Base frame for a nacelle of a direct driven wind turbine, comprising - a first interface that is prepared and arranged for a connection of a rotor arrangement of the wind turbine with the first interface, - a second interface that is prepared and arranged for a connection of a tower of the wind turbine with the second interface, - an intermediate part, which connects the first and the second interface, wherein the intermediate part is prepared and arranged for the transfer of loads or vibrations between the rotor arrangement and the tower, - wherein the rotational axis of the rotor arrangement and the longitudinal axis of the tower define a first plane, which is oriented mainly vertical, - wherein the second interface comprises a collar structure, which is prepared and arranged for a connection with at least one yaw-drive being used to turn the nacelle of the wind turbine, - a third interface that is prepared and arranged to attach a support structure to the base frame, while the support structure is capable to carry additional electrical and mechanical equipment of the wind turbine, - wherein the third interface comprises a flange plate that is prepared and arranged to attach a support structure to the third interface, - wherein the third interface exclusively comprises a first connection-area and a second connection-area, - wherein the first connection area is prepared to connect the third interface with the collar structure, - wherein the second connection-area is prepared to connect the third interface via a rib with the intermediate part of the base frame, - wherein the rib extends along a plane which is mainly parallel to the first plane characterized in that - the rib leads along the collar structure and the intermediate part of the base frame, - wherein the rib is attached to the surface of the intermediate part of the base frame while it is leading upward along the surface of the intermediate part, - wherein the rib is attached to the surface of the intermediate part in a way that the rib transfers drag forces from the third interface to the intermediate part, - wherein the first connection-area is prepared to transfer mainly vertical forces from the third interface to the tower, - thus the transfer of loads or vibrations from the intermediate part towards the third interface is minimized. - a first interface that is prepared and arranged for a connection of a rotor arrangement of the wind turbine with the first interface, - a second interface that is prepared and arranged for a connection of a tower of the wind turbine with the second interface, - an intermediate part, which connects the first and the second interface, wherein the intermediate part is prepared and arranged for the transfer of loads or vibrations between the rotor arrangement and the tower, - wherein the rotational axis of the rotor arrangement and the longitudinal axis of the tower define a first plane, which is oriented mainly vertical, - wherein the second interface comprises a collar structure, which is prepared and arranged for a connection with at least one yaw-drive being used to turn the nacelle of the wind turbine, - a third interface that is prepared and arranged to attach a support structure to the base frame, while the support structure is capable to carry additional electrical and mechanical equipment of the wind turbine, - wherein the third interface comprises a flange plate that is prepared and arranged to attach a support structure to the third interface, - wherein the third interface exclusively comprises a first connection-area and a second connection-area, - wherein the first connection area is prepared to connect the third interface with the collar structure, - wherein the second connection-area is prepared to connect the third interface via a rib with the intermediate part of the base frame, - wherein the rib extends along a plane which is mainly parallel to the first plane - the rib leads along the collar structure and the intermediate part of the base frame, - wherein the rib is attached to the surface of the intermediate part of the base frame while it is leading upward along the surface of the intermediate part, - wherein the rib is attached to the surface of the intermediate part in a way that the rib transfers drag forces from the third interface to the intermediate part, - wherein the first connection-area is prepared to transfer mainly vertical forces from the third interface to the tower, - thus the transfer of loads or vibrations from the intermediate part towards the third interface is minimized.