Stator and rotating electric machine

A rotating electric machine, comprising:

• a stator including
• a stator core with N pieces of slots ranging along an axial direction, which are formed side-by-side along a circumferential direction;
• and
• a stator winding installed in the slots at the stator winding, wherein:
• the stator winding includes a plurality of winding groups, each made up with N pieces of lap-wound coils each formed by winding a conductor wire a plurality of times:
• the winding groups are disposed in a plurality of layers set side-by-side along a radial direction at the stator core;
• and
• one coil side at each of the lap-wound coils is inserted in a specific slot on an inner side along the radial direction in a specific layer and another coil side of the lap-wound coil is inserted in another slot on an outer side along the radial direction in the specific layer;
• a rotor rotatably disposed on an inner circumferential side of the stator with a gap setting the rotor apart from the stator, wherein:
• the rotating electric machine is driven with three-phase AC power, and
• when the winding groups, each corresponding to different phases, are made up with n pieces of coil windings Ui, n pieces of coil windings Vi and n pieces of coil windings Wi (i=1˜n), a total of the plurality of layers is n and the plurality of winding groups are notated as Lj (j=1˜n), n pieces of winding groups Lj, each made up with a coil winding Ui, a coil winding Vi and a core winding Wi, are wound over the n layers, starting from an inner circumferential side toward an outer circumferential side at the stator core.