As for this invention formation process of the winding in the cylindrical shell is included, it regards the production method of the coil which generates the generally known strongly magnetic field the occasion where electric current passes. Formation process of the aforementioned winding, the process which at least forms one convex section in every circumferences of the aforementioned coil winding, furthermore consists of the process which forms at least one concave section of the form which corresponds to the aforementioned convex section with respect to 1 winding which it adjoins, the result aforementioned convex section of the arrangement protrudes in coil axis direction vis-a-vis the aforementioned concave section, features that the mechanical stress which electromagnetic power brings and the mechanical deformation which is by the thermal beginning are absorbed. In addition this invention has the shell which designates the conductive material as the material, forms winding by being quarried out alongside the notch line which all is provided helically on the said shell, the said coil provides one convex section for every circumferences of winding at least in regard to the coil which generates the generally known strongly magnetic field the occasion where electric current passes, the said convex section features that it protrudes in coil axis direction vis-a-vis the concave section which was formed on 1 winding which it adjoins.本発明は円筒状管体における巻回の形成工程を含む、電流が通過した際にいわゆる強磁場を発生させるコイルの製造方法に関する。前記巻回の形成工程は、前記コイル巻回の1周回毎に少なくとも1つの凸部を形成する工程、さらには隣接する1巻回上に前記凸部に対応する形状の少なくとも1つの凹部を形成する工程からなり、その配置の結果前記凸部は前記凹部に対してコイル軸線方向に突起し、電磁力がもたらす機械的応力及び熱的起源による機械的変形を吸収することを特徴とする。また本発明は、導電体を素材とする管体をそなえ、該管体上に全螺旋状に設けられた切欠線に沿って切り出しされることにより巻回を形成し、電流が通過した際にいわゆる強磁場を発生させるコイルに関し、該コイルは巻回の1周回毎に少なくとも1つの凸部をそなえ、該凸部は隣接する1巻回上に形成された凹部に対してコイル軸線方向に突起することを特徴とする。
