(Marposs: Auburn Hills, MI) -- Marposs, a world leader in measurement, inspection, and test technologies, has announced a noncontact measuring system for performing dimensional verification of hairpins used in stator windings.

Through optical inspection using three proprietary high-resolution cameras with telecentric optics, this system measures the head, tail, and roof of the hairpin with the goal of keeping lengths, widths, and twisting under control. This helps to avoid problems during rotor assembly, such as preventing damage to the insulation paper inside the rotor slots.

The challenge is producing single hairpins so they properly fit the stator grooves. This is complicated by the fact that hairpins are made of thin copper bar, and therefore inherently weak. Traditional contact systems, or use of reference profile masks/jigs, can easily deform the intended shape.

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