Wyniki wyszukiwania - BazTech

1

Newly re-designed magnetic head for wire rope NDT

Miljavec D., Knez S.

Journal of Technical Physics

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2002

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Vol. 43, no 4

433-441

EN

The aim of the present paper is to analyse a newly re-designed magnetic head. Basic use of this head is in non-destructive testing (NDT) of wire ropes. The magnetic head system is composed of two main areas and three main parts. These areas are: magnetic flux leakage area in central region, and eddy current magnetic field area in outer side region of magnetic head. The analyses were carried out by analytic approach and by the finite element method. The value of induced voltage in flux leakage pick-up coils was calculated by axisymmetric 2D magnetostatic finite element analysis made by ferromagnetic rod to simulate the wire rope. Meanwhile, voltage induced by changes in eddy current magnetic field was calculated by a 2D transient linear motion finite element analysis. All numerically calculated results were compared with the measured ones on a geometrically similar ferromagnetic rod. Also, we have presented the measured results carried out by newly re-designed magnetic head on real steel wire rope with anomalies.

2

Interaction of saturation of magnetic circuits for the main and leakage fluxes in induction machines

Sobczyk T. J.

Journal of Technical Physics

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2002

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Vol. 43, no 4

475-481

EN

The paper presents a model of induction machines, in which saturation for both the main and leakage fluxes of individual windings is represented. The model operates with the real winding currents what gives a chance to model saturation of leakage magnetic circuits separately for each winding. The saturation of the main magnetic circuit is modelled by introducing a magnetising current denned analytically by all machine currents. Such a model allows to study the interaction of saturation of separately treated magnetic circuits of the main and leakage fluxes. Remarkable results of simulations are shown in the paper.

3

Calculation of linear induction motor performance using finite element method

Bugeza M., Fiser R., Ferkolj S.

Journal of Technical Physics

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2002

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Vol. 43, no 4

369-375

EN

The paper presents the calculation of a linear induction motor steady-state and dynamic characteristics using the finite element method. The 2D nonlinear eddy-current solver was used for magnetic field and force calculations. Quantities like magnetic vector potential, flux density, force components, primary and secondary currents, mutual and leakage inductance, can be determined very precisely. The detailed insight in magnetic field distribution of a linear induction motor forms the basis for evaluation of its operational behaviour. The results obtained by the finite element method are further used in the process of the mathematical modelling and control simulation based on the space vector theory.

4

Inspekcja tłokiem kalibrującym gazociągu wysokiego ciśnienia DN 700 Podlasie – Wronów

Witek M.

Nowoczesne Gazownictwo

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1998

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nr 1

26--32

PL

Celem artykułu jest omówienie przygotowań do badania stanu technicznego rurociągu przy pomocy tłoka inteligentnego metodą rozproszenia magnetycznego oraz przedstawienie wyników inspekcji tłokiem kalibrującym gazociągu wysokiego ciśnienia DN 700 Podlasie - Wronów, którą wykonano w 1997 r. pod nadzorem MOZG Rejonu Sieci Przesyłowej i Tranzytowej.