Electrical engineering

20150506-03
Derivation and analysis of ceramic materials based on BaTiO3 by using standard ceramic technology
Valentin Kolev, Anka Zeglova, Ivailo Lazarov

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Ceramic materials based on BaTiO3 have been derived by using a standard ceramic technology. Various quantities of H3BO3 and Bi3O3 have been added in order to lower the ...  read more

20150506-02
Optimally designed energy efficient transformer using global iterative algorithms
Mihail Digalovski, Goran Rafajlovski, Krste Najdenkoski

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The reduction of total losses for transformers is of great importance both from economic and environmental aspects. In the paper two optimization techniques, Global Search and Pattern Search, to minimize the total power losses ...  read more

20150506-01
Analytical approach for calculation of the electric field induced by an axisymmetric current exciter
Ilonka T. Lilyanova

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In the paper is presented an analytical approach for calculation of the electric field induced by an axisymmetric current exciter. The region in which the field is determined may have an arbitrary shape. The approach is based ...  read more

20150708-07
Modeling of electromagnetic and thermal processes occurring in induction heating cooker
Maik Streblau

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Induction heating is a famous technology and very usually used for cooking appliances because of its high-energy efficiency. A mathematical model is adopted for a flat inductor-detail system in this paper and it is used for ...  read more

20151112-08
Study of power fluctuations and their compensation in a hybrid system with renewable energy sources
Hristiyan Kanchev, Bruno François, Zahari Zarkov, Ludmil Stoyanov, Vladimir Lazarov

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This paper deals with the combined influence of photovoltaic and different wind energy potentials and respectively the produced energy on the operation of an autonomous hybrid system. The studied system comprises a PV generator, ...  read more

20151112-07
Analysis of the torque ripple of permanent magnet synchronous motors with inset and embedded magnets
George Todorov

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This paper analyzes with magnetic field distribution and torque ripple of Permanent Magnet Synchronous Motors (PMSM) with inset and embedded magnets. An analytical model of the motor has been developed. The model uses iterative ...  read more

20160708-07
Advantages and applications of nanocrystalline magnetic materials
Vencislav Valchev

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This paper presents current stage and future trends of magnetic properties, advantages and applications of nanocrystalline magnetic materials in electronics. The advanced magnetic properties of the material are discussed and ...  read more

20160708-06
A model of a three-phase disk type synchronous generator with rare earth magnets
Nikola Georgiev

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This paper makes a study of a three-phase disk type synchronous 8 pair-pole generator with axial magnetic field and rare earth magnets. The generator consists of one rotor with sixteen rare earth magnets and two stators with ...  read more

20160708-05
Study of combined heating and power generation as distributed energy resource
Hristiyan Kanchev, Nikolay Hinov

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This paper presents a study on the possibilities for implementation of local cogeneration and trigeneration (heating, air-conditioning and electricity generation) as distributed energy resource. By the means of microturbine-based ...  read more

20160910-06
Adaptive vector control of permanent magnet synchronous motor
Emil Marinov, Tsvetomir Todorov, Zhivko Zhekov, Nikolay Petkov

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It is considered in this paper an opportunity to develop a permanent magnet synchronous motor (PMSM) vector control system with desired quality. A model reference adaptive control (MRAC) system based on hyper-stability theory ...  read more