Dynamo-electric machine with reduced cogging torque

A dynamo-electric machine comprising:

• a circuit board configured to support a yoke, teeth connected to the yoke, and grooves located between the teeth and the yoke;
• a secondary part that is spaced apart from the circuit board via an air gap, wherein the secondary part includes a plurality of permanent magnets that lie adjacent to one another with alternating polarity;
• and
• a multi-phase tooth coil winding that is arranged in the grooves, wherein adjacent tooth coils are connected to form groups having an identical electrical phase and adjacent teeth of the groups of tooth coils having an identical electrical phase are connected in a magnetically conductive manner via the yoke, wherein the yoke is interrupted between adjacent tooth coils having a different electrical phase.

A dynamo-electric machine comprising:

• a sheet metal having a plurality of teeth, a yoke, and grooves located between the teeth and the yoke;
• a plurality of permanent magnets that lie adjacent to one another with alternating polarity on an iron plate, wherein the plurality of permanent magnets are spaced apart from the sheet metal via an air gap;
• and
• a multi-phase tooth coil winding that is arranged in the grooves, wherein adjacent tooth coils are connected to form groups having an identical electrical phase, wherein adjacent teeth of the groups of tooth coils having an identical electrical phase are connected in a magnetically conductive manner via the yoke.