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).
Specification sheet detailing the principal quantities and calculations for an electrical component.
| Identifier | ExFiles\Box 72\4\ scan0005 | |
| Date | 26th April 1926 guessed | |
| -5- Contd. Principal Quantities. No. of armature conductors = 464 Armature resis. at 100°C = .384 ohm. Field resistance at 80°C = 3.04 ohms. Cutting in point. = 13.6 volts. Field turns = 133 Field amperes = 4.47 (at cut-in) " ampere-turns = 595 Useful flux produced by these ampere turns. = 240,000 (say) Armature E.M.F. = 13.6 + 1.8 = 15.4 Hot cutting-in speed as shunt machine = N = (60 x 10⁸ x b x E) / (Ø Z P) = (60 x 10⁸ x 2 x 15.4) / (240,000 x 464 x 4) = 415. EFC. | ||