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).
Unsuccessful experiment to improve the performance of a Standard Lucas E.575 Dynamo.
| Identifier | WestWitteringFiles\H\November1921\ Scan25 | |
| Date | 15th November 1921 | |
| To R.{Sir Henry Royce} from EFC. c. to CJ. c. to E.{Mr Elliott - Chief Engineer} ORIGINAL EFC3/T15.11.21. X.3014b- STANDARD LUCAS E.575 DYNAMO It occurred to us that the performance of the standard Lucas E.575 dynamo might be made more nearly similar to our specified performance by winding the armature with one gauge smaller wire and number of conductors increased proportionally, the idea being to get an earlier cutting in speed though not so big an ampere output at the higher speeds. We therefore had a machine altered in this way, replacing the No.18 S.W.G. D.C.C. (.048") wire with the equivalent of No.19 B.W.G. (.042"). (Actually two wires in parallel to make up the amount). We found the result of this, without altering the control brush position, to be as anticipated, except that the ampere output at high speeds was rather more reduced than we liked. Therefore we advanced the control brush, and put the ampere output up again, but in doing so this caused the cutting in speed to rise again. The final result, therefore, though perhaps a slight improvement over the standard, was not sufficient improvement to be further considered. EFC. K B 3307 (100 L) (2 H 589 10-12-20) C 3214 | ||