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Ing. Miroslav Lev

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Permanent Magnet Synchronous Machine Parameters Identification for Load Characteristics Calculation.

  • Authors: Čeřovský, Z., Ing. Miroslav Lev,
  • Publication: Automatika. 2015, 56(2), 1-9. ISSN 0005-1144.
  • Year: 2015
  • Department: Department of Electric Drives and Traction
  • Annotation:
    Self reactance Xd in direct axis ’d’ and self reaktance Xq in quadrature axis ’q’ influence the load characteristics of the permanent magnet machine. Their calculation methods are known. All calculations should be verified by measurements. Measurement with AC variable voltage and frequency source applied on stator winding is correct when eddy currents do not exist. Other methods evaluate the DC current decay after initial direct current was applied on the stator winding. Accuracy of these methods is lowered because of the numerical evaluation of current decay curve. Another method performs the measurement on the machine loaded as a motor. The load angle is measured by a machine set of four machines. The accuracy is lowered by higher harmonics induced in no load in the helping synchronous machine. The load angle can be also obtained by geometrical construction of the vector diagram. In this paper the evaluation of the generator steady state regime of the machine is used. The generator works with different loads consisting of capacitance, inductance or arbitrary impedance or resistance. When the generator transfers from no load to load regime the rotor is shifting and the load angle changes. This angle is measured. The newly proposed measurement methods are simple in special cases of loads. Results of measurements and their experimental verification are published in the paper.

Diagnostic of Industrial Product Failure via Industry Computer Tomography

  • Authors: Pavelka, J., Ing. Miroslav Lev,
  • Publication: XXXIII. celostátní konference o elektrických pohonech. 2013. pp. 1-6. ISBN 978-80-02-02457-6.
  • Year: 2013
  • Department: Department of Electric Drives and Traction
  • Annotation:
    This paper gives the more detailed information about the looking for the cause of failure in a switching apparatus via Computer Tomography as was done at the Department of Elelctrical Drives and Traction of Czech Technical University in Prague, Faculty of Electrical Engineering. At the end of paper, the history of this method is described.

Simulation and Implementation of Photovoltaic DC-DC Converter

  • Authors: Ing. Petr Pichlík, Ph.D., Ing. Miroslav Lev,
  • Publication: XIX. International Symposium On Electric Machinery In Prague. Praha: ČVUT FEL, Katedra elektrických pohonů a trakce, 2011, pp. 84-89. ISBN 978-80-01-04890-0.
  • Year: 2011
  • Department: Department of Electric Drives and Traction
  • Annotation:
    This paper presents simulation and implementation of DC-DC converter. The converter is connected to a photovoltaic panel. The converter is intended for implementation of various Maximum Power Point Trackers (MPPT). There are described converters and used MPPT in this paper too. Input voltage of the converter is tens of volts and maximal input power is 200 W. This power corresponds to power of a photovoltaic panel. The converter was designed to be connected to an inverter. The inverter input voltage must be more than 400 V because it is connected to single-phase grid without using transformer. This voltage is produced by the DC-DC converter.

Control Unit for 3-phase Sequentional Switch

  • Department: Department of Electric Drives and Traction
  • Annotation:
    Switching of 3-phase inductive load produced current transient phenomena which are dangerous from the point of view of circuit protection. Amplitude of current in each phase conductor depends on the switching moment and actual mains voltage value. Minimisation of load current surge is possible by means of phase sequentional switching.

Control Unit for 3-phase Sequentional Switch

  • Authors: doc. Ing. Pavel Mindl, CSc., Ing. Miroslav Lev, Čeřovský, Z.
  • Publication: Proceedings of the 9th International Scientific Conference Electric Power Engineering 2008. Brno: Brno University of Technology, 2008. pp. 405-408. ISBN 978-80-214-3650-3.
  • Year: 2008
  • Department: Department of Electric Drives and Traction
  • Annotation:
    Switching of 3-phase inductive load produced current transient phenomena which are dangerous from the point of view of circuit protection. The aim is to present mathematical and physical model of synchronized switch, which enables to minimize current non-symmetry and current surge during load making operation. Obtained results are used for semiconductor switch control unit design. Simulations and experimental results are presented.

