Gleichstrommotor und Verfahren zur Herstellung desselben

A brushless DC motor includes a stator having a plurality of types of teeth 3,4 having different circumferential widths. The coils 13,14,15 of each phase are disposed so that the coil 13,14,15 wound on the wide tooth 3 is adjacent via the coil of another phase to the coil 13,14,15 wound on the narrow teeth 4. The coils 13,14,15 are wound on the teeth 3,4 repeatedly alternately in a sequence of the wide tooth 3 and the narrow tooth 4 or in a reverse sequence. Stator insulation comprises members 7,8 fitted to the stator, the rdially inner portions of which define inter-coil wiring guide channels eg 21 on the upper and lower surfaces (see also figs 11-14), terminal housings 29-34 being provided on the upper section. The insulation has protrusions 9d to locate the first layer of each coil. Auxiliary bindings eg 13b,c may be added. A winding arrangement is disclosed (fig17) and a three tooth system is described. The coil winding section of the teeth may be the same width, only the pole piece carried at the tooth tip being subject to the width requirement.