Method and fixture for twisting end portions of bar conductors, in particular for bar windings of electric machines

摘要

A twisting method is described, for twisting free end portions of bar conductors for the stator or rotor bar winding of an electrical machine. The twisting method allows achieving a non uniform twisting of the bar conductors from the welding side of the stator or rotor core by means of a twisting fixture. The twisting fixture comprises a pocket member including a main structure provided with an arc of adjacent pockets and a secondary structure, provided with at least one further pocket, which can axially translate with respect to the main structure.

主权项

1. A twisting fixture for twisting free end portions of bar conductors for a stator or rotor winding of an electrical machine, said twisting fixture comprising:
at least one pocket member extended about a twisting axis, said pocket member comprising a circular array of pockets having its center on the twisting axis, each pocket of said circular array of pockets being provided with an insertion opening, which is adapted to be passed through by one of said free end portions for inserting such portion into said pocket, the pocket member including:
(a) a main structure adapted to define an arc of adjacent pockets of said circular array of pockets; and(b) a secondary structure movably mounted with respect to the main structure and comprising a further pocket of said circular array of pockets; wherein the secondary structure is axially slidably mounted in a direction of the twisting axis (Z-Z) with respect to the main structure.