Wireworking – Article making or forming – Forms and frames
Patent
1983-12-09
1986-04-08
Larson, Lowell A.
Wireworking
Article making or forming
Forms and frames
B21F 300
Patent
active
045806063
ABSTRACT:
Apparatus for forming stator coils constituted by multi-lobed turns, for dynamo-electric machines, comprises a first circumferential series of forming elements located at equal distances from a central axis and equiangularly spaced from each other, and a second circumferential series of forming elements equiangularly located about the said central axis and intercalated between the forming elements of the first series. The forming elements of the second series are moveable radially relative to the said central axis between an outer position which is spaced from the central axis by a distance greater than the distance between the central axis and the forming elements of the first series, and an inner position which is spaced from the central axis by a distance less than the distance between the central axis and the elements of the first series. A copper wire is wound about the first circumferential series of forming elements to form a polygonal coil and the forming elements of the second series are moved radially inwardly against the sides of the polygonal coil so as to curve these sides towards the center of the coil. The forming elements of the first series are free to move radially towards the central axis as a result of the thrust exerted against the sides of the polygonal coil by the elements of the second series. Automatic operating devices are provided for clamping one end of the copper wire to one of the forming elements of the first series before the start of the winding operation and for cutting the copper wire at the end of the winding operation.
REFERENCES:
patent: 3559699 (1971-02-01), Droell
patent: 3874424 (1975-04-01), Muskulus
patent: 4121627 (1978-10-01), Schmid
Larson Lowell A.
Officine Meccaniche Pavesi & C. S.p.A.
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