Rotor for an electric machine having a sheet metal for securing a pole shoe to a shaft
The invention relates to a rotor ( 3 ) for an electric rotating machine ( 1 ), in particular a synchronous machine ( 20 ), comprising a shaft ( 5 ) and at least one pole shoe ( 7 ). In order to keep overhead and costs low while achieving high reliability, according to the invention, a metal sheet ( 8 ) is placed between the shaft ( 5 ) and the pole shoe ( 7 ); said metal sheet ( 8 ) has a first contact area ( 12 ) that is in contact with a contact area ( 14 ) on the pole shoe ( 7 ), the metal sheet ( 8 ) and the pole shoe ( 7 ) being made of different materials.
1. A rotor for an electric rotating machine, in particular a synchronous machine, said rotor comprising:
a shaft made of a first material;
a pole shoe made of a second material which is different than the first material; and
a metal sheet disposed between the shaft and the pole shoe and having a first contact area which is in contact with a contact area of the pole shoe, said first contact area of the metal sheet having a surface roughness which is greater than a surface roughness of the contact area of the pole shoe.
2. The rotor of claim 1 , wherein the first contact area of the metal sheet has a surface roughness of more than 25 μm.
3. The rotor of claim 1 , wherein the metal sheet is formed from a material having a hardness which is greater than a hardness of the pole shoe.
4. The rotor of claim 1 , wherein the metal sheet is formed from a spring steel with a hardness of at least 650 HV.
5. The rotor of claim 1 , wherein the metal sheet has a thickness of at least 2 mm.
6. The rotor of claim 1 , wherein the first contact area of the metal sheet is hi full surface contact with the contact area of the pole shoe.
7. The rotor of claim 1 , wherein the metal sheet is in contact with the shaft by way of a form-fit and/or force-fit connection, hi particular by way of a connecting element.
8. The rotor of claim 1 , wherein the metal sheet is connected to the shaft by way of a positive-fit connection.
9. The rotor of claim 1 , wherein the first contact area of the metal sheet has a surface roughness in a range of 60 μm to 80 μm.
10. The rotor of claim 1 , wherein the metal sheet is connected to the shaft by way of a welded connection.
11. A rotor for an electric rotating machine, in particular a synchronous machine, said rotor comprising:
a shaft made of a first material;
a pole shoe made of a second material which is different than the first material; and
a metal sheet disposed between the shaft and the pole shoe and having a first contact area which is in contact with a contact area of the pole shoe, said metal sheet having a second contact area which is in contact with a contact area of the shaft, said second contact area of the metal sheet having a surface roughness which is greater than a surface roughness of the contact area of the shaft.
12. The rotor of claim 11 , wherein the first contact area of the metal sheet has a surface roughness of more than 25 μm.
13. The rotor of claim 11 , wherein the metal sheet is formed from a material having a hardness which is greater than a hardness of the pole shoe.
14. The rotor of claim 11 , wherein the metal sheet is formed from a spring steel with a hardness of at least 650 HV.
15. The rotor of claim 11 , wherein the metal sheet has a thickness of at least 2 mm.
16. The rotor of claim 11 , wherein the first contact area of the metal sheet is in full surface contact with the contact area of the pole shoe.
17. The rotor of claim 11 , wherein the metal sheet is in contact with the shaft by way of a form-fit and/or force-fit connection, in particular by way of a connecting element.
18. The rotor of claim 11 , wherein the metal sheet is connected to the shaft by way of a positive-fit connection.
19. The rotor of claim 11 , wherein the first contact area of the meta/sheet has a surface roughness in a range of 60 μm to 80 μm.
20. The rotor of claim 11 , wherein the metal sheet is connected to the shaft by way of a welded connection.
21. An electric rotating machine, in particular a synchronous machine, comprising a rotor, said rotor comprising a shaft made of a first material, a pole shoe made of a second material which is different than the first material, and a metal sheet disposed between the shaft and the pole shoe and having a first contact area which is in contact with a contact area of the pole shoe, said first contact area of the metal sheet having a surface roughness which is greater than a surface roughness of the contact area of the pole shoe.
22. An electric rotating machine, in particular a synchronous machine, comprising a rotor, said rotor comprising a shaft made of a first material, a pole shoe made of a second material which is different than the first material, and a metal sheet disposed between the shaft and the pole shoe and having a first contact area which is in contact with a contact area of the pole shoe, said metal sheet having a second contact area which is in contact with a contact area of the shaft, said second contact area of the metal sheet having a surface roughness which is greater than a surface roughness of the contact area of the shaft.
23. A method for producing a rotor for an electric rotating machine, in particular a synchronous machine, said method comprising:
placing a metal sheet between a pole shoe and a shaft of the electric rotating machine, with the metal sheet and the pole shoe being produced from different materials; and
contacting a first contact area of the metal sheet with a contact area of the pole shoe, with the first contact area of the metal sheet having a surface roughness which is greater than a surface roughness of the contact area of the pole shoe.
24. The method of claim 23 , wherein the first contact area of the metal sheet has a surface roughness of more than 25 μm.
25. The method of claim 23 , wherein the metal sheet is formed from a material having a hardness which is greater than a hardness of the pole shoe.
26. The method of claim 23 , wherein the metal sheet is formed from a spring steel with a hardness of at least 650 HV.
27. The method of claim 23 , wherein the metal sheet has a thickness which is at least 2 mm.
28. The method of claim 23 , wherein the first contact area of the metal sheet is in full surface contact with the contact area of the pole shoe.
29. A method for producing a rotor for an electric rotating machine, in particular a synchronous machine, said method comprising:
placing a metal sheet between a pole shoe and a shaft of the electric rotating machine, with the metal sheet and the pole shoe being produced from different materials;
contacting a first contact area of the metal sheet with a contact area of the pole shoe; and
providing the metal sheet with a second contact area with a surface roughness which is greater than a surface roughness of a contact area of the shaft.
30. The method of claim 29 , wherein the first contact area of the metal sheet has a surface roughness of more than 25 μm.
31. The method of claim 29 , wherein the metal sheet is formed from a material having a hardness which is greater than a hardness of the pole shoe.
32. The method of claim 29 , wherein the metal sheet is formed from a spring steel with a hardness of at least 650 HV.
33. The method of claim 29 , wherein the metal sheet has a thickness which is at least 2 mm.
34. The method of claim 29 , wherein the first contact area of the metal sheet is in full surface contact with the contact area of the pole shoe.
35. The method of claim 29 , further comprising contacting a region of the second contact area of the metal sheet with the shaft by way of a form-fit and/or force-fit connection, in particular by way of a connecting element.
36. The method of claim 29 , further comprising connecting the second contact area of the metal sheet to the shaft by way of a positive-fit connection.