LAPSE:2023.25619
Published Article
LAPSE:2023.25619
Torque Analysis for Rotational Devices with Nonmagnetic Rotor Driven by Magnetic Fluid Filled in Air Gap
Gui-Hwan Kim, Hong-Soon Choi
March 29, 2023
In magnetomechanical applications, it is necessary to calculate the magnetic force or torque of specific objects. If the magnetic fluid is involved, the force and torque also include the effect of pressure caused by the fluid. The standard method is to solve the Navier−Stokes equation. However, obtaining magnetic body force density is still under controversy. To resolve this problem, this paper shows that the calculation of the torque of these applications should not only use the magnetic force calculation method, but also consider the mechanical pressure using an indirect approach, such as the virtual work principle. To illustrate this, we use an experimental motor made of a nonmagnetic rotor immersed in a magnetic fluid. Then, we show that the virtual work principle in appropriate approach can calculate the output torque of the nonmagnetic rotor due to pressure of the magnetic fluid. Numerical analysis and experimental results show the validity of this approach. In addition, we also explain how the magnetic fluid transmits its magnetic force to the stator and rotor, respectively.
Keywords
magnetic fluid, magnetic torque, pressure, virtual work principle
Suggested Citation
Kim GH, Choi HS. Torque Analysis for Rotational Devices with Nonmagnetic Rotor Driven by Magnetic Fluid Filled in Air Gap. (2023). LAPSE:2023.25619
Author Affiliations
Kim GH: Department of Electrical Engineering, Kyungpook National University, 80, Daehak-ro, Buk-gu, Daegu 41566, Korea [ORCID]
Choi HS: Department of Electrical Engineering, Kyungpook National University, 80, Daehak-ro, Buk-gu, Daegu 41566, Korea
Journal Name
Energies
Volume
14
Issue
15
First Page
4669
Year
2021
Publication Date
2021-08-01
Published Version
ISSN
1996-1073
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Original Submission
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PII: en14154669, Publication Type: Journal Article
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LAPSE:2023.25619
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doi:10.3390/en14154669
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