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).
Comparing the output of different dynamo models and clarifying the term 'armature reluctance'.
| Identifier | ExFiles\Box 62\3\ scan0315 | |
| Date | 21th December 1932 | |
| X6037 E.{Mr Elliott - Chief Engineer} From Hs{Lord Ernest Hives - Chair}/Wst. c. to By.{R.W. Bailey - Chief Engineer} c. to By/RD. Hs{Lord Ernest Hives - Chair}/Wst.3/MA.21.12.32. DYNAMO TO D.Sch.546. Answering you E.2/HP.20.12.32, the output of the D.Sch.529 (three rate charge dynamo) is 14 amperes as compared with 10.5, for the same temperature rise, on the D.Sch.546 machine. The shunt machine cuts in at 945 R.P.M. and attains its max. charge of 10.5 (for safe heating) at 1165 R.P.M. The expression "armature reluctance" was meant for total reluctance but obviously the greatest contribution to the reduction in armature reaction is the reduction in the number of armature conductors and the increase/the field ampere turns. Hs{Lord Ernest Hives - Chair}/Wst. | ||