Patent ID: 7800273

Claim:
An AC electric rotating machine comprising: a cylindrical stator core having plural slots; and a multi-phase stator coil that is housed in the plural slots of the cylindrical stator core, wherein the stator coil comprises: a belt-shaped winding band, the winding band including a plurality of conductor wires that are sequentially housed in the slots that are separated from each other by electric angle substantially π and which are aligned in parallel, and the winding band going around the stator core for two or more times while turning back in the axial direction at a pitch of electric angle substantially π, and a same-layer bridging portion, the same-layer bridging portion including a plurality of bridging conductor portions which are provided on an outer side of one end face of the stator core for connecting end portions of the same phase which are separated from each other by an electric angle π of end portions of each of the conductor wires, and the same-layer bridging portion being formed separately from the conductor wires of the winding band and joined to the end portion of the winding band or includes a part of the conductor wires of the winding band; wherein the bridging conductor portion of the same-layer bridging portion connects the end portions of the same phase of each of the conductor wires which are protruded from the same layer of each of the slots; and the conductor wire comprises: plural slot conductor portions which are sequentially housed in two different layers of the slots of the same phase which are separated from each other by electric angle π, and a different-layer bridging portion which communicates the end portions of a pair of the slot conductor portions which are housed in two different layers of the slots of the same phase which are separated from each other by electric angle π on the outer side in the axial direction of the stator core to form a coil end portion; wherein each of the bridging conductor portions of the same-layer bridging portion is arranged at a position overlapped in the axial direction with a protruded conductor portion formed of the end portion of the conductor wire protruded outwards in the axial direction, and extends at least in the circumferential direction; and wherein each of the bridging conductor portions has a substantially V-letter shape which includes a one half portion extending in one of the circumferential directions and inwards in the axial direction, and an other half portion extending in one of the circumferential directions and outwards in the axial direction from the end portion of the one half portion, and the one half portion and the other half portion of the bridging conductor portion extend separately from each other in the radial direction by an amount equal to thickness or more in the radial direction of the bridging conductor portion.