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).
Request for investigation and test data on the end pull of a starter motor armature.
| Identifier | WestWitteringFiles\P\July1926-September1926\ Scan117 | |
| Date | 23th September 1926 guessed | |
| (2) Before committing ourselves too far with the design of this unit there are a few points we should like you to investigate and test: they are - (A) What is the end pull of the existing starter motor armature by teazer circuit magnetisation from one inch out to normal position, when the pull fails to nothing. We believe the curve for end pull is somewhat like this, and we should like you to give us the correct characteristic for this with the intermediate positions Diagram Labels: LBS PULL DISTANCE OUT OF ARMATURE 4" 3" 2" 1" 0 We should further be glad if you would give us the pull in terms of ampere turns for various positions between one inch out and normal. (B) What is the end pull of the armature by the main circuit field winding for positions say from half inch out to normal? We require this information as soon as you can possibly let us have it in order to determine the most efficient layout and spring loads etc. R.{Sir Henry Royce} | ||