Electric motor with reduced axial length

An electro-mechanical device having an axis of rotation, said machine comprising:

• a rotor having a plurality of permanent magnetic poles, an outer face, a given axial length, and first and second axially opposite rims;
• a stator concentrically surrounding said rotor and including:
• a soft magnetic yoke having an inner surface parallel to and spaced apart from the outer face of the rotor;
• and
• at least one continuous multi-pole winding applied to said inner surface, said winding comprising a plurality of segments running in alternating directions;
• and
• wherein said outer face and inner surface are not parallel to said axis of rotation;
• and,
• wherein said winding comprises:
• at least one insulated conductor wound into a helicoidal multi-turn loop of a given width, said loop being folded at two diametrically opposite locations about a pair of parallel axes to form two substantially symmetrical arches;
• whereby said winding defines a substantially frustro-conical structure;
• said device being shaped and dimensioned to intimately contact the inner surface of the yoke.

An electro-mechanical device having an axis of rotation, said machine comprising:

• a rotor having a plurality of permanent magnetic poles and an outer surface;
• a stator concentrically surrounding said rotor and having an inner surface parallel to and spaced apart from the outer face of the rotor;
• and
• at least one winding applied to said inner surface facing said outer surface of said rotor;
• wherein said outer face and inner surface are not parallel to said axis of rotation;
• wherein said stator and said rotor have substantially identical axial lengths.