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).
Calculations regarding the armature slots and windings for a four-pole machine.
| Identifier | ExFiles\Box 38\3\ Scan296 | |
| Date | 10th October 1921 | |
| Contd. -2- R1/G10.10.21 sections fulfil the ordinary conditions of the calculations, the number of slots in the armature for a four-pole machine could be four times x plus 1, this giving the least amount of copper on the armature and the best commutation owing to the windings being in the neutral position i.e. pitch of coil just the minimum less than pitch of poles. R.{Sir Henry Royce} | ||