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Article

High-Efficient Brushless Wound Rotor Synchronous Machine Topology Based on Sub-Harmonic Field-Excitation Technique

1
Department of Electrical Engineering, Sukkur IBA University, Sukkur 65200, Pakistan
2
School of Electrical and Electronics Engineering, Chung-Ang University, Seoul 06910, Korea
3
Applied Power Electronics Technology Research Group, University of Vigo, 36310 Vigo, Spain
4
Department of Intelligent Energy and Industry, Chung-Ang University, Seoul 06910, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Dan-Cristian Popa
Energies 2021, 14(15), 4427; https://doi.org/10.3390/en14154427
Received: 7 June 2021 / Revised: 14 July 2021 / Accepted: 21 July 2021 / Published: 22 July 2021
This paper presents a new high-efficient three-phase brushless wound rotor synchronous machine (BL-WRSM) based on a sub-harmonic field excitation technique. In the proposed machine topology, the stator is equipped with two different three-phase windings: (1) main armature winding, and (2) additional armature winding. The main armature winding is based on a 4-pole winding configuration, whereas the additional armature winding is based on a 2-pole winding configuration. Both windings are supplied current from two different inverters, i.e., inverter-1, inverter-2, and simultaneously. Inverter-1 provides the regular input current to the main armature winding, whereas inverter-2 provides a three-phase current of low magnitude to the 2-pole additional armature winding. This generates an additional sub-harmonic component of MMF in the airgap beside the fundamental MMF. On the other side, the rotor is equipped with (1) harmonic, and (2) field windings. These windings are electrically coupled via a rectifier. The fundamental component of MMF produces the main rotating magnetic field, whereas the sub-harmonic MMF gets induced in the harmonic winding to produce harmonic current. This current is rectified to give DC to the rotor field winding to attain brushless operation. To authenticate the operation and analyze its performance, the proposed BL-WRSM topology is supported using 2-D finite element analysis (FEA) in JMAG-Designer. Later on, the performance of the proposed brushless topology is compared with the customary BL-WRSM topology to verify its high efficiency, high output torque, low torque ripple, and low unbalanced radial force on the rotor. View Full-Text
Keywords: sub-harmonic field excitation; brushless operation; synchronous motor sub-harmonic field excitation; brushless operation; synchronous motor
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MDPI and ACS Style

Bukhari, S.S.H.; Ali, Q.; Doval-Gandoy, J.; Ro, J.-S. High-Efficient Brushless Wound Rotor Synchronous Machine Topology Based on Sub-Harmonic Field-Excitation Technique. Energies 2021, 14, 4427. https://doi.org/10.3390/en14154427

AMA Style

Bukhari SSH, Ali Q, Doval-Gandoy J, Ro J-S. High-Efficient Brushless Wound Rotor Synchronous Machine Topology Based on Sub-Harmonic Field-Excitation Technique. Energies. 2021; 14(15):4427. https://doi.org/10.3390/en14154427

Chicago/Turabian Style

Bukhari, Syed S.H., Qasim Ali, Jesús Doval-Gandoy, and Jong-Suk Ro. 2021. "High-Efficient Brushless Wound Rotor Synchronous Machine Topology Based on Sub-Harmonic Field-Excitation Technique" Energies 14, no. 15: 4427. https://doi.org/10.3390/en14154427

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