The moving parts of an electric motor are intended to be cooled more effectively and in a simple manner. For this purpose, the invention proposes an electric motor with a first motor part (1) and a second motor part, which interacts magnetically with the first motor part (1) and with respect to which the first motor part is capable of moving in two opposite movement directions (A, B). The electric motor is also equipped with a cooling system, which is fitted to the first motor part (1) and which has a cooling medium for cooling at least the first motor part. The cooling medium is moved, exclusively by means of acceleration of the first motor part (1), in one of the two opposite movement directions (A, B) in the cooling system. The movement can be triggered, for example, by the dead weight in an open cooling cycle system or else by means of a piston (23) in a closed cooling cycle system. The movement of the motor is therefore also used for pumping the coolant and additional electrical components such as fans can be dispensed with.