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Modelling of low-speed magnetic gear with viscose ferrofluid

Valentin Mateev (Department of Electrical Apparatus, Technical University of Sofia, Sofia, Bulgaria)
Iliana Marinova (Department of Electrical Apparatus, Technical University of Sofia, Sofia, Bulgaria)

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering

ISSN: 0332-1649

Article publication date: 17 May 2022

Issue publication date: 26 August 2022

87

Abstract

Purpose

In this paper, a computational model of a coaxial magnetic gear (MG) design with viscose ferrofluid between rotors is proposed. Viscose ferrofluid is used to decrease the magnetic reluctance and therefore creates higher magnetic torque. However, viscose friction of ferrofluid is undesirable and must be minimised in this particular application. MG is supposed to operate under low rotational speeds, where the dynamic viscose friction is very low, and the effects of the viscose ferrofluid over the MG’s efficiency must be estimated. The paper aims to analyze the performance of MG with viscose ferrofluid and to estimate the MG efficiency by computational model using finite element method (FEM).

Design/methodology/approach

An MG design with viscose ferrofluid between the outer low-speed rotor and modulating steel segments was modelled as a coupled transient magnetic field problem and a kinematic model with viscous friction coefficients derived from a previously computed fluid dynamics model.

Findings

The proposed computational implementation is suitable for homogeneous magnetic fluid modelling in electromagnetic actuators and rotational machines. The results regarding power and torque transmission of MG were obtained by coupled finite element modelling. The efficiency of MG significantly decreased due to ferrofluid friction.

Originality/value

The described MG design with viscose ferrofluid is a novel device with new operational characteristics, and new results for the effects of viscose ferrofluid friction in the outer magnetic field over the MG efficiency are estimated.

Keywords

Acknowledgements

This work was supported by the National Science Fund of the Ministry of Education and Science of the Republic of Bulgaria under contract DN17/5 “Mechatronic magneto-mechanical transmission systems”.

Citation

Mateev, V. and Marinova, I. (2022), "Modelling of low-speed magnetic gear with viscose ferrofluid", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 41 No. 5, pp. 1956-1970. https://doi.org/10.1108/COMPEL-07-2021-0233

Publisher

:

Emerald Publishing Limited

Copyright © 2022, Emerald Publishing Limited

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