Abstract
At engineering simulations of magnetic fields in ferromagnetic cores standard Preisach and Jiles-Atherton models are commonly used. At that a material magnetic properties are considered similar in all points of a core. However, the view of experimental hysteresis loops can differ from calculated even for materials with well-known magnetic properties, e.g. transformer steel. Experimental registration of hysteresis loops in characteristic zones of laminated steel core have revealed substantial discrepancy as in the loops view as in the field strength distribution in comparison with calculation results. Measurements at the frequency and field amplitude variation in order to reveal their influence on the magnetization process are conducted. The results obtained point to possible significant influence of magnetostriction effect on functioning of the ferromagnetic core. This influence can appear at frequencies of the core mechanical resonance and lead to changes in the core inductance and quality factor. The effect is relatively weakly pronounced at laminated steel core, but in some cases needs to be considered, e.g. if big size core operates at network frequency.
Highlights
Engineering simulations of magnetic fields in ferromagnetics are of importance for magnetic cores [1, 2, 3], technology
The important factor influencing on the magnetic properties is mechanical stress [8], which can be generated by magnetic pressure or magnetostriction
It is known that magnetostriction effect can cause vibration, noise leading to mechanical troubles in power equipment [20, 21, 22] The presented results point to possible significant influence of magnetostriction effect on electromagnetic parameters of the ferromagnetic core
Summary
Engineering simulations of magnetic fields in ferromagnetics are of importance for magnetic cores [1, 2, 3], technology (e.g. non-destructive testing [3, 4, 5, 6]). The magnetic properties are considered similar in all points of the core. Material models used for FEM computer simulations connect magnetic flux density and field strength at a point. The important factor influencing on the magnetic properties is mechanical stress [8], which can be generated by magnetic pressure or (and) magnetostriction. The integral parameters of the coil are analysed with respect of the core mechanical frequency and field strength
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