A motor, suitable for driving a fan, features a plain bearing (36) that contains ferromagnetic material and serves for radial support of a rotor shaft (34) made of ferromagnetic material. The shaft (34) is arranged rotatably and axially displaceably in that plain bearing (36), and has a free end (35). Provided at the free end is a thrust bearing which has a dome-shaped end (66) provided at that free end (35), and a contact member (68, 69), coacting with the latter dome, the contact member being made at least partially of ferromagnetic material. Also provided is at least one permanent magnet (72) in order to form a magnetic circuit (82) from a first magnet pole (74) via the plain bearing (36), the free shaft end (35) and its dome-shaped end (66), and the contact member (68) to the other magnet pole (76), and thereby to bring about a defined magnetic attractive force between the dome-shaped end (66) and the contact member (68). The magnetic force minimizes rattling of the shaft (34), even in vibration-prone environments.