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).
Development of higher output dynamos and the associated risk of battery overcharging.
| Identifier | ExFiles\Box 68\4\ scan0132 | |
| Date | 30th January 1929 | |
| W/S. To PN.{Mr Northey} from EFC. c. SG.{Arthur F. Sidgreaves - MD} Cx.{Major Len W. Cox - Advertising Manager} c. CWB. Wor.{Arthur Wormald - General Works Manager} X8664 EFC3/T30.1.29. DYNAMO OUTPUT. The position in respect of dynamos is that we have developed and adapted for clients' requirements in special cases higher output machines of both 20 H.P. and Phantom size. The outputs of these machines in comparison with standard outputs are shown on the accompanying curves. These special dynamos can be supplied when required. It would not be suitable to supply these universally for two reasons - (1) There is some loss of charge in the early stages. (2) The high rate of charge is undesirable for the battery. This might partly be counteracted by the use of a green lamp indicator telling the driver to switch off the charge. In our EFC1/T4.10.28 we informed you of the increase of weight necessary to enable us to get both early cutting-in and higher output in the same machine. Whereas batteries are now in such an improved condition that they are reasonably robust when continuously charged by machines of normal rate, they would be subject to considerable deterioration if continuously charged at the rate of output given by these higher output machines. The only really satisfactory solution is in our opinion the development of some means of automatic control so that higher output machines could be used without the danger of overcharging. With a reliable means of automatic control, it would be possible to have a dynamo which will | ||