Electric power collection and distribution ring, electric motor and method of manufacturing electric motor

1. An electric power collection and distribution ring, comprising:

a plurality of annular bus rings for collecting and distributing power to windings of a stator, the windings being covered with an insulation cover and the stator being formed by winding the windings around a plurality of teeth arranged in a circular pattern,

wherein the bus ring is formed by annularly coupling a plurality of arc-shaped conductive members each comprising terminal portions at both circumferential end portions, the terminal portions being welded to each other together with an end portion of the winding,

wherein the terminal portion comprises a first contact surface coming into contact with the end portion of the winding at the time of the welding and a second contact surface to be a contact point between the terminal portions, and

wherein the second contact surfaces are provided at two positions sandwiching the first contact surface.

2. The electric power collection and distribution ring according to claim 1 , wherein the conductive member integrally comprises an arc portion extending along a circumferential direction of the bus ring and the terminal portions, and wherein the terminal portions protrude with respect to the arc portion in a radial direction of the bus ring.

3. The electric power collection and distribution ring according to claim 1 , wherein the conductive member integrally comprises an arc portion extending along a circumferential direction of the bus ring and the terminal portions, and wherein the terminal portions extend from the arc portion along the circumferential direction of the bus ring.

4. The electric power collection and distribution ring according to claim 1 , wherein a width of the conductive member in an axial direction of the bus ring is smaller at the terminal portion than at the arc portion.

5. The electric power collection and distribution ring according to claim 1 , wherein a wiring is a rectangular wire having a rectangular cross section, and wherein the first contact surface is formed in a convex arc shape that protrudes toward the winding.

6. An electric motor, comprising: the electric power collection and distribution ring according to claim 1 ; the stator; and a rotor that is rotated with respect to the stator by a magnetic field of the winding.

7. An electric power collection and distribution ring, comprising:

a plurality of annular bus rings for collecting and distributing power to windings of a stator, the windings being covered with an insulation cover and the stator being formed by winding the windings around a plurality of teeth arranged in a circular pattern,

wherein the bus ring is formed by annularly coupling a plurality of arc-shaped conductive members each comprising terminal portions at both circumferential end portions, adjacent terminal portions being welded to each other together with an end portion of the winding, and

wherein the terminal portion comprises a first contact surface coming into contact with the end portion of the winding at the time of the welding and a second contact surface to be a contact point between the terminal portions,

wherein the end portion of the winding is inserted in a space between first contact surfaces of the adjacent terminal portions,

wherein the first contact surfaces of the adjacent terminal portions are welded to each other together with the end portion of the winding while second contact surfaces of the adjacent terminal portions are in contact with each other.

8. The electric power collection and distribution ring according to claim 7 , wherein the conductive member integrally comprises an arc portion extending along a circumferential direction of the bus ring and the terminal portions, and wherein the terminal portions protrude with respect to the arc portion in a radial direction of the bus ring.

9. The electric power collection and distribution ring according to claim 8 , wherein the first contact surface is provided closer to a tip end of the terminal portion than the second contact surface.

10. The electric power collection and distribution ring according to claim 8 , wherein the terminal portion comprises a curved portion on the arc portion side of the first and second contact surfaces, the curved portion being curved so as to protrude toward a circumferential middle portion of the arc portion.

11. The electric power collection and distribution ring according to claim 7 , wherein the conductive member integrally comprises an arc portion extending along a circumferential direction of the bus ring and the terminal portions, and wherein the terminal portions extend from the arc portion along the circumferential direction of the bus ring.

12. The electric power collection and distribution ring according to claim 7 , wherein the second contact surfaces are provided at two positions sandwiching the first contact surface.

13. The electric power collection and distribution ring according to claim 12 , wherein a width of the conductive member in an axial direction of the bus ring is smaller at the terminal portion than at the arc portion.

14. The electric power collection and distribution ring according to claim 7 , wherein the wiring is a rectangular wire having a rectangular cross section, and wherein the first contact surface is formed in a convex arc shape that protrudes toward the winding.

15. An electric motor, comprising: the electric power collection and distribution ring according to claim 7 ; the stator; and a rotor that is rotated with respect to the stator by a magnetic field of the winding.