Patent ID: 7816836

Claim:
A reduced stress rotor, the rotor comprising: a shaft with a shaft axis; a pole extending radially outward from the shaft; a coil winding positioned on the pole; the pole having a planar pole face and a planar overhang face, the planar pole face oriented orthogonally with the planar overhang face, the planar overhang face oriented orthogonally with a radially outward force exerted by the coil winding, the coil winding oriented orthogonally against the planar overhang face by the radially outward force; and an intersection region between planes of the planar pole face and the planar overhang face comprising: a planar surface being distal the overhang face; a curvilinear space extending into the pole beyond the planar pole face; the curvilinear space having a surface intersecting tangentially with the planar overhang face and continuously and tangentially with the planar pole face, tangents taken at respective points of intersection being perpendicular to each other; wherein the coil winding directly abuts both the planar pole face and the planar overhang face.