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Vector-controlled permanent magnet machine with open-winding structure can realize voltage regulation over a wide speed range and improve the generator power factor as well as the system integration degree when used in Hybrid Electric Vehicles (HEV). However, it is difficult for the above system to control the energy distribution between the battery and the engine. Hence, in order to realize the energy distribution control in multi-energy powertrain of HEV, a hybrid excitation generator system with open-winding structure is investigated in this paper and a double closed-loop control of battery current and generator excitation current is employed. Simulation results demonstrate the feasibility and effectiveness of the energy distribution control scheme.

Parallel hybrid excited flux-switching machine combines the advantages of permanent magnet flux-switching machine and electrical excitation flux-switching machine with the controllability of magnetic flux by auxiliary field windings and high torque density. However, influenced by the armature winding inductance of electrical excitation part, output characteristic of the parallel hybrid excited machine is greatly reduced. Hence, another winding form is adopted for electrical excitation flux-switching machine in this paper. It can greatly reduce the armature winding inductance with the magnetic regulation ability unchanged and the comparison is given in details. Moreover, this paper comparatively studies on the electromagnetic performance of four topologies of parallel hybrid excited flux-switching machine and provides reference for the selection of parallel hybrid excited flux-switching topologies.

The linear flux switching permanent magnet (LFSPM) machine, with both the PMs and armature windings located on the short mover and the long iron-core only stator, is suitable for urban rail transit applications. However, this kind of machine exhibits relatively large cogging force. A cogging force reduction method based on a twisted-stator structure is investigated in this paper and the twisted angle is analyzed with emphasize on its influence on the flux-linkage magnitude and the cogging force reduction by finite-element analysis (FEA). Besides, flux-linkage and the cogging force of two modular LFSPM (MLFSPM) machines with and without structure optimization are compared, respectively.

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A novel parallel permanent magnet fluxswitching motor with trapezoidal back EMF is presented in this paper. This structure inherits the advantages of flux-switching motor, e.g. salient and robust rotor, strong flux-weakening capability and also has superiority in high speed sensorless control for its trapezoidal back EMF like brushless DC (BLDC) motor. Based on motor topology, this paper makes a detailed analysis on the motor flux-linkage and back EMF and focuses on comparing the performance of the motor with different stator and rotor pole numbers. The results of comparison are confirmed by finite element and MATLAB simulation. Keywords-permanent magnet flux-switching motor; brushless DC (BLDC) motor; flux-weakening capability; parallel permanent magnet flux-switching motorI.