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).
Motor winding specifications, including turns, resistance, and flux density.
| Identifier | ExFiles\Box 64\1\ scan0135 | |
| Date | 23th May 1923 guessed | |
| -7- Contd. Since ample room is available, it is suggested that 3½ turns of any convenient section larger than the above, consistent with allowing room for the teazer winding (if this is still entertained) be utilised. To the extent that the resistance is reduced by increasing this section above that calculated, the speed of the motor (and engine) will probably be increased over that originally assumed. An alternative would be to increase the number of turns by one, putting up the section at the same time so as to keep the resistance about the same. This, however, would correspond to having taken a larger flux density (7500 lines per cm²) in the first instance (as the ampere turns are now more) and would have corresponded, say, to 66 armature conductors (33 slots) in place of 74. The field resistance already greater than that of the armature would now be still more relatively. | ||