Use of oriented grain rolling in a wind turbine generator

1. A wind turbine for generating electric power, comprising a generator ( 105 ) and a wind turbine rotor ( 101 ) for driving the generator ( 105 ), wherein the generator ( 105 ) comprises:

a generator stator ( 201 ) comprising at least two stator poles ( 203 ), wherein each stator pole ( 203 ) is provided with windings ( 204 ) of wire, wherein at least part of the generator stator ( 201 ) contains metal having directional magnetic properties, and wherein an outer diameter of the generator stator ( 201 ) is between 1 and 4 meters;

a generator rotor ( 210 ) comprising at least two magnetic components ( 211 ); and

a stator ring ( 220 ) comprising a plurality of stator-ring sections ( 221 );

wherein said generator ( 105 ) is connected to the wind turbine rotor ( 101 ) via a gearbox ( 103 ), wherein the gearbox ( 103 ) during operation of the wind turbine increases the rotational speed of the generator ( 105 ) in comparison with the rotational speed of the wind turbine rotor ( 101 ), between 2 and 15 times; and

the generator ( 105 ) is a medium speed generator having a rotational speed during operation within 30-1000 RPM.

2. A wind turbine according to claim 1 , where the rotational speed of the generator ( 105 ) during operation of the wind turbine increases between two and ten times the rotational speed of the wind turbine rotor ( 101 ), and at least five times the rotational speed of the wind turbine rotor ( 101 ).

3. A wind turbine according to claim 1 , wherein the at least two magnetic components ( 211 ) are permanent magnets, which magnets are already fully magnetized during periods of time when the wind turbine is not supplied with electric power.

4. A wind turbine according to claim 1 , wherein the at least two magnetic components ( 211 ) are magnets being magnetized during periods of time when the wind turbine is supplied with electric power, and which are being gradually de-magnetized during periods of time when the wind turbine is not supplied with electric power.

5. A wind turbine according to claim 1 , wherein the at least two magnetic components ( 211 ) are electro-magnets being magnetized during periods of time when the wind turbine is supplied with electric power.

6. A wind turbine according to claim 1 , wherein the gearbox ( 103 ) is a two-stage gearbox.

7. A wind turbine according to claim 1 , wherein the generator ( 105 ) is a synchronous generator.

8. A wind turbine according to claim 1 , wherein the wind turbine further comprises at least two frequency converters ( 106 ) and wherein each of the at least two stator-poles ( 203 ) are connected one-to-one to corresponding at least two frequency converters.

9. A wind turbine according to claim 1 , wherein the wind turbine further comprises at least one frequency converter ( 106 ) and wherein each of the at least two stator-poles ( 203 ) is connected to a single frequency converter ( 106 ) common to the at least two stator-poles ( 203 ).

10. A wind turbine according to claim 1 , wherein at least part of the generator rotor ( 210 ) contains metal having directional magnetic properties.

11. A wind turbine according to claim 1 , wherein the generator ( 105 ) is a type comprising already fully magnetized magnets ( 211 ), which magnets are structurally integrated with a synchronous or asynchronous induction generator ( 105 ), and which magnets are magnetically independent from stator windings ( 204 ) of the synchronous or asynchronous induction generator.

12. A wind turbine according to claim 1 , wherein the generator ( 105 ) is a type comprising magnets ( 211 ) being magnetized by the generator, which magnets are structurally integrated with a synchronous or asynchronous induction generator ( 105 ), and which magnets are magnetically dependent of any stator windings ( 204 ) of the synchronous or asynchronous induction generator.

13. A wind turbine according to claim 1 , wherein the outer diameter of the generator stator ( 201 ) is between 3 and 4 meters.

14. A wind turbine according to claim 1 , wherein the generator ( 105 ) is a medium speed generator having a rotational speed during operation within 45-750 RPM.

15. A wind turbine according to claim 1 , wherein the generator is a medium speed generator having a rotational speed during operation within 60-500 RPM.

16. A wind turbine according to claim 1 , wherein the outer diameter of the generator stator ( 201 ) is between 2 and 3 meters.

17. A wind turbine according to claim 1 , wherein the outer diameter of the generator stator ( 201 ) is between 1 and 2 meters.