Arrangement of coil wires in a rotor of an electric motor

An armature for an electric motor, the armature comprising:

• a rotor with a plurality of teeth,
• at least one insulator that covers at least a part of the plurality of teeth,
• a plurality of coils wound on the plurality of teeth covered by the at least one insulator, and
• a plurality of cavities, wherein each one of the cavities is arranged between two of the plurality of teeth and is formed on the at least one insulator, and wherein at least one of the plurality of cavities is configured and arranged for receiving coil windings adjacent to a wall portion of the at least one cavity, wherein the at least one of the plurality of cavities comprises a switching wire receptor;
• wherein the switching wire receptor comprises a recess in a wall portion of the at least one of the plurality of cavities for receiving a switching wire;
• and
• wherein the recess has a depth substantially corresponding to the diameter of the switching wire.