| 摘要 |
PROBLEM TO BE SOLVED: To obtain a laminated core forming a groove insulation by coating in which good coating insulation film free from pinhole is formed by removing inner bubbles using a small groove, formed between core thin plates opening to the inside and outside diameters not coated with a coating material, as a vent in the process for forming the insulating film in the coating work. SOLUTION: The laminated core is arranged such that on the surface on one side of the magnetic pole portion of a core thin plate, a small radial groove 3 opening to the inside and outside circumferential surfaces of the core thin plate 1 is provided in the end, a surface provided with the small radial groove is laminated to butt against the surface of an adjacent core thin plate on the side opposite to the surface provided with the small radial groove, and a ventilation space communicating with the inside and outside diameters in the radial direction is formed on one surface of each core thin plate, and the surface on the opposite side corresponding to the small radial groove is formed by punching while sustaining flat plane. COPYRIGHT: (C)2007,JPO&INPIT
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