Manufacturing method of assembly conductor, and electric motor provided with assembly conductor

An assembly conductor manufacturing method comprising:

• aligning, around a center strand, a plurality of peripheral strands, each having at least two side surfaces, one of which opposes an adjacent peripheral strand on one side in a circumferential direction and the other of which opposes an adjacent peripheral strand on the other side in the circumferential direction, so as to form an assembly conductor in which the center strand and the peripheral strands are aligned;
• twisting the plurality of peripheral strands around the center strand to form a twisted assembly conductor;
• and
• deforming the twisted assembly conductor into a substantially rectangular sectional shape, wherein
• the peripheral strands provided with the two side surfaces each have a sectional shape in which a width between the side surfaces becomes narrower toward the center strand,
• an inner peripheral surface that contacts an end portion of each of the two side surfaces on the side near the center strand, and that opposes the center strand, is formed on each peripheral strand,
• a clearance is provided between the side surfaces of peripheral strands that are positioned adjacent to each other while the inner peripheral surface of each peripheral strand is contacting the center strand, when the peripheral strands are aligned around the center strand,
• the clearance is reduced while the inner peripheral surface of each peripheral strand is contacting the center strand when the plurality of peripheral strands are twisted,
• when aligning the peripheral strands, a length W0 in the circumferential direction between the two side surfaces of the peripheral strands satisfies Expression (1) below at a distance d/2 from the center of the assembly conductor,
• W0≤π·d/n·P/√(π2·d2+P2) (1)
• where d/2 is a distance from the center of the assembly conductor after alignment, n is the number of peripheral strands, and P is a twist pitch corresponding to one twist of the assembly conductor after twisting.