access icon free Axial-flux permanent-magnet synchronous generator with coreless armature and non-integral coil–pole ratio

© The Institution of Engineering and Technology
Received 28/05/2018, Accepted 08/10/2018, Revised 03/09/2018, Published 19/10/2018

This article presents a study on an axial-flux permanent-magnet synchronous generator (AFPMSG) with a double-sided rotor, coreless armature. The armature winding consists of non-overlapping concentrated coils and has a non-integral coil–pole ratio. It is shown that, with an appropriate choice of armature coil number to pole number, the fundamental winding factor of the AFPMSG can be made close to that of a full-pitched integral slot winding. The field distribution and load performance are computed for a prototype machine based on a two-dimensional, time-stepping finite element method. A study of the armature reaction effect of the coreless armature winding and the origin of torque ripple is also carried out. The computed voltage and current waveforms, as well as the load characteristics, are verified by practical experiments.

Inspec keywords: permanent magnet generators; machine windings; coils; magnetic flux; synchronous generators; finite element analysis

Other keywords: nonintegral coil-pole ratio; field distribution; coreless armature winding; load performance; computed current waveform; double-sided rotor; fundamental winding factor; load characteristics; time-stepping finite element method; AFPMSG; computed voltage waveform; axial-flux permanent-magnet synchronous generator; two-dimensional finite element method; armature coil number; armature reaction effect; nonoverlapping concentrated coils; torque ripple; pole number; full-pitched integral slot winding

Subjects: Synchronous machines; Finite element analysis; Inductors and transformers

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