Rotating electric machine

1. A rotating electric machine comprising:

a stator having a stator core that includes a yoke portion formed in the shape of a ring and a plurality of tooth portions extending from the yoke portion to the radial-direction inner side of the yoke portion and that contains a rotor in the inner space thereof;

a plurality of coils mounted on the plurality of tooth portions;

a connection member, formed in the shape of a ring, that is disposed on at least one axis-direction end of the stator and that mutually connects the plurality of coils so as to form a predetermined stator coil; and

a plurality of annular insulation holders, each of the plurality of annular insulation holders containing the connection member and comprising a first exterior surface that faces the stator and a second exterior side that opposes the first exterior surface,

wherein an axis-direction end face, at a stator-opposite side, of the connection member is formed in such a way that at a plurality of different positions in the radial direction of the connection member, axis-direction positions of the connection member differ from one another,

wherein the connection member has a diameter that is larger than the diameter of the stator core,

wherein at least a portion, of the connection member, that is situated at a position that is closest to an outer circumference thereof is at a stator core side in the axis direction with respect to the axis-direction end face of the stator, and

wherein the axis-direction end face of the plurality of annular insulation holders iswe shifted in a stepwise manner, at the stator side and the stator-opposite side, so that axis-direction positions of the first exterior surfaces of plurality of annular insulation holders are different from one another, and axis-direction positions of the second exterior surfaces of plurality of annular insulation holders are different from one another.

2. The rotating electric machine according to claim 1 ,

wherein the connection member comprises a plurality of bus bars that are held by the plurality of annular insulation holders at the different positions in the radial direction, and

wherein each of the plurality of bus bars is formed in the shape of a rectangle whose thickness direction extends in the radial direction and whose width direction extends in the axis direction.

3. The rotating electric machine according to claim 2 , wherein at least one of the plurality of bus bars is formed in such a way that the thickness and the width thereof differ from the thickness and the width of each of the other bus bars.

4. The rotating electric machine according to claim 2 , wherein the plurality of bus bars are formed in such a way that the respective thicknesses thereof differ from one another and the respective widths thereof differ from one another.

5. The rotating electric machine according to claim 2 , wherein the plurality of bus bars are formed in such a way that the more outward in the radial direction the bus bar is disposed, the larger the width thereof becomes.

6. The rotating electric machine according to claim 1 ,

wherein the connection member mutually connects the plurality of coils so as to form a three-phase Y-connection stator coil, and

wherein the plurality of bus bars include a U-phase bus bar, a V-phase bus bar, a W-phase bus bar, and a neutral-line bus bar.

7. The rotating electric machine according to claim 6 , wherein the neutral-line bus bar is disposed at a more outer position in the radial direction than any of the other bus bars is.

8. The rotating electric machine according to claim 1 , wherein through a water jacket disposed on the outer circumference portion of the stator, the connection member is fixed to a frame for fixing the stator.