This paper proposes a novel 16/10 segmented rotor switched reluctance machine (SSRM) for belt-driven starter generators (BSGs) of hybrid electric vehicles. The stator of proposed SSRM consists of two types of stator poles: exciting pole and auxiliary pole, and the rotor of proposed SSRM is made up of a series of discrete segments. Firstly, the concept of the conventional SRM and proposed machine is presented. Secondly, the design rules of proposed SSRM are described. Finally, the finite element method (FEM) is employed to get the static characteristics of the proposed SSRM, including the magnetic flux distribution, magnetic flux density, inductance characteristic, torque characteristic and continuous torque. Result shows that the torque ripple of proposed SSRM is low. Index Terms-Segmented rotor; exciting and auxiliary poles; discrete segments; static characteristics; finite element method, torque ripple.

Purpose Inductance, torque and iron loss are the key parameters of switched reluctance motors for belt-driven starter generators. This paper aims to present the analysis of a segmented rotor switched reluctance motor (SSRM) with three types of winding connections for hybrid electric vehicle applications by using a two-dimensional finite element method. Design/methodology/approach The rotor of the studied SSRM consists of a series of discrete segments, while the stator is made up of exciting and auxiliary teeth. First, the concept and structures of the different winding connections are introduced. Then, the magnetic flux path of the three types of winding connections for the SSRM is described. Second, the magnetic flux distributions in the three parts, i.e. the stator yoke, the stator tooth and the rotor segment, are described in detail to calculate the iron losses. Third, three SSRMs with the different winding arrangements are analyzed and compared to evaluate the distinct features of the studied SSRM. The analysis and comparison mainly include self-inductances, mutual inductances, phase currents, output torque and iron loss. Findings It is found that the self-inductances of the three types of winding connections are almost equal, and only the SSRM1 has a positive mutual inductance. In addition, the current waveforms of SSRM1 and SSRM2 are regular. However, it is irregular in SSRM3. It is shown that SSRM1 has better characteristics, such as higher output torque, high power density, lower torque ripple and iron loss. Originality/value This paper proposes and analyzes three novel winding connections for the SSRM to provide guidance for enhancing the output torque and reducing the iron loss to achieve high efficiency.

：To overcome the inherent defects of conventional switched reluctance motor (SRM), a new type of fault-tolerant segmented rotor SRM for the belt-driven starter generator (BSG) of HEVs is proposed, and then its electromagnetic characteristics are analyzed. Firstly, in order to improve the output torque of the new fault-tolerant segmented rotor SRM, the key structural parameters affecting the motor output torque are optimized, and the static and dynamic characteristics of the optimized motor are analyzed. Secondly, to study the fault-tolerant performance of the proposed motor, the characteristics of mutual inductance and fault tolerance features in case of a phase failure of the conventional SRM and fault-tolerant segmented rotor SRM are compared. Finally, an experimental prototype is designed and fabricated to verify the static characteristics. In addition, experimental studies on the prototype motor were carried out when it operated under the load operation. Both the simulated and experimental results reveal that the output torque of optimized fault-tolerant segmented rotor SRM was larger than that of the motor before optimization. Moreover, its dynamic and fault tolerance performances were better than those of the conventional SRM. Through the optimization and fault tolerance analysis of the fault-tolerant segmented rotor SRM, theoretical guidance for the design of BSG motors with safe and reliable characteristics is provided.