| 摘要 |
<p>The invention concerns a gear motor activating a motor vehicle functional member, comprising a direct current electric motor (2) at the end of which is arranged a reduction gearbox case (3), wherein are provided means (4) sensing the engine speed and the rotating direction, including a coded magnetic wheel (5) associated with the engine output shaft (6) and at least two mutually offset cells with Hall effect (7), whereof the output is adapted to be connected with means processing/conditioning signals. The invention is characterised in that the cells with Hall effect (7) are located opposite at least part of the coded wheel (5) side surface between the latter and means (8) concentrating the magnetic flux.</p> |
