| 摘要 |
PURPOSE:To reduce a dovetail stress by composing so that the contacting surface of a cock with a dovetail and the line for connecting the root of the dovetail to the inside center of the dovetail become perpendicular. CONSTITUTION:A magnetic pole 1 has a flared projection 4 formed toward the inside called ''a dovetail'', and a rotor ring 3 has a dovetail groove 5 of similar shape to the dovetail 4. The pole 1 is secured to the rim 2 by inserting the dovetail 4 into the groove 5 of the rim 2 and press-fitting a cotter 3 into the air gap produced between the dovetail 3 and the groove 5. At this time, the angle beta formed between the contacting surface of the cotter 3 with the dovetail 4 and the line for connecting the root of the dovetail 4 and the inside center of the dovetail is 90 deg.. In this manner, the dovetail stress can be reduced, thereby improving the buckling strength. |
