作者: Yasunao Otani
DOI:
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摘要: A coil (4) of the present invention is formed by spirally winding a wire rod (40). Furthermore, cross sectional shape (40) constituting has: bent section (44) that in an arc toward center axis (300) (4); flat (45), which provided on outer circumferential side (4), and has with curvature smaller than (R3) (44); at least one protruding (46), boundary area or close to between protrudes adjacent