Laminated iron core and manufacturing device and manufacturing method therefor

A manufacturing device for a laminated iron core for joining multiple iron core laminae by successively forming multiple spot-shaped welded parts on the multiple iron core laminae that are stacked, the manufacturing device comprising:

• a laser irradiation unit configured to irradiate spot-shaped laser light onto the multiple iron core laminae thereby to form the multiple welded parts;
• and
• a laser controller configured to control irradiation of the laser light by the laser irradiation unit,
• wherein, under control of the laser controller, the laser irradiation unit
• forms first welded parts, which constitute the multiple welded parts, at a first pitch in a stacking direction on a first iron core lamina group composed of a part of the multiple iron core laminae, and
• forms second welded parts, which constitute the multiple welded parts, at a second pitch in the stacking direction on a second iron core lamina group composed of a part of the multiple iron core laminae adjoining the first iron core lamina group, and
• wherein the second pitch is greater than the first pitch.

A laminated iron core comprising multiple iron core laminae joined by multiple spot-shaped welded parts successively formed on the multiple iron core laminae that are stacked,

• wherein the multiple welded parts comprise:
• first welded parts formed at a first pitch in a stacking direction of the multiple iron core laminae on a first iron core lamina group composed of a part of the multiple iron core laminae;
• and
• second welded parts formed at a second pitch in the stacking direction on a second iron core lamina group composed of a part of the multiple iron core laminae adjoining the first iron core lamina group, and
• wherein the second pitch is greater than the first pitch.