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    Wyświetlanie 1-13 z 13
    Tytuł:
    Influence of the number of turns on the performance of permanent magnet synchronous motor
    Autorzy:
    Qiu, H.
    Zhang, Y.
    Yang, C.
    Yi, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/200007.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    eddy currents density
    losses
    PMSM
    number of turns
    temperature field
    Opis:
    The current passed by the stator coil of the permanent magnet synchronous motor (PMSM) provides rotating magnetic field, and the number of turns will directly affect the performance of PMSM. In order to analyze its influence on the PMSM performance, a 3 kW, 1500 r/min PMSM is taken as an example, and the 2D transient electromagnetic field model is established. The correctness of the model is verified by comparing the experimental data and calculated data. Firstly, the finite element method (FEM) is used to calculate the electromagnetic field of the PMSM. The performance parameters of the PMSM are obtained. On this basis, the influence of the number of turns on PMSM performance is quantitatively analyzed, including current, no-load back electromotive force (EMF), overload capacity and torque. In addition, the influence of the number of turns on eddy current loss is further studied, and its variation rule is obtained, and the variation mechanism of eddy current loss is revealed. Finally, the temperature field of the PMSM is analyzed by the coupling method of electromagnetic field and temperature field, and the temperature rise law of PMSM is obtained. The analysis of this paper provides reference and practical value for the optimization design of PMSM.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 3; 429-436
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of different rotor magnetic circuit structure on the performance of permanent magnet synchronous motor
    Autorzy:
    Qiu, H.
    Yu, W.
    YANG, C.
    Yi, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/141061.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    air gap flux density
    cogging torque
    magnetic circuit structure
    overload capacity
    permanent magnet synchronous motor
    Opis:
    In order to compare the performance difference of the permanent magnet synchronous motors (PMSM) with different rotor structure, two kinds of rotor magnetic circuit structure with surface-mounted radial excitation and tangential excitation are designed respectively. By comparing and analyzing the results, the difference of the motor performance was determined. Firstly, based on the finite element method (FEM), the motor electromagnetic field performance was studied, and the magnetic field distribution of the different magnetic circuit structure was obtained. The influence mechanism of the different magnetic circuit structure on the air gap flux density was obtained by using the Fourier theory. Secondly, the cogging torque, output torque and overload capacity of the PMSM with different rotor structure were studied. The effect mechanism of the different rotor structure on the motor output property difference was obtained. The motor prototype with two kinds of rotor structure was manufactured, and the experimental study was carried out. By comparing the experimental data and simulation data, the correctness of the research is verified. This paper lays a foundation for the research on the performance of the PMSM with different magnetic circuit structure.
    Źródło:
    Archives of Electrical Engineering; 2017, 66, 3; 583-594
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on the influence of performance parameters on the super high speed permanent magnet synchronous generator external characteristic
    Autorzy:
    Qiu, H.
    Tang, B.
    Yang, C.
    Cui, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/141228.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    external characteristic
    influence degree
    performance parameters
    super high
    speed permanent magnet generator
    Opis:
    Super high speed permanent magnet generators (SHSPMG) usually operate at high frequency. The external characteristic of the SHSPMG under condition of high frequency operation is quite different from that of conventional generators. Therefore, it is necessary to study the external characteristic of the SHSPMG. Based on the finite element method, this paper studied the factors that affect the external characteristic of the SHSPMG. Combining the vector method and the finite element method, the external characteristic of the SHSPMG with the inductive load and the resistance load was studied. The variation law of the generator terminal voltage with the change of the load and current was obtained, and the key factors affecting the external characteristic of the SHSPMG were determined. The influences of the armature resistance, power factor, frequency and permanent magnet performance on the external characteristic of the SHSPMG were studied. The influence mechanism of different parameters on the generator external characteristic was revealed. The influence degree of each factor on the voltage regulation was determined. The conclusions can provide reference for the design and research of the SHSPMG.
    Źródło:
    Archives of Electrical Engineering; 2018, 67, 1; 179-192
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on the influence of driving harmonic on electromagnetic field and temperature field of permanent magnet synchronous motor
    Autorzy:
    Qiu, H.
    Yu, W.
    Li, Y.