Application of THE "dSPACE" System for Drive Control, Diagnostics and Simulation

  • Authors: Ing. Miroslav Lev,
  • Publication: XV. International Symposium on Electric Machinery in Prague. Praha: ČVUT FEL, Katedra elektrických pohonů a trakce, 2007. pp. 131-135. ISBN 978-80-01-03807-9.
  • Year: 2007
  • Department: Department of Electric Drives and Traction
  • Annotation:
    System "dSpace" application scope for drive control or diagnostics algorithm design and for electric machine simulation is presented in the paper

Three-phase load switching by synchronized circuit breaker

  • Authors: doc. Ing. Pavel Mindl, CSc., Čeřovský, Z., Ing. Miroslav Lev,
  • Publication: Proceeding of the XVII Symposium on Physics of Switching Arc. Brno: VUT v Brně, FEI, 2007. pp. 161-164. ISBN 978-80-214-3370-0.
  • Year: 2007
  • Department: Department of Electric Drives and Traction
  • Annotation:
    The paper deals with the problem switching of induction three phase load by means of electronic switch with mains inrush current surge depresion.

Air-Cored Tubular Linear Induction Motor Behaviour Analysis

  • Authors: Buhr, K., Voženílek, P., Janoušek, J., Ing. Miroslav Lev,
  • Publication: XIV-th International Symposium on Electric Machinery in Prague. Praha: ČVUT FEL, Katedra elektrických pohonů a trakce, 2006. pp. 179-185. ISBN 80-01-03548-4.
  • Year: 2006
  • Department: Department of Electric Drives and Traction
  • Annotation:
    Operation principle of air-cored tubular linear induction motor is described in the paper. System of fundamental equations and its solution were derived. Mathematical model in software system MATLAB were developped for three-phase stator winding with 96 solenoidal coils. Rotor winding is created by the one short-circuit turn (tube).

Behaviour Analysis of Cylindric Ironless Linear Induction Motor

  • Authors: Buhr, K., Voženílek, P., Janoušek, J., Ing. Miroslav Lev,
  • Publication: Low Voltage Electrical Machines. Brno: VUT v Brně, 2006. pp. 56-62. ISBN 80-214-3159-8.
  • Year: 2006
  • Department: Department of Electric Drives and Traction
  • Annotation:
    Operatin mode of linear induction motor with cylindrical winding is described in the paper. Fundamental equation system and its solution were derived. Mathematical model was based on analytical design methods of self- and mutual inductances and their derivates in dependence on the rotor position. Speed- and acceleration courses in dependence on the rotor winding coil position are the solution result of the machine motion equation. Machine model was build for three-phase stator winding having 96 coils and for the rotor created by one short-circuit coil, in software cross-products MATLAB.

Three-phase Synchronized Switching of Inductive Load

  • Authors: doc. Ing. Pavel Mindl, CSc., Čeřovský, Z., Ing. Miroslav Lev,
  • Publication: XIV-th International Symposium on Electric Machinery in Prague. Praha: ČVUT FEL, Katedra elektrických pohonů a trakce, 2006. pp. 39-43. ISBN 80-01-03548-4.
  • Year: 2006
  • Department: Department of Electric Drives and Traction
  • Annotation:
    Each switching of 3-phase load with current transient phenomena is accompanied. Amplitude of current in each phase conductor related to switching moment and actual mains voltage value. Minimization of load current surge is possible by means of phase sequentional switching. The aim is to present mathematical and physical model of synchronized switch, which enable to minimize current non-symmetry and current surge during load making operation. Achieved results are presented.

Synchronized Switching of Three-phase Inductive Load

  • Department: Department of Electric Drives and Traction
  • Annotation:
    Switching of induction three phase machine is connected with transient current peak. This peak depends a little on switching time. The transient current peak can be reduced by sequential terminals switching. The paper simulates transient current peaks using a mathematical model. In the experimental part of the paper the experiments are described and oscillogramms are published

Synchronized Switching of Three-phase Inductive Load

  • Department: Department of Electric Drives and Traction
  • Annotation:
    Switching of induction three phase machine is connected with transient current peak. This peak depends a little on switching time. The transient current peak can be reduced by sequential terminals switching. The paper simulates transient current peaks using a mathematical model. In the experimental part of the paper the experiments are described and oscillograms are published.

Teaching switching power supply

  • Authors: Ing. Miroslav Lev,
  • Publication: SYMEP 2004. Praha: CTU Publishing House, 2004. pp. 148-149. ISBN 80-01-03018-0.
  • Year: 2004
  • Department: Department of Electric Drives and Traction
  • Annotation:
    In the article is discussed extent of the subject "Transistor Inverters and Switched Sources" as well as a proper way of integrating the subject into the contex of university courses on Power electrical engineering. The students can also get informations on the basic structures of power pulse converters, and converter design, usage of snubber and protection circuits, basic modelling and controlling methods

Lifts Drive Current Status and Anticipated Development

  • Authors: Ing. Miroslav Lev,
  • Publication: 19. Mezinárodní symposium učitelů elektrických pohonů SYMEP 2002. Liberec: Technická univerzita, 2002. pp. 116-119. ISBN 80-7083-612-1.
  • Year: 2002

Responsible person Ing. Mgr. Radovan Suk