Torque Analysis for Rotational Devices with Nonmagnetic Rotor Driven by Magnetic Fluid Filled in Air Gap

Gui-Hwan Kim and Hong-Soon Choi
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Gui-Hwan Kim: Department of Electrical Engineering, Kyungpook National University, 80, Daehak-ro, Buk-gu, Daegu 41566, Korea
Hong-Soon Choi: Department of Electrical Engineering, Kyungpook National University, 80, Daehak-ro, Buk-gu, Daegu 41566, Korea

Energies, 2021, vol. 14, issue 15, 1-12

Abstract: 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 (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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