摘要 |
PURPOSE:To improve rectifying characteristics of an apparatus by removing an insulating coating layer in the right place of coil strands to expose inner conductors and by forming a commutator segment in the peripheral face of said inner conductors. CONSTITUTION:A coil wire-bundle 2 is twisted so that an inner coil body 4a and an outer coil body 4b are formed into a mutual telescopic structure. Then, Gaps G provided between respective coil wire-bundles 2 are caused to coincide completely with each other on the upper end side and to deviate from each other by one coil strand 1 circumferentially on the lower end side. In said state, radially adjacent coil strands 1 of said inner coil body 4a and outer coil body 4b are connected with each other to form a wave winding coil. In the right place of the outer peripheral face of said outer coil body 4b of a coreless armature thus obtained, the insulating coating layer 3 of respective coil strands 1 is removed over the whole periphery and inner conductors 5 are exposed to form a commutator segment. Therefore, a large contact area with a brush and a smooth contact can be obtained to improve rectifying characteristics of an apparatus.
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