IN-WHEEL MOTOR AND VEHICLE

1 . An in-wheel motor comprising a rotor coaxially surrounding a stator, the stator comprising electromagnets, the electromagnets in working producing heat, the heat at least in part removed from the stator by gas, wherein the motor comprises an electric fan internal to the rotor for displacing the gas.

2 . The in-wheel motor of claim 1 in which the motor comprises a temperature sensor and a controller attached thereto, the controller controlling the fan in such a way that the amount of gas that is displaced by the fan depends on the temperature of the stator.

3 . The in-wheel motor of claim 1 in which the fan is disabled if the temperature of the stator is below a predetermined temperature and enabled if the temperature is above the predetermined temperature.

4 . The in-wheel motor of claim 1 in which the gas has a heat capacity higher than that of dry air at one atmosphere.

5 . The in-wheel motor of claim 4 in which the gas is pressurized air.

6 . The in-wheel motor of claim 5 , comprising an air valve arranged to provide the pressurized air from outside the in-wheel motor to an inner space enclosed by the rotor.

7 . The in-wheel motor of claim 4 , comprising a conduit arranged to transfer water from outside the in-wheel motor to an inner space enclosed by the rotor.

8 . The in-wheel motor of claim 7 , comprising a nozzle arranged at an end of the conduit in the inner space enclosed by the rotor, wherein the nozzle is adapted to vaporize water entering the inner space.

9 . The in-wheel motor of claim 1 in which the electric fan is mounted in a through-hole in the stator.

10 . The in-wheel motor of claim 1 , wherein the stator has a through-hole extending in an axial direction of the in-wheel motor, wherein the electric fan is arranged to displace the gas through the through-hole.

11 . The in-wheel motor of claim 9 , comprising a guiding element, wherein the rotor comprises a rotor surface, wherein the guiding element is arranged on the rotor surface, wherein the electric fan is arranged radially inward of the electromagnets, wherein the electric fan is arranged to displace the gas towards the rotor surface, wherein the guiding element is adapted to divide the gas into a radially inward flow and a radially outward flow.

12 . The in-wheel motor of claim 1 , comprising at least one fin, wherein the rotor comprises a rotor surface, wherein the at least one fin is arranged on the rotor surface, wherein the electric fan is arranged to displace the gas along the at least one fin.

13 . The in-wheel motor of claim 12 , wherein the at least one fin is spiral shaped.

14 . A vehicle equipped with one or more in-wheel motors according to claim 1 .

15 . The vehicle according to claim 14 , wherein the in-wheel motor comprises a conduit, wherein the vehicle comprises a HVAC-unit, wherein the HVAC-unit is adapted to extract water from air, and wherein the HVAC-unit is adapted to provide the extracted water via the conduit to the in-wheel motor.