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Numerical model of the axial magnetic bearing with six cylindrical poles

100%

Sikora B. M. , Pilat A. K.

tom Vol. 68, nr 1

195--208

The paper presents a numerical model of the novel design of the axial magnetic bearing with six cylindrical poles. The motivation behind this idea was to eliminate vibra- tions in rotating machinery due to the axial load. Common conception of such a bearing provides a single component of the electromagnetic force, which is not enough to reduce transverse and lateral vibrations of the armature. The proposed design allows for avoiding wobbling of the disc with the use of a few axial force components that are able to actively compensate the axial load and stabilise the disc in a balanced position. Before a real device is manufactured, a virtual prototype should be prepared. The accurate numerical model will provide essential knowledge about the performance of the axial magnetic bearing.

Research and Modeling of Mechanical Crosstalk in Linear Arrays of Ultrasonic Transducers

100%

Celmer M. , Opieliński K. J.

Analysis of Epstein frame by finite element method

72%

Németh Z. , Kuczmann M.

tom R. 95, nr 6

23--26

An Epstein frame has been built, which is used to measure magnetic properties of different kind of cores. Sinusoidal voltage excitation has been used in a frequency range of 1-400Hz. The measurements have been performed by a computer-controlled measurement system. The building and the measurement process have been published before. The objective of this work is to compare the simulation results performed with the COMSOL Multiphysics build-in modules and some potential formulation. For this work the Jiles-Atherton model has been chosen to prescribe hysteresis phenomena. The model parameters can be obtained by using the measurement results. The frame has been modelled in 2D.

W artykule zaprezentowano analizę systemu wykorzystującego platformę COMSOL Multiphysics. Użyto modelu Jiles-Atherton do opisu histerezy. Przeprowadzono analizę 2D wykorzystując parametry uzyskane doświadczalnie.