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    Wyświetlanie 1-3 z 3
    Tytuł:
    Analysis of IPM motor parameters in an 80-kW traction motor
    Autorzy:
    Młot, Adrian
    Kowol, Marcin
    Kołodziej, Janusz
    Lechowicz, Andrzej
    Skrobotowicz, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/140570.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electromagnetic review
    electric vehicle
    IPM motor
    permanent magnet brushless motor
    radial flux permanent magnet motor
    V-shaped interior permanent magnet
    Opis:
    This paper presents a review of the electromagnetic field and a performance analysis of a radial flux interior permanent magnet (IPM) machine designed to achieve 80 kW and 125 Nm for an electric and hybrid traction vehicle. The motor consists of a 12-slot stator with a three-phase concentrated winding as well as an 8-pole rotor with V-shaped magnets. Selected motor parameters obtained from an IPM prototype were compared with the design requirements. Based on the electromagnetic field analysis, the authors have indicated the parts of the motor that should be redesigned, including the structure of the rotor core, aimed at enhancing the motor’s performance and adjusting segmentation for magnet eddy current loss reduction. In addition, iron and PM eddy current losses were investigated. Moreover, transient analysis of current peak value showed that the current may increase significantly compared to steady-state values. A map of transient peak current load vs. torque load plotted against rotor speed was provided. Based on the numeric and analytical results of physical machine parameters, the authors indicate that collapse load during the motor’s operation may significantly increase the risk of permanent magnet (PM) demagnetization. It was also found that collapse load increases the transient torque, which may reduce the lifetime of windings.
    Źródło:
    Archives of Electrical Engineering; 2020, 69, 2; 467-481
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electromagnetic analysis, efficiency map and thermal analysis of an 80-kW IPM motor with distributed and concentrated winding for electric vehicle applications
    Autorzy:
    Młot, Adrian
    Korkosz, Mariusz
    Lechowicz, Andrzej
    Podhajecki, Jerzy
    Rawicki, Stanisław
    Powiązania:
    https://bibliotekanauki.pl/articles/2172808.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    AC losses
    concentrated winding
    distributed winding
    motor performance
    radial flux permanent magnet motor
    slot fill factor
    thermal analysis
    Opis:
    This paper presents a comparison of an AC radial flux interior permanent magnet (IPM) motor with the distributed winding (DW) and concentrated winding (CW). From time to time, manufacturers of electric vehicles change the design of electric motors, such changes may include changing the DW into CW and vice versa. A change to the winding in a radial permanent magnet synchronous motor may lead to a change in motor parameters during motor operation and /or change in the distribution of the magnetic field and thermal circuit of the electrical machine. The electromagnetic analysis, efficiency map, mechanical stress, and thermal analysis of the machine with the DW and CW are presented in this paper. This article describes the advantages and disadvantages of selected stator winding designs and helps understand manufacturers’ designers how the DW and CW play a key role in achieving the designed motor’s operational parameters such as continuous performance. Analyzing the performance of both machines will help identify their advantages and disadvantages with regard to thermal phenomena, magnetic field and operational parameters of the presented IPM prototypes. Both prototypes are based on commonly used topologies such as 12/8 (slot/pole) and 30/8 (slot/pole) IPM motors consisting of magnets arranged in a V-shape. The AC IPM motor was designed for an 80 kW propulsion system to achieve 170 N·m at a base speed of 4 500 rpm. Modern CAD tools are utilized throughout the numerical computations based on 2-D finite element methods. Selected test data are used to verify and validate the accuracy of finite element models.
    Źródło:
    Archives of Electrical Engineering; 2022, 71, 4; 981--1002
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    1000 Liver Transplantations at the Department of General, Transplant and Liver Surgery, Medical University of Warsaw - Analysis of Indications and Results
    Autorzy:
    Krawczyk, Marek
    Grąt, Michał
    Barski, Krzysztof
    Ligocka, Joanna
    Antczak, Arkadiusz
    Kornasiewicz, Oskar
    Skalski, Michał
    Patkowski, Waldemar
    Nyckowski, Paweł
    Zieniewicz, Krzysztof
    Grzelak, Ireneusz
    Pawlak, Jacek
    Alsharabi, Abdulsalam
    Wróblewski, Tadeusz
    Paluszkiewicz, Rafał
    Najnigier, Bogusław
    Dudek, Krzysztof
    Remiszewski, Piotr
    Smoter, Piotr
    Grodzicki, Mariusz
    Korba, Michał
    Kotulski, Marcin
    Cieślak, Bartosz
    Kalinowski, Piotr
    Gierej, Piotr
    Frączek, Mariusz
    Rdzanek, Łukasz
    Stankiewicz, Rafał
    Kobryń, Konrad
    Nazarewski, Łukasz
    Leonowicz, Dorota
    Urban-Lechowicz, Magdalena
    Skwarek, Anna
    Giercuszkiewicz, Dorota
    Paczkowska, Agata
    Piwowarska, Jolanta
    Gelo, Remigiusz
    Andruszkiewicz, Paweł
    Brudkowska, Anna
    Andrzejewska, Renata
    Niewiński, Grzegorz
    Kilińska, Beata
    Zarzycka, Aleksandra
    Nowak, Robert
    Kosiński, Cezary
    Korta, Teresa
    Ołdakowska-Jedynak, Urszula
    Sańko-Resmer, Joanna
    Foroncewicz, Bartosz
    Ziółkowski, Jacek
    Mucha, Krzysztof
    Senatorski, Grzegorz
    Pączek, Leszek
    Habior, Andrzej
    Lechowicz, Robert
    Polański, Sławomir
    Leowska, Elżbieta
    Pacho, Ryszard
    Andrzejewska, Małgorzata
    Rowiński, Olgierd
    Kozieł, Sławomir
    Żurakowski, Jerzy
    Ziarkiewicz-Wróblewska, Bogna
    Górnicka, Barbara
    Hevelke, Piotr
    Michałowicz, Bogdan
    Karwowski, Andrzej
    Szczerbań, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/1396689.pdf
    Data publikacji:
    2012-06-01
    Wydawca:
    Index Copernicus International
    Tematy:
    liver transplantation
    indications
    results
    mortality
    Opis:
    The aim of the study was to analyze indications and results of the first one thousand liver transplantations at Chair and Clinic of General, Transplantation and Liver Surgery, Medical University of Warsaw.Material and methods. Data from 1000 transplantations (944 patients) performed at Chair and Clinic of General, Transplantation and Liver Surgery between 1994 and 2011 were analyzed retrospectively. These included 943 first transplantations and 55 retransplantations and 2 re-retransplantations. Frequency of particular indications for first transplantation and retransplantations was established. Perioperative mortality was defined as death within 30 days after the transplantation. Kaplan-Meier survival analysis was used to estimate 5-year patient and graft survival.Results. The most common indications for first transplantation included: liver failure caused by hepatitis C infection (27.8%) and hepatitis B infection (18%) and alcoholic liver disease (17.7%). Early (< 6 months) and late (> 6 months) retransplantations were dominated by hepatic artery thrombosis (54.3%) and recurrence of the underlying disease (45%). Perioperative mortality rate was 8.9% for first transplantations and 34.5% for retransplantations. Five-year patient and graft survival rate was 74.3% and 71%, respectively, after first transplantations and 54.7% and 52.9%, respectively, after retransplantations.Conclusions. Development of liver transplantation program provided more than 1000 transplantations and excellent long-term results. Liver failure caused by hepatitis C and B infections remains the most common cause of liver transplantation and structure of other indications is consistent with European data.
    Źródło:
    Polish Journal of Surgery; 2012, 84, 6; 304-312
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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