Cooling device of large-capacity MW stage medium-voltage direct drive wind power generator

The utility model provides a cooling device of a large-capacity MW stage medium-voltage direct drive wind power generator. The cooling device is characterized by comprising a stator and a rotor of the power generator, wherein a sleeve is additionally arranged between the stator and the rotor of the power generator, the end portions of two sides of the sleeve are sealed through sealing end covers, and therefore a sealed cavity is formed in a stator inner cavity. Cooling liquid is arranged in the sealed cavity, the stator is provided with a cooler, and the cooler is communicated with the stator inner cavity. Compared with a traditional direct drive motor, the cooling device is good in cooling effect, operation stability is improved, and capacity of the MW stage fan is large. Compared with a fan of the same type, the fan has the advantages of being small in size, low in weight and low in cost.