Armature coil for slotless rotary electric machinery

An armature coil for a rotary electric machinery such as electric generators and motors including a plurality of identical coil blocks each formed by a plurality of turns of an elongated conductor so as to correspond to different phases, characterized by that:

• each of said coil blocks includes two groups of axial sections which are diametrically opposed to each other and curved sections joining said two groups to each other at each axial end, the axial sections of one of said groups being disposed in an inner cylindrical layer while the axial sections of the other of said groups are disposed in an outer cylindrical layer which is coaxial with said inner cylindrical layer;
• and
• said coil blocks are combined with each other by circumferentially shifting one coil block from another in such a manner that said axial sections are arranged circumferentially along said inner and outer cylindrical layers one next to another.