In-wheel motor with cooling system

A vehicle wheel assembly comprising:

• a wheel for mounting a tire thereon and having an inner space;
• and
• an in-wheel motor mounted in the inner space of the wheel and configured to drivingly rotate the wheel, the in-wheel motor comprising:
• a rotor coupled to the wheel;
• a stator comprising a wall, wherein the rotor is configured to be rotatable relative to the stator, and the stator is configured to drive the rotor;
• an electronic device comprising a circuit board and electronics mounted on the circuit board, the electronic device configured to control the in-wheel motor;
• two-phase dielectric material;
• and
• one or more covers coupled with the stator to form a hermetic enclosure, wherein the electronic device and the two-phase dielectric material are contained in the hermetic enclosure formed by the wall of the stator and the one or more covers coupled with stator, and the two-phase dielectric material is in contact with the wall of the stator and the electronic device so that the two-phase dielectric material changes temperature of the stator and the electronic device by transitioning between a liquid phase and a gaseous phase.