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).
Performance characteristics of car dynamos and suggesting improvements.
| Identifier | ExFiles\Box 163\6\ img099 | |
| Date | 13th December 1930 | |
| EFC.) FROM R.{Sir Henry Royce} HS.{Lord Ernest Hives - Chair}) C. to SG.{Arthur F. Sidgreaves - MD} WOR.{Arthur Wormald - General Works Manager} BY.{R.W. Bailey - Chief Engineer} X.6005 CAR DYNAMOS. X6016. X.6006 X6016 R1/M13.12.30. [STAMP: RECEIVED 15 DEC 1930] We must always cut in at 15 MPH. We must have current enough to maintain all the running demands at all speeds above 25 MPH. I think it wrong to have such a definite falling characteristic because the high speed man has the most powerful lamps, and he must maintain his lighting up to 60 MPH. I think the 3rd. brush position can be improved - i.e. if it is 'minus' it should be nearer the main 'minus' to maintain the characteristic. It only seems important to reduce the current if this is too heavy for the battery when no lighting is used. With reduced current we must not cut in late, therefore the resistance should not be in the field. I suggest the increase of current might be obtained by making the headlamp a series winding R.{Sir Henry Royce} | ||