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prof. Ing. Václav Havlíček, CSc.

All publications

Dynamic Hysteresis Loops Modelling by Means of Extended Hyperbolic Model

  • DOI: 10.1109/TMAG.2012.2218584
  • Link: https://doi.org/10.1109/TMAG.2012.2218584
  • Department: Department of Electric Drives and Traction, Department of Circuit Theory
  • Annotation:
    Modelling of dynamic hysteresis loops of soft magnetic materials is carried out by extended hyperbolic model. The extension is based on pure phenomenological approach and consists in elliptical component addition. This component features rounded shapes of dynamic hysteresis loops at low intensities of magnetization and it needs two parameters only. Fitting parameters for each loop are searched individually, and their dependences are then approximated by rational functions. The final model operates with approximated parameters. Proposed model was tested for the material FeNi47Cu5 at sinusoidal excitation at frequency 50 Hz.

Software for Magnetic Flux Density Waveform Correction Systems

  • Department: Department of Circuit Theory
  • Annotation:
    The magnetic flux density of defined waveform is an important magnetizing condition for AC soft magnetic material measurements declared by the International Material Standard. Due to strong non-linearity of magnetic materials, magnetic flux dispersion and non-zero resistance of the magnetizing winding, the magnetic flux density waveforms are distorted at high intensities of magnetizing. This waveform distortion must be corrected by special PC (or microprocessor) controlled correctiuon systems. New correction algorithms and software for developed correction systems are presented.

Software for Magnetic Flux Density Waveform Correction Systems

  • Authors: Zemánek, I., prof. Ing. Václav Havlíček, CSc., Havránek, A.
  • Publication: Magnetic Measurements 2012. Bratislava: Slovak University of Technology, 2012. pp. 12. ISBN 978-80-227-3770-8.
  • Year: 2012
  • Department: Department of Circuit Theory
  • Annotation:
    The magnetic flux density of defined waveform is an important magnetizing condition for AC soft magnetic material measurements declared by the International Material Standard. Due to strong non-linearity of magnetic materials, magnetic flux dispersion and non-zero resistance of the magnetizing winding, the magnetic flux density waveforms are distorted at high intensities of magnetizing. This waveform distortion must be corrected by special PC (or microprocessor) controlled correctiuon systems. New correction algorithms and software for developed correction systems are presented.

Electrical Circuits 2

  • Department: Department of Circuit Theory
  • Annotation:
    The book is the 2nd portion of the two-part monograph. Its concept is based on the system approach to the signal processing. It deals with the LTI circuits and systems analysis. The first chapter is devoted to the time domain 1st and 2nd basic transient analysis. Different signal transformations making different linear circuit working modes analysis easier are defined in next chapters. The periodical non-sinusoidal steady state analysis and operational transient one are described, and different types of transient (time) responses and frequency ones defined. Next sections deal with multi-terminal circuit analysis and distributed parameters circuits analysis. The final section is the discrete signals and systems theory introduction. The book is dedicated to students of electrotechnical and information study programs, engineers in practice, pedagogues and technicists dealing with development, realization and operation of electrical and electronic circuits including discrete systems.

Universal control and measuring system for modern classic and amorphous magnetic materials single/on-line strip tester

  • Authors: Zemánek, I., prof. Ing. Václav Havlíček, CSc.,
  • Publication: Journal of Magnetism and Magnetic Materials. 2006, 2006(304 / 2), e577-e579. ISSN 0304-8853.
  • Year: 2006
  • Department: Department of Circuit Theory
  • Annotation:
    Universal control and measuring system was developed for modern classic and amorphous magnetic materials single/on-line strip tester. The system gives possibility to measure magnetization characteristic and specific power losses of measured materials at arbitrary waveform AC magnetization at frequencies 20 Hz - 20 kHz.

Accuracy of Power Losses Measurement at AC Magnetization

  • Authors: prof. Ing. Václav Havlíček, CSc.,
  • Publication: Proceedings of Measurement 2005 5th International Conference on Measurement. Bratislava: Institute of Measurement Science of the SAS, 2005, pp. 522-525. ISBN 80-967402-8-8.
  • Year: 2005
  • Department: Department of Circuit Theory
  • Annotation:
    The paper deals with problems of industrial AC measurement of magnetic properties of steel sheets and strips.

Electrical Circuits 1

  • Department: Department of Circuit Theory
  • Annotation:
    The book is the 1st portion of the two-part monograph. The basic terms of circuit theory, circuit quantities and circuit elements are defined in chapters 1, 2 and 3. The elementary analysis of linear and non-linear resistive circuits is described in chapter 4, principals of the sinusoidal steady state analysis in linear one-phase and three-phase circuits are in chapter 5, and general analysis methods of the sinusoidal steady state are described in final chapter 6. The book is dedicated to students of electrotechnical and information study programs, engineers in practice, pedagogues and technicists dealing with development, realization and operation of electrical and electronic circuits and equipments.

