3D field analysis in 3-phase amorphous modular transformer under increased frequency operation

Tomczuk, B.; Koteras, Dariusz

doi:10.1515/aee-2015-0011

Cited by 8 publications

(3 citation statements)

References 5 publications

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“…The zero Dirichlet boundary condition was assumed on the outer surface of the simulation model, while the zero Neumann boundary condition was assumed on the symmetry plane. The nonlinear characteristic of the magnetic material included in the FEM was tested with a closed magnetic circuit [14]. The magnetic field distribution was solved with the magnetostatic solver that has implemented the T-Ω method.…”

Section: A Field-circuit Model Of the Hybrid Magnetic Bearingmentioning

confidence: 99%

Archive of Mechanical Engineering

Wajnert

2019

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A field-circuit model of the hybrid magnetic bearingThe paper presents a simulation model of the hybrid magnetic bearing dedicated to simulations of transient state. The proposed field-circuit model is composed of two components. The first part constitutes a set of ordinary differential equations that describes electrical circuits and mechanics. The second part of the simulation model consists of parameters such as magnetic forces, dynamic inductances and velocity-induced voltages obtained from the 3D finite element analysis. The MAT-LAB/Simulnik software was used to implement the simulation model with the required control system. The proposed field-circuit model was validated by comparison of time responses with the prototype of the hybrid magnetic bearing.

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Section: A Field-circuit Model Of the Hybrid Magnetic Bearingmentioning

confidence: 99%

Archive of Mechanical Engineering

Wajnert

2019

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“…In the case of paper [16], the authors present a method for determining power losses using a thermal imaging camera. For conventional transformers, in publication [17], the authors propose the use of 3D analysis in a high-frequency transformer. In publication [18], a numerical analysis of a push-pull transformer is presented.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of DC/DC electric vehicle charging system with conventional transformer and planar transformer

2024

Archives of Electrical Engineering

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This paper presents an analysis of electric vehicle charging station operation based on a dual active bridge topology. Two cases are considered: one with the use of a medium frequency planar transformer, the other with a conventional Litz winding transformer. An analysis was performed using both solutions in order to compare the performance characteristics of the system for both cases and to present the differences between each transformer solution. The analysis was based on tests carried out on the full-scale model of an electric vehicle charging station, which is the result of the project "Electric vehicle charging system integrated with lighting infrastructure" realized by the Department of Drives and Electrical Machines, Lublin University of Technology. The results presented in the paper show that the conventional transformer used in the research achieved better results than the planar transformer. Based on the results obtained, the validity of using both solutions in electric vehicle charging stations was considered.

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“…They affect the efficiency and temperature of the magnetic cores of electromagnetic (EM) devices. Thus, there is a need for minimization of the losses in ferromagnetic materials (Tomczuk et al, 2013). The classic way to reduce these losses lies in the lamination structure of these materials, where the metal sheets are as thin as possible.…”

Section: Introductionmentioning

confidence: 99%

The influence of the leg cutting on the core losses in the amorphous modular transformers

Tomczuk

Koteras

Waindok

2015

COMPEL

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Purpose -In a modular transformer with a wounded amorphous core, the authors should make some cutting to limit the eddy currents in its magnetic ribbon. The purpose of this paper is to deal with 3D magnetic field analysis, including the eddy currents induced by varying frequency of power. The influence of the core leg cutting on the power losses values, in the three variants of a one-phase modular transformer structure, has been presented. Design/methodology/approach -3D field problems including eddy currents of various frequency were analysed using the electrodynamic potentials and V within the finite element method. The wave method and iterative one of the laminated core homogenization, have been employed. The values of the calculated losses have been verified experimentally. Findings -The reduction of the core losses by axial cutting of the transformer legs is an efficient approach for the loss limitation. The wave method is not acceptable for homogenization of the amorphous core for its operation above 1 kHz. The iterative method is the better way to perform the homogenization. Research limitations/implications -Due to very thin (less than 50 μm) amorphous ribbon, the unhomogenization of the laminated magnetic core should be performed. Thus, the solid core with equivalent parameters has been assumed for the computer simulations. For the frequencies above 1 kHz, the iterative method should be used to determine the equivalent electrical conductivity of the solid substitute core. Originality/value -Using the wave method with the electrodynamic similarity laws and assuming the wave penetration depth, the equivalent electrical conductivity of the homogenized core, has been determined. This approach is valid for supply frequencies below 1 kHz. For the higher frequencies the authors had to use the iterative method. It seems to be valid for another cores with amorphous and nanocrystalic ribbons. For the modular amorphous core it is only way to calculate the losses in the solid geometry of the homogenized laminated magnetic circuit.

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3D field analysis in 3-phase amorphous modular transformer under increased frequency operation

Cited by 8 publications

References 5 publications

Archive of Mechanical Engineering

Archive of Mechanical Engineering

Comparative study of DC/DC electric vehicle charging system with conventional transformer and planar transformer

The influence of the leg cutting on the core losses in the amorphous modular transformers

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