Superconducting coil, rotating device, and superconducting coil manufacturing method

A superconducting coil manufacturing method comprising the steps of:

• preparing a base having a cylindrical surface;
• arranging a race-track-like winding frame having a saddle shape on the cylindrical surface of the base;
• and
• winding a superconducting wire on the cylindrical surface of the base along the winding frame,
• wherein the winding frame has a curved portion and a straight position connected to the curved portion,
• wherein, in the curved portion, an upper edge is positioned closer to an inner peripheral side than a lower edge is, and in the straight position, the upper edge is positioned closer to the outer peripheral side than the lower edge is, and
• wherein an inclination of side surfaces of the winding frame gradually changes between the curved portion and the straight portion so as to cancel out an edgewise bending component and so that a length of the upper edge is the same as a length of the lower edge.