Patent ID: 8561447

Claim:
Twisting device ( 10 ) adapted to simultaneously twist a plurality of electric bar conductors ( 11 ) for making a stator or rotor winding for an electric machine, comprising: at least one first body ( 12 ) extending around a twisting axis (Z-Z) and comprising a first circular array of channels ( 15 ) having centre on such an axis (Z-Z); and at least one second body ( 13 ), extending around and coaxial with the first body ( 12 ), comprising a second circular array of channels ( 16 ) with centre on the twisting axis (Z-Z); a channel ( 15 ) of said first array and a channel ( 16 ) of said second array being adapted to be placed side by side and aligned radially (RR) to one another with respect to the twisting axis (Z-Z) to respectively receive a first and a second arm ( 11 B, 11 C) of one of said bar conductors ( 11 ), the first and/or second body ( 12 , 13 ) being adapted to be set in rotation around said axis (Z-Z) to move such arms apart ( 11 B, 11 C) by a predetermined amount; the twisting device ( 10 ) being characterised in that it comprises, associated with each of the channels ( 15 ) of at least one of said first and second array, a channel extension groove ( 15 A) extending longitudinally in a direction parallel to the twisting axis (Z-Z) and projecting from the respective channel ( 15 ) in a direction (CC) circumferential with respect to said axis (Z-Z).