Modele charakterystyk materiałów magnetycznie miękkich stosowanych w budowie czujników

• Autorzy: Szewczyk R.

Warianty tytułu

EN

Models of characteristics of soft magnetic materials for sensor applications

• Języki publikacji: PL

Abstrakty

PL

W pracy przedstawiono nowe modele właściwości materiałów magnetycznie miękkich, wykorzystujące model Jilesa-Athertona-Sablika. Autor zaproponował także nowy opis zmian średniej energii koniecznej do pokonania zaczepu ściany domenowej oraz przedstawił proces dwuetapowej optymalizacji, która umożliwia wyznaczenie parametrów opracowanych modeli. Praca zawiera także przegląd znanych modeli, umożliwiających powiązanie wybranych właściwości fizycznych magnetyka z jego charakterystykami magneto-mechanicznymi, ważnymi z technicznego punktu widzenia. Weryfikacja przedstawionych w pracy nowych modeli procesu magnesowania materiałów magnetycznie miękkich została przeprowadzona w odniesieniu do uzyskanych na drodze eksperymentalnej charakterystyk magnetyków, zróżnicowanych zarówno ze względu na średnią energię, anizotropii materiału, wartość współczynnika magnetostrykcji nasycenia materiału, jak i strukturę materiałów. W przypadku pętli histerezy magnetycznej B(H) oraz zależności przenikalności amplitudowej od wartości pola magnesującego μa(H) stwierdzono zgodność kształtu charakterystyk oraz wartości modelowych z danymi eksperymentalnymi, zarówno w odniesieniu do materiałów izotropowych, jak i anizotropowych. Zastosowanie przedstawionego w pracy opisu dynamicznego procesu magnesowania umożliwiło także uzyskanie zgodności wyników modelowania z wynikami badań eksperymentalnych. Jakość opracowanego modelu została potwierdzona parametrami statystycznymi. Badania w zakresie modelowania wpływu temperatury na charakterystyki magnetyczne anizotropowego stopu o składzie [Fe40Ni38Mo4B18] przeprowadzono w temperaturach, w których najczęściej pracują urządzenia powszechnego użytku. Także w przypadku charakterystyk temperaturowych zaobserwowano zgodność wyników modelowania z danymi eksperymentalnymi, co potwierdzono parametrami statystycznymi. Weryfikacje, opisu modelowego wpływu naprężeń wywołanych silami zewnętrznymi na charakterystyki magnetyczne stopu o składzie [Fe40Ni38Mo4B18] zrealizowano w odniesieniu zarówno do charakterystyk B(H)σ, jak i B(σ)Hm. Charakterystyki te determinują charakterystyki przetwarzania magneto-mechanicznych czujników, wykorzystujących efekt magnetosprężysty i dlatego są szczególnie ważne z punktu widzenia modelowania właściwości użytkowych tych czujników. W odniesieniu do charakterystyk B(H)σ wartość współczynnika determinacji R2 przekracza 0,99, przy wszystkich wartościach naprężeń ściskających σ w przedziale od 0 do 10 MPa. Przedstawione w pracy modele charakterystyk magneto-mechanicznych czujników do pomiaru siły oraz czujników transduktorowych do pomiaru stałego pola magnetycznego mogą być wykorzystane do celów technicznych. Opracowany model czujnika magnetosprężystego i czujnika transduktorowego umożliwia wyznaczenie optymalnych wartości częstotliwości [f] i amplitudy Hm pola magnesującego rdzeni z materiału magnetycznie miękkiego. Prezentowane w pracy wyniki modelowania funkcjonalnych charakterystyk czujników magnetosprężystych i transduktorowych nie były do tej pory opisane w literaturze. Przedstawiony przez autora nowy model charakterystyk magnesowania materiałów magnetycznie miękkich umożliwia techniczne zastosowanie tego typu modelowania w konstrukcji czujników magneto-mechanicznych.

EN

The dissertation presents new models of properties of soft magnetic materials. These models are based on the Jiles-Atherton-Sablik model of the magnetization process. A description of the optimization process, which allows to determine the parameters of the model, is also provided. A review of the most important models connecting physical properties of soft magnetic materials with their magneto-mechanical characteristics has also been included. Experimental verification of the presented models of the magnetization process of soft magnetic materials was performed for characteristics of diverse materials with regard to their anisotropy energy, saturation magnetostriction as well as structure. A high level of correspondence between the experimental results and the results of modelling was achieved for magnetic hysteresis loops B(H) and magnetic field dependences of permeability μa(H). This good conformity was indicated for both isotropic and anisotropic magnetic materials. Verification of modelling of the dynamic hysteresis loop also indicated a high level of conformity between experimental and modelling results. The accordance was quantitatively confirmed by statistical analyses. A study of modelling of temperature dependence of the [Fe40Ni38Mo4B18] amorphous alloy magnetization process was performed in the temperature range typically used for technical operations. Also in this case, a high level of conformity between experimental results and the results of modelling was achieved. Verification of the magnetoelastic characteristics model of [Fe40Ni38Mo4B18] amorphous alloy was carried out both for B(H)σ and B(σ)H characteristics. These characteristics are particularly important due to the fact that they determine functional characteristics of the magneto-mechanical sensors utilizing magnetoelastic effect. For B(H)σ characteristics, the coefficient of determination R2 exceeds 0.99, for all applied stress in the range from 0 to 10 MPa. The presented models of the characteristics of magneto-mechanical force sensors and magnetic fields fluxgate sensors confirmed the applicability of this modelling methodology for technical purposes. The presented model of the magnetoelastic force sensor, as well as the fluxgate sensor allows to calculate optimal values for magnetizing field amplitude of the core, as well as its frequency. Such results were not presented in literature hitherto, due to the lack of an accurate magnetization process description. The magnetization process description presented in this dissertation bridges this gap and allows to apply the soft magnetic materials magnetization process description in the development of sensors.

Słowa kluczowe

PL

materiały magnetycznie miękkie; modelowanie charakterystyk magnetycznych; czujniki magnetosprężyste

EN

soft magnetic materials; modelling of magnetic characteristics; magnetoelastic sensors

• Wydawca: Oficyna Wydawnicza Politechniki Warszawskiej
• Czasopismo: Prace Naukowe Politechniki Warszawskiej. Mechanika
• Rocznik: 2009
• Tom: z. 224
• Strony: 3--85
• Opis fizyczny: Bibliogr. 220 poz., rys., tab.

Twórcy

autor

Szewczyk R.

• Instytut Metrologii i Inżynierii Biomedycznej,

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