Analysis of AC Losses in Flat-Wire Windings of Dual-Rotor Axial-Flux PM Machines With Segmented Stators

This paper investigates the distribution patterns and influencing factors of AC losses in the flat-wire windings of an axial-flux permanent magnet machine (AFPMM) with dual rotor and segmented stators (DRSS). Firstly, several two- and three-dimensional computational models considering eddy current effects are established to balance accuracy and speed. The dimensions of the stator core, including parameters such as slot openings, slot widths, and slot heights, are analyzed and optimized employing the optimal model. Then, the effects of conductor arrangement, wire gauge, stranding, and frequency on AC losses are studied by applying the three proposed configurations for flat-wire windings. A comparison of eddy current distribution and AC losses per turn is presented. Finally, methods for suppressing AC losses in the flat-wire winding of the AFPMM-DRSS are discussed.