Кафедра фізики і електротехніки

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https://elar.khmnu.edu.ua/handle/123456789/577

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Перегляд Кафедра фізики і електротехніки за Автор "Zembytska, Maryna"

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  • Ескіз
    Документ
    Analysis of Unbalanced Induction Motor Rotor Forces in Bearings with Clearances
    (Israeli independent academy of development of science, Holon, Israel, 2024-11) Goroshko, Andrii; Zembytska, Maryna
    The paper analyzes the influence of unbalanced rotor forces of induction motor on the operation of bearings with clearances. A mathematical model considering mechanical unbalance and static magnetic unbalance is developed in the paper. The results of modeling showed that the joint action of these factors leads to unstable operation mode of bearings and accelerated wear. The unbalance factor depends on the static eccentricity angle and the instantaneous value of the trunnion rotation angle. The obtained results can be used to optimize the design of induction motors and to develop methods of diagnostics of their condition.
  • Ескіз
    Документ
    Metaphysical Modeling of Rotor dynamics Motor Spindle with magnetic Eccentricity
    (Israeli independent Academy of development of Science, 2026-03) Goroshko, Andrii; Zembytska, Maryna
    The paper presents a metaphysical model of the rotor dynamics of an asynchronous motor spindle that accounts for the effect of magnetic eccentricity. The study proposes a new approach to modeling unbalanced magnetic pull (UMP) based on a variable mutual inductance of the magnetizing circuit instead of the classical Maxwell stress tensor method. Analytical dependences between the air-gap eccentricity, magnetizing inductance, and UMP components are derived, and a modified Simscape/Simulink model of the asynchronous machine is implemented to simulate these relationships. The simulation results demonstrate the influence of magnetic eccentricity on the electromagnetic torque, stator current spectrum, and rotor speed. The proposed model provides a practical tool for diagnosing eccentricity-related faults and predicting vibration behavior in motor spindles
  • Ескіз
    Документ
    Modeling of Eccentric Rotor Dynamics in an Unbalanced Magnetic Field
    (Khmelnytskyi National University, 2024-06) Goroshko, Andrii; Zembytska, Maryna
    The paper studies the dynamics of a three-phase induction motor with squirrel cage rotor, which has eccentricity of different kinds. For this purpose, a mathematical model of oscillations of a rigid rotor with mass eccentricity, which oscillates on two elastic supports, is established. The model is further extended to take into account the forces of unbalanced magnetic pull, which arise under static and dynamic magnetic eccentricity. A simulation model in Simulink/Simscape Multibody environment is created to solve the obtained nonlinear model. The simulation of induction motor dynamics is carried out and the vibration signals are analyzed in time and frequency domain. Vib ations caused by static magnetic eccentricity occur at twice the electrical frequency. Vibrations caused by dynamic eccentricity take the form of a rotor frequency signal modulated by a low frequency depending on the rotor precession. The model can be used for vibration diagnostics of motor rotor eccentricity.
  • Ескіз
    Документ
    Quality and Reliability of Technical Systems: Theory and Practice
    (JVE International Ltd, 2018-08) Goroshko, Andrii; Royzman, Vilen; Zembytska, Maryna
    The monograph provides original approaches to the quality and reliability improvement in mechanical engineering, taking into account the functionally oriented management. The outlined studies validate the methods facilitating the increased reliability and durability of rotor systems and vibration processes. Methods for increasing the reliability and wear resistance of machine parts and units under dynamic and shock loads are considered and proposed. The issues of creation of new materials in mechanical engineering, in particular, nanostructures are studied and investigated. New quality and reliability improving methods for electronic equipment and energy systems are offered. The research also considers the issues of reliability and durability of construction materials. The monograph is intended for scientists, graduate students and professionals in the field. It may also be useful to students of technology.
  • Ескіз
    Документ
    Simulation of induction motor vibrations under the Influence mechanical and magnetic eccentricit
    (2023-12) Goroshko, Andrii; Zembytska, Maryna
    The paper analyzes the influence of unbalanced rotor forces of induction motor on the operation of bearings with clearances. A mathematical model considering mechanical unbalance and static magnetic unbalance is developed in the paper. The results of modeling showed that the joint action of these factors leads to unstable operation mode of bearings and accelerated wear. The unbalance factor depends on the static eccentricity angle and the instantaneous value of the trunnion rotation angle. The obtained results can be used to optimize the design of induction motors and to develop methods of diagnostics of their condition.