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).
Dynamo charging current issues and potential armature modifications.
| Identifier | WestWitteringFiles\T\January1929-February1929\ Scan067 | |
| Date | 27th January 1929 | |
| EFC. HS.{Lord Ernest Hives - Chair} } E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} } FROM R.{Sir Henry Royce} (At Le CanadelHenry Royce's French residence) SECRET. R3/M27.1.29. REC'D AT WW. 30.1.29. c.c. to SG.{Arthur F. Sidgreaves - MD} WOR.{Arthur Wormald - General Works Manager} PN.{Mr Northey} CWB. SS.{S. Smith} ON G.4. ELECTRICAL EQUIPMENT. x.7660 x 8664 x5653 DYNAMOS. It is understood that the only trouble with these is that the charging current at high speed drops too much. Should we require a larger current always it seems only necessary to adopt a slightly higher engine speed for cutting in. - It being realised that heat of dynamo makes the current limit so that we must wind with larger diameter wire on the armature, and fewer turns. This is permissible because the top gear ratio is lower than when our present standard was fixed, and also cars have so improved that their speed even in towns is higher. It will be remembered that we now have two armatures and that we might make our standard the one that gives the larger amount. R.{Sir Henry Royce} | ||