| 摘要 |
PURPOSE:To obtain an excellent magnetic characteristic while improving workability by a method wherein thin iron plates are punched, the punching direction is inverted at every predetermined number, the iron plates are laminated, and the laminated iron plates are fastened through a fastening means by welding, etc. CONSTITUTION:The desired stator core is acquired in such a manner that the thin iron plates are punched, and the thin iron plates 7 laminated in the punching direction and the thin iron plates 8 laminated with inverting the punching direction are laminated by inverting the punching direction alternately for every one sheet, fastened through welding at welding sections 4 at six positions on an outer circumference, and annealed at a temperature such as 750 deg.C. Accordingly, since adhesion due to returns 6 is limited to every at least two sheets, the increase of overcurrent loss is inhibited, the magnetic characteristic can be improved and the workability can be ameliorated. |
