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).
Continuation of a comparative table of armature winding specifications for various S.S. motors.
| Identifier | ExFiles\Box 68\4\ scan0199 | |
| Date | 20th December 1931 | |
| -2- TABLE ARMATURE WINDINGS (S.S. MOTOR) (CONTD) | Machine. | R.R. 45A. | R.R. 17. | R.R. 24 | Lucas A.510. | C.A.V. | Bosch. | Bijur 6 volts. | R.R. 45B. | |---|---|---|---|---|---|---|---|---| | Armature dimensions. | 3 1/8" x 2 1/4" | 3 1/8" x 2 9/16" | 3 1/8" x 2 9/16" | 2.90" x 2.85" | 3 11/16" x 2 7/8" | 3.55 x 3.00 | 3 1/8" x 2 1/4" | | Commutator dimensions. | 2 7/16" x 1 1/4" | 2 7/16" x 1 1/4" | 2 7/16" x 1 1/4" | 1.75" x 1.15" | 2 7/8" x 7/8" | 2.00 x 1.20 | 2.400" x 1.250. | | Brush contact area. | 2 x 1.00" x .375" = .75 sq." | 2 x 1.00" x .375" = .75 sq." | 2 x 1.00" x .375" = .75 sq." | 1 x .360" sq." | 1 x .60" x .25" = .15 sq." | 2 x .18 sq" = .36 sq" | 1 x 1.00" x .25" = .25 sq." | 1 x 1.00" x .375 = .75 sq." | | Armature resistance at 15°C (w) | .0114 | .0150 | .0195 | .00845 | .00864 | .00952 | .00157 | .0116 | | Air gap. | .025" | .025" | .025" | .015" | .031" | .017" | .025" | .025" | | Weight of Armature | 11 lbs. 9 ozs. | 11 lbs. 1 oz. | 10 lbs. 10 ozs. | 7 lbs. 10 1/2 ozs. | 6 lbs. 15 ozs. | 11 lbs. 0 ozs. | 11 lbs. 4 ozs. | 10 lbs. | | Weight of Copper on Armature. | 1.500 lb. | 1.600 lb. | 1.006 lb. | 1.660 lb. | 1.250 lb. | 1.410 lb. | | 1.500 lb. | | Grade and hardness of brushes. | C.M. 1. Morganite | C.M. 1. Morganite | C.M. 1. Morganite | C.M. 4. Morganite | C.M. 1. Morganite | Copper Carbon. Softer & probably of larger % of Carbon. | Copper Carbon. Like apparently by colour. Harder than R.R. Stdd. C.M.1. | C.M. 3 Morganite. | Faint text in left margin: R.R. D.{John DeLooze - Company Secretary} 367. (F.D.) 20.12.31 | ||