Adjusting system of a vehicle with means for determining speed from the ripple of a driving current

摘要

The system has a control device (100) including measuring resistor (120) and microcontroller (140) for measuring a ripple of a drive current flowing through a mechanically commutated drive motor (20), where the ripple is caused by mechanical commutation. The control device is designed to control the drive motor depending on the measured ripple. A number of windings of a coil of the drive motor include a winding pitch corresponding to half the number of slots of the drive motor reduced by two.