| 摘要 |
A troidal core is provided to reduce an amount of coils by winding the coil around a main body with a constant distance. A troidal core(100) includes a ring-like main body(110) and plural guide bumps(120,130), which are formed on the main body. The guide bumps are formed on the main body with a constant distance along a circumferential direction. Side portions of the guide bumps support the coils, so that the coils are wound around the main body with a constant distance. The guide bumps are formed on an inner or outer side of the main body.
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