Stator for dynamoelectric machine

A rotary dynamoelectric machine comprising:

• a generally cylindrical stator having a stator surface surrounded by a generally cylindrical external rotor rotatable about a rotational axis and having a generally cylindrical rotor surface facing said stator surface and being spaced apart therefrom by a generally cylindrical gap;
• a plurality of magnetic poles on said rotor surface facing said stator surface and positioned adjacent said generally cylindrical gap;
• wherein said stator has a generally cylindrical substrate of a first material having an outer surface and a thin annular cylindrical layer on said outer surface of said substrate, said annular cylindrical layer having an outer annular surface, a plurality of wound poles superimposed on said outer annular surface, so that the wound poles are adjacent said cylindrical gap and face said rotor, and at least a majority of the wound poles are positioned substantially parallel to the rotational axis of the rotor;
• and
• wherein said thin annular cylindrical layer is formed from one or more layers of an elongate material, said elongate material comprising a soft magnetic material having a magnetic permeability greater than 20.