| 摘要 |
1. A driving device for a movable element, in particular for a window raiser of a motor vehicle, comprising an electric driving motor (1) coupled to the movable element, this motor being of the DC type and having permanent magnets and including an armature (4) whose commutator (5) cooperates with two main branches (7a, 7b) placed on the mutual line (LN) of the armature (4) and a third auxiliary brush (8a, 8b; 8c) which is angularly offset from the mutual line, this motor being electrically connected to a selector (10, 10A; 10B) capable of selectively applying the supply voltage to said brushes (7a, 7b, 8a, 8b, 8c) so as to determine distinct speeds of the motor, characterised in that said motor (1) comprises a fourth brush (8b, 8c)placed on same side as the third brush relative to the mutual line (LN) and said selector (10, 10A; 10B) is adapted to apply selectively either of the polarities of the supply voltage to said third and fourth brushes so as to obtain a reversible operation of the motor at each of said distinct speeds. |
