| 摘要 |
A magnetic circuit is made by magnetically attracting a permanent magnet segment of a partially circular arc in cross section to an outer peripheral surface of a center rod, causing the magnet segment in a magnetically attracted state to face a yoke member, using a nonmagnetic supporter to regulate the magnet segment in position, extracting the center rod from the magnet segment in a position-regulated state, and magnetically attracting and fixing the magnet segment to the yoke member.
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