Lidé

doc. Ing. Miroslav Chomát, CSc.

Všechny publikace

Influence of Input-Voltage Waveform on Current-Torque Ratio of Brushless DC Motors

  • Autoři: Stejskal, J., doc. Ing. Miroslav Chomát, CSc.,
  • Publikace: 2021 IEEE 19th International Power Electronics and Motion Control Conference (PEMC). Warsaw: IEEE, 2021. p. 467-472. ISSN 2473-0165. ISBN 978-1-7281-5660-6.
  • Rok: 2021
  • DOI: 10.1109/PEMC48073.2021.9432604
  • Odkaz: https://doi.org/10.1109/PEMC48073.2021.9432604
  • Pracoviště: Katedra elektrických pohonů a trakce
  • Anotace:
    This paper analyzes the influence of input-voltage waveform on the performance of a three-phase brushless DC (BLDC) motor. The six-step control and the V/Hz control are used in the analysis with focus on time harmonics. The solution shows how to use higher time harmonics in the supply voltage to increase the current-torque ratio of BLDC motors. The simulation is made for both delta- and star-connected BLDC motors with high harmonic distortion of its back electromotive force (BEMF). The theoretical results are compared with experimental measurements.

Reactive Power MRAS for Rotor Resistance Estimation Taking Into Account Load-Dependent Saturation of Induction Motor

  • DOI: 10.1109/EDPE.2019.8883887
  • Odkaz: https://doi.org/10.1109/EDPE.2019.8883887
  • Pracoviště: Katedra elektrických pohonů a trakce
  • Anotace:
    The accuracy of induction motor (IM) drive with employed field-oriented control depends on precise identification of the IM equivalent circuit parameters. Those parameters can change significantly during the drive operation. Therefore, an adaptation of the IM model parameters is needed for a high-performance drive. Estimators based on model reference adaptive system (MRAS) are not computationally demanding, but they a priori exhibit sensitivity to the other, non-estimated parameters. This paper analyses the influence of the proper knowledge of the magnetizing inductance on the accuracy of the rotor resistance estimator based on the traditional reactive power MRAS. The paper also takes into account the load-dependent saturation of the IM, which is often omitted during the analysis and shows that the implemented load-dependent magnetization characteristic improves the MRAS and drive performance. Simulation and experimental results conducted on 12 kW IM are presented.

Energy-Saving Sliding Mode Control for Synchronous Drive Fed by Renewable Energy Source

  • Autoři: Ryvkin, S., doc. Ing. Miroslav Chomát, CSc.,
  • Publikace: Proceedings of ACEMP - OPTIM - ELECTROMOTION JOINT CONFERENCE. Ankara: Middle East Technical University, 2015. pp. 582-587. ISBN 978-1-4673-7239-8.
  • Rok: 2015
  • Pracoviště: Katedra elektrických pohonů a trakce
  • Anotace:
    The sliding mode control technique applied to the drive control is analyzed in terms of dynamic response and energy saving in a stand-alone network. The drive is equipped with a surface-mounted permanent magnet synchronous motor fed by renewable power through a voltage-source inverter. The design of sliding mode control is presented, and it is shown that the developed control eliminates the influence of instability in the power flow of renewable energy sources on the drive behavior. The control also eliminates the reactive-power consumption. Simulations in MATLAB/Simulink verify the proposed sliding mode control.

Simulation of Single-Phase Induction Machine

  • Autoři: Linhart, F., doc. Ing. Miroslav Chomát, CSc., Voženílek, P.
  • Publikace: International Conference on Low Voltage Electrical Machines. Brno: VUT v Brně, FEI, 2008. ISBN 978-80-214-3795-1.
  • Rok: 2008
  • Pracoviště: Katedra elektrických pohonů a trakce
  • Anotace:
    Objective of this paper is induction machine simulation for various running conditions, after it check up of mechanical loading influence on the machine. Different capacitors were chosen for the simulation, loading torque was considered like the steady one. Mathematical model was compared with real machine.

Analysis of Inductances in Saturated Induction Machine

  • Pracoviště: Katedra elektrických pohonů a trakce, Katedra elektroenergetiky
  • Anotace:
    The paper focuses on dependences of individual stator winding inductances on magnetic saturation in the induction machine. Magnetizing currents with a range of magnitudes and phase angles were considered to cause saturation of magnetic paths in the machine. Mutual inductances between stator phases for superimposed small signals that do not contribute to the saturation significantly were numerically computed and analysed. The finite element method was employed in the investigation.

Analysis of Inductances in Saturated Induction Machine

  • Pracoviště: Katedra elektrických pohonů a trakce, Katedra elektroenergetiky
  • Anotace:
    The paper focuses on dependences of individual stator winding inductances on magnetic saturation in the induction machine. Magnetizing currents with a range of magnitudes and phase angles were considered to cause saturation of magnetic paths in the machine. Mutual inductances between stator phases for superimposed small signals that do not contribute to the saturation significantly were numerically computed and analysed. The finite element method was employed in the investigation.

Za stránku zodpovídá: Ing. Mgr. Radovan Suk