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Analysis and Optimal Design of Coaxial Magnetic Gears with Surface-Mounted Permanent Magnets.

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Title: Analysis and Optimal Design of Coaxial Magnetic Gears with Surface-Mounted Permanent Magnets.
Authors: Makarchuk, Oleksandr1,2 (AUTHOR), Calus, Dariusz1,2 (AUTHOR) dariusz.calus@pcz.pl
Source: Energies (19961073). May2026, Vol. 19 Issue 10, p2306. 25p.
Subject Terms: *Magnetic torque, *Mathematical models, *Power transmission, *Magnetic flux, *Permanent magnets, *Torquemeters
Abstract: Contactless transmission of mechanical power, which is characteristic of coaxial magnetic gears (CMGs), offers significant advantages over conventional mechanical gears, in particular, reduced maintenance frequency and inherent overload protection. At the same time, there is a lack of design methodologies for this type of gear based on the analysis and systematization of experience gained from already implemented designs. This paper presents a method for determining the maximum magnetic torques of CMGs on the basis of an equivalent magnetic-circuit model. The error associated with the proposed methodology does not exceed ±15%, which enables the influence of geometric parameters and the magnetic properties of materials on the key performance indicators of the gear to be assessed already at the preliminary design stage. A mathematical model of CMG dynamics was also developed, based on a quasi-stationary two-dimensional approximation of the magnetic field, accounting for the geometry of the magnetic circuit, the spatial distribution of the magnetic vector potential, and magnetic-circuit saturation. The proposed mathematical model was verified using the results of physical experiments. The discrepancy between the calculated and experimental values of the torque on the low-speed shaft in the steady state does not exceed 5.5%. Based on the optimization procedure, the dependence of the maximum linear torque density on the outer diameter of the CMG, the number of poles of the high-speed rotor, and the transmission ratio was determined. It was shown that, as the number of poles increases, the linear torque density also increases and, for example, for diameters of approximately 800 mm, it may exceed 100 N·m/m. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 194141421
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Analysis and Optimal Design of Coaxial Magnetic Gears with Surface-Mounted Permanent Magnets.
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  Data: <searchLink fieldCode="AR" term="%22Makarchuk%2C+Oleksandr%22">Makarchuk, Oleksandr</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Calus%2C+Dariusz%22">Calus, Dariusz</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> dariusz.calus@pcz.pl</i>
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  Data: <searchLink fieldCode="JN" term="%22Energies+%2819961073%29%22">Energies (19961073)</searchLink>. May2026, Vol. 19 Issue 10, p2306. 25p.
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  Data: *<searchLink fieldCode="DE" term="%22Magnetic+torque%22">Magnetic torque</searchLink><br />*<searchLink fieldCode="DE" term="%22Mathematical+models%22">Mathematical models</searchLink><br />*<searchLink fieldCode="DE" term="%22Power+transmission%22">Power transmission</searchLink><br />*<searchLink fieldCode="DE" term="%22Magnetic+flux%22">Magnetic flux</searchLink><br />*<searchLink fieldCode="DE" term="%22Permanent+magnets%22">Permanent magnets</searchLink><br />*<searchLink fieldCode="DE" term="%22Torquemeters%22">Torquemeters</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Contactless transmission of mechanical power, which is characteristic of coaxial magnetic gears (CMGs), offers significant advantages over conventional mechanical gears, in particular, reduced maintenance frequency and inherent overload protection. At the same time, there is a lack of design methodologies for this type of gear based on the analysis and systematization of experience gained from already implemented designs. This paper presents a method for determining the maximum magnetic torques of CMGs on the basis of an equivalent magnetic-circuit model. The error associated with the proposed methodology does not exceed ±15%, which enables the influence of geometric parameters and the magnetic properties of materials on the key performance indicators of the gear to be assessed already at the preliminary design stage. A mathematical model of CMG dynamics was also developed, based on a quasi-stationary two-dimensional approximation of the magnetic field, accounting for the geometry of the magnetic circuit, the spatial distribution of the magnetic vector potential, and magnetic-circuit saturation. The proposed mathematical model was verified using the results of physical experiments. The discrepancy between the calculated and experimental values of the torque on the low-speed shaft in the steady state does not exceed 5.5%. Based on the optimization procedure, the dependence of the maximum linear torque density on the outer diameter of the CMG, the number of poles of the high-speed rotor, and the transmission ratio was determined. It was shown that, as the number of poles increases, the linear torque density also increases and, for example, for diameters of approximately 800 mm, it may exceed 100 N·m/m. [ABSTRACT FROM AUTHOR]
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        Value: 10.3390/en19102306
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      – Code: eng
        Text: English
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        PageCount: 25
        StartPage: 2306
    Subjects:
      – SubjectFull: Magnetic torque
        Type: general
      – SubjectFull: Mathematical models
        Type: general
      – SubjectFull: Power transmission
        Type: general
      – SubjectFull: Magnetic flux
        Type: general
      – SubjectFull: Permanent magnets
        Type: general
      – SubjectFull: Torquemeters
        Type: general
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      – TitleFull: Analysis and Optimal Design of Coaxial Magnetic Gears with Surface-Mounted Permanent Magnets.
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            NameFull: Makarchuk, Oleksandr
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            NameFull: Calus, Dariusz
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            – D: 15
              M: 05
              Text: May2026
              Type: published
              Y: 2026
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              Value: 19
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              Value: 10
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            – TitleFull: Energies (19961073)
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