Abstract: An air-core armature for electrodynamic machines comprises an elongated insulating strip rolled up to form a spiral structure composed of a plurality of radially successive layers. An armature winding is comprised of at least one armature coil. The armature coil is comprised of a plurality of electrically interconnected (e.g., series connected or parallel-connected) component coils. Each of the component coils is formed of electrically interconnected conductor sections printed on both sides of the insulating strip. The component coils are located on different respective ones of the radially successive layers of the spiral structure, but occupy substantially the same circumferential sector of the spiral structure, and accordingly are substantially juxtaposed in direction radially of the spiral structure.