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).
Managing resistance in the dynamo-battery circuit and maintaining battery health.
| Identifier | ExFiles\Box 61\2\ scan0243 | |
| Date | 14th September 1926 | |
| Contd. -3- EFC5/T14.9.26. Secondly, the resistances in the dynamo-battery circuit must, even though sound, be kept down to a minimum. For instance, in the design of the battery its internal resistance (including its true E.M.F. effect though this is not strictly a resistance in the pure sense of the word) must be kept down as far as possible by the use of the right kind of separation consistent with the provision of the necessary protection of the elements from mutual short circuit. Also in the arrangement of the system the resistances of the connecting wires, particularly those between the distribution box and the battery, must be kept within reasonable limits. Again, the internal resistance of the battery must be kept down to normal by the maintenance of the proper level of electrolyte - in any case this is of first importance also from other points of view, because negative battery plates must never be exposed to oxidising influences for any length of time. Though a little extra voltage on the dynamo terminals may not be a serious matter, it is desirable for various reasons to hold the voltage at the distribution box for the purposes of lighting and ignition at a reasonable top limit and this will depend, amongst other things, on the internal resistance of the battery and on the group of connecting wires mentioned, remembering always that there is a tendency for the volts and ampere output of the dynamo to the battery to rise on the least provocation, and that every care must be taken to minimise the possibility of such an occurrence. Contd. | ||