Original title: Study of the oscillation of a pendulum in a magnetic field
Authors: Zapoměl, Jaroslav ; Kozánek, Jan ; Košina, Jan ; Cibulka, Jan
Document type: Papers
Conference/Event: Computational Mechanics 2022 /37./, Srní (CZ), 20221107
Year: 2022
Language: eng
Abstract: Realization of some technological processes requires application of rotating machines with a vertical rotor mounted in rolling element bearings. One of the requirements put on their operation is minimization of energy losses in the support elements. The proposed design variant consists in supporting the vertical rotor by one rolling element bearing placed at its upper part and by one axial magnetic bearing mounted in its lower end. The magnetic bearing is composed of an electric coil coupled with the stationary part and of a permanent magnet attached to the rotating part. The magnetic force attracts the permanent magnet, which reduces radial displacement of the lower end of the rotor. The magnetic field between the magnets represents a force coupling between the rotor and the stationary part, which shows some stiffness and affects the system natural frequencies. The controlled change of the stiffness makes it possible to reduce the rotor lateral oscillations in the resonance area. The investigated pendulum is coupled with the frame by a revolute joint at its upper end. The permanent magnet is attached to its lower end. The electric coil is coupled with the stationary part and placed under the pendulum. The system is excited by a moment of harmonic time history, which sets the pendulum into a seesaw motion.\n\n
Keywords: axial magnetic bearings; lateral oscillations; pendulum; resonance; vertical rotor
Host item entry: Proceedings of Computational mechanics 2022, ISBN 978-80-261-1116-0

Institution: Institute of Thermomechanics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: https://hdl.handle.net/11104/0338009

Permalink: http://www.nusl.cz/ntk/nusl-519834

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Research > Institutes ASCR > Institute of Thermomechanics
Conference materials > Papers
 Record created 2023-01-15, last modified 2023-12-06

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