Rotating electrical machine and vehicle equipped with rotating electrical machine

1. A stator winding for a rotating electrical machine, comprising:

a plurality of stator phase windings assuming a plurality of phases, which each includes a plurality of round windings wound with a wave winding pattern, each having slot conductors each inserted at one of the slots at a stator core to form one of a plurality of layers and cross conductors each connecting same-side ends of slot conductors inserted at different slots so as to form a coil end, wherein:

the cross conductors connect the slot conductors so as to run astride slots with the slot pitch Np set to N+1 at coil ends on one side and run astride slots with the slot pitch Np set to N−1 at coil ends on another side, with N representing a number of slots per pole;

the stator phase windings each include stator winding groups that have no phase difference therebetween in a single phase;

the stator phase windings each includes a plurality of slot conductor groups each having a plurality of slot conductors corresponding to a single phase;

the plurality of slot conductors in each slot conductor group are inserted at a predetermined number Ns of successive slots forming a continuous range along a circumference of the stator core so that the slot conductors in the slot conductor group take successive slot positions and successive layer positions; and

the predetermined number Ns is set so that Ns=NSPP +NL when NSPP represents a number of slots per phase per pole and NL represents a number of layers divided by two.

2. The stator winding for a rotating electrical machine according to claim 1 , wherein:

the slot conductor groups each include NL slot conductors subgroups each formed by disposing slot conductors in a (2m−1)th layer and slot conductors in a 2mth layer with an offset relative to each other along the circumference of the stator core by a 1-slot pitch;

the NL slot conductor subgroups are disposed with a 1-slot pitch offset relative to one another along the circumference of the stator core; and

m=1, 2, . . . ,NL.

3. The stator winding for a rotating electrical machine according to claim 1 , wherein:

each of the stator phase windings includes a plurality of slot conductor groups, each having a plurality of slot conductors corresponding to a single phase, formed by disposing slot conductors to form a specific layer over a predetermined number NSPP of successive slots;

in each slot conductor group, slot conductors in a 2mth layer, counting from an inner circumferential side of the slots, are disposed with an offset relative to slot conductors in a first layer by an m-slot pitch in one direction running along a circumference of the stator core and slot conductors in a (2m−1)th layer, excluding the first layer, are disposed with an offset relative to the slot conductors in the first layer by an (m-1) slot pitch in the one direction; and

NSPP represents a number of slots per phase per pole, a number of layers is expressed as 2 ×NL and m=1,2, . . . , NL.

4. The stator winding for a rotating electrical machine according to claim 1 , wherein:

the round windings are each formed by connecting a plurality of segment conductors.

5. The stator winding for a rotating electrical machine according to claim 1 wherein:

the slot conductors are constituted with flat wire.

6. The stator winding for a rotating electrical machine according to claim 1 , wherein:

the stator phase windings include a plurality of Y connections and there is no phase difference manifesting between voltages induced at same-phase windings in the plurality of Y connections.

7. A stator, comprising:

the stator winding for a rotating electrical machine according to claim 1 ; and

a stator core having the slots at which the slot conductors are inserted.

8. The stator winding for a rotating electrical machine according to claim 1 , wherein:

all of the layer positions have slot conductors corresponding to a single phase.