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An Initial Position Estimation Method for Dual Three-Phase IPMSM in Standstill/Free-Running States.

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Title: An Initial Position Estimation Method for Dual Three-Phase IPMSM in Standstill/Free-Running States.
Authors: Xu, Yang1 (AUTHOR), Wu, Zheng1 (AUTHOR), Hua, Wei1 (AUTHOR) huawei1978@seu.edu.cn
Source: Energies (19961073). May2026, Vol. 19 Issue 9, p2066. 17p.
Subject Terms: *Moving average process, *Permanent magnet motors, *Vector analysis, *Magnetostriction
Abstract: Dual three-phase interior permanent magnet synchronous motors (DT-IPMSMs) are widely used in high-power and high-reliability applications, and accurate rotor polarity identification at startup is a critical prerequisite for their stable and efficient operation. This study aims to address the problem of initial position acquisition during the startup of DT-IPMSMs by proposing a simple and fast rotor polarity identification method. The proposed method is based on the high-frequency square-wave voltage injection (HFSWVI) in the vector space decomposition (VSD) space, where both the current and voltage are injected into the d-axis. The single-pulse direct current (DC) injection is used to alter the magnetic saturation. Then, the change rates of the d-axis high-frequency response current are compared before and after DC injection to identify the rotor magnetic polarity. In addition, a moving average filter (MAF) is applied to suppress the fluctuations in the current change rate, which increases the accuracy of polarity identification. Moreover, a simple compensation technique is designed to make the estimated d-axis current change smoothly when the estimated angle changes from N-pole to S-pole. The effectiveness of the proposed method is proved by the experimental results in both standstill and free-running states for the prototyped DT-IPMSMs. This method provides a practical and efficient solution for initial position identification of DT-IPMSMs, contributing to the advancement of control technology for dual three-phase motor systems in related fields. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 193715962
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: An Initial Position Estimation Method for Dual Three-Phase IPMSM in Standstill/Free-Running States.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Xu%2C+Yang%22">Xu, Yang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wu%2C+Zheng%22">Wu, Zheng</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hua%2C+Wei%22">Hua, Wei</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> huawei1978@seu.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, p2066. 17p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Moving+average+process%22">Moving average process</searchLink><br />*<searchLink fieldCode="DE" term="%22Permanent+magnet+motors%22">Permanent magnet motors</searchLink><br />*<searchLink fieldCode="DE" term="%22Vector+analysis%22">Vector analysis</searchLink><br />*<searchLink fieldCode="DE" term="%22Magnetostriction%22">Magnetostriction</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Dual three-phase interior permanent magnet synchronous motors (DT-IPMSMs) are widely used in high-power and high-reliability applications, and accurate rotor polarity identification at startup is a critical prerequisite for their stable and efficient operation. This study aims to address the problem of initial position acquisition during the startup of DT-IPMSMs by proposing a simple and fast rotor polarity identification method. The proposed method is based on the high-frequency square-wave voltage injection (HFSWVI) in the vector space decomposition (VSD) space, where both the current and voltage are injected into the d-axis. The single-pulse direct current (DC) injection is used to alter the magnetic saturation. Then, the change rates of the d-axis high-frequency response current are compared before and after DC injection to identify the rotor magnetic polarity. In addition, a moving average filter (MAF) is applied to suppress the fluctuations in the current change rate, which increases the accuracy of polarity identification. Moreover, a simple compensation technique is designed to make the estimated d-axis current change smoothly when the estimated angle changes from N-pole to S-pole. The effectiveness of the proposed method is proved by the experimental results in both standstill and free-running states for the prototyped DT-IPMSMs. This method provides a practical and efficient solution for initial position identification of DT-IPMSMs, contributing to the advancement of control technology for dual three-phase motor systems in related fields. [ABSTRACT FROM AUTHOR]
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    Identifiers:
      – Type: doi
        Value: 10.3390/en19092066
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 17
        StartPage: 2066
    Subjects:
      – SubjectFull: Moving average process
        Type: general
      – SubjectFull: Permanent magnet motors
        Type: general
      – SubjectFull: Vector analysis
        Type: general
      – SubjectFull: Magnetostriction
        Type: general
    Titles:
      – TitleFull: An Initial Position Estimation Method for Dual Three-Phase IPMSM in Standstill/Free-Running States.
        Type: main
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            NameFull: Xu, Yang
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            NameFull: Wu, Zheng
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            NameFull: Hua, Wei
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            – D: 01
              M: 05
              Text: May2026
              Type: published
              Y: 2026
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              Value: 19961073
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              Value: 19
            – Type: issue
              Value: 9
          Titles:
            – TitleFull: Energies (19961073)
              Type: main
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