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).
Proposed modifications to the Phantom II starter motor for improved power and speed.
| Identifier | ExFiles\Box 62\1\ scan0091 | |
| Date | 6th November 1932 | |
| X6079 To By.{R.W. Bailey - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/Wst. c. E.{Mr Elliott - Chief Engineer} c. Wor.{Arthur Wormald - General Works Manager} c. BY/RD. Hs{Lord Ernest Hives - Chair}/Wst. 3/AM 6.11.32. PHANTOM II STARTER MOTOR With reference to our Hs{Lord Ernest Hives - Chair}/Wst.8/KT18.8.32 in which we referred to the necessity for an improvement in the power and speed of the Phantom starter motor with the new carburetter, we have been investigating the design possibilities on the basis of a higher motor speed and we should like instructing for experimental test a motor having the following modifications :- (a) A new armature having 29 slots with one coil per slot and one turn per coil of copper bar as per D.71937 but with the thickness increased from .062" to .070". (b) A new field winding consisting of bar of section .135" x .156". (c) A new set of magnet poles, made up of Lohys stampings, of reduced section .850" wide by 3.250" long. We anticipate that these modifications will give us a larger B.H.P. taking about 25% more current from the battery. The existing motor is quite reasonably cool even after a run, under normal load conditions, of 5 mins. duration. Hs{Lord Ernest Hives - Chair}/Wst. | ||