Abstract

A method and a device for forming the rotor winding coils of a dynamoelectric machine and for anchoring the ends of the coils in slots provided in a commutator associated with the rotor. The method comprises the steps of winding a copper wire around pairs of rotor slots to form the various coils of the winding, inserting each coil end in a commutator slot, the starting end of each coil being inserted in the same slot as that in which the end of the previously wound coil is inserted, and bending the portion of copper wire that is adjacent the end of the coil and extends between the rotor and the commutator, towards the rotor shaft immediately before the insertion of each coil end in the corresponding commutator slot. The said step of insertion of each coil end in the corresponding commutator slot and the preceding step of bending the portion of copper wire adjacent the end of the coil towards the rotor shaft, are carried out during the winding of the wire in the rotor slots. During the winding of each coil, and before the said step of inserting the end of the coil in the corresponding commutator slot, the end of the coil is temporarily held by ancillary gripper means which are moved axially from a spaced position to a position closer to the rotor at the moment at which the said bending operation is carried out.