US 4,541,170 AGranted

Method and device for forming the rotor winding coils of a dynamoelectric machine

AssigneeOfficine Meccaniche Pavesi & C. S.p.A.

InventorGiorgio Barrera

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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.

Claims16

Dependent claims

A method of forming the winding coils of a rotor of a dynamoelectric machine and for anchoring the ends of the coils to a commutator associated with the rotor, said dynamoelectric machine being of the type in which the said commutator and rotor each have a hollow cylindrical body and are mounted on a common shaft in positions axially spaced from each other, in which the rotor has a plurality of axially-extending radial slots for receiving the said winding coils, and in which the commutator includes a plurality of radial segments each having a slot at its end facing the rotor;

said method including the steps of:
winding a copper wire in pairs of said slots in the rotor to form the said winding coils,
inserting each coil end in a said slot of the commutator, the starting end of each coil being inserted in the same slot as that in which the terminating end of the previously wound coil is inserted, and
bending the portion of copper wire that lies adjacent the end of each said coil and extends between the rotor and the commutator, towards the said shaft of the rotor immediately before the insertion of the associated coil end in the corresponding slot of the commutator,
wherein the improvement comprises:
effecting the said step of inserting each coil end in the corresponding commutator slot and the preceding step of bending the said portion of copper wire adjacent the coil end towards the rotor shaft, during the step of winding said wire in said commutator slots, and
holding the end of each said coil during the winding of the coil and before the said step of inserting the end of the coil in the corresponding commutator slot, the held coil end being moved axially from a position spaced from said rotor to a position closer to the rotor at the moment at which the said bending operation is effected.

4 more elements

A device for forming the winding coils of a rotor of a dynamoelectric machine and for anchoring the ends of said coils to a commutator associated with the rotor, said dynamoelectric machine being of the type in which the said rotor and commutator each have a hollow cylindrical body and are mounted on a common shaft in positions axially spaced from each other, in which the rotor is formed with a plurality of axially-extending radial slots intended to receive the said coils, and in which the commutator includes a plurality of radial segments each formed with a slot in its axially-extending outer edge at its end facing the rotor;

the device including:
a support structure arrangement,
winding means for winding a copper wire within pairs of said rotor slots to form the various said winding coils,
insertion means for inserting each coil end in a corresponding said slot in the commutator, and
bending means for bending the portion of said wire that is adjacent the said coil end and extends between said rotor and commutator towards the shaft of the rotor immediately before the insertion of each coil end in the corresponding commutator slot, the said winding means, insertion means and bending means being mounted on said support structure arrangement,
wherein the improvement comprises providing the said device with:
gripper means carried by said support structure arrangement and arranged to hold the said coil end temporarily during the formation of the coil and before the operation of said insertion means,
displacing means for displacing said gripper means in the axial direction of said rotor shaft from a position spaced from the rotor to a position closer to the rotor at the moment at which the said bending operation is carried out,
whereby the bending and inserting of the coil end in the corresponding commutator slot can be carried out during winding of said wire in the rotor slots.

6 more elements

Dependencies are inferred from the claim text.