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Torque Ripple Reduction Method in a Multiphase PM Machine for No-Fault and Open-Circuit Fault-Tolerant Conditions

Author

Listed:
  • Ali Akay

    (School of Engineering, University of Leicester, Leicester LE1 7RH, UK)

  • Paul Lefley

    (School of Engineering, University of Leicester, Leicester LE1 7RH, UK)

Abstract

This paper presents a method that has been developed to reduce the torque ripples under healthy and open-circuit fault-tolerant (OCFT) conditions for a multiphase permanent magnet (PM) machine. For smooth torque, both the phase current and the back electromotive force (back-EMF) should be purely sinusoidal. To improve the torque in a multiphase machine, higher-order current harmonics are injected, which are related to the harmonics in the back-EMF. For this reason, generally, multiphase machines are designed with higher-order back-EMF harmonics. However, these harmonics produce ripples in the torque. In light of this, a torque ripple cancellation method has been developed that first determines an additional current component from the harmonic content of the back-EMF and then injects these additional components to cancel the torque ripple. It has been found that this new torque ripple cancellation method works for both faultless and faulty conditions in a five-phase PM machine. The method has been validated using Finite Element Analysis, and the results are presented in this paper.

Suggested Citation

  • Ali Akay & Paul Lefley, 2021. "Torque Ripple Reduction Method in a Multiphase PM Machine for No-Fault and Open-Circuit Fault-Tolerant Conditions," Energies, MDPI, vol. 14(9), pages 1-18, May.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:9:p:2615-:d:548194
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    References listed on IDEAS

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    1. Jing Zhao & Xu Gao & Bin Li & Xiangdong Liu & Xing Guan, 2015. "Open-Phase Fault Tolerance Techniques of Five-Phase Dual-Rotor Permanent Magnet Synchronous Motor," Energies, MDPI, vol. 8(11), pages 1-29, November.
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    Cited by:

    1. Duc Tan Vu & Ngac Ky Nguyen & Eric Semail & Hailong Wu, 2021. "Adaline-Based Control Schemes for Non-Sinusoidal Multiphase Drives–Part I: Torque Optimization for Healthy Mode," Energies, MDPI, vol. 14(24), pages 1-22, December.
    2. Jan Laksar & Radek Cermak & Karel Hruska, 2021. "Challenges in the Electromagnetic Design of Multiphase Machines: Winding and Equivalent Circuit Parameters," Energies, MDPI, vol. 14(21), pages 1-19, November.

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