Segmentation Method for the Design of Nonplanar Coils With REBCO Tapes for Superconducting Rotating Machines

High-temperature superconducting distributed windings in fully superconducting rotating machines offer lower AC losses, less higher harmonics, and higher power density but face challenges in non-planar coil design due to the mechanical limitation of the REBCO tapes. This paper presents a segmentation method for designing non-planar REBCO coils that meet geometric and mechanical limitations. To generate the non-planar coil shape, we selectively combine three types of segments: easy-way bending, twisting, and helix. To prevent critical current degradation of the tape, the constraints of the corresponding design parameters for each segment will be displayed. With this method, we report a design proposal of a non-planar coil shape for distributed double-layer windings in superconducting rotating machines.