A wind turbine which includes a direct drive generator is disclosed. The direct drive generator includes an inner stator arrangement and an outer rotor arrangement and a stationary shaft with a center axis. The stator arrangement is arranged on the outside of the stationary shaft, the rotor arrangement is substantially arranged around the stator arrangement, on the front side at least indirectly supported or arranged on the stationary shaft by a main bearing and on the rear side at least indirectly supported or arranged on the stationary shaft by a support bearing. The main bearing and/or the support bearing is a four-point bearing.
1. A wind turbine comprising:
a main bearing;
a support bearing;
a stationary shaft with a centre axis; and
a direct drive generator comprising:
an inner stator arrangement arranged on an outside of the stationary shaft, and
an outer rotor arrangement substantially arranged around the inner stator arrangement, the outer rotor arrangement at least indirectly supported or arranged on a front side of the stationary shaft by the main bearing and at least indirectly supported or arranged on a rear side the stationary shaft by the support bearing wherein the rotor arrangement includes a front endplate which is at least indirectly supported or arranged on the stationary shaft by the main bearing and the front endplate is at least partially flexible in the direction of the centre axis of the stationary shaft and,
wherein at least the main bearing or the support bearing is a four-point bearing.
2. The wind turbine according to claim 1 , wherein the front endplate is a ring-shaped endplate.
3. The wind turbine according to claim 1 wherein the front endplate is made of steel or fibreglass.
4. The wind turbine according to claim 1 wherein the front endplate has a thickness of approximately 15-50 mm.
5. The wind turbine according to claim 1 , wherein the rotor arrangement comprises a rear endplate which is at least indirectly supported or arranged on the stationary shaft by the support bearing.
6. The wind turbine according to claim 5 , wherein the rear endplate is a ring-shaped endplate.
7. The wind turbine according to claim 5 , wherein the rear endplate is made of steel or fibreglass.
8. The wind turbine according to claim 1 , wherein the rotor arrangement comprises a hollow cylinder element.
9. The wind turbine according to claim 1 ,
wherein the rotor arrangement comprises a rear endplate which is at least indirectly supported or arranged on the stationary shaft by the support bearing, and
wherein the rotor arrangement comprises a hollow cylinder element which connects the front endplate to the rear endplate.
10. The wind turbine according to claim 1 , wherein the rotor arrangement comprises a permanent magnet.
11. The wind turbine according to claim 1 , wherein the stator arrangement comprises a stator support structure and a lamination stack with at a winding arranged on the stator support structure.
12. The wind turbine according to claim 1 , wherein the stationary shaft is at least indirectly arranged on a bedplate of the wind turbine.
13. The wind turbine according to claim 12 , wherein the stationary shaft is attached to a retaining arrangement which is arranged on the bedplate.