Sergey Zirka - Academia.edu (original) (raw)

Papers by Sergey Zirka

IEE Proceedings - Science, Measurement and Technology, 2002

ABSTRACT

Spin current generator based on topological insulator coupled to ferromagnetic insulators AIP Adv... more Spin current generator based on topological insulator coupled to ferromagnetic insulators AIP Advances 2, 032162 (2012) Tailoring the FeRh magnetostructural response with Au diffusion J. Appl. Phys. 112, 043512 (2012) Miniaturized terrestrial digital media broadcasting antenna based on low loss magneto-dielectric materials for mobile handset applications J. Appl. Phys. 112, 043915 (2012) Information-signal-transfer rate and energy loss in coupled vortex-state networks Appl. Phys. Lett. 101, 092403 (2012) Magnetic viscosity, hysteresis reptation, and their relationship with adjacent track interference in advanced perpendicular recording media J. Appl. Phys. 112, 043911 (2012) Additional information on J. Appl. Phys. Journal Homepage: http://jap.aip.org/ Journal Information: http://jap.aip.org/about/about_the_journal Top downloads: http://jap.aip.org/features/most_downloaded The physical assumptions underlying the static and dynamic Jiles-Atherton (JA) hysteresis models are critically analyzed. It is shown that the energy-balance method used in deriving these models is actually closer to a balance of coenergies, thereby depriving the resulting JA phenomenology of physical meaning. The non-physical basis of its dynamic extension is demonstrated by a sharp contrast between hysteresis loops predicted by the model and those measured for grain-oriented steel under conditions of controlled sinusoidal flux density at frequencies of 50, 100, and 200 Hz.

—History-dependent and history-independent models of magnetic hysteresis are proposed. Spline app... more —History-dependent and history-independent models of magnetic hysteresis are proposed. Spline approximations to the magnetization curves make these models applicable to major loops of any shape. The representation of reversal curves permits the development of a method that generates reversal curves guaranteed to be free from nonphysical negative slopes and excursions outside the major loop. The applicability of the models to electrical steels and a powder core is illustrated.

—A method is proposed to account for the influence of the tank walls in the topological transient... more —A method is proposed to account for the influence of the tank walls in the topological transient model of a three-phase, three-limb core-type transformer. The influence of the transformer tank walls as a distributed-parameter hysteretic element is reproduced by solving a diffusion equation that describes the penetration of the plane electromagnetic wave into the depth of the wall. The reliability of the model is validated by comparing its zero-sequence impedances to those measured on a 25-MVA transformer, in the presence and absence of a tertiary stabilizing winding. An Electromagnetic Transients Program–Alternate Transients Program implementation of the model is outlined.

We have studied the ability of two one-dimensional (1-D) time-stepping models, both based on the ... more We have studied the ability of two one-dimensional (1-D) time-stepping models, both based on the concept of magnetic viscosity, to reproduce dynamic loops and losses in grain-oriented (GO) electrical steels under arbitrary magnetization regimes. We found that GO steels (0.3 mm thick) can be modeled quite accurately at magnetizing frequencies up to 200 Hz by a thin sheet representation, which is applied to a bulk material. At higher frequencies, acceptable results can be obtained through a finite-difference solver of a 1-D penetration equation whose applicability to GO steels can be explained in terms of domain wall bowing. Because of the inertial effect introduced by the magnetic viscosity, the average error in the loss prediction is reduced from 40% for the conventional classical method to 5% for the methods we studied. We demonstrated the accuracy of the models using two GO steels whose losses and – characteristics were measured by computer-controlled Epstein and single-sheet testers.

Russian Electrical Engineering, 2013

Journal of Applied Physics, 2014

ABSTRACT The usual skin effect observed in magnetically linear medium (μ = const.) is absent in a... more ABSTRACT The usual skin effect observed in magnetically linear medium (μ = const.) is absent in a magnetically non-linear medium, leading to wrong predictions of the eddy current field using the classical approach. For this reason, this paper proposes a thin sheet model, improving the eddy current field description on the basis of physical ideas in the framework of the saturation wave model, which describes the dynamic magnetization of the material with rectangular hysteresis loop. Therewith, the layer-to-layer nature of the magnetization reversal is taken into account. The hysteresis is modeled by means of a static history-dependent hysteresis model. This leads to a simplified model of conducting ferromagnetic sheet, which describes magnetization of isotropic electrical steels.

IEEE Transactions on Power Delivery, 2016

Priborostroenie, 1977

A method has been developed for reducing the pulse-peak nonuniformity in a pulse converter by int... more A method has been developed for reducing the pulse-peak nonuniformity in a pulse converter by introducing an additional capacitor into the correcting two-pole network. This makes it possible to create an approximately rectangular pulse. Two methods of correction - corresponding to methods of connection of the RLC two-pole network into the converter circuit - are described: connection of the network between the pulse generator and converter and connection of the network in series with the load resistance element. A computer technique for computing correction parameters is described.

