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).
Analysis of voltage regulation and performance curves for a 12-volt dynamo and battery system.
| Identifier | WestWitteringFiles\F\February1921\ Scan71 | |
| Date | 2nd February 1921 | |
| Contd. -4- to the main field. These curves are given on the accompanying photostat sheet and correspond to the same setting, a setting in the correct neighbourhood for operating a 12 volt battery, but it will be readily understood that the correct setting in the two different cases for a 12 volt battery would differ slightly. It will be seen from these curves that when the coil is omitted the regulated open circuit voltage is nearly constant. There is still a slight rise which may be partly due to the fact that in the open circuit case of this Westinghouse regulator, the field current has still to pass through the main series compounding coil before reaching the field winding, which coil however is of many fewer turns than, and less than one tenth of, the resistance of the regulator field current coil. It may, however, in part be due to other causes as, as it may be remembered, a rise of voltage with speed occurred in the case of the Bijur system with the regulator entirely volt coil operated. On the other hand, with the coil left in circuit, the voltage rises considerably with speed within the regulating range ( its average being lower due to the magnetising effect of this coil). As would be expected, with the dynamo and regulator suitably set and connected to charge a battery in a given condition (e.g. fully charged) the amperes delivered rise considerably with rise of speed with the field current coil in circuit. For instance, we found the current to rise Contd. | ||