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).
Completely externally regulated dynamo systems and their role in the ideal chassis electrical system.
| Identifier | WestWitteringFiles\O\2April1926-June1926\ Scan205 | |
| Date | 26th June 1925 | |
| EFC1/T12.6.625. -5- Contd. COMPLETELY EXTERNALLY REGULATED DYNAMO SYSTEMS. The ideal chassis electrical system insofar as the dynamo-battery combination is concerned is one in which that combination is capable of adjusting itself to the ampere load demand from time to time with only the relatively small change of operating voltage necessary to bring about effective adjustment. At periods of abnormally heavy demand, other than engine starting periods, both dynamo and battery will be supplying current and on a subsequent period of light demand the dynamo will be replacing charge in the battery. It is clear, therefore, that there is a condition in which the battery can be disconnected and stability of voltage of supply still ensured, at any rate in so far as the tendency to undue rise of voltage is concerned. In an ordinary shunt wound dynamo running at constant speed, operating voltage regulation can be carried out by hand by regulating through the medium of variable series resistance the excitation current of the machine, and within considerably wide limits this would still be possible with variations of speed taking place. It is not necessary or desirable, however, to think of the requirements of a chassis system as being constant voltage, but constancy of a combined function of voltage and current, in which function however the voltage is predominant. For instance, in a lighting station it might be necessary to effect control in such a manner that the voltage at the station rose so much for each ampere of current demanded, in order that it Contd. | ||