Current Control in Field-Excited Flux Switching Machines: No-Load Induced Voltage Impact Based on the Winding Connection

Diogo P. V. Galo; Thales A. C. Maia; Braz de J. Cardoso Filho

doi:10.18618/REP.e202515

Authors

Diogo P. V. Galo Universidade Federal de Minas Gerais https://orcid.org/0000-0001-6868-4304
Thales A. C. Maia Universidade Federal de Minas Gerais https://orcid.org/0000-0001-7943-6322
Braz de J. Cardoso Filho Universidade Federal de Minas Gerais https://orcid.org/0000-0002-3470-4570

DOI:

https://doi.org/10.18618/REP.e202515

Keywords:

Would-field flux-switching machine, in-wheel drives, hybrid electric vehicles, independent field current control

Abstract

Micro and mild hybrid electric vehicles can make a significant contribution to reducing emissions and mitigating the environmental impact. Electric machine designs with fewer or no rare-earth permanent magnets will play an important role in the adoption of hybrid solutions. Doubly salient reluctance machines exhibit a simple structure, robust mechanical strength, excellent fault tolerance, and a wide range of speed regulation, which makes them suitable for in-wheel applications. Particular emphasis should be placed on flux-switching machines with wound-field excitation, which offer great operating flexibility, efficient heat dissipation, and power density of up to 4.8 kW/kg. This paper introduces a wound-field flux-switching machine designed for in-wheel applications, featuring individual field current control. The machine has individual access to each of the field coils. The primary objective of this research is to enhance the machine's operational versatility by enabling multiple configurations of the machine, adjusting the way the field-coils are connected. Firstly, a comparison of the armature no-load induced voltage is made for field coils connected in both series and parallel. Additionally, an assessment of the impact of open-circuit failures in one and two adjacent field coils is conducted. Finally, a current control strategy is proposed to effectively manage each individual field coil.

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Author Biographies

Diogo P. V. Galo, Universidade Federal de Minas Gerais

born in Brazil in 1989 and is an electrical engineer (2015), master (2018) with Universidade Federal de São João del Rei and is a Ph.D. candidate at Universidade Federal de Minas Gerais. His areas of interest are electrical machines and drives, power electronics and vehicular electrification.

Thales A. C. Maia, Universidade Federal de Minas Gerais

was born in Brazil in 1984. He received the Ph.D. degree in mechanical engineering from the Universidade Federal de Minas Gerais, Belo Horizonte, Brazil, in 2016.,Since 2009, he has been an Electrical Engineer. His main working fields include electrical machine design and power electronics. He is an Assistant Professor with the Department of Electric Engineering, Universidade Federal de Minas Gerais.

Braz de J. Cardoso Filho, Universidade Federal de Minas Gerais

Braz de Jesus Cardoso Filho received the electrical engineer and master of electrical engineering degrees from the Universidade Federal de Minas Gerais, Belo Horizonte, Brazil, in 1988 and 1991, respectively, and the Ph.D. degree in electrical engineering from the University of Wisconsin.Madison, Madison, WI, USA, in 1998.,Since 1989, he has been in a faculty position with the Department of Electrical Engineering, School of Engineering, Universidade Federal de Minas Gerais, where he is currently a Professor of electrical engineering. He is the Founder and Head of the TESLA Power Engineering Laboratory (formerly the Industry Application Laboratory), Universidade Federal de Minas Gerais. He has authored or coauthored more than 200 technical papers on the topics of power electronics and electrical drives, and holds nine patents and patent applications. His research interests include utility applications of power electronics, renewable energy sources, semiconductor power devices, electrical machines and drives, and vehicle electrification.

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