Method and apparatus for developing electrical coils

Abstract

Abstract Method and apparatus for axially developing electrical coils in selected slots of a stator core for a dynamoelectric machine. In the exemplified approach, two strands of wire are wound in hand, i.e., wound simultaneously, to generate one or more electrical coils having two or more turns each. Coils are transferred axially into slots of stator core firmly supported in a predetermined position relative to the coil generation means. Transfer and insertion is done in known manner. Indexing means may also be provided and used to either re-orient the stator core relative to the coil placing means for receipt of other coils or core may be positioned and oriented in a predetermined position relative to a second winding and/or placing means spaced from the first coil placing means. Two or more strands of wire are substantially simultaneously dispensed by flyer means moving in a substantially constant and fixed path about arbor or coil form means that establish a predetermined desired shape for the turns of each coil. As the flyer means moves, the multiple strands of wire tend to twist one upon another. However, along at least two predetermined portions of each coil being developed, the wire strands are prevented from twisting or crossing one upon another. Arbor means have predetermined ''''no twist'''' locales adjacent which are located those portions of the coils that are to enter restricted core slot entrances. In the case of generally arcuate divider blades or plates, a recessed or relieved area is provided along a preselected central region of at least selected ones of the divider blades to encourage and accommodate twisting of wire strands while being placed against the divider blades. Recess preferably is of a depth at least equal to twice the diameter of a maximum strand size to be flyer wound. The recess or undercut in each divider blade has a divider blade no-twist locale at each side thereof. The arcuate length of each no twist locale is not critical and may be made to be, for example, about one quarter of an inch. The axial extent of the recessed surface is preferably at least approximately as great as the axial length, i.e., stack height of a core with which the apparatus is to be used. As the wire is pulled across a no-twist locale, relatively high wire tension, i.e., relatively high pressure between the wire and arbor means rather than simple strand tension, occurs and is believed to contribute to the advantageous results. Since the wire strands preferably do not contact undercut regions of the arbor means, no pressure will be exerted therebetween.

Inventors

• 👤 R Arnold

Bibliographic Details