High-Harmonic Injection-Based Brushless Wound Field Synchronous Machine Topology

Syed Sabir Hussain Bukhari, Fareed Hussain Mangi, Irfan Sami, Qasim Ali and Jong-Suk Ro
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Syed Sabir Hussain Bukhari: Department of Electrical Engineering, Sukkur IBA University, Sukkur 65200, Sindh, Pakistan
Fareed Hussain Mangi: Department of Electrical Engineering, Sukkur IBA University, Sukkur 65200, Sindh, Pakistan
Irfan Sami: School of Electrical and Electronics Engineering, Chung-Ang University, Seoul 06910, Korea
Qasim Ali: Department of Electrical Engineering, Sukkur IBA University, Sukkur 65200, Sindh, Pakistan
Jong-Suk Ro: School of Electrical and Electronics Engineering, Chung-Ang University, Seoul 06910, Korea

Mathematics, 2021, vol. 9, issue 15, 1-16

Abstract: This paper discusses the design and analysis of a high-harmonic injection-based field excitation scheme for the brushless operation of wound field synchronous machines (WFSMs) in order to achieve a higher efficiency. The proposed scheme involves two inverters. One of these inverters provides the three-phase fundamental-harmonic current to the armature winding, whereas the second inverter injects the single-phase high-harmonic i.e., 6 th harmonic current in this case, to the neutral-point of the Y-connected armature winding. The injection of the high-harmonic current in the armature winding develops the high-harmonic magnetomotive force (MMF) in the air gap of the machine beside the fundamental. The high-harmonic MMF induces the harmonic current in the excitation winding of the rotor, whereas the fundamental MMF develops the main armature field. The harmonic current is rectified to inject the direct current (DC) into the main rotor field winding. The main armature and rotor fields, when interacting with each other, produce torque. Finite element analysis (FEA) is carried out in order to develop a 4-pole 24-slot machine and investigate it using a 6 th harmonic current injection for the rotor field excitation to both attain a brushless operation and analyze its electromagnetic performance. Later on, the performance of the proposed topology is compared with the typical brushless WFSM topology employing the 3 rd harmonic current injection-based field excitation scheme.

Keywords: high-harmonic injection; brushless field excitation; wound field synchronous machines (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2021
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