Method of plugging armature slots
AssigneeBriggs & Stratton Corporation
InventorsJohn D. Santi, Edward A. Boyd
Life of this patent
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Abstract
To form winding slot plugs in a dynamoelectric machine armature, viscous uncured plastic is fed onto the cylindrical surface of the armature core, intermediate its ends, while the armature is rotated in contact with a paddle that wipingly forces the plastic into the winding slots. Preferably this is done simultaneously with coating the windings. The viscous plug material comprises the same plastic used for coating the windings, but admixed with enough inert powered material to be nonflowing.
Claims6
The method of plugging the mouths of axially extending, radially outwardly opening winding slots in a substantially cylindrical dynamoelectric machine rotor core to confine in said slots lengths of conductors which comprise the rotor windings of the machine and which are all disposed radially inwardly of opposite ledges that project towards one another across each slot to define a narrow mouth for it, said method being characterized by:
- A. supporting the core for rotation about a fixed axis with its circumferential surface bearing against a substantially flat surface of a paddle at least along a zone of the core that is intermediate its ends;
- B. depositing between said surface and the rotor core in said zone a quantity of a plastic insulating material that can be cured to substantial hardness and which material is sufficiently viscous to resist flow under the force of gravity;
- C. effecting rotation of the rotor core about its axis relative to said paddle to wipingly force said material into the axially medial portions of the winding slots and under the ledges thereof so that the material thus forced beneath the ledges can form a mechanical interlock with the core;
- and
- D. curing said material.
The method of plugging the mouths of axially extending, radially outwardly opening winding slots in a substantially cylindrical dynamoelectric machine rotor core to confine in said slots lengths of conductors which comprise the rotor windings of the machine and which are are disposed radially inwardly of opposite ledges on the core that project towards one another across each slot to define a narrow mouth for it, said method being characterized by:
- A. depositing onto the circumferential surface of the rotor core, intermediate the ends thereof, a quantity of a plastic insulating material which can be cured to substantial hardness and which is sufficiently viscous to resist flow under the force of gravity;
- B. by relative rotation of the rotor core about its axis, with the circumferential surface of the core in proximity to a substantially flat surface, wipingly forcing said material into the axially medial portions of the winding slots and under the ledges thereof so that the material thus forced beneath the ledges can form a mechanical interlock with the core;
- and
- C. curing said material.
Dependencies are inferred from the claim text.