Enhancing Power Density in Switched Reluctance Generators Through Split Axial Segmentation

The main contribution of this paper is to propose a methodology for the electromagnetic design of axial split segmentation switched reluctance generators (SRGs) to optimize power and torque. This paper investigates the impact of generator geometry segmentation on performance, addressing the longstanding challenges of torque ripple and power density. The hypothesis suggests that dividing the stator magnetization at each rotor angle can counteract the opposing machine torque, thereby improving torque ripple and enhancing power density. A mixed-methods approach combining literature review, simulation, and experimental validation was used to evaluate torque retarding effects and machine power density. The results demonstrate a significant reduction in torque ripple (59.3%) and an increase in power density 603.3 <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">kW</i>/<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">m</i><sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> across all four segments. Specifically, axial separation segmentation markedly enhanced power density and design efficiency compared to conventional SRG designs. This paper provides novel insights into improving torque ripple and power output while maintaining the same overall machine dimensions at 1206.6 watts. Additionally, the simpler fabrication process of axial segmentation—where each segment maintains the same diameter—offers distinct advantages over radial segmentation, making it more practical for manufacturing. These findings highlight the potential for harvesting low-power driving energy from natural sources, contributing to advancing renewable energy technologies. So, the improvements in torque ripple reduction and power density provide valuable directions for optimizing SRGs, with further potential for enhancing driving turbine performance and utilizing better materials for greater energy harvesting efficiency.