Patent ID: 7574790

Claim:
A method for manufacturing a stator of an electrical rotating machine, the stator including a laminated magnetic circuit having a stack of magnetic metal sheets disposed substantially parallel to a plane perpendicular to the axis of rotation of the rotor of the machine, the magnetic circuit having a plurality of teeth, the teeth delimiting longitudinally oriented slots of a slot region, the method comprising steps of: installing electrically conductive wires in the slots and forming first and second winding heads respectively at two axial ends of the magnetic circuit; installing on a vertical axis an assembly that includes the magnetic circuit supporting the conductive wires in the slots of the slot region and the first and second winding heads; impregnating the first winding head, in an axially upper position, with a first composition that includes a heat-setting resin and a filler of a first particle size; turning the assembly upside down so that the first winding head is in an axially lower position and the second winding head is in the axially upper position; impregnating under vacuum substantially an entirety of the slot region, while the assembly is upside down, with a slot-impregnating composition that includes a heat-setting resin and another filler of a second particle size smaller than the first particle size of the filler of the first composition; impregnating the second winding head with a composition that includes a heat-setting resin and a filler of a particle size larger than the second particle size; and polymerizing the compositions.