Base Frame of Wind Turbine

A base frame for a wind mill of a direct driven wind turbine includes a first interface to connect a rotor arrangement of the wind turbine with the first interface. A second interface is arranged to connect a tower with the second interface. An intermediate part connects the first and the second interface. The second interface has a collar structure. A third interface is arranged to attach a support structure to the base frame. The third interface exclusively has a first connection-area and a second connection-area. The first connection area connects the third interface with the collar structure. The second connection-area connects the third interface via a rib with the intermediate part of the base frame.