    Yang, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/141535.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    air gap flux density
    eddy current loss
    harmonic
    magnetic field decoupling
    torque ripple
    Opis:
    At present, the drivers with different control methods are used in most of permanent magnet synchronous motors (PMSM). A current outputted by a driver contains a large number of harmonics that will cause the PMSM torque ripple, winding heating and rotor temperature rise too large and so on. In this paper, in order to determine the influence of the current harmonics on the motor performance, different harmonic currents were injected into the motor armature. Firstly, in order to study the influence of the current harmonic on the motor magnetic field, a novel decoupling method of the motor magnetic field was proposed. On this basis, the difference of harmonic content in an air gap magnetic field was studied, and the influence of a harmonic current on the air gap flux density was obtained. Secondly, by comparing the fluctuation of the motor torque in the fundamental and different harmonic currents, the influence of harmonic on a motor torque ripple was determined. Then, the influence of different current harmonics on the eddy current loss of the motor was compared and analyzed, and the influence of the drive harmonic on the eddy current loss was obtained. Finally, by using a finite element method (FEM), the motor temperature distribution with different harmonics was obtained.
    Źródło:
    Archives of Electrical Engineering; 2017, 66, 2; 295-312
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure and Impact Toughness of Offshore Steel
    Autorzy:
    Cheng, T.-C.
    Yu, C.
    Yang, T.-C.
    Huang, C.-Y.
    Lin, H.-C.
    Shiue, R.-K.
    Powiązania:
    https://bibliotekanauki.pl/articles/351264.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    low-temperature impact toughness
    prior austenite grain size
    hardenability
    bainite
    Opis:
    This study focused on the effects of microstructures on the low-temperature impact toughness of directly water-quenched offshore steel. Martensite dominated the microstructure directly below the quenched surface. In contrast, mainly lower bainite, martensite, and low amount of ferrite were observed in the central region of the quenched specimen. The ductile to brittle transition temperature of tempered martensite was significantly lower than that of a bainite-dominated microstructure. It is found that low-angle boundaries within the bainite packets greatly impair the low-temperature impact toughness of the steel. The absence of high-angle boundaries in the lower bainite packets significantly deteriorates the low-temperature impact energy of offshore steel.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 1; 167-172
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Vacuum Hot-Press Process on The Sintered Characteristics and Mechanical Properties of A High-Density Cr-31.2 Mass% Ti Alloy
    Autorzy:
    Chang, S.-H.
    Li, C.-L.
    Huang, K.-T.
    Yang, T.-H.
    Powiązania:
    https://bibliotekanauki.pl/articles/356911.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Cr-31.2 mass% Ti alloy
    vacuum hot-press sintering
    relative density
    TRS
    electrical conductivity
    Opis:
    In this study, two different compositions of submicron-structured titanium (760 nm) and micron-structured chromium (4.66 μm) powders were mixed to fabricate Cr-31.2 mass% Ti alloys by vacuum hot-press sintering. The research imposed various hot-press sintering pressures (20, 35 and 50 MPa), while the sintering temperature maintained at 1250°C for 1h. The experimental results showed that the optimum parameters of the hot-press sintered Cr-31.2 mass% Ti alloys were 1250°C at 50 MPa for 1h. Also, the relative density reached 99.94%, the closed porosity decreased to 0.04% and the hardness and transverse rupture strength (TRS) values increased to 81.90 HRA and 448.53 MPa, respectively. Moreover, the electrical conductivity is enhanced to 1.58 × 104 S·cm-1 However, the grain growth generated during the high-temperature and high-pressure of the hot-press sintering process resulted in the grain coarsening phenomenon of the Cr-31.2 mass% Ti alloys after 1250°C hot-press sintering at 50 MPa for 1h. In addition, the Cr-31.2 mass% Ti alloys were fabricated with the submicron-structured titanium (760 nm) and chromium (588 nm) powders showed more effective compaction than the micron-structured titanium (760 nm) and chromium (4.66 μm) powders did. The closed porosity decreases to 0.02% and the hardness values increase to 83.23 HRA. However, the agglomeration phenomenon of the Cr phase and brittleness of the TiCr2 Laves phases easily led to a slight decrease in TRS (400.54 MPa).
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 4; 1715-1723
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes in nutrient and heavy metal content levels of sawdust due to vermicomposting by Allomyrina dichotoma subsp. tunobosonis
    Autorzy:
    Hoang, C.N.
    Yang, Z.-W.
    Huang, M.-Y.
    Lin, K.-H.
    Yang, C.-M.
    Nguyen, M.K.
    Powiązania:
    https://bibliotekanauki.pl/articles/81229.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    vermicomposting
    organic waste
    nutrient
    heavy metal content
    sawdust substrate
    Allomyrina dichotoma
    beetle
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2019, 100, 2
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Eddy current density asymmetric distribution of damper bars in bulb tubular turbine generator
    Autorzy:
    Qiu, H.
