Abstract: A device is proposed for suppressing radio interference in an electrical commutator machine, in particular a DC motor (10), having a rotor (12) supplied via brushes (14a, b) and having an interference suppression circuit (16) that has at least one capacitor and further components. The device of the invention is distinguished in that the interference suppression circuit (16) on the one hand has an interference suppression ring comprising individual interference suppression elements (56), which contain at least one varistor (28and/or at least one capacitor (30) and cooperate with at least one further outer interference suppression capacitor. The individual interference suppression elements (56) of the interference suppression ring (24) are either located between adjacent laminations (32) of the commutator (34) or are connected by one terminal to one lamination (34) and by the respective second terminal to one another to form a virtual zero point 33).

Abstract: A radiator blower, in particular for motor vehicles, is indicated that comprises a plurality of individual fans (11, 12), each having an electrical drive motor (13, 14), and a plurality of switches (S1, S2, S3), each capable of being switched over into two positions, by means of which the drive motors (13, 14) are capable of being turned on and back off individually or in a series or parallel connection. To prevent disturbing noises from developing when the individual fan (11, 12) comes to rest after being turned off, when the operating drive motor or motors (13, 14) is/are turned off, an electronic control unit (20) forces the switches (S1, S2, S3)—at least temporarily—over into switch positions that bring about a short-circuiting of the turned-off drive motor or motors (FIG. 1).