Single coil of coil unit for linear motor and winding former thereof

A winding former for manufacturing the single coil of a coil unit for a linear motor wherein

• an entire coil has an approximately rectangular ring-like shape, two sides of said rectangle opposing to each other function as a pair of effective conductors for contributing to generating a thrust force for a moving body of the linear motor, and the other two sides opposing to each other function as a pair of connecting conductors for connecting between the effective conductors, comprising:
• a first piece which is stored inside the two sides for serving as the effective conductors, extends outside of the two sides for serving as the connecting conductors, and has a pair of first winding parts on which said connecting conductors are wound respectively;
• and
• a second piece which is stored inside the two sides for serving as the connecting conductors, extends outside of the two sides for serving as the effective conductors, and a pair of second winding parts on which said effective conductors are wound respectively;
• wherein the first piece and the second piece are overlapped crisscross and detachably while they are opposing to each other,
• flanges for serving as guides for the parallel sides of the trapezoid are respectively formed at the ends of the first winding parts of the first piece protrudingly toward the second piece,
• the first winding parts of the first piece are formed such that the distance from said first piece to the second piece increases as it measures closer to the ends of the first winding parts, and
• a conductive wire is wound while the conductive wire is being sequentially locked to four crossing parts formed when the first piece and the second piece are overlapped crisscross.