From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Specifications table for armature windings of various S.S. motors.
| Identifier | ExFiles\Box 68\4\ scan0198 | |
| Date | 29th September 1919 | |
| X.1640 x.523 x.8843 29.9.19. TABLE OF ARMATURE WINDINGS (S.S. MOTORS) Machine: R.R.45A., R.R.17., R.R.24, Lucas A.S10., C.A.V., Bosch., Bliur (6 Volt)., R.R.45B. Number of poles (even) (p): 4, 4, 4, 4, 4, 4, 4, 4 Number of slots (s): 45, 17, 24, 43, 21, 41, 21, 45 Type of winding.: Progressive wave. Two circuit., Retrogressive wave. Two circuit., Progressive lap. Four circuit., Retrogressive wave. Two circuit., Progressive wave. Two circuit., Progressive wave. Two circuit., Progressive wave. Two circuit., Progressive wave. two circuit. Number of conductors (n¹): 90, 102, 384, 86, 84, 82, 84, 90. Conductors per slot (n¹/s): 2, 6, 16, 2, 4, 2, 4, 2 Coils per slot (c/s): 1, 3, 2, 1, 1, 1, 1, 1 Number of coils & com. bars. (c): 45, 51, 48, 43, 21, 41, 21, 45 Turns per coil (n¹/2c): 1, 1, 2 series 4½ par:, 1, 2, 1, 2, 1 Virtual conductors (ac): 90, 102, 96, 86, 42, 82, 42, 90 Winding pitch in virtual conductors (z): 23, 25, 25 forward 23 backward, 21, 11, 21, 11, 23 Winding pitch step in slots.: 11 coil 12 com., 4 coil 4 & 5 com., 6 coil 5 & 6 com., 10 11, 5 6, 11 10, 5 6, 11 coil 12 com. | ||