    Fan, X.
    Yi, R.
    Feng, J.
    Wu, J.
    YANG, C.
    ZHAO, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/140467.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    damper bars
    bulb tubular turbine generator
    electromagnetic field
    eddy current
    Opis:
    The major reasons that cause the damage of damper bars in the leeward side are found in this paper. It provides a route for the structure optimization design of a hydro generator. Firstly, capacity of a 24 MW bulb tubular turbine generator is taken as an example in this paper. The transient electromagnetic field model is established, and the correctness of the model is verified by the comparison of experimental results and simulation data. Secondly, when the generator is operated at rated condition, the eddy current density distributions of damper bars are studied. And the asymmetric phenomenon of the eddy current density on damper bars is discovered. The change laws of the eddy currents in damper bars are determined through further analysis. Thirdly, through the study of eddy current distributions under different conditions, it is confirmed that the stator slots and armature reaction are the main factors to affect the asymmetric distribution of the eddy current in damper bars. Finally, the studies of the magnetic density distribution and theoretical analysis revealed the asymmetric distribution mechanism of eddy current density.
    Źródło:
    Archives of Electrical Engineering; 2017, 66, 3; 571-581
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurement of Surface Profile and Surface Roughness of Fibre-Optic Interconnect by Fast Fourier Transform
    Autorzy:
    Lin, C. S.
    Yang, S. W.
    Lin, H. L.
    Li, J. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/221117.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    surface profile
    surface roughness
    fibre end-face
    fast Fourier transform
    Opis:
    This study proposes a surface profile and roughness measurement system for a fibre-optic interconnect based on optical interferometry. On the principle of Fizeau interferometer, an interference fringe is formed on the fibre end-face of the fibre-optic interconnect, and the fringe pattern is analysed using the Fast Fourier transform method to reconstruct the surface profile. However, as the obtained surface profile contains some amount of tilt, a rule for estimating this tilt value is developed in this paper. The actual fibre end-face surface profile is obtained by subtracting the estimated tilt amount from the surface profile, as calculated by the Fast Fourier transform method, and the corresponding surface roughness can be determined. The proposed system is characterized by non-contact measurement, and the sample is not coated with a reflector during measurement. According to the experimental results, the difference between the roughness measurement result of an Atomic Force Microscope (AFM) and the measurement result of this system is less than 3 nm.
    Źródło:
    Metrology and Measurement Systems; 2017, 24, 2; 381-390
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular cloning and expression analysis of CML27 in Brassica oleracea pollination process
    Autorzy:
    Lian, X.P.
    Zeng, J.
    Zhang, H.C.
    Yang, X.H.
    Zhao, L.
    Zhu, L.Q.
    Powiązania:
    https://bibliotekanauki.pl/articles/19583.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Źródło:
    Acta Biologica Cracoviensia. Series Botanica; 2018, 60, 2
    0001-5296
    Pojawia się w:
    Acta Biologica Cracoviensia. Series Botanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pharmacokinetics of diclofenac sodium injection in swine
    Autorzy:
    Yang, H.F.
    Li, Y.J.
    Li, Y.Y.
    Huang, C.
    Huang, L.X.
    Bu, S.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087550.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    diclofenac sodium injection
    pharmacokinetics
    bioavailability
    swine
    HPLC
    Źródło:
    Polish Journal of Veterinary Sciences; 2019, 2; 423-426
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detection of self-biting behavior of mink by loop-mediated isothermal amplification (LAMP) and sequence-characterized amplified regions (SCAR)
    Autorzy:
    Liu, Z.Y.
    Song, S.S.
    Huo, Z.S.
    Song, X.C.
    Cong, B.
    Yang, F.H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087715.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mink
    self-biting
    loop-mediated isothermal amplification
    sequence-characterized amplified regions
    Źródło:
    Polish Journal of Veterinary Sciences; 2018, 21, 2; 371-376
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular characterization and expression patterns of ghrelin in the reindeer (Rangifer tarandus)
    Autorzy:
    Zhang, M.
    Xu, X.
    Zhu, X.
    Jin, X.
    Bao, H.
    Dugeer, S.
    Du, C.
    Cao, G.
    Yang, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087780.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ghrelin
    reindeer (Rangifer tarandus)
    cDNA cloning
    structural characterization
    tissue expression
    Źródło:
    Polish Journal of Veterinary Sciences; 2018, 21, 1; 55-64
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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