Method of inserting multi-part tooth of an electric machine into a coil

1. A method of assembling a coil on an irregular-shaped multi-part tooth of an electric machine, comprising:

inserting at least one wedge-portion of the multi-part tooth into an opening of the coil such that a broader end of the at least one wedge-portion extends out of the opening in the coil, wherein the opening extends from a first end to a second end, and wherein

a width of the opening at the first end differs from the width of the opening at the second end,

a length of the opening at the first end differs from the length of the opening at the second end, and

a perimeter of the opening at the first end is substantially the same as the perimeter of the opening at the second end;

mounting the coil with the inserted at least one wedge-portion on a core tooth-portion of the multi-part tooth such that the broader end of the at least one wedge-portion remains extended out of the opening in the coil; and

exerting a force on the broader end of the at least one wedge-portion to tighten the coil on the multi-part tooth.

2. The method of claim 1 , wherein exerting a force on the broader end of the at least one wedge-portion includes pushing the broader end of the at least one wedge-portion into the opening in the coil.

3. The method of claim 1 , wherein inserting the at least one wedge-portion includes inserting the at least one wedge-portion into the opening such that the broader end extends out of the second end of the opening, and exerting the force includes pushing the broader end towards the first end of the opening.

4. The method of claim 1 , wherein a shape of the opening at the first end and the second end is rectangular.

5. The method of claim 1 , wherein an area of the opening at the first end varies from the area of the opening at the second end.

6. The method of claim 1 , wherein an area of the opening increases from the first end to the second end.

7. The method of claim 1 , wherein inserting the at least one wedge-portion into the opening of the coil includes inserting at least two wedge-portions into the opening.

8. The method of claim 7 , wherein mounting the coil includes mounting the coil on the core tooth-portion such that the core tooth-portion is disposed between the at least two wedge-portions.

9. The method of claim 8 , further including using an adhesive material to attach the at least two wedge-portions and the core tooth-portion of the multi-part tooth together.

10. The method of claim 1 , wherein the multi-part tooth is a part of a stator of the electric machine.

11. The method of claim 10 , wherein the core tooth-portion of the multi-part tooth is one of a plurality of core tooth-portions symmetrically arranged on an annular stator ring that extends around a central axis, and wherein the core tooth-portion extends outward in a radial direction from the annular stator ring.

12. The method of claim 11 , wherein the plurality of core tooth-portions are integrally formed with the annular stator ring.

13. The method of claim 11 , wherein, in a plane perpendicular to the central axis, the core tooth-portion has a substantially rectangular cross-sectional shape and the at least one wedge-portion has a substantially triangular cross-sectional shape.

14. The method of claim 11 , wherein, in a plane perpendicular to the radial direction, the core tooth-portion and the at least one wedge-portion have a substantially rectangular cross-sectional shape.

15. The method of claim 1 , wherein the coil includes a winding of a copper wire around the opening, the wire having one of a square, rectangular, or circular cross-sectional shape.

16. The method of claim 1 , wherein the coil includes a winding of a copper stranded wire in a spiral around the opening.

17. The method of claim 1 , wherein the electric machine is an electric motor.

18. The method of claim 1 , wherein the electric machine is an electric generator.

19. A method of assembling a coil on a multi-part tooth of an electric machine, wherein the multi-part tooth includes a core tooth-portion integrally formed with and extending radially from an annular stator ring extending around an axis of rotation of the electric machine, and at least one wedge-portion having a broader end and a narrower end formed separate from the core tooth-portion, the method comprising:

inserting the at least one wedge-portion of the multi-part tooth into an opening of the coil such that the broader end of the at least one wedge-portion extends out of a second end of the opening in the coil, wherein the opening extends from a first end to the second end, and wherein a cross-sectional area of the opening varies from the first end to the second end;

mounting the coil with the inserted at least one wedge-portion on the core tooth-portion of the multi-part tooth such that the broader end of the at least one wedge-portion remains extended out of the second end of the opening in the coil; and

moving the broader end of the at least one wedge-portion towards the first end of the opening.

20. The method of claim 19 , wherein the at least one wedge-portion of the multi-part tooth includes at least two wedge-portions, and wherein inserting the at least one wedge-portion into the opening of the coil includes inserting at least two wedge-portions into the opening.

21. The method of claim 19 , wherein moving the broader end towards the first end of the opening includes tightening the coil on the multi-part tooth.

22. The method of claim 19 , wherein the cross-sectional area of the opening increases from the first end to the second end.

23. The method of claim 19 , wherein the coil includes a winding of a copper wire around the opening, the wire having one of a square, rectangular, or circular cross-sectional shape.

24. The method of claim 19 , wherein the electric machine is an electric motor.

25. The method of claim 19 , wherein the electric machine is an electric generator.