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    Wyświetlanie 1-10 z 10
    Tytuł:
    Application of Fractal Analysis Methods for Lift Height Optimization in Magnetic Force Microscopy Measurements
    Autorzy:
    Bramowicz, M.
    Kulesza, S.
    Chrostek, T.
    Sendrowski, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/354969.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    lift height optimization
    magnetic force microscopy
    fractal analysis
    Opis:
    The paper presents results of a research on simulation of magnetic tip-surface interaction as a function of the lift height in the magnetic force microscopy. As expected, magnetic signal monotonically decays with increasing lift height, but the question aris es, whether or not optimal lift height eventually exists. To estimate such a lift height simple procedure is proposed in the paper based on the minimization of the fractal dimension of the averaged profile of the MFM signal. In this case, the fractal dimension ser ves as a measure of distortion of a pure tip-surface magnetic coupling by various side effects, e.g. thermal noise and contribution of topographic features. Obtained simulation results apparently agree with experimental data.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 3; 1109-1113
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cogging torque and torque ripple analysis of permanent magnet flux-switching machine having two stators
    Autorzy:
    Awah, Chukwuemeka Chijioke
    Okoro, Ogbonnaya Inya
    Chikuni, Edward
    Powiązania:
    https://bibliotekanauki.pl/articles/140414.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cogging torque
    torque ripple
    separate stators
    unbalanced magnetic force
    Opis:
    The analysis of cogging torque, torque ripple and total harmonic distortion of a permanent magnet (PM) flux-switching machine having separate excitation stators is presented in this study. Further, the effect of unbalanced magnetic force (UMF) on the rotor of this machine is also investigated. A comparison of the analysed machine having different rotor pole configurations is also given. The analysis shows that the largest cogging torque, torque ripple as well as total harmonic distortion (THD) are obtained in the four-rotor-pole machine while the least of THD and torque ripple effects is seen in the thirteen-rotor-pole machine. Furthermore, the evaluation of the radial magnetic force of the machines having an odd number of rotor poles shows that the investigated machine having a five-rotor-pole number exhibits the highest value of UMF, while the smallest amount of UMF is obtained in an eleven-rotor-pole machine. Similarly, it is observed that the machines having an even number of rotor poles exhibit a negligible amount of UMF compared to the ones of the odd number of rotor poles.
    Źródło:
    Archives of Electrical Engineering; 2019, 68, 1; 115-133
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of the Autocorrelation Function and Fractal Geometry Methods for Analysis of MFM Images
    Zastosowanie funkcji autokorelacji oraz geometrii fraktalnej do analizy obrazów struktur domenowych rejestrowanych metodą MFM
    Autorzy:
    Bramowicz, M.
    Kulesza, S.
    Czaja, P.
    Maziarz, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/352007.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    atomic force microscopy (AFM)
    magnetic force microscopy
    magnetic domains
    fractal analysis
    mikroskopia sił magnetycznych
    MFM
    analiza fraktalna
    Opis:
    Presented work is focused on the use of correlation methods for numerical analysis of magnetic stray field over the surface of materials. Obtained results extend our previous findings about application of the autocorrelation function and the fractal analysis for characterization of magnetic surfaces. Several domain images are recorded at various tip-sample gaps (i.e. the lift heights), and then their average widths were extrapolated down to the zero distance in order to estimate the width seen right on the surface. Apart from that, fractal parameters were derived from autocorrelation function, which turned out to be sensitive to the lift height, and might constitute universal measure (the critical lift height), above which the MFM signal became dominated by thermal noises and non-magnetic residual interactions.
    Niniejsza praca dotyczy zastosowania metod korelacyjnych do numerycznej analizy obrazów rozkładu pola magnetycznego emitowanego z obszarów spontanicznego namagnesowania. W pracy przedstawiono kontynuację badań nad zastosowaniem funkcji autokorelacji oraz metod analizy fraktalnej w badaniach struktury domenowej oraz charakterystyki emitowanego z nich pola magnetycznego. Wyniki badań wykazują zależność mierzonej metodami mikroskopii sił magnetycznych (MFM) szerokości domen od wysokości skanowania nad badaną powierzchnią, sugerując przeprowadzanie serii pomiarów na różnych wysokościach (h), ich aproksymację z następną ekstrapolacją do powierzchni (h=0). Przeprowadzona analiza fraktalna, wskazuje na możliwość jej aplikacji do charakterystyki zmian sygnału magnetycznego rejestrowanego przez MFM. Pozwala ona również na wyznaczenie wysokości krytycznej (hkr), na której sygnałem dominującym stają się nakładające się na sygnał magnetyczny pozostałości niemagnetycznych interakcji między igłą sondy i badaną powierzchnią, stanowiące rejestrowany przez MFM szum.
