Electronically commutated dc motor comprising a bridge circuit

Abstract

An electronically commutated DC motor comprises a stator comprising at least one stator winding (), a rotor () electromagnetically interacting with the stator, a positive and a negative DC voltage line () for supplying power to the motor (), in particular from a battery (), a full bridge circuit () for controlling the current in the at least one stator winding (), which full bridge circuit () comprises a plurality of bridge arms that each comprise an upper bridge transistor () for controlling the current from the positive DC voltage line () to an associated terminal () of that stator winding () as well as a lower bridge transistor () for controlling the current from the relevant terminal of the stator winding to the negative DC voltage line (). 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 () to whose base a first rotor position signal (H) is conveyable and to whose emitter a second rotor position signal (H) is conveyable, and whose collector signal serves to control the predetermined bridge transistor (). A circuit comprising a half bridge is also described.