| 摘要 |
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 (H 1 ) is conveyable and to whose emitter a second rotor position signal (H 2 ) is conveyable, and whose collector signal serves to control the predetermined bridge transistor ( 66 ). A circuit comprising a half bridge is also described.
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