Abstract
In this study, we analyzed a novel axial-gap type machine that transfers electric energy via magnetic resonance coupling so as to develop an ultra-lightweight motor for electric aircrafts. The magnetic resonance between the multiphase stator and the rotor windings facilitates wireless power transfer without magnetic cores, thereby considerably reducing the motor weight. In this paper, we described the basic characteristics of such axial-gap machines and discussed the effects of the different number of poles. In addition, we analyzed the machine’s characteristics using magnetic field analysis via the finite-element method. The obtained results indicated that the axial-gap machine, which has two poles, has the ability to efficiently achieve high-power density. Moreover, the influence of the number of poles on the motor’s performance was revealed. The simulation results also confirmed that the axial-gap machine can demonstrate a power density output of 16.5 kW/kg with a power factor of 1.0.
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