| 摘要 |
PURPOSE:To prevent a clamping force from decreasing due to temperature rise by forming a stud bolt of a material which has a linear expansion coefficient smaller than that of a sector punching plate. CONSTITUTION:A plurality of sector punching plates 10 of sector shape are laminated, and aligned annularly to form annular layers. The layers are stacked by displacing coupling portions between the punching plates at a distance corresponding to one or more pitches of the stud holes to construct a cylindrical rotor core. Stud bolts 25 are penetrated via the stud bolt through holes 13 of the annularly laminated punching plates, and the laminate is integrally clamped. The bolts 25 are formed of a material which has a linear expansion coefficient smaller than that of an electric iron plate of the sector punching plate. Thus, as the temperature rises, additional clamping effect arises to hold the complete cylindrical shape at the rotating time. |
