Windmill driven energy converting device comprising a number of wind blades attached to a shaft that is connected to: a rotor with permanent magnets, which rotor is arranged inside or outside a stator having an electrically conducting wall that is configured to be subjected to magnetic induction generated by the rotation of the permanent magnets and thus configured to generate heat through generation of eddy currents and a heat exchanger comprising a heat-carrying media (e.g. a fluid) configured to take up thermal energy from the conducting wall, and optionally a generator characterised in that the energy converting device comprises means for changing the axial position of the electrically conducting wall relative to the rotor and that the energy converting device comprises means for regulating the pitch of the blades, where the regulation of the pitch of each blade is accomplished by: - using at least one spring member arranged in a chamber provided in the hub to provide a force towards a force transferring member configured to transfer force from the spring member to an eccentric member that is mechanically connected to the blade shaft of the blade and configured to press the force transferring member towards the at least one spring member and that the eccentric member is configured to rotate about longitudinal axis of the blade shaft so that the wind induced forces that acts on the blade causes the blade to pitch in a manner that causes the eccentric member to push against and move the force transferring member towards the at least one spring member; - using electrical means configured to provide a force that causes that the blade is pitched or - using a hydraulic means configured to provide a force that causes that the blade is pitched - where the means for regulating the pitch of the blades consists of an eccentric member having a basically arced and conical geometry that secures a smooth movement of the force transferring member when the blades are pitched and the eccentric member accordingly is turned and moves the force transferring member. a rotor with permanent magnets, which rotor is arranged inside or outside a stator having an electrically conducting wall that is configured to be subjected to magnetic induction generated by the rotation of the permanent magnets and thus configured to generate heat through generation of eddy currents and a heat exchanger comprising a heat-carrying media (e.g. a fluid) configured to take up thermal energy from the conducting wall, and optionally a generator - using at least one spring member arranged in a chamber provided in the hub to provide a force towards a force transferring member configured to transfer force from the spring member to an eccentric member that is mechanically connected to the blade shaft of the blade and configured to press the force transferring member towards the at least one spring member and that the eccentric member is configured to rotate about longitudinal axis of the blade shaft so that the wind induced forces that acts on the blade causes the blade to pitch in a manner that causes the eccentric member to push against and move the force transferring member towards the at least one spring member; - using electrical means configured to provide a force that causes that the blade is pitched or - using a hydraulic means configured to provide a force that causes that the blade is pitched - where the means for regulating the pitch of the blades consists of an eccentric member having a basically arced and conical geometry that secures a smooth movement of the force transferring member when the blades are pitched and the eccentric member accordingly is turned and moves the force transferring member.