Armature Winding End Joining to Prevent Strand Untying

The patent applies preliminary action by pre-forming a joint portion at the end of the conductive wire material before the strands can untie. The outer insulating layer is peeled off to expose the conductor, and the joint portion is formed by welding or crimping the exposed conductor ends together. This preliminary joining prevents the strands from untying during subsequent handling and assembly operations, thereby preventing the increase in eddy current loss that would result from strand separation.

The patent applies segmentation by dividing the conductive wire material into distinct functional portions: an outer insulating layer portion, a joint portion where the outer insulating layer is peeled off and conductors are joined, and a conductor portion. This segmentation allows the outer insulating layer to be selectively removed only at the end portion to expose the conductor for joining, while the rest of the wire maintains its insulating coverage. This targeted approach ensures electrical continuity at the joint while minimizing the complexity of the manufacturing process by limiting the peeling and joining operations to specific locations.

The patent applies local quality by applying varnish selectively to specific portions of the conductive wire material rather than uniformly to the entire wire. The varnish is applied to suppress untying of the strands at critical locations such as the joint portion and areas where strands are prone to separation, while other portions of the wire maintain their original properties. This localized treatment provides the necessary strand stability where needed without requiring time-consuming universal varnishing of the entire conductor assembly.