Brushless, electronic commuted motor

A brushless, electronically-commuted motor, particularly as a drive motor for a motor-vehicle fan drive, having a permanent-magnetic outer rotor, in which a stator is disposed, the stator having three winding strands that are offset by 120° electrically from one another, with one half of a coil being wound per rotor pole and per strand, and with each winding strand comprising a plurality of winding coils, whose coil width is smaller than the rotor pole pitch, and which are inserted into winding grooves of the stator, and wherein:

• each winding strand comprises a plurality of parallel-connected winding coils;
• the outer rotor has at least p=3 pole pairs;
• a circuit board having current bars is provided for connecting the individual winding coils;
• the stator comprises a hollow-cylindrical magnetic-yoke having stator poles, which are disposed in the longitudinal direction on the outer circumferential surface of the yoke, and are fixedly connected to the yoke by a compression connection;
• the stator poles and the magnetic-yoke comprise stamped sheet-steel parts;
• the ends of the stator poles facing away from the rotor are provided with plug-in shoes, which are pressed into guide grooves in the surface of the magnetic-yoke;
• the plug-in shoes of the stator poles and the guide grooves have a dovetail-like shape;
• the joining line between the plug-in shoes and the guide grooves partially has an air gap, so that the plug-in shoes form a press fit only in partial regions in the guide grooves;
• and, the joining line between the stator poles and the magnetic-yoke is asymmetrical with respect to the stator-pole axis.