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    Wyświetlanie 1-3 z 3
    Tytuł:
    Fixed point properties for semigroups of nonexpansive mappings on convex sets in dual Banach spaces
    Autorzy:
    Lau, Anthony To-Ming
    Zhang, Yong
    Powiązania:
    https://bibliotekanauki.pl/articles/744659.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie
    Tematy:
    amenability
    semigroups
    non-expansive mappings
    weak*-compact convex sets
    common fixed point
    invariant mean
    submean
    Źródło:
    Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica; 2018, 17
    2300-133X
    Pojawia się w:
    Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance analysis and comparison of PMSM with concentrated winding and distributed winding
    Autorzy:
    Qiu, Hongbo
    Zhang, Yong
    Yang, Cunxiang
    Yi, Ran
    Powiązania:
    https://bibliotekanauki.pl/articles/141179.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    air-gap flux density
    cogging torque
    concentrated winding
    distributed winding
    efficiency
    loss
    PMSM
    Opis:
    The concentrated winding (CW) is obviously different from the traditional distributed winding (DW) in the arrangement of windings and the calculation of winding factors, which will inevitably lead to different performances of the permanent magnet synchronous motor (PMSM). In order to analyze the differences between the CW and the DW in the performance, a 3 kW, 1500 r/min PMSM is taken as an example to establish a 2-D finite element model. The correctness of the model is verified by comparing experimental data and calculated data. Firstly, the finite element method (FEM) is used to calculate the electromagnetic field of the PMSM, and the performance parameters of the PMSM are obtained. On this basis, the influences of the two winding structures on the performance are quantitatively analyzed, and the differences between the two winding structures on the performance of the PMSM will be determined. Finally, the differences of efficiency between the two winding structures are obtained. In addition, the influences of the winding structures on eddy current loss are further studied, and the mechanism of eddy current loss is revealed by studying the eddy current density. The analysis of this paper provides reference and practical value for the optimization design of the PMSM.
    Źródło:
    Archives of Electrical Engineering; 2020, 69, 2; 303-317
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of harmonic voltage coupling on torque ripple of permanent magnet synchronous motor
    Autorzy:
    Geng, Shengtao
    Zhang, Yong
    Qiu, Hongbo
    Yang, Cunxiang
    Yi, Ran
    Powiązania:
    https://bibliotekanauki.pl/articles/140572.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    PMSM
    harmonic voltage coupling
    torque ripple
    inverter
    Opis:
    The permanent magnet synchronous motor (PMSM) driven by an inverter is widely used in the industrial field, but the inverter has a significant impact on the operational stability of the PMSM. The torque ripple of the PMSM is directly affected by the coupling of multiple harmonic voltages in the motor windings. In order to analyze its influence, a water-cooled PMSM with 20 kW 2000 r/min is taken as an example to establish the finite element model of the prototype, and the correctness of the model is verified by experiments. Firstly, based on the finite element method, the electromagnetic field of the PMSM is numerically solved in different operating states, and the performance parameters of the PMSM are obtained. Based on these parameters, the influence of the harmonic voltage amplitude on the torque ripple is studied, and the influence law is obtained. Secondly, combined with the decoupling analysis method, the influence of harmonic voltage coupling on the torque ripple is compared and analyzed, and the variation law of harmonic voltage coupling on the torque ripple is obtained. In addition, the influence of different harmonic voltage coupling on the average torque of the PMSM is studied, and the influence degree of different harmonic voltage amplitude on the torque fluctuation is determined. The conclusion of this paper provides reliable theoretical guidance for improving motor performance.
    Źródło:
    Archives of Electrical Engineering; 2019, 68, 2; 399-410
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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