Winding eddy current loss of FPCB helical winding slotless PMSMs

To solve the limitations of the current two-dimensional (2D) solution method and the high modeling complexity and lengthy calculation time of the existing three-dimensional (3D) analysis method, a fast winding eddy current loss analysis model for the flexible printed circuit board (FPCB) helical winding slotless permanent magnet synchronous motors (PMSMs) is established in this paper. First, the impact of the winding end connection state on the eddy current distribution is examined using the 3D finite element method (FEM). Subsequently, the eddy current distribution with different times in the single-sided conductor are analyzed employing the same method. Then, the winding eddy current loss of the FPCB helical winding slotless PMSM is calculated using the segmented calculation method and the superposition of the magnetic flux of a single loop and the superposition of all loops. Finally, a prototype is constructed to experimentally evaluate the winding eddy current loss of the proposed FPCB helical winding slotless PMSM. Experiment verify the correctness of the proposed model.