Robert Boschgmbh

Dietrich Eckstein

Hans Bertsch

Jens Benecke

Bettina Straub

An electric machine (), in particular for the adjustment of movable parts in the motor vehicle, includes a stator housing () which receives a stator () and a rotor (), the rotor () having a rotor shaft (), on which a commutator () is arranged and which can be energized by electric brushes (), and the stator housing () having an axial opening (), through which the rotor shaft () protrudes out of the stator housing (), an electrically conducting shielding plate () being inserted axially between a brush holder plate () and a bearing plate () for the rotor shaft () in order to form a sandwich component (), the sandwich component () extending transversely with respect to the rotor shaft () and covering substantially the entire opening ().

Electric machine with an electrically conducting shielding plate

Proposed is a commutation device for a direct-current motor, designed to improve the ripples in the signal course (,) for the commutation current, so as to obtain reliably and error-free speed information with the aid of an electronic circuit. With the commutation device design according to the invention, the longitudinal edges of the collector bars (,) form an angle (&agr;) of more than zero degrees with the front longitudinal edge (,) of the contact face (,). On the one hand, this results in a reduction of the brush noise (airborne sound) and, on the other hand, in a lowering of the noise development (structure-born sound).

Growing community of inventors

Kappelrodeck, Germany

Dietrich Eckstein