IEEE Transactions on Power Delivery, 2015

ABSTRACT The main features of the history-dependent inverse model of magnetic hysteresis are outl... more ABSTRACT The main features of the history-dependent inverse model of magnetic hysteresis are outlined. Its implementation into the Electromagnetic Transient Program–Alternative Transients Program (EMTP-ATP) is described, and the fitting of the model to catalog data is demonstrated. The abilities of the model are illustrated by its use in a single-phase transformer model.

Lecture Notes in Computational Science and Engineering, 2001

ABSTRACT We deal with the numerical approximation of a parabolic boundary value problem (BVP) wit... more ABSTRACT We deal with the numerical approximation of a parabolic boundary value problem (BVP) with Neumann boundary conditions arising from the evaluation of transients in conducting ferromagnetic cores. This BVP is derived from the proper Maxwell equations. A nonstandard finite-difference (FD) technique is compared with a standard finite element (FE) formulation. For nonlinear problems, characterized by abrupt changes in the magnetic permeability, being the material coefficient in the BVP, the second-order FD-scheme is recommended.

IEEE International Magnetics Conference, 1999

INTERMAG 2006 - IEEE International Magnetics Conference, 2006

This paper shows how measurements on high silicon steel under sinusoidal flux density are used to... more This paper shows how measurements on high silicon steel under sinusoidal flux density are used to help develop basic numerical models which are able to predict the material behaviour under arbitrary magnetization conditions.

IEEE Transactions on Magnetics, 2005

We describe an accommodation hysteresis model based on a combination of history-dependent and his... more We describe an accommodation hysteresis model based on a combination of history-dependent and history-independent models. The amount of accommodation is changed by varying the weights of the models employed in the resulting model. We illustrate the operation of the proposed model with accommodating cycles attached to the major loop. The model can be useful in further investigations of the accommodation

Physica B: Condensed Matter, 2004

A viscous-type dynamic hysteresis model (DHM) is developed. The DHM is compatible with static und... more A viscous-type dynamic hysteresis model (DHM) is developed. The DHM is compatible with static underlying model of any type and nature (Preisach or non-Preisach). The distinguishing features of the DHM are its arbitrary frequency dependence and the ability to control the shape of the dynamic hysteresis loop. The numerical method for the incorporation of the DHM in magnetodynamic computations is illustrated by a good agreement of modelled dynamic loops with measured loops of non-oriented and grain-oriented electrical steels. r

Physica B: Condensed Matter, 2004

A numerical study of the Dynamic Preisach model of Bertotti (DPM-B) is carried out in time domain... more A numerical study of the Dynamic Preisach model of Bertotti (DPM-B) is carried out in time domain and over an unlimited range of magnetise fields and frequencies. It is shown that the well-known approximation of the total loss simulated by the DPM-B by the expression C0+C1sqrt(f) is a low-frequency limit of a more complex dependence characterised by a faster growth of the excess loss component. The anomalous temporal and frequency behaviour of the DPM-B is revealed by comparing the DPM-B to a recently proposed dynamic hysteresis model, which is compatible with static hysteresis models of any type and provides a desirable excess loss dependence invariable in all frequency range. In such a way, it is shown that the applicability of the phenomenological DPM-B and its modification is constrained to the low frequencies and steady-state periodic regimes.

Journal of Magnetism and Magnetic Materials, 2008

Results of numerical analysis of loss components in a conducting magnetic hysteresis medium are g... more Results of numerical analysis of loss components in a conducting magnetic hysteresis medium are given. They explain inaccuracies of the widespread formula for the total loss evaluation and provide a basis for an engineering approach to loss prediction over a wide range of magnetization frequencies and flux densities.

Journal of Magnetism and Magnetic Materials, 2008

The loss predictive methods based on the static and dynamic components of power loss are compared... more The loss predictive methods based on the static and dynamic components of power loss are compared with the methods where the total loss is subdivided into hysteresis, classical and excess components. It is explained why the simplest two-component methods can be preferable. An approach to the characterization of a given steel is outlined.

IEE Proceedings - Science, Measurement and Technology, 2002

ABSTRACT

Russian Electrical Engineering, 2013

Journal of Applied Physics, 2014

IEEE Transactions on Power Delivery, 2016

Priborostroenie, 1977

IEEE Transactions on Power Delivery, 2015

Lecture Notes in Computational Science and Engineering, 2001

IEEE International Magnetics Conference, 1999

INTERMAG 2006 - IEEE International Magnetics Conference, 2006

IEEE Transactions on Magnetics, 2005

Physica B: Condensed Matter, 2004

Journal of Magnetism and Magnetic Materials, 2008

This paper describes an experience in transformer modeling based on open-circuit test data obtai... more This paper describes an experience in transformer
modeling based on open-circuit test data obtained for a wide
range of terminal voltages and inrush current measurements that
were carried out for different residual fluxes of a 300 kVA
transformer. The core type transformer model is based on a
dynamic hysteresis model which is employed individually in the
legs and yokes. We start with the case where the core geometry
and winding turns are known when fitting the model. The
method proposed is then extended to the case where only the
nameplate data and the measured no-load losses and currents are
available. For this latter case, an optimization model fitting is
developed.