Patent ID: 8091206
Filing Date: 2012-01-10
Classification: H02K,Y10T

Abstract:
1. A method of producing a coil assembly for use in an electric rotary machine, the coil assembly being to be wound in a core in which a plurality of slots are formed, the coil assembly including at least a first and a second coil wire each of which has a length made up of in-slot portions to be disposed in the slots of the core and turned portions, the in-slot portions extending substantially straight in parallel to each other, each of the turned portions connecting between adjacent two of the in-slot portions, the turned portions being located on a first side and a second side opposed across the width of a corresponding one of the first and second coil wires alternately, the method comprising the steps of: an arrangement step of arranging the first and second coil wires substantially in parallel to each other, with the turned portions of the first coil wire being offset from those of the second coil wire in a lengthwise direction thereof; an engagement step of moving the first coil wire substantially parallel to the second coil wire in a widthwise direction thereof to establish engagement of a first turned portion that is one of the turned portions of the first coil wire located on the first side with a first turned portion that is one of the turned portions of the second coil wire located on the second side; a first turning step of turning a portion of the first coil wire, as located on a side of the engagement, relative to a portion of the second coil wire, as located on the side of the engagement, in the widthwise direction about a pivot where the first turned portions of the first and second coil wires engage; a crossing step of crossing the portion of the first coil wire over the portion of the second coil wire around the pivot; a second turning step of turning the portion of the first coil wire around the pivot relative to the portion of the second coil wire in a direction opposite that in the first turning step; and a moving step of moving the first coil wire relative to the second coil wire to place the first and second coil wires so as to extend substantially parallel to each other in the lengthwise direction thereof to twist the first turned portions of the first and second coil wires together.