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3D magnetic and thermal fields for in the transformer with homogenised amorphous C-core under high frequency

Tomczuk B., Koteras D.

Przegląd Elektrotechniczny

2017

R. 93, nr 6

9--12

In this paper, calculations of magnetic field, including eddy currents phenomenon and thermal field in the 1-phase modular amorphous transformer (C-core) under f =1 kHz frequency supplying, were carried out. Using analytical and iterative methods the equivalent electrical conductivity of the core, has been obtained. 3D field problems were analysed using the electrodynamic potentials within the finite element method (FEM). The selected thermal models have been verified experimentally.

W niniejszej pracy analizowano rozkłady pola magnetycznego, z uwzględnieniem zjawiska prądów wirowych i pól temperaturowych w 1-fazowym amorficznym transformatorze modułowym (z rdzeniem typu C) przy zasilaniu napięciem o częstotliwości f= 1 kHz. Do wyznaczenia zastępczej przewodności elektrycznej rdzenia wykorzystano metody: iteracyjną oraz analityczną. Trójwymiarowe zagadnienia analizowano z wykorzystaniem potencjałów elektrodynamicznych zaimplementowanych w metodzie MES. Wybrane modele termiczne weryfikowano pomiarowo.

Comparison of 2D and 3D FEM analysis of the magnetic field in a PM servo motor

Deeb R., Janda M., Makki Z.

Poznan University of Technology Academic Journals. Electrical Engineering

2012

No. 72

297--309

Nowadays, the applications of the electrical machines with permanent magnets become very common, because of the outstanding properties of these devices in comparison with the induction machines. PM machines do not indicate electrical losses with the field excitation, which means increasing of their efficiency. This is a very important factor considering the urgent need of the energy conservation. Although, numerical methods for a field computation are time consuming, they provide accurate results without making any simplification of the geometry. The paper presents a comparison of 2D and 3D magnetic analysis of a PM servo motor. The analyzed servo motor is designed with a surface magnet rotor and produced by the VUES Brno company. The applied PM material is of rare earth type NdFeB. This material is characterized by a very high energy product. 2D model of this servo motor is created using AutoCAD program. The 2D magnetic analysis is computed using FEMM (finite element method magnetics). The 3D magnetic analysis is computed using a modem technique in the field of magnetic analysis of electrical machines. 3D model of the servo motor is generated using RMxprt program. The 3D magnetic analysis of the generated 3D model is computed using Maxwell 3D program. The program Maxwell 3D generates fine mesh automatically with a high accuracy. The distribution of the magnetic field inside the servo motor is computed for the case of the nominal current in both of 2D and 3D magnetic analysis. The distribution of the magnetic flux density according to the air gap length is presented too. The FEM (finite element method) is used for both 2D and 3D magnetic analysis of this servo motor.