Power Losses Measurement in Three-Phase Transformer Core

Developent of Parametres of Study Efectivity CVUT in 2004 - 2008

Higher Frequency Magnetic Single Sheet Tester

Measurement of Three-phase Transformer Core Magnetic Properties

Single Phase Measurement of Three-Phase Transformer Core Power Losses

Transformation of Classical 5 Years Electrical Engineering Curricula to 3-5-8 Structured Curriculum

  • Authors: prof. Ing. Václav Havlíček, CSc.,
  • Publication: Proceedings of the 15th EAEEIE Annual Conference on Innovation in Education for Electrical and Information Engineering (EIE). Nancy: EAEEIE, 2004. pp. 119-122. ISBN 954-9518-22-1.
  • Year: 2004

Increasing of AC Compensation Method Accuracy

Measurement of Power Losses at AC Magnetization

Measurement of Power Losses at AC Magnetization

AC Magnetic Measurement Accuracy

New Concepts of Compensated Single Strip Tester

New Concepts of Compensated Single Strip Tester

Increasing of AC Compensation Method Accuracy

Analysis of the Electrical Engineering Problem Using Computer Tools

Improvement of AC Compensation Method Accuracy

Key Elements in Effective E-Learning - Examples in Engineering Education

  • Authors: Latchman, H., prof. Ing. Václav Havlíček, CSc.,
  • Publication: ICEE 2000, International Conference on Engineering Education. Taipei: National Science Council, 2000. ISSN 1562-3580.
  • Year: 2000

On-Line AC Magnetic Measurement at Higher Velocities of Strip Movement

The MATLAB Environment for Circuit Theory Teaching

Czech Technical University-Quality Assessment and Information System

  • Authors: prof. Ing. Václav Havlíček, CSc.,
  • Publication: Enhancement of Education in Electrical and Information Engineering through Industry Co-operation and Research. Nancy: European Association EAEEIE, 1998, pp. 13-16. ISBN 972-97738-0-7.
  • Year: 1998

On-line AC Magnetic Measurements at Higher Velocities of Strip Movement

Increasing of AC Magnetic Measurements Accuracy

The Educational Process Quality Assessment and Improvement in the Czech Technical University

Accuracy of Digital Power Losses Measurement

  • Authors: prof. Ing. Václav Havlíček, CSc., Ben Dakhlia, C.
  • Publication: Interdisciplinary Applied Electromagnetics. Brno: Czech Society of Applied Electromagnetics, 1996. pp. 222-229.
  • Year: 1996

Integrated Information System of the Czech Technical University in Prague

Accuracy of Digital Power Loss Measurement

  • Authors: Ben Dakhlia, C., prof. Ing. Václav Havlíček, CSc.,
  • Publication: The Third Japanese-Czech-Slovak Joint Seminar on Applied Electromagnetics. Praha: České vysoké učení technické v Praze, 1995. pp. 117-120.
  • Year: 1995

Computer Controlled Compensation Ferrometr KF7

Industrial Methods of Magnetic Properties Testing

  • Authors: prof. Ing. Václav Havlíček, CSc.,
  • Publication: The Technology Transfer in Electrical and Information Engineering. Bologna: University of Bologna, 1995. pp. 46-52.
  • Year: 1995

Noninductive Shunts for Electronic Power Measurements

  • Authors: prof. Ing. Václav Havlíček, CSc.,
  • Publication: 8th International Symposium on Theoretical Electrical Engineering. Thessaloniki: Aristotle University of Thessaloniki, 1995. pp. 333-336.
  • Year: 1995

Teaching of Electrical Engineering Courses in English in CTU Prague

MMF Compensation Accuracy

MMF Compensation Circuit Accuracy

On-line AC Magnetic Measurements Accuracy

  • Authors: prof. Ing. Václav Havlíček, CSc., Zemánek, I.
  • Publication: SMM-11 Soft Magnetic Materials. Conference Abstracts. Bologna: Avenue Media, 1994. pp. 4-11.
  • Year: 1994

On-line AC Magnetic Measurements Accuracy

Sampling Method of Power Loss Measurement

Computer-Controlled AC Magnetic Measuring System

Turbotutor-Program System for Circuit Theory Education

DIGITALLY CONTROLLED SINGLE SHEET TESTER

  • DOI: 10.1016/0304-8853(92)91124-C
  • Link: https://doi.org/10.1016/0304-8853(92)91124-C
  • Department: Department of Circuit Theory
  • Annotation:
    The Czechoslovak compensation method facilitates the construction of SSTs for ac magnetic measurements. The theoretical solution and practical results show that the symmetrical double yoke is necessary to exclude the influence of additional eddy currents. The microcomputer control of the SST at ac magnetization needs using of a numerical iteration method to set required working points. The modified regula-falsi method seems to be the best one.

ONLINE TESTING DEVICE USING THE COMPENSATION METHOD

COMPARISON OF LOSS MEASUREMENTS ON SHEETS AND STRIPS

  • Authors: Mikulec, M., prof. Ing. Václav Havlíček, CSc., Wiglasz, V., Cech, D.
  • Publication: Journal of Magnetism and Magnetic Materials. 1984, 41(1-3), 223-226. ISSN 0304-8853.
  • Year: 1984

Responsible person Ing. Mgr. Radovan Suk