Winding – tensioning – or guiding – Composite article winding – On internally toothed core
Reexamination Certificate
2000-03-30
2001-03-27
Walsh, Donald P. (Department: 3653)
Winding, tensioning, or guiding
Composite article winding
On internally toothed core
C242S432600, C029S596000
Reexamination Certificate
active
06206319
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to an apparatus for winding dynamoelectric machine field windings and, more particularly, to such an apparatus including a mechanism for preventing the field windings from moving out of a desired position on a stator during a winding operation.
2. Related Prior Art
Stator coil winding, machines are well known that use a moving wire dispensing element for dispensing wire into stator core slots from end to end of the stator core, passing over the end of the core and to an appropriate return slot, returning axially to the opposite core end, and continuing this motion until the coil is completed. One recognized shortcoming of such winding operations is the tendency of the wire forming the coil to move out of the slots of the stator core radially inwardly toward the interior of the stator core, such as may result from tension applied to the wire as the dispensing element is moved between the stator core ends to position the wire in a slot, which may interfere with the proper performance of the winding operation, result in misformed coils, as well as reduced slot fill.
The prior art has proposed various mechanisms for overcoming the problem associated with movement of the wire windings during the winding operation. For example. U.S. Pat. No. 3,414,204 to Friedrich discloses providing wire guiding fingers located adjacent end faces of a stator being wound. In operation, wire is wound over the fingers whereby the wire is held in a desired position as the stator is being wound.
In an alternative approach, shroud members are provided on either end of a stator wherein the shroud members define guiding surfaces for guiding wire into the stator core slots and for preventing the wire from falling to the interior of the stator core, such as is disclosed in U.S. Pat. No. 3,648,938 to Dryburgh.
U.S. Pat. No. 4,498,636 to Boesewetter discloses a further approach to maintaining the field windings within the stator core slot wherein a cylindrical winding tool is formed to closely fit within the interior of the stator core and includes opposing ends extending beyond the ends of the stator core such that the winding tool effectively closes off the slot openings to prevent wire from exiting into the interior of the stator core during the winding operation. However, this approach does not control movement of wire in the stator core slots to prevent displacement toward the central portion of the stator which can result in reduced slot fill.
Accordingly, in spite of the above described mechanisms for improving the operation of forming dynamoelectric field windings, there is a continuing need for a simple and effective mechanism for maintaining the field windings immovably in place on the stator core during the winding operation.
SUMMARY OF THE INVENTION
The present invention provides an apparatus for winding dynamoelectric machine field windings including a stator support for engaging and supporting a stator and a winding tool supported for reciprocating movement relative to the stator support. As the winding tool is reciprocated through a stator mounted on the stator support, wire is fed from a wire feed aperture in the side of the winding tool and into slots defined by radially inwardly extending teeth of the stator.
The winding tool is further supported for rotating or oscillating movement about a longitudinal axis of the winding tool. At each end of the reciprocating stroke of the winding tool, the winding tool is rotated to align the wire feed aperture with a different slot of the stator wherein the rotating movement of the winding tool corresponds to the formation of an end turn of the field winding or coil being formed within the stator.
A pair of wire holders or wire clamps are provided supported on the winding tool for reciprocating movement relative to the stator. A spring associated with each of the wire clamps biases each respective wire clamp toward the stator, and each wire clamp includes a surface extending substantially perpendicular to the longitudinal axis of the winding tool for engaging an end of the stator.
In operation, the wire clamps are alternately engaged with and disengaged from respective ends of the stator. In particular, as the winding tool is reciprocated to move the wire feed aperture along an internal slot of the stator core. and away from one end of the stator, a wire clamp is engaged with the end turns of field windings associated with the end of the stator from which the wire feed aperture is moving. The spring associated with the wire clamp permits the winding tool to move relative to the wire clamp while resiliently biasing the wire clamp against the end of the stator, and thus prevent radial inward movement of the wire as tension is applied to the wire.
Therefore, it is an object of the present invention to provide an apparatus for winding dynamoelectric machine field windings including providing a mechanism for engaging an end portion of a stator in cyclical engagement in order to hold the end turns of field windings in place.
It is a further object of the invention to provide such an apparatus wherein the means for engaging the ends of the stator include wire clamps mounted for reciprocating movement with a winding tool for the apparatus.
It is yet another object of the invention to provide a pair of winding clamps for alternately engaging with and disengaging from respective ends of a stator to facilitate maintaining field windings in place.
Other objects and advantages of the invention will be apparent from the following description, the accompanying drawings and appended claims.
REFERENCES:
patent: 2998937 (1961-09-01), Potter et al.
patent: 3253792 (1966-05-01), Brown et al.
patent: 3334825 (1967-08-01), Friedrich
patent: 3414204 (1968-12-01), Friedrich
patent: 3648938 (1972-03-01), Dryburgh
patent: 3716199 (1973-02-01), Ericson
patent: 4498636 (1985-02-01), Boesewetter et al.
patent: 4679312 (1987-07-01), Nussbaumer et al.
patent: 5485670 (1996-01-01), Bouman et al.
patent: 5586383 (1996-12-01), Dolgas et al.
patent: 5732900 (1998-03-01), Burch
Biebel & French
Lebinal Components & Systems, Inc.
Marcelo Emmanuel M.
Walsh Donald P.
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