| 摘要 |
<p>The invention relates to an actuator (ACT) consisting of: a direct-current motor (MOT) which comprises an armature that is powered via brushes (B) and a commutator (L) and which drives a roller shutter (LD) by means of a mechanical transmission device (TRD); and a device (DD) for detecting and counting the switching operations that take place between the brushes (B) and the plates (L) of the commutator. The mechanical transmission device (TRD) comprises a transmission element (BRK) such that, during the mobile element (LD) manoeuvring phases, the motor (MOT) supply current is always a non-zero current and always flows in the direction defined by the motor operation of the motor (MOT).</p> |
