This paper investigates the design principles and performance optimization for segmented-rotor switched reluctance motors (SRSRMs) with different rotor pole numbers for belt-driven starter generators of hybrid electric vehicles. For the design principles, several constraints are derived for the numbers of stator and rotor poles, the dimensions and the number of winding turns. Two SRSRMs with 16/10 and 16/14 stator/rotor poles are presented according to these principles. For the performance optimization, the two motors are optimized individually for maximizing the torque. To evaluate the effect of different segmented-rotor numbers, the overall performances of the two SRSRMs are investigated and compared. It is found that the 16/14 SRSRM has higher flux linkage and static torque. The 16/14 SRSRM exhibits higher torque and lower torque ripple at low speed operation. While at high speed, the 16/10 SRSRM performs better in torque and power densities. Compared with the 16/14 SRSRM, the 16/10 SRSRM has higher final steady speed under the same startup condition. The 16/10 SRSRM can achieve higher steady speed under starter mode, and provide higher generated power under braking mode. Moreover, the 16/10 SRSRM exhibits higher efficiency in the most feasible speed range, especially in high speed range, and it has wider high-efficiency area. Finally, a 16/10 SRSRM is prototyped and tested to validate the simulation results.

Due to the advantages such as high energy density, high power density, high cyclic-life, and environmentally friendly, flywheel have the potential to solve the problem of energy storage. In order to improve the torque density and suspension performance of bearingless synchronous permanent magnet synchronous motors (BPMSMs), a novel rotor structure with V-shape permanent magnets (PM) is designed in this paper. Furthermore, the IBPMSM with V-shape PM which used for flywheel batteries of electric vehicles (EVs) is researched in detail. Especially, the influence of geometrical parameters of V-shape PM on suspension force and electromagnetic torque is investigated. Moreover, the corresponding static electronic magnetic characteristics including inductances, electromagnetic torque is also studied. The finite-element method (FEM) is employed to evaluate the theoretical analysis of the proposed IBPMSM. In addition, the optimized motor is validated to have good suspension performance by some experiments.

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This paper proposes a fast-nonlinear modeling method for the direct torque control (DTC) of a segmented-rotor switched reluctance motor (SSRM) excluding the rotor clamping device. First, the torque-balanced method is used to measure the flux linkage values at five crucial positions. The flux linkage profile of the SSRM is represented by the fourth-order Fourier series based on the measured values. Then the Kriging model is employed to further describe flux linkage and torque characteristics based on the Fourier series. Combination of Fourier series and Kriging model can greatly incorporate their merits and improve the accuracy of the models. Compared with the conventional methods, the finite element analysis data are not required for the modeling process in the proposed method. Finally, simulation and experiments of the DTC and the current chopping control (CCC) methods bash on the modeling method are carried out. The amplitude of flux linkage under DTC can be well controlled while that under CCC is increased with the enlargement of load torque. Compared with CCC mode, DTC greatly reduces the torque ripple and exhibits the better speed response while the torque per ampere with CCC mode is higher.

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