    Źródło:
    Archives of Metallurgy and Materials; 2014, 59, 2; 451-457
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis on electromechanical coupling vibration characteristics of in-wheel motor in electric vehicles considering air gap eccentricity
    Autorzy:
    Li, Y.
    Wu, H.
    Xu, X.
    Cai, Y.
    Sun, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/200165.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    BLDC in-wheel motor
    rotor eccentricity
    unbalanced magnetic force
    electric vehicle
    electromechanical coupling vibrat
    Opis:
    The distortion of air gap magnetic field caused by the rotor eccentricity contributes to the electromechanical coupling vibration of the brushless DC (BLDC) permanent magnet in-wheel motor (PMIWM) in electric vehicles (EV). The comfort of the BLDC in-wheel motor drive (IWMD) EV is seriously affected. To deeply investigate the electromechanical coupling vibration of the PMIWM under air gap eccentricity, the PMIWM, tyre and road excitation are analyzed first. The influence of air gap eccentricity on air gap magnetic density is investigated. The coupling law of the air gap and the unbalanced magnetic force (UMF) is studied. The coupling characteristics of eccentricity rate, air gap magnetic density, UMF, phase current and vibration acceleration are verified on the test bench in the laboratory. The mechanism of the electro-mechanical coupling vibration of the BLDC PMIWM under air gap static eccentricity (SE), dynamic eccentricity (DE) and hybrid eccentricity (HE) is revealed. DE and HE deteriorate the vibration acceleration amplitude, which contributes the electromechanical coupling vibration of the PMIWM. The research results provide a solid foundation for the vibration and noise suppression of the PMIWM in distributed drive EV.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 5; 851-862
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact on force decrease at the end of actuator plunger motion
    Autorzy:
    Zagirnyak, M.
    Branspiz, Yu.
    Pshenychnyi, A.
    Miljavec, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/140870.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aktuator
    optymalizacja
    metoda elementów skończonych
    siła magnetyczna
    tłumik
    actuator
    geometry optimization
    finite element method
    magnetic force
    damper
    Opis:
    It is shown that decrease and damping of the traction force at the end of the plunger move is possible not only due to application of a special keeper design, but also due to change of the plunger shank geometric form. The computer modeling with the use of finite element method is used to analyze the influence of system geometry on force distribution along plunger movement. The damping effect is confirmed when special shape plunger shanks are used.
    Źródło:
    Archives of Electrical Engineering; 2011, 60, 2; 129-135
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Checkweigher using an EMFC weighing cell with magnetic springs and air-bearings
    Autorzy:
    Lee, Hyun-Ho
    Yoon, Kyung-Taek
    Choi, Young-Man
    Powiązania:
    https://bibliotekanauki.pl/articles/1849003.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    checkweigher
    magnetic spring
    electromagnetic force compensation
    Opis:
    A dynamic weighing system or a checkweigher is an automated inspection system that measures the weight of objects while transferring them between processes. In our previous study, we developed a new electromagnetic force compensation (EMFC) weighing cell using magnetic springs and air bearings. This weighing cell is free from flexure hinges which are vulnerable to shock and fatigue and also eliminates the resonance characteristics and implements a very low stiffness of only a few N/m due to the nature of the Halbach array magnetic spring. In this study, we implemented a checkweigher with the weighing cell including a loading and unloading conveyor to evaluate its dynamic weighing performances. The magnetic springs are optimized and re-designed to compensate for the weight of a weighing conveyor on the weighing cell. The checkweigher has a weighing repeatability of 23 mg (1σ) in static situation. Since there is no low-frequency resonance in our checkweigher that influences the dynamic weighing signal, we could measure the weight by using only a notch filter at high conveyor speeds. To determine the effective measurement time, a dynamic weighing process model is used. Finally, the proposed checkweigher meets Class XIII of OIML R51-1 of verification scale e 0.5 g at a conveyor speed of up to 2.7 m/s.
