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).
The principles of voltage and current regulation using an external regulator in a dynamo-based electrical system.
| Identifier | ExFiles\Box 31\1\ Scan190 | |
| Date | 12th June 1926 | |
| EPC./T12.6.26. -6- Contd. in such a manner that the voltage at the station rose so much for each ampere of current demanded, in order that it should remain constant on the mains, and in the present case, for reasons in connection with the battery, which will not here be given in detail, the reverse would be the case, namely that it would be more expedient to allow the voltage of the system (say, at the distribution box) to fall so much per ampere of current delivered by the dynamo. What is ideally required then is an external regulator or automatic intelligence which controls the amount of field or exciting current of the generator in such a way as to maintain constant some chosen combined function of the voltage of the system and the ampere output of the dynamo. The point we wish to emphasize is that in the case of such a regulator, being electro-magnetically operated, we need not necessarily consider it as a voltage controller because it can just as readily be a current controller or a controller of any combined function of voltage and current output which we like to make it. In the actual case, however, since we want all the advantages available with such a system, and in particular that of being able to run with the battery disconnected, it would be necessary to make this function contain voltage principally, and only to be affected in a lesser degree by the current sufficiently to prevent too great a load on the dynamo at the time of big demand, or when, with little demand, the battery is unusually low in E.M.F. Contd. | ||