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Electrical-Angle-Partitioned SHEPWM for Field-Oriented Control of Permanent Magnet Synchronous Motor Drives at Low Carrier Ratios.

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Title: Electrical-Angle-Partitioned SHEPWM for Field-Oriented Control of Permanent Magnet Synchronous Motor Drives at Low Carrier Ratios.
Authors: Bai, Yang1 (AUTHOR), Wu, Fengjiang1,2 (AUTHOR), Su, Jianyong1,2 (AUTHOR) sujianyong@hit.edu.cn
Source: Energies (19961073). Sep2026, Vol. 19 Issue 18, p4466. 32p.
Subject Terms: *Field orientation principle, *Pulse width modulation, *Permanent magnet motors
Abstract: When inverter switching frequency is constrained, PMSM drives operating at relatively high fundamental electrical frequencies may exhibit a low switching-to-fundamental-frequency ratio (low carrier ratio), resulting in fewer voltage vector updates per fundamental cycle and increased current ripple and low-order harmonics. To address the difficulty of synchronizing offline selective harmonic elimination PWM (SHEPWM) switching angles with a field-oriented control (FOC) current loop, this paper proposes an angle-synchronous FOC-SHEPWM implementation based on electrical angle partitioning. A quarter-wave-symmetric SHEPWM model is first established, and the switching angles are solved using Newton iteration and homotopy continuation. A Halton low-discrepancy initial value pool is then constructed. Combined with cumulative interval mapping, admissibility screening, and continuity assessment, it yields switching angle trajectories suitable for closed-loop look-up table implementation and extends the high-modulation-index range toward six-step operation. For online implementation, the ePWM period is updated according to the electrical angular speed, and the offline angles are mapped to intra-partition compare values. Counter-zero sampling, delay angle compensation, dynamic period correction, and fundamental current extraction are integrated to realize synchronized closed-loop pulse generation. The simulation and experimental results demonstrate the stable operation of the SHEPWM-N3, SHEPWM-N5, and SHEPWM-N7 patterns. At equal numbers of switching events, the proposed patterns exhibit lower low-order harmonic content and current total harmonic distortion than ASVPWM, while the fundamental current extraction and dynamic period correction methods reduce d-q-axis current ripple and partition synchronization error, respectively. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 197391833
AccessLevel: 6
PubType: Academic Journal
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Electrical-Angle-Partitioned SHEPWM for Field-Oriented Control of Permanent Magnet Synchronous Motor Drives at Low Carrier Ratios.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Bai%2C+Yang%22">Bai, Yang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wu%2C+Fengjiang%22">Wu, Fengjiang</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Su%2C+Jianyong%22">Su, Jianyong</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> sujianyong@hit.edu.cn</i>
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Energies+%2819961073%29%22">Energies (19961073)</searchLink>. Sep2026, Vol. 19 Issue 18, p4466. 32p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Field+orientation+principle%22">Field orientation principle</searchLink><br />*<searchLink fieldCode="DE" term="%22Pulse+width+modulation%22">Pulse width modulation</searchLink><br />*<searchLink fieldCode="DE" term="%22Permanent+magnet+motors%22">Permanent magnet motors</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: When inverter switching frequency is constrained, PMSM drives operating at relatively high fundamental electrical frequencies may exhibit a low switching-to-fundamental-frequency ratio (low carrier ratio), resulting in fewer voltage vector updates per fundamental cycle and increased current ripple and low-order harmonics. To address the difficulty of synchronizing offline selective harmonic elimination PWM (SHEPWM) switching angles with a field-oriented control (FOC) current loop, this paper proposes an angle-synchronous FOC-SHEPWM implementation based on electrical angle partitioning. A quarter-wave-symmetric SHEPWM model is first established, and the switching angles are solved using Newton iteration and homotopy continuation. A Halton low-discrepancy initial value pool is then constructed. Combined with cumulative interval mapping, admissibility screening, and continuity assessment, it yields switching angle trajectories suitable for closed-loop look-up table implementation and extends the high-modulation-index range toward six-step operation. For online implementation, the ePWM period is updated according to the electrical angular speed, and the offline angles are mapped to intra-partition compare values. Counter-zero sampling, delay angle compensation, dynamic period correction, and fundamental current extraction are integrated to realize synchronized closed-loop pulse generation. The simulation and experimental results demonstrate the stable operation of the SHEPWM-N3, SHEPWM-N5, and SHEPWM-N7 patterns. At equal numbers of switching events, the proposed patterns exhibit lower low-order harmonic content and current total harmonic distortion than ASVPWM, while the fundamental current extraction and dynamic period correction methods reduce d-q-axis current ripple and partition synchronization error, respectively. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.3390/en19184466
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 32
        StartPage: 4466
    Subjects:
      – SubjectFull: Field orientation principle
        Type: general
      – SubjectFull: Pulse width modulation
        Type: general
      – SubjectFull: Permanent magnet motors
        Type: general
    Titles:
      – TitleFull: Electrical-Angle-Partitioned SHEPWM for Field-Oriented Control of Permanent Magnet Synchronous Motor Drives at Low Carrier Ratios.
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            NameFull: Bai, Yang
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            NameFull: Wu, Fengjiang
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            NameFull: Su, Jianyong
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            – D: 15
              M: 09
              Text: Sep2026
              Type: published
              Y: 2026
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              Value: 19961073
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              Value: 19
            – Type: issue
              Value: 18
          Titles:
            – TitleFull: Energies (19961073)
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