Patent ID: 7977831

Claim:
An electromotor comprising: a rotor rotatably mounted on a rotor axle and a fixed stator in the inside of a motor housing and a ventilator vessel, wherein the ventilator vessel is fixably connected with the rotor and at least partially encompasses the motor housing in the shape of a pot, in such a way that an air gap with an air gap opening is formed between the outer wall of the motor housing and the wall of the ventilator vessel, wherein the motor housing has ventilation openings both outside and inside the air gap and the ventilator vessel has moldings, which act as air blades and are arranged in such a way that when the rotor is turning, a difference in pressure is formed between the ventilation opening arranged outside the air gap and the air gap opening, which generates an air flow, wherein the stator is an electromagnetically excited external stator, which has electromagnetically active iron material and a winding and which is fixably connected to and in heat conducting connection with the outside wall of the motor housing; wherein in the inside of the motor housing the air flow flows directly past the stator and in the air gap past the exterior of the outside wall of the motor housing and takes up lost heat from the external stator in each case; and wherein the outside wall of the motor housing has moldings inside the air gap, which moldings act as cooling elements.