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Risk of irreversible demagnetisation under transient states of the line start permanent magnet synchronous motor taking into account magnet temperature

Zawilak Tomasz, Jędryczka Cezary

Archives of Electrical Engineering

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2023

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Vol. 72, nr 4

1107--1119

EN

The paper focusses on the analysis of the demagnetisation process of permanent magnets in line-start synchronous motors in dynamic states related to start-up and resynchronisation. A field-circuit model of electromagnetic phenomena was used to analyse the demagnetisation process, taking into account the influence of temperature on the properties of permanent magnets and their resistance to demagnetisation. The results of the conducted research have shown, among other things, that the process of resynchronisation of the motor is much more dangerous from the standpoint of the risk of demagnetisation than the start-up itself.

2

Finite element analysis and experimental verification of high reliability synchronous reluctance machine

Łyskawinski Wiesław, Jędryczka Cezary, Stachowiak Dorota, Łukaszewicz Piotr, Czarnecki Michał

Eksploatacja i Niezawodność

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2022

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Vol. 24, no. 2

386--393

EN

The aim of this study was to investigate and analyse the synchronous reluctance machine. An accurate method for determining the lumped parameters of an equivalent circuit of the studied machine has been proposed. The method is based on the phase currents and voltages analysis at low slip operation. Experimental research of a synchronous reluctance machine is supplemented by simulation studies. The field-circuit model of electromagnetic phenomena in the considered motor was developed and used in simulation. The proposed method allows the numerical model to be verified by comparing the calculated and measured torqueangle characteristics of the machine. The test results obtained are presented and discussed. Achieved satisfactory concordance between simulation and experiment results proves that the proposed approach can be useful in the synthesis of reliable synchronous reluctance machines as well as in their control systems.

3

Automated test bench for research on electrostatic separation in plastic recycling application

Regulski Roman, Czarnecka-Komorowska Dorota, Jędryczka Cezary, Sędziak Dariusz, Rybarczyk Dominik, Netter Krzysztof, Barański Mariusz, Barczewski Mateusz

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2021

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Vol. 69, nr 2

art. no. e136719

EN

Many researchers in the developed countries have been intensively seeking effective methods of plastic recycling over the past years. Those techniques are necessary to protect our natural environment and save non-renewable resources. This paper presents the concept of an electrostatic separator designed as a test bench dedicated to the separation of mixed plastic waste from the automotive industry. According to the current policy of the European Union on the recycling process of the automotive industry, all these waste materials must be recycled further for re-entering into the life cycle (according to the circular economy). In this paper, the proposed concept and design of the test bench were offered the feasibility to conduct research and technological tests of the electrostatic separation process of mixed plastics. The designed test bench facilitated assessing the impact of positions of high-voltage electrodes, the value and polarity of the high voltage, the variable speed of feeders and drums, and also triboelectrification parameters (like time and intensity) on the process, among others. A specialized computer vision system has been proposed and developed to enable quick and reliable evaluation of the impact of process parameters on the efficiency of electrostatic separation. The preliminary results of the conducted tests indicated that the proposed innovative design of the research stand ensures high research potential, thanks to the high accuracy of mixed plastics in a short time. The results showed the significant impact of the corona electrode position and the value of the applied voltage on the separation process effectiveness. It can be concluded that the results confirmed the ability to determine optimally the values of the studied parameters, in terms of plastic separation effectiveness. This study showed that this concept of an electrostatic separator designed as a test bench dedicated for separation of mixed plastic waste can be widely applied in the recycling plastic industry.

