| 摘要 |
PURPOSE:To reduce the thermal loss of the head of a pole of a rotor at the starting time by forming slits of different size in an inverted trapezoidal shape at both axial ends of the heads of the poles in different number at the advancing rotating side and delaying rotating side of the poles. CONSTITUTION:A salient-pole type lumped pole 10 is formed by dividing into a body 11 and a head 12 in a structure integrally associated by clamping both 11, 12 with bolts 13, and rotor windings 14 of field winding are wound on both. Slits 17a, 17b which extends the heat sink area are formed at the head 12. The number of slits 17a at the advancing rotating side F1 is increased more than that of slits 17b at the delaying rotating side F2. Further, the slits 17a3, 17a2 of both sides are increased in number more than slits 17a1 at the center. The slits 17a, 17b are formed in shape that the surface of the head 12 is widest and the head becomes gradualy narrower toward the depthwise direction in an inverted trapezoidal shape. |
