Method to rotate the rotor of a wind turbine and means to use in this method

A direct driven wind turbine, comprising:

• an electrical generator having a rotor and a stator, a hub constructed to receive a rotor blade, and an actuator device,
• wherein the hub is connected to the rotor of the electrical generator,
• wherein the hub and the rotor of the electrical generator are rotatably mounted with respect to the stator of the generator,
• wherein the actuator device includes a motor, and is constructed and arranged to rotate the rotor and the hub in respect to the stator of the electrical generator, and
• wherein the electrical generator further comprises a brake-disc attached to the rotor for braking the rotation of the rotor, wherein the motor is operable to act on the brake-disc, wherein the brake-disc includes a toothed rim, and the motor includes a geared wheel operably configured to interact with the toothed rim, such that the rotation of the motor is transferred from the motor to the toothed rim.