Patent ID: 8823222

Claim:
A motor assembly comprising an electric motor and a cooling system, the motor comprising a stator and a rotor rotatably mounted to the stator, wherein the cooling system comprises a cooling pipe thermally coupled to an element of the stator and providing a flow path for a liquid, the cooling pipe comprising a plurality of straight pipe sections and a plurality of bent pipe sections interconnecting the straight pipe sections; and wherein the stator comprises a stator core comprising a plurality of laminations laminated along the straight pipe sections, wherein the motor assembly further comprises: a tank for storing the liquid connected to the cooling pipe; a pump arranged to move the liquid through the cooling pipe; at least one spray nozzle arranged to spray the liquid onto a roller brush of a cleaner after the liquid has passed through the cooling pipe; and an electric heating member arranged to heat the liquid from the cooling pipe to a predetermined temperature before being sprayed from the at least one spray nozzle.