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 and battery charging characteristics for the Phantom car.
| Identifier | ExFiles\Box 164\3\ img107 | |
| Date | 7th January 1938 guessed | |
| -4- This however is bound up with the design of the L.R.7 regulator at present being developed. As regards the dynamo the small machine is better able to cope with a high output than the larger one, owing to the fact that the former has a smaller number of conductors per slot. For this reason we are pushing on with the idea of fitting a small dynamo on the Phantom car; although the later cutting-in of this machine may prove a draw-back. There is of course in reserve the latest type of dynamo having 72 coils and improved brush gear. The method suggested in (c) is important not only in connection with the present question of charging but also from the point of view of starting. For this reason we are constructing a high rate discharge rig with which to investigate battery characteristics. Summary. After considering the facts of the case together with available evidence and the results of tests, we conclude that generally the battery would benefit from a higher rate of charge. That this can best be obtained immediately by the use of a regulator with a higher output characteristic and later with possibly the divided series winding, but this in turn will increase the load on the dynamo which may prove troublesome. For this we have as a last resort a special machine. Finally some advantage may be gained from reducing the battery internal resistance, this is to be considered. Rm{William Robotham - Chief Engineer}/RC.{R. Childs} | ||