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Characteristic Analysis of Eddy Current Braking System with AC Excitation and Auxiliary Capacitor.

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Title: Characteristic Analysis of Eddy Current Braking System with AC Excitation and Auxiliary Capacitor.
Authors: Niu, Xu1 (AUTHOR), Kou, Baoquan1 (AUTHOR), Zhang, Lu1 (AUTHOR) zhanglu24@hit.edu.cn
Source: Energies (19961073). May2026, Vol. 19 Issue 9, p2118. 20p.
Subject Terms: *Eddy currents (Electric), *Alternating currents, *Capacitors, *Electric power management, *Energy harvesting, *Magnetic flux density, *High speed trains
Abstract: The eddy current braking system (ECBS) is a crucial non-contact technology for high-speed railway. Conventional DC-excited systems face significant challenges such as excessive rail heating and high-capacity power supply requirements. This paper proposes a novel ECBS with AC excitation and auxiliary capacitor to achieve integrated energy recovery and power supply optimization. To evaluate its performance, a rigorous analytical framework is developed. First, a 2D subdomain model is established by incorporating the longitudinal end effect to solve the magnetic field distribution. Subsequently, an equivalent circuit is derived from the subdomain results to investigate steady-state braking characteristics and power flow. Analysis results demonstrate that the proposed system not only generates controllable braking force but also converts a portion of kinetic energy into storable electrical energy, effectively mitigating secondary rail heating. Most significantly, the implementation of an optimal auxiliary capacitor (134 μF) is found to reduce the required inverter capacity compared to inverter-only conditions. These findings provide a theoretical foundation and a practical design tool for developing high-performance, energy-efficient braking systems in high-speed transportation. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 193716014
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Characteristic Analysis of Eddy Current Braking System with AC Excitation and Auxiliary Capacitor.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Niu%2C+Xu%22">Niu, Xu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kou%2C+Baoquan%22">Kou, Baoquan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Lu%22">Zhang, Lu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> zhanglu24@hit.edu.cn</i>
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  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Energies+%2819961073%29%22">Energies (19961073)</searchLink>. May2026, Vol. 19 Issue 9, p2118. 20p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Eddy+currents+%28Electric%29%22">Eddy currents (Electric)</searchLink><br />*<searchLink fieldCode="DE" term="%22Alternating+currents%22">Alternating currents</searchLink><br />*<searchLink fieldCode="DE" term="%22Capacitors%22">Capacitors</searchLink><br />*<searchLink fieldCode="DE" term="%22Electric+power+management%22">Electric power management</searchLink><br />*<searchLink fieldCode="DE" term="%22Energy+harvesting%22">Energy harvesting</searchLink><br />*<searchLink fieldCode="DE" term="%22Magnetic+flux+density%22">Magnetic flux density</searchLink><br />*<searchLink fieldCode="DE" term="%22High+speed+trains%22">High speed trains</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The eddy current braking system (ECBS) is a crucial non-contact technology for high-speed railway. Conventional DC-excited systems face significant challenges such as excessive rail heating and high-capacity power supply requirements. This paper proposes a novel ECBS with AC excitation and auxiliary capacitor to achieve integrated energy recovery and power supply optimization. To evaluate its performance, a rigorous analytical framework is developed. First, a 2D subdomain model is established by incorporating the longitudinal end effect to solve the magnetic field distribution. Subsequently, an equivalent circuit is derived from the subdomain results to investigate steady-state braking characteristics and power flow. Analysis results demonstrate that the proposed system not only generates controllable braking force but also converts a portion of kinetic energy into storable electrical energy, effectively mitigating secondary rail heating. Most significantly, the implementation of an optimal auxiliary capacitor (134 μF) is found to reduce the required inverter capacity compared to inverter-only conditions. These findings provide a theoretical foundation and a practical design tool for developing high-performance, energy-efficient braking systems in high-speed transportation. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.3390/en19092118
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 20
        StartPage: 2118
    Subjects:
      – SubjectFull: Eddy currents (Electric)
        Type: general
      – SubjectFull: Alternating currents
        Type: general
      – SubjectFull: Capacitors
        Type: general
      – SubjectFull: Electric power management
        Type: general
      – SubjectFull: Energy harvesting
        Type: general
      – SubjectFull: Magnetic flux density
        Type: general
      – SubjectFull: High speed trains
        Type: general
    Titles:
      – TitleFull: Characteristic Analysis of Eddy Current Braking System with AC Excitation and Auxiliary Capacitor.
        Type: main
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            NameFull: Niu, Xu
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            NameFull: Kou, Baoquan
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            NameFull: Zhang, Lu
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          Dates:
            – D: 01
              M: 05
              Text: May2026
              Type: published
              Y: 2026
          Identifiers:
            – Type: issn-print
              Value: 19961073
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              Value: 19
            – Type: issue
              Value: 9
          Titles:
            – TitleFull: Energies (19961073)
              Type: main
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