<p>This paper proposes an improved core loss model for axial-modular flux-switching permanent-magnet (AM-FSPM) machines. Based on the harmonic analysis of core flux density, a dynamic Jiles-Atherton (J-A) hysteresis model is established by incorporating the influence of irreversible permanent-magnet (PM) demagnetization. The mechanism of local irreversible demagnetization (LID) is examined from a magnetic-circuit perspective. By iteratively computing the demagnetization-induced flux density distributions within the PMs, the corresponding variations in core magnetic flux density at key locations are obtained. Then, the dynamic J-A model is employed to accurately calculate the core losses of the AM-FSPM machine. Finally, a prototype is fabricated, and the effectiveness of the proposed core loss model is validated experimentally.</p>