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).
Page of calculations for an electric motor, detailing flux, conductors, and back E.M.F.
| Identifier | ExFiles\Box 64\1\ scan0118 | |
| Date | 30th April 1923 guessed | |
| -2- Contd. Length = 2.75" = 69.9 mm. Useful flux per pole = 5600 x 6.99 x 4.27 = 167000 lines. Number of conductors = Tb x 10^8 / 1.41 P Ø C = 36.4 x 2 x 10^8 / 1.41 x 4 x 167000 x 108 = 71.6 No. of conductors to be adopted = 74 No. of slots or sections = 37 Back E.M.F. when rolling engine = Ø Z N P / 60 x 10^8 x b = 167000 x 74 x 1760 x 4 / 60 x 10^8 x 2 = 7.25 Forward E.M.F. = .84 E.M.F. for resistance = 2.59 Amperes 108 Total motor ohms = .024 Contd. | ||