduction rule base

Berkani Abderrahmane, Negadi Karim, Allaoui Tayeb, Marignetti Fabrizio

Przegląd Elektrotechniczny

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2019

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R. 95, nr 7

66--71

EN

The object of this paper is to study a new control structure for sensorless induction machine dedicated to electrical drives using a five-level voltage source inverter (VSI). However, direct torque control (DTC), known for years, provides high dynamic performance and also fast and robust response for induction motors (IM), classical DTC produces notable torque, flux ripples. In the present paper, fuzzy logic has been suggested to improve the system performance (i.e. gives faster torque and flux responses and also reducing the undesirable torque ripple that can occur in the output torque). In this controller, torque error, flux error and also the position of stator flux are as inputs and the output of it is a suitable voltage vector which should apply to the motor. In this paper to reduce the number of rules and also increase controller’s speed, we use particular mapping for the stator flux position. Compared with conventional DTC, this method is easily implemented for induction machine, the ripples of both torque and flux are reduced remarkable. Simulation results proved the superiority of the novel approach.

PL

Celem tego artykułu jest zbadanie nowej struktury sterowania bezczujnikowej maszyny indukcyjnej przeznaczonej do napędów elektrycznych z wykorzystaniem pięciopoziomowego falownika napięcia (VSI). Wiadomo jednak, że bezpośrednia sterowanie momentu obrotowego (DTC), znane od lat zapewnia wysoką dynamikę, a także szybką i solidną reakcję dla silników indukcyjnych (IM), klasyczny algorytm DTC wytwarza znaczny moment obrotowy, tętnienia strumienia. W niniejszym artykule zasugerowano logikę rozmytą, aby poprawić wydajność systemu (tzn. daje szybszą zmianę momentu obrotowego i odpowiedzi strumienia, a także zmniejsza niepożądane tętnienia momentu obrotowego, które mogą wystąpić w wyjściowym momencie obrotowym). W tym regulatorze, błąd momentu obrotowego, błąd strumienia, a także położenie strumienia stojana są jako wejścia, a jego wyjście jest odpowiednim wektorem napięcia, który powinien być zastosowany do sterowania silnika. W tym artykule, aby zmniejszyć liczbę reguł, a także zwiększyć szybkość kontrolera, używamy konkretnego odwzorowania dla położenia strumienia stojana. W porównaniu z konwencjonalnym kodem DTC ta metoda jest łatwa do zastosowania w maszynach indukcyjnych, a tętnienia momentu obrotowego i strumienia są znacznie mniejsze. Wyniki symulacji dowiodły wyższości nowatorskiego podejścia.