METHOD AND DEVICE FOR DETECTING THE ROTATION OF A BRUSH-OPERATED D.C. MOTOR

摘要

The invention relates to a method and a device for detecting the rotation of a brush-operated d.c. motor (1) comprising a number of winding branches (3) which are electrically connected between brushes (6, 7), during the operation of the motor, by means of plates (4), according to the rotational angle. According to the invention, an alternating voltage signal is modulated on the basis of a supply direct voltage for the brushes (6, 7), by which means the course of the complex resistance of the direct current motor (1) is determined and used for the detection of rotation. In this way, the invention enables a cost-effective rotation detection that can be used in motor vehicle technology without requiring additional mechanical components.