ABSTRACT This paper investigates the impact of sleeve segmentation on eddy‐current loss in permanent‐magnet (PM) machines with fractional‐slot concentrated‐windings (FSCW) under different stator MMF harmonics. The concept of equivalent sleeve segmentation is introduced. The eddy‐current path induced by the v ‐order armature reaction magnetic field harmonic in the sleeve is divided into v spatial segments. First, the effect factors of EC losses of FSCW‐PM machines, including stator magneto‐motive force (MMF) harmonics, armature reaction magnetic field, and EC density, are analyzed in detail. Then, a 12s10p and a 24s22p PM machines are design optimal and their performances are calculated by the finite‐element method. The results show that the equivalent segmentation of harmonics significantly affects eddy‐current losses. Finally, some experiments on the prototype of the 12s10p FSCW‐PM machine are carried out for validation.
Zhao et al. (Thu,) studied this question.