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).
Instructions for an experiment on a 24 slot armature concerning air-gap and field winding adjustments.
| Identifier | ExFiles\Box 165\6\ img226 | |
| Date | 8th December 1924 | |
| RR 259 (150 BKS.) (DB{Donald Bastow - Suspensions} 461-8-12-24) MP 306975 ROLLS-ROYCE LTD. INSTRUCTIONS. 19 To Order No. Customer's No. 3 due to the 24 slot armature A wider air-gap would increase the high speed output - but would make the cutting-in and peak speeds higher. It might be possible to get a better result by using a finer gauge field winding (and therefore a larger control brush span electrically) involving possibly less sacrifice of cutting-in speed and giving a flatter peak and larger high-speed output. This experiment would be simpler than grinding out the pole faces for a larger air-gap and we suggest it should be tried first. A combination of the two cures may eventually be necessary. This note is to summarise the position to date before giving full details of the results. Signed F.H.A. This Sheet must be filed on completion of the work. | ||