Kommutierungsvorrichtung für Gleichstrommotor

摘要

The invention concerns a direct current motor commutation device which is used to improve the ripple of the commutating current signal form (40, 50) in order to obtain data concerning the speed of rotation in a reliable and error-free manner by means of an electronic circuit. With the commutation device according to the invention, the longitudinal edges of the commutator segments (11, 21, 31) form an angle ( alpha ) of greater than 0 DEG with the front longitudinal edges (18, 28, 38) of the contact surface (16, 26, 36). In this way, the brush noise (airborne noise) and noise development (impact sound) are reduced.