An electronically commutated
DC motor comprises a
stator comprising at least one
stator winding (22, 24, 26), a rotor (28) electromagnetically interacting with the
stator, a positive and a negative
DC voltage line (76, 78) for supplying power to the motor (20), in particular from a battery (77), a
full bridge circuit (74) for controlling the current in the at least one stator winding (22, 24, 26), which
full bridge circuit (74) comprises a plurality of bridge arms that each comprise an upper bridge
transistor (66, 80, 86) for controlling the current from the positive
DC voltage line (76) to an associated terminal (68; 82; 88) of that stator winding (22, 24, 26) as well as a lower bridge
transistor (70, 84, 90) for controlling the current from the relevant terminal of the stator winding to the negative
DC voltage line (78). The motor further comprises an arrangement for generating a plurality of rotor position signals, and an arrangement for controlling a predetermined bridge
transistor by
logical combination of rotor position signals associated therewith, there being provided, for
logical combination of those rotor position signals, a control transistor (60) to whose base a first rotor position
signal (H1) is conveyable and to whose emitter a second rotor position
signal (H2) is conveyable, and whose collector
signal serves to control the predetermined bridge transistor (66). A circuit comprising a
half bridge is also described.