US 12,088,158 B2
Cold pressure welding apparatus, coil manufacturing apparatus, coil, and method of manufacturing the same
Takenobu Hongo, Fukushima (JP)
Assigned to ASTER CO., LTD., Yokote (JP)
Filed by ASTER CO., LTD., Yokote (JP)
Filed on Jun. 30, 2022, as Appl. No. 17/810,190.
Application 17/810,190 is a division of application No. 16/864,953, filed on May 1, 2020.
Application 16/864,953 is a division of application No. 16/116,188, filed on Aug. 29, 2018, granted, now 10,742,097, issued on Aug. 11, 2020.
Application 16/116,188 is a division of application No. 15/105,485, granted, now 10,211,710, issued on Feb. 19, 2019, previously published as PCT/JP2014/083556, filed on Dec. 18, 2014.
Claims priority of application No. 2013-261581 (JP), filed on Dec. 18, 2013; and application No. 2014-252885 (JP), filed on Dec. 15, 2014.
Prior Publication US 2022/0337135 A1, Oct. 20, 2022
Int. Cl. B23K 20/00 (2006.01); B23K 20/02 (2006.01); H01F 41/061 (2016.01); H02K 15/00 (2006.01); B23K 101/38 (2006.01); H01F 27/28 (2006.01)
CPC H02K 15/0068 (2013.01) [B23K 20/02 (2013.01); B23K 20/028 (2013.01); H01F 41/061 (2016.01); B23K 2101/38 (2018.08); H01F 27/2847 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A coil manufacturing method comprising the steps of:
preparing a plurality of strip-shaped flat conductors capable of forming a helical structure when continuously joined together, and
pressing end faces of the plurality of flat conductors against each other along a strip longitudinal direction and thus shortening distances thereof in the strip longitudinal direction to cold pressure weld the end faces together,
wherein the end faces have a cross section perpendicular to the strip longitudinal direction, and
wherein a region of one turn of the helical structure comprises a first linear portion extending along a first direction, a second linear portion extending along a second direction, and a bent portion connecting the first linear portion and the second linear portion therebetween, and
wherein a welded portion of the flat conductors is formed at an area excluding the bent portion; and
integrally coating the formed helical structure with a resin material.