Generator, wind turbine and method for cooling a direct drive generator of a wind turbine

A generator for a wind turbine comprising:

• a rotor and a stator separated radially by an air gap, wherein the stator comprises at least one stator segment having a stack of lamination sheets and at least one stator winding, and a stator support structure supporting the at least one stator segment,
• wherein the generator further comprises a cooling arrangement for providing cooling fluid at least to the air gap, wherein the cooling arrangement includes a cooling fluid flow dividing element for dividing an incoming cooling fluid flow to the stator into a first partial cooling fluid flow directed to a coil overhang and the air gap for cooling an air gap side of the at least one stator segment and a second partial cooling fluid flow directed to the stator support structure for cooling a non-air gap side of the at least one stator segment,
• wherein the at least one stator segment includes at least one radially extending cooling duct having an opening to the air gap, wherein the first partial cooling fluid flow at least partly enters the at least one cooling duct,
• wherein both partial cooling fluid flows are completely separated over their whole cooling path, and
• wherein the cooling fluid flow dividing element comprises at least one actuator controllable by at least one control device for adjusting a distribution of the incoming cooling fluid flow to the partial cooling fluid flows.