The invention relates to an electromotor comprising an external stator, and a ventilation vessel which is used to produce a cool air flow in order to properly cool the electromotor. In order to cool the electromotor in an improved manner, an air flow is guided, by means of a ventilator vessel, along the outer surface of the motor housing, through the inside of the housing of the electromotor and through an air gap formed between an intermediate housing wall and a ventilation vessel.