Motor, stator, and method for manufacturing stator

1. A stator comprising:

a stator core that includes a plurality of split core pieces each having a tooth portion, the split core pieces being annularly arranged such that distal ends of the tooth portions face radially inward; and

a plurality of coils each wound about one of the tooth portions, the coils are divided into groups of n phases;

wherein a lead wire is continuously wound about an adjacent pair of the tooth portions such that coils of different phases are formed in the circumferentially adjacent tooth portions, so that a plurality of connecting wires are provided, each connecting wire connecting coils of different phases, and

wherein either the connecting wires are connected to each other or the connecting wires are connected to each other in a state where at least one of the connecting wires is cut, such that a neutral point is created.

2. The stator according to claim 1 , wherein at least one of the connecting wires is formed into a ring extending along the circumferential direction of the stator.

3. The stator according to claim 2 , wherein the coils include a U-phase coil, a V-phase coil, and a W-phase coil, and

wherein the connecting wires include a U-phase-to-V-phase connecting wire connecting the U-phase coil and the V-phase coil, a V-phase-to-W-phase connecting wire connecting the V-phase coil and the W-phase coil, and a W-phase-to-U-phase connecting wire connecting the W-phase coil and the U-phase coil.

4. The stator according to claim 3 , wherein at least one of the U-phase-to-V-phase connecting wire, the V-phase-to-W-phase connecting wire, and the W-phase-to-U-phase connecting wire is formed into a ring extending along the circumferential direction of the stator.

5. The stator according to claim 3 , wherein one of the U-phase-to-V-phase connecting wire, the V-phase-to-W-phase connecting wire, and the W-phase-to-U-phase connecting wire is formed into a ring extending along the circumferential direction of the stator.

6. The stator according to claim 3 , wherein at least one of the U-phase-to-V-phase connecting wire, the V-phase-to-W-phase connecting wire, and the W-phase-to-U-phase connecting wire is arched and extends to a circumferentially adjacent one of the connecting wires.

7. The stator according to claim 3 , wherein two of the U-phase-to-V-phase connecting wire, the V-phase-to-W-phase connecting wire, and the W-phase-to-U-phase connecting wire are arched and extend to the other connecting wire, and

wherein the U-phase-to-V-phase connecting wire, the V-phase-to-W-phase connecting wire, and the W-phase-to-U-phase connecting wire are electrically connected to one another by a single connecting member.

8. The stator according to claim 3 , wherein the connecting wires extend substantially parallel with an end face of the stator in the axial direction, wherein the connecting wires are electrically connected to one another by welding or the connecting wires and other conductive members are electrically connected to each other by welding, and joint portions formed by the welding are located in a part of the connecting wires or of said other conductive members, which part does not face the end face of the stator in the axial direction.

9. The stator according to claim 8 , wherein the joint between the connecting wires or the joint between the connecting wires and said other conductive members is achieved by connecting members at the joint portions.

10. The stator according to claim 8 , wherein the connecting wires and the connecting members are joined by laser welding.