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Modelling of low-speed magnetic gear with viscose ferrofluid.

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Title: Modelling of low-speed magnetic gear with viscose ferrofluid.
Authors: Mateev, Valentin1 (AUTHOR) vmateev@tu-sofia.bg, Marinova, Iliana1 (AUTHOR) iliana@tu-sofia.bg
Source: COMPEL. 2022, Vol. 41 Issue 5, p1956-1970. 15p.
Subjects: Viscose, Magnetic torque, Electromagnetic actuators, Sliding friction, Magnetic fluids
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. [ABSTRACT FROM AUTHOR]
Copyright of COMPEL is the property of Emerald Publishing Limited and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 158698100
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Modelling of low-speed magnetic gear with viscose ferrofluid.
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  Data: <searchLink fieldCode="AR" term="%22Mateev%2C+Valentin%22">Mateev, Valentin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> vmateev@tu-sofia.bg</i><br /><searchLink fieldCode="AR" term="%22Marinova%2C+Iliana%22">Marinova, Iliana</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> iliana@tu-sofia.bg</i>
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  Data: <searchLink fieldCode="JN" term="%22COMPEL%22">COMPEL</searchLink>. 2022, Vol. 41 Issue 5, p1956-1970. 15p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Viscose%22">Viscose</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+torque%22">Magnetic torque</searchLink><br /><searchLink fieldCode="DE" term="%22Electromagnetic+actuators%22">Electromagnetic actuators</searchLink><br /><searchLink fieldCode="DE" term="%22Sliding+friction%22">Sliding friction</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+fluids%22">Magnetic fluids</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: 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. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of COMPEL is the property of Emerald Publishing Limited and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1108/COMPEL-07-2021-0233
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 15
        StartPage: 1956
    Subjects:
      – SubjectFull: Viscose
        Type: general
      – SubjectFull: Magnetic torque
        Type: general
      – SubjectFull: Electromagnetic actuators
        Type: general
      – SubjectFull: Sliding friction
        Type: general
      – SubjectFull: Magnetic fluids
        Type: general
    Titles:
      – TitleFull: Modelling of low-speed magnetic gear with viscose ferrofluid.
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          Name:
            NameFull: Mateev, Valentin
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          Name:
            NameFull: Marinova, Iliana
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          Dates:
            – D: 01
              M: 09
              Text: 2022
              Type: published
              Y: 2022
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              Value: 03321649
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              Value: 41
            – Type: issue
              Value: 5
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            – TitleFull: COMPEL
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