Patent ID: 7778529

Claim:
Method for supplying electrical power to a DC motor which can be commutated electronically via a semiconductor power output stage, through which a control unit passes current in blocks, corresponding to the signals from a rotor position sensor, the method comprising: passing the current through the motor ( 16 ) variably in steps, in such a manner that the magnitude and/or the duration and/or the trigger angle of the current blocks (I; FIG. 2 ) can be varied as a function of the rotational speed and/or of the load, with respect to the profile of the induced voltage (E); energizing a three-phase motor ( 16 ) in a lower rotational speed range (I) with a block length of 150° el and a trigger angle of 0 to 30° el with respect to the zero passage of the induced voltage (E); energizing the three-phase motor ( 16 ) in a middle rotational speed range (II) with a block length of 180° el and a trigger angle of −30° el to 0° el with respect to the zero passage of the induced voltage (E); and energizing the three-phase motor ( 16 ) in a upper rotational speed range (III) with a block length of 180° el and a trigger angle of −30 to −60° el with respect to the zero passage of the induced voltage (E).