Design and Analysis of Electric-Excitation Claw-Pole Field-Modulated Machine Considering Effective Harmonics

This paper proposes a novel electric-excitation claw-pole field-modulated (EECPFM) machine. Different from the conventional rotor-electric-excitation claw-pole machine, the excitation windings of the proposed machine are located in the stator, which improves the stability by the absence of brushes and commutators. Besides, the single ring-shaped excitation coil and armature windings are placed at different part of the stator, leading to less conflict of space. Meanwhile, the effective harmonic components are derived based on the theoretical analysis of air-gap magnetic field. By incorporating the air-gap field harmonic characteristics into structural parameter optimization design, the utilization of effective harmonics is raised and then the torque is further improved. Finally, the electromagnetic performances of proposed machine are evaluated and validated by the 3-dimensional finite element analysis (3D-FEA).