| 摘要 |
A drive unit, in particular for a fan in motor vehicles, is indicated, comprising an electric motor (12) operated on a DC line (UBat), and comprising a device (13) for controlling the speed of the motor (12) by changing the operating voltage applied at the motor (12). In order to cost-effectively realize a stepwise adjustment of the motor speed, the speed control device (13) comprises a plurality of resistors (R1-R3) and a plurality of semiconductor switches (T1-T3) for selectively connecting the motor (12) in series with at least one of the resistors (R1-R3) (FIG. 1).
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