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<p>In distinction to the induced electromotive force (EMF) in armature winding, the induced EMF in the excitation winding deteriorates the performance of wound field flux switching machines (WFFSMs). It leads to the generation of unstable field excitation, resulting in increased torque pulsations and losses. This article investigates the five phase non-overlapped WFFSMs to analyze and reduce the excitation winding induced EMF. The proposed machines combine the advantages of WFFSMs, non-overlapped windings, and the key benefits of multi-phase machines. The non-overlapped configuration of winding offers many advantages such as reduced copper losses, design simplicity, greater mechanical robustness, and simpler operation. The phenomena of the excitation winding induced EMF is briefly analyzed and explained. The harmonic orders of the excitation winding induced EMF are analytically derived and verified through finite element analysis (FEA). The on-load induced EMF is comprised of the induced EMF caused by the open circuit and armature reaction. Hence, three reduction techniques such as chamfering, rotor pole arc optimization and rotor pole axial pairing are applied and optimized to minimize the excitation winding induced EMF under on-load condition. The maximum reduction of 46.54% is achieved through rotor pole arc optimization, while rotor pole chamfering and rotor pole axial pairing yield reductions of up to 43.92% and 32.93%, respectively. Meanwhile, the average output torque is maintained over 90% of its initial value for all analyzed reduction techniques. Finally, prototypes for the WFFSMs with various rotor structures are fabricated to validate the results.</p>

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Harmonic order modeling and reduction of excitation winding induced EMF in five phase non-overlapped wound field flux switching machines

  • 期刊论文

  • 发表日期：

    2025年7月6日

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  • Muhammad Yousuf,
  • Faisal Khan

摘要

In distinction to the induced electromotive force (EMF) in armature winding, the induced EMF in the excitation winding deteriorates the performance of wound field flux switching machines (WFFSMs). It leads to the generation of unstable field excitation, resulting in increased torque pulsations and losses. This article investigates the five phase non-overlapped WFFSMs to analyze and reduce the excitation winding induced EMF. The proposed machines combine the advantages of WFFSMs, non-overlapped windings, and the key benefits of multi-phase machines. The non-overlapped configuration of winding offers many advantages such as reduced copper losses, design simplicity, greater mechanical robustness, and simpler operation. The phenomena of the excitation winding induced EMF is briefly analyzed and explained. The harmonic orders of the excitation winding induced EMF are analytically derived and verified through finite element analysis (FEA). The on-load induced EMF is comprised of the induced EMF caused by the open circuit and armature reaction. Hence, three reduction techniques such as chamfering, rotor pole arc optimization and rotor pole axial pairing are applied and optimized to minimize the excitation winding induced EMF under on-load condition. The maximum reduction of 46.54% is achieved through rotor pole arc optimization, while rotor pole chamfering and rotor pole axial pairing yield reductions of up to 43.92% and 32.93%, respectively. Meanwhile, the average output torque is maintained over 90% of its initial value for all analyzed reduction techniques. Finally, prototypes for the WFFSMs with various rotor structures are fabricated to validate the results.