Rotor for an electric rotating machine

1. A rotor for an electric rotating machine, in particular a synchronous machine, said rotor comprising:

a shaft including a first contact surface having a profile; and

a pole shoe including a second contact surface having a profile configured to correspond to the profile of the first contact surface, said profile of the first contact surface bearing on the profile of the second contact surface in a positive, interlocking manner such as to establish a variation in height of the first and second contact surfaces in an axial direction,

wherein one member selected from the group consisting of the profile of the first contact surface and the profile of the second contact surface includes a toothed rack, and another member of the group includes a toothed rack slot, or

wherein one member selected from the group consisting of the profile of the first contact surface and the profile of the second contact surface includes a truncated pyramid, and another member of the group includes a truncated pyramid slot.

2. The rotor of claim 1 , wherein the profile of the first contact surface is sized to extend substantially over an entire axial length of the first contact surface, and the profile of the second contact surface is sized to extend substantially over an entire axial length of the second contact surface.

3. The rotor of claim 1 , wherein the profiles of the first and second contact surfaces have sloping side faces, with the first contact surface contacting the second contact surface in a region of the sloping side faces.

4. The rotor of claim 3 , wherein the sloping side faces of the profile of the first contact surface extend substantially parallel to the sloping side faces of the profile of the second contact surface, said first contact surface bearing on the second contact surface over an entire area in the region of the sloping side faces.

5. The rotor of claim 1 , wherein cavities are formed between the first contact surface and the second contact surface.

6. The rotor of claim 1 , wherein each of the profiles of the first and second contact surfaces is embodied as substantially redundant in the axial direction.

7. The rotor of claim 1 , wherein at least one of the first and second contact surfaces has a surface area with a surface roughness of more than 25 μm.

8. The rotor of claim 1 , wherein the toothed rack has a cross section substantially in a shape of a trapezoid, in particular an equilateral trapezoid.

9. An electric rotating machine, in particular a synchronous machine, comprising a rotor comprising a shaft including a first contact surface having a profile, and a pole shoe including a second contact surface having a profile configured to correspond to the profile of the first contact surface, said profile of the first contact surface bearing on the profile of the second contact surface in a positive, interlocking manner such as to establish a variation in height of the first and second contact surfaces in an axial direction, wherein one member selected from the group consisting of the profile of the first contact surface and the profile of the second contact surface includes a toothed rack, and another member of the group includes a toothed rack slot, or wherein one member selected from the group consisting of the profile of the first contact surface and the profile of the second contact surface includes a truncated pyramid, and another member of the group includes a truncated pyramid slot.

10. A method for producing a rotor for an electric rotating machine, in particular a synchronous machine, said method comprising:

configuring a first contact surface of a shaft with a profile;

configuring a second contact surface of a pole shoe with a profile in correspondence to the profile of the first contact surface;

bearing the profile of the first contact surface on the profile of the second contact surface in a positive, interlocking manner such as to establish a variation in height of the first and second contact surfaces in an axial direction,

wherein one member selected from the group consisting of the profile of the first contact surface and the profile of the second contact surface includes a toothed rack, and another member of the group includes a toothed rack slot, or wherein one member selected from the group consisting of the profile of the first contact surface and the profile of the second contact surface includes a truncated pyramid, and another member of the group includes a truncated pyramid slot.

11. The method of claim 10 , further comprising sizing the profile of the first contact surface to extend substantially over an entire axial length of the first contact surface, and sizing the profile of the second contact surface to extend substantially over an entire axial length of the second contact surface.

12. The method of claim 10 , further comprising forming the profiles of the first and second contact surfaces with sloping side faces, and placing the first and second contact surfaces such that the first contact surface contacts the second contact surface in a region of the sloping side faces.

13. The method of claim 12 , wherein the sloping side faces of the profile of the first contact surface extend substantially parallel to the sloping side faces of the profile of the second contact surface, with the first contact surface bearing on the second contact surface over an entire area in the region of the sloping side faces.

14. The method of claim 10 , further comprising forming cavities between the first contact surface and the second contact surface.

15. The method of claim 10 , wherein each of the profiles of the first and second contact surfaces is embodied as substantially redundant in the axial direction.

16. The method of claim 10 , wherein at least one of the first and second contact surfaces has a surface area with a surface roughness of more than 25 μm.

17. The method of claim 10 , wherein the toothed rack has a cross section substantially in a shape of a trapezoid, in particular an equilateral trapezoid.