Independent Field Excitation Control of an In-Wheel Wound-Field Flux-Switching Machine for Micro-Hybrid Applications

The tightening global emission regulations are com-pelling original equipment manufacturers and researchers to prioritize electrified solutions. In developing countries, fossfl fuel-powered vehicles are expected to continue being the primary choice for light-duty passenger vehicles in the medium term. It is crucial to recognize that micro and mild hybrid electric vehicles can make a significant contribution to reducing emissions and mitigating environmental impact. Electric machine designs with fewer or no rare-earth permanent magnets will play an important role in the widespread adoption of hybrid solutions. In this context, doubly salient reluctance machines exhibit a simple structure, robust mechanical strength, excellent fault tolerance, and a wide speed regulation range, making them well-suited for in-wheel applications. Particular emphasis should be placed on flux-switching ma-chines, 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. Firstly, the machine is reconfigured to enable independent control of field currents, with a dedicated test bench equipped for precise current control. The primary objective of this research is to enhance the machine's operational versatility by facilitating electronic adjustment of the number of poles, promoting balanced operation” and auamentina field-weakenina capabilities.