Coil winding method for maximum utilization of winding envelope
AssigneeGeneral Motors Corporation
InventorCarl E. Young
Life of this patent
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Abstract
A coil winding method wherein only one-half turn is wound in the bottom slot of the first layer of the coil. This results in the loss of one-half turn, but causes the normal crossover from the first layer to the second layer to occur on the side of the coil opposite the lead-end. The last one-half turn of the second layer wound in the bottom slot of the first layer, thereby recovering the lost one-half turn. Additional turns are added in this manner until approximately one-half of the layers have been wound. Thereafter, the usual progressive winding method is employed. As a result, crossover related build-up in the completed coil is distributed between opposite sides of the coil and the number of turns within the allowable profile is substantially maximized.
Claims3
A method of winding a coil on a coil form, where the coil is defined by substantially concentric layers of coil turns, each such layer being defined by a plurality of coil turns placed in successive slots along the axis of the coil form, said method comprising the steps of:
- winding a plurality of coil turns using a first winding technique in which approximately one-half of the starting slot of the first layer defined by such turns is initially left vacant, and thereafter filled by a coil turn from a subsequently wound layer defined by such turns, thereby to define a first group of coil layers in which coil turn crossings that cause a bulge in the coil profile occur on a first end of the coil;
- and
- winding a plurality of coil turns using a second winding technique in which an entire coil turn is placed in the starting slot of the first layer defined by such turns, thereby to define a first group of coil layers in which coil turn crossings that cause a bulge in the coil profile occur on a second end of the coil opposite said first end.
A coil of conductive turns wound in substantially concentric layers about a coil form, each such layer being defined by a plurality of coil turns placed in successive slots along the axis of the coil form, the improvement wherein:
- the coil comprises four or more layers;
- at least two of said layers are wound such that one-half of the starting slot of the first of said two layers is initially left vacant, and thereafter filled by a coil turn from the second of said two layers, whereby crossings of the coil turns between such two layers which result in a bulge in the coil profile occur on a first end of the coil;
- and
- the remaining layers are wound such that a complete coil turn is placed in the starting slot of the first such remaining layer, whereby crossings of the coil turns between such remaining layers which result in a bulge in the coil profile occur on a second end of the coil opposite said first end.
Dependencies are inferred from the claim text.