Direct current motor commutation device

Proposed is a commutation device for a direct-current motor, designed to improve the ripples in the signal course (40, 50) 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 (11, 21, 31) form an angle (alpha) of more than zero degrees with the front longitudinal edge (18, 28, 38) of the contact face (16, 26, 36). 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).