4

Analysis and experimental verification of dual star permanent magnet synchronous motor with rotor back iron made of soft magnetic composite

Jędryczka Cezary, Kapelski Dariusz, Janiszewski Dariusz, Krystkowiak Michał, Danielczyk Dawid

Przegląd Elektrotechniczny

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2019

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R. 95, nr 7

12--17

EN

The research conducted at Poznan University of Technology with cooperation the Tele- and Radio Research Institute deals with finite element analysis of six-phase, dual star permanent magnet synchronous motor. To reduce eddy current losses in the rotor of the machine the rotor back iron segments have been made of soft magnetic composite (SMC). SMC are composites of iron powder particles separated with an electrically insulated layer. This technology has many advantages in relation to classical laminated core solutions; among other lower manufacturing costs due to simpler technology and reduced eddy current losses out of order times lower conductivity. The mathematical model of machine utilizes field circuit approach assuming planar symmetry of the machine. The magnetic properties of the applied SMC material have been introduced into the model basing on BH curves and unit losses vs. frequency characteristics measured at Tele- and Radio Research Institute. Accuracy of developed numerical model has been verified by measurements of the machine performance under normal and drive fault conditions tested on the elaborated research stand.

PL

Prezentowane badania, prowadzone na Politechnice Poznańskiej we współpracy z Instytutem Tele- i Radiotechnicznym dotyczą analizy i weryfikacji eksperymentalnej sześciofazowego silnika synchronicznego z magnesami stałymi. W celu ograniczenia strat związanych z występowaniem prądów wirowych w obwodzie magnetycznym wirnika maszyny jego segmenty wykonano z miękkiego kompozytu magnetycznego (SMC). W stosunku do powszechnie stosowanych rdzeni laminowanych technologia proszkowych materiałów SMC posiada wiele zalet. Między innymi dzięki znacznie większej rezystywności materiały te pozwalają ograniczyć straty wiroprądowe w rdzeniu, a dzięki uproszczeniu technologii wytwarzania możliwe jest ograniczenie kosztów produkcji. W polowo obwodowym modelu maszyny założono symetrię płaszczyznową obwodu magnetycznego maszyny oraz uwzględniono magnetyczne właściwości zastosowanego materiału SMC na podstawie krzywych BH oraz charakterystyk stratności zmierzonych w Instytucie Tele- i Radiotechnicznym. Dokładność opracowanego modelu numerycznego została zweryfikowana poprzez pomiary wybranych parametrów testowanej maszyny przeprowadzone na opracowanym stanowisku badawczym.

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Analiza i optymalizacja zgrzewów ultradźwiękowych przewodów miedzianych z wykorzystaniem logiki rozmytej

Zawadzki Jacek, Jędryczka Cezary

Poznan University of Technology Academic Journals. Electrical Engineering

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2019

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No. 100

157--166

PL

W artykule skoncentrowano się na badaniu wpływu podstawowych parametrów procesu zgrzewania ultradźwiękowego takich jak: amplituda wibracji, siła nacisku oraz czas zgrzewania na wybrane parametry jakościowe uzyskanego połączenia przewodów miedzianych. Badania przeprowadzono metodą czynnikową (ang. fractional desing) z czterema poziomami. Jako parametry jakościowe mierzono siłę zrywania (Fpull), siłę odrywania (Fpeel) oraz obszar zgrzewu. Wyniki przeprowadzonych badań eksperymentalnych wykorzystano do opracowania nieliniowego modelu regresji drugiego stopnia. Ze względu na wariację wyników badań oraz parametrów wejściowych przy tworzeniu reguł modelu wykorzystano logikę rozmytą. Zastosowanie logiki rozmytej pozwoliło na uniezależnienie się od konieczności prowadzenia badań niszczących w procesie produkcyjnym i osiągnięcie najwyższego poziomu jakości zgrzewów.

EN

Ultrasonic welding has been used in the market over the past thirty years. Very short time, low energy consumption, repeatability and lack of additional materials and operations during the connection process are key reasons for which this technology has been found advantageous in the mass production. Nevertheless the problems faced by industry regarding to ultrasonic welding are the poor weld quality and low strength of the joints surface when the welding parameters are incorrect. In this paper, the control parameters like vibration amplitude, weld pressure and weld time are considered for the welding and copper wires (Cu-ETP1). Experiment is conducted according to the fractional design with replications to get the responses like tensile shear stress and T-peel stress and weld area. Measured data are utilized to develop fuzzy logic model between responses and predictors. As a quality is an very important issue in these manufacturing industries, the optimal combinations of these parameters are found using fuzzy logic approach.