Gleichstrommotor

Abstract

A DC motor (2) comprising a yoke housing (5), a permanent magnet (7) fixed to the inner peripheral surface of the yoke housing (5) and having six magnetic poles, and an armature (6) mounted on the inside of the permanent magnet (7) in a freely rotatable manner, wherein the armature (6) comprises a shaft (3) supported by the yoke housing (5), an armature core (8) which is placed and fixed on the shaft (3) from the outside, and a commutator (10) which is provided on the shaft adjacent to the armature core (8) with nine segments (15, 15a-d, 15f) arranged in the circumferential direction; the armature core (8) has nine teeth (12) extending radially in a radial pattern and nine slots (13, 13a-j) formed between the teeth (12) and extending axially; the segments (15, 15a-d, 15f) are connected with the same polarity by means of a short-circuit element (17); three armature coils (9) arranged on the teeth (12) each have a set of coils, each set comprising a first, second and third coil which are connected in series and which are arranged at a distance of 120° from one another in the circumferential direction; a transfer wire (14a) arranged to connect a set of coils arranged at a distance of 120 degrees, connected in series between the set of coils and connected to the shaft (3), and a pair of brushes (21) which make sliding contact with the segments (15, 15a-d, 15f) are arranged so that they are centered on the shaft (3) in a point-symmetrical manner.

Images