| 摘要 |
PURPOSE:To improve the buckling strength of a laminated pole core in its inner periphery by producing rotary moment which compresses the inner periphery when a pole is bent by centrifugal force at a pole terminal board. CONSTITUTION:A dovetail 3a of a pole core 3 at its inner peripheral side and a dovetail 4a of a pole terminal board 4 at its inner peripheral side are engaged with an axial dovetail groove 2a having the same shape formed at the outer periphery of a rim 2, and the engaging part serves to hole the centrifugal force of the pole. Recess grooves 6 which axially pass are formed at both peripheral sides of the core 3 and the board 4, an axial through plate 7 of the groove 6 is engaged with the groove, the plate 7 is welded to the groove, thereby axially connecting the core 3 and the board 4. Further, an air gap a is formed at the centrifugal force holding surface which contacts the dovetail 3a of the core 3 at its inner peripheral side with the rim 2 by the centrifugal force. |
