Composite electric machine

1. A method for producing an annular active part of an electric machine for a mill drive or a wind power plant, the annular active part surrounding ring-segment-shaped sections comprising grooves for receiving electric conductors, the method comprising:

forming the ring-segment-shaped sections comprising the grooves;

providing at least two galvanically separated electric conductors in each case, each electric conductor being configured to be arranged in at least two different grooves of a respective formed ring-segment-shaped section, extending in opposite directions;

insulating a respective electric conductor via a respective electrically insulating insulation layer;

impregnating the respective electrically insulating insulation layer of each respective electric conductor with an impregnant;

inserting the respective electrically insulated and impregnated electric conductor into the at least two different grooves of the respective formed ring-segment-shaped section;

electrically connecting the respective electric conductor of the respective formed ring-segment-shaped section to a respective section conductor rail before the transportation of the respective formed ring-segment-shaped section such that the respective formed ring-segment-shaped section is operable by applying a voltage to the respective section conductor rail;

transporting the respective formed ring-segment-shaped section, including the respective electric conductors inserted therein, to at least one of an assembly location and an operating location of the electric machine; and

assembling the annular active part of the electric machine by joining at least two of the ring-segment-shaped sections comprising grooves aided by at least one respective connection.

2. The method as claimed in claim 1 , wherein the respective section conductor rail is directly connected to a respective connection point of the electric machine during assembly of the annular active part.

3. The method as claimed in claim 1 , wherein the annular active part includes at least two ring-segment-shaped segments; and

wherein at least two of the ring-segment-shaped sections are connected to a respective segment via a respective connection during assembly of the annular active part.

4. The method as claimed in claim 3 , wherein the respective electric conductor of the respective ring-segment-shaped section is electrically connected to a respective segment conductor rail during assembly of the active part such that the electric conductors of a respective segment is operable by applying a voltage to the respective segment conductor rail.

5. The method as claimed in claim 4 , wherein the respective section conductor rail is connected to the respective segment conductor rail during assembly of the annular active part.

6. The method as claimed in claim 4 , wherein the respective section conductor rail is formed as a unitary part with the respective segment conductor rail.

7. The method as claimed in claim 3 , wherein the respective segment conductor rail is directly connected to the respective connection point of the electric machine during assembly.

8. The method as claimed in claim 1 , wherein the respective electric conductors of at least two different ring-segment-shaped segments are connected together via the respective section conductor rail or via the respective segment conductor rail during assembly of the active part; and

wherein the respective section conductor rail or the respective segment conductor rail is connected to a respective connection point of the electric machine during assembly.

9. The method as claimed in claim 1 , wherein said providing galvanically separated electric conductors comprises providing at least three galvanically separated electric conductors.

10. The method as claimed in claim 1 , wherein the annular active part includes at least four ring-segment-shaped segments.

11. A ring-segment-shaped section surrounded by an annular active part of an electric machine for a mill drive, comprising:

grooves for receiving electric conductors;

at least two galvanically separated electric conductors;

a respective electrically insulating insulation layer which electrically insulates a respective galvanically separated electric conductor; and

a respective section conductor rail;

wherein the respective electrically insulating insulation layer of the respective galvanically separated electric conductor is impregnated with an impregnant;

wherein the respective insulated and impregnated galvanically separated electric conductor is arranged in at least two different grooves of the respective ring-segment-shaped section surrounded by the annular active part of the electric machine, extending in opposite directions; and

wherein the respective section conductor rail is electrically connected to the respective galvanically separated electric conductor of the respective ring-segment-shaped section before transportation of the respective ring-segment-shaped section such that the respective ring-segment-shaped section is operable by applying a voltage to the respective section conductor rail.

12. The ring-segment-shaped section as claimed in claim 11 , wherein the at least two galvanically separated electric conductors are formed such that at least two magnetic poles are formed when a voltage is applied to the respective electric conductor.

13. The ring-segment-shaped section as claimed in claim 11 ;

wherein the respective galvanically separated electric conductor is configured as a preformed coil; and

wherein at least one of (i) at least one electric conductor of the galvanically separated electric conductor is cranked outwards in a radial direction and (ii) at least one of the electric conductors is cranked inwards in the radial direction.

14. The ring-segment-shaped section as claimed in claim 12 ;

wherein the respective galvanically separated electric conductor is configured as a preformed coil; and

wherein at least one of (i) at least one electric conductor of the galvanically separated electric conductor is cranked outwards in a radial direction and (ii) at least one of the electric conductors is cranked inwards in the radial direction.

15. The ring-segment-shaped section as claimed in claim 11 , wherein the ring-segment-shaped section includes at least three galvanically separated electric conductors.

16. The ring-segment-shaped section as claimed in claim 12 , wherein at least three, magnetic poles are formed when the voltage is applied to the respective electric conductor.

17. An electric machine for a mill drive or a wind power plant, comprising at least one ring-segment-shaped section as claimed in claim 11 .

18. A mill or wind power plant comprising the electric machine as claimed in claim 17 .

19. A service method for an electric machine including ring-segment-shaped sections surrounded by an annular active part for a mill drive or a wind power plant, comprising:

providing at least one ring-segment-shaped section, in addition to the ring-segment-shaped sections of the electric machine, in a vicinity of an operating location of the electric machine, the at least one additionally provided section being essentially structurally identical to the ring-segment-shaped sections of the electric machine; and

if one of the ring-segment-shaped sections of the electric machine exhibits a fault:

removing the faulty ring-segment-shaped section from the electric machine; and

installing the at least one additionally provided ring-segment-shaped section within the electric machine.