A stator assembly (11; 111) for an electric motor, which comprises: - a lamination pack which is provided with a perimetric frame with at least one pair of pole shoes (14, 15), each one of which is constituted by a winding body (16, 17) and a widened head (18, 19), - a frame for supporting the lamination pack, - a spool of conducting wire (21, 22) for each pole shoe (14, 15), with the interposition of an insulating support (23, 24), - means for reducing rotational friction, for the driving shaft of a rotor, - accommodation parts (27, 28) for said means for reducing rotational friction; - said perimetric frame and said pole shoes (14, 15) are mutually distinct elements joined with fixing means; - each insulating support (23, 24) being constituted by an annular body (30, 31) with a through axial opening (32, 33) which is contoured to surround a corresponding winding body (16, 17); - said supporting frame for the lamination pack being locked by being trapped between said perimetric frame of said pack and said insulating supports (23, 24), wherein said insulating supports (23, 24) are provided with corresponding containment shoulders (38, 39, 40, 41) for a corresponding spool of conducting wire (21, 22), radially external containment shoulders (38, 40) having extraction-preventing protrusions (42, 43) that extend outward and are intended to encounter one or more abutment shoulders of the said supporting frame which on the opposite side are in abutment with the perimetric frame, said insulating supports (23, 24) being locked so as to surround the respective winding body (16, 17) by virtue of the fixing of the respective winding body (16, 17) to the perimetric frame. - a lamination pack which is provided with a perimetric frame with at least one pair of pole shoes (14, 15), each one of which is constituted by a winding body (16, 17) and a widened head (18, 19), - a frame for supporting the lamination pack, - a spool of conducting wire (21, 22) for each pole shoe (14, 15), with the interposition of an insulating support (23, 24), - means for reducing rotational friction, for the driving shaft of a rotor, - accommodation parts (27, 28) for said means for reducing rotational friction; - said perimetric frame and said pole shoes (14, 15) are mutually distinct elements joined with fixing means; - each insulating support (23, 24) being constituted by an annular body (30, 31) with a through axial opening (32, 33) which is contoured to surround a corresponding winding body (16, 17); - said supporting frame for the lamination pack being locked by being trapped between said perimetric frame of said pack and said insulating supports (23, 24), wherein said insulating supports (23, 24) are provided with corresponding containment shoulders (38, 39, 40, 41) for a corresponding spool of conducting wire (21, 22), radially external containment shoulders (38, 40) having extraction-preventing protrusions (42, 43) that extend outward and are intended to encounter one or more abutment shoulders of the said supporting frame which on the opposite side are in abutment with the perimetric frame, said insulating supports (23, 24) being locked so as to surround the respective winding body (16, 17) by virtue of the fixing of the respective winding body (16, 17) to the perimetric frame.