Research On Enhanced Harmonic Effect of a Dual-PM-Excited Flux-Modulated Motor

Abstract

In this paper, an improved design for a dual-permanent-magnet-excited (DPME) motor is proposed, where the harmonic characteristics are newly introduced into the design process to enhance the harmonic effect. Based on the role that harmonics play in the torque generation process, not only the amplitude characteristics of harmonics are considered, but also the phase characteristics of harmonics are introduced, which is the key to improve PM utilization. In addition, the harmonics excited by stator PM (SPM) source or rotor PM (RPM) source are considered separately due to the unique dual-PM source characteristic of the DPME motor, which can further enhance the amplitude and phase characteristics of harmonics and then improve the PM utilization. Firstly, the dominant harmonics excited by SPM or RPM are picked out with the analysis of amplitude characteristics. Then, by taking into account the phase characteristics, the effective harmonics excited by SPM or RPM are selected within the dominant harmonics and serve as design objectives. After that, a collaborative design can be realized with the parameters and the two harmonic characteristics of effective harmonics. Finally, the electromagnetic performances are investigated by the Finite Element Analysis (FEA), and the results verify the effectiveness of the design considering harmonic characteristics of dual-PM sources.