    Źródło:
    Metrology and Measurement Systems; 2021, 28, 3; 465-478
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Checkweigher using an EMFC weighing cell with magnetic springs and air-bearings
    Autorzy:
    Lee, Hyun-Ho
    Yoon, Kyung-Taek
    Choi, Young-Man
    Powiązania:
    https://bibliotekanauki.pl/articles/1849051.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    checkweigher
    magnetic spring
    electromagnetic force compensation
    Opis:
    A dynamic weighing system or a checkweigher is an automated inspection system that measures the weight of objects while transferring them between processes. In our previous study, we developed a new electromagnetic force compensation (EMFC) weighing cell using magnetic springs and air bearings. This weighing cell is free from flexure hinges which are vulnerable to shock and fatigue and also eliminates the resonance characteristics and implements a very low stiffness of only a few N/m due to the nature of the Halbach array magnetic spring. In this study, we implemented a checkweigher with the weighing cell including a loading and unloading conveyor to evaluate its dynamic weighing performances. The magnetic springs are optimized and re-designed to compensate for the weight of a weighing conveyor on the weighing cell. The checkweigher has a weighing repeatability of 23 mg (1σ) in static situation. Since there is no low-frequency resonance in our checkweigher that influences the dynamic weighing signal, we could measure the weight by using only a notch filter at high conveyor speeds. To determine the effective measurement time, a dynamic weighing process model is used. Finally, the proposed checkweigher meets Class XIII of OIML R51-1 of verification scale e 0.5 g at a conveyor speed of up to 2.7 m/s.
    Źródło:
    Metrology and Measurement Systems; 2021, 28, 3; 465-478
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Checkweigher using an EMFC weighing cell with magnetic springs and air-bearings
    Autorzy:
    Lee, Hyun-Ho
    Yoon, Kyung-Taek
    Choi, Young-Man
    Powiązania:
    https://bibliotekanauki.pl/articles/1849107.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    checkweigher
    magnetic spring
    electromagnetic force compensation
    Opis:
    A dynamic weighing system or a checkweigher is an automated inspection system that measures the weight of objects while transferring them between processes. In our previous study, we developed a new electromagnetic force compensation (EMFC) weighing cell using magnetic springs and air bearings. This weighing cell is free from flexure hinges which are vulnerable to shock and fatigue and also eliminates the resonance characteristics and implements a very low stiffness of only a few N/m due to the nature of the Halbach array magnetic spring. In this study, we implemented a checkweigher with the weighing cell including a loading and unloading conveyor to evaluate its dynamic weighing performances. The magnetic springs are optimized and re-designed to compensate for the weight of a weighing conveyor on the weighing cell. The checkweigher has a weighing repeatability of 23 mg (1σ) in static situation. Since there is no low-frequency resonance in our checkweigher that influences the dynamic weighing signal, we could measure the weight by using only a notch filter at high conveyor speeds. To determine the effective measurement time, a dynamic weighing process model is used. Finally, the proposed checkweigher meets Class XIII of OIML R51-1 of verification scale e 0.5 g at a conveyor speed of up to 2.7 m/s.
    Źródło:
    Metrology and Measurement Systems; 2021, 28, 3; 465-478
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of the remanence influence on the transient states in a single-phase multiwinding transformer
    Autorzy:
    Wilk, A.
    Michna, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/141451.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    single-phase transformer
    magnetic flux common
    magneto motive force
    magnetic hysteresis
    residual magnetic flux
    capacitor discharge test
    Opis:
    This paper presents the mathematical model of a single-phase multi-winding core type transformer taking into account magnetic hysteresis phenomenon based on the feedback Preisach model (FPM). The set of loop differential equations was developed for a K-th winding transformer model where the flux linkages of each winding includes flux Φ common to all windings as a function of magneto motive force Θ of all windings. The first purpose of this paper is to implement a hysteresis nonlinearity involved in the Φ(Θ) function which also accounts residual magnetic flux. The second purpose of this paper is experimental validation of the developed transformer model in a capacitor discharge test and several different values of residual magnetic flux.
    Źródło:
    Archives of Electrical Engineering; 2017, 66, 1; 41-54
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two theorems about Lorentz method for asymmetrical anisotropic regions
    Autorzy:
    Spałek, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/200154.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    asymmetrical magnetic anisotropy
    electromagnetic force and torque
    models of electromechanical converters for benchmarks
    Opis:
    The paper has dealt with two theoretical problems of calculation of electromagnetic force or torque. The first problem considers the magnetically anisotropic and conductive region. The theorem about equivalence of both Maxwell and Lorentz methods has been presented. The second problem deals with the independence from the integration surface of force or torque calculated by the Maxwell method. The second theorem which presents the sufficient condition for an independence problem in the anisotropic and nonconductive region has been formulated.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 2; 399-404
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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