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).
Description of the function of different coils within a cutout, auxiliary relay, and regulator system.
| Identifier | WestWitteringFiles\K\June1923\ Scan50 | |
| Date | 12th June 1923 | |
| Contd. -5- EFC1/T12.6.23. system. On the cutout there are the usual series and shunt coils, on the auxiliary relay there is a shunt or volt-operated coil only, but on the regulator there are as many as four different coils, each serving a definite purpose - these are as follows (as in order down the diagram):- (a) The main series coil. (b) A coil virtually in parallel with the dynamo field winding, which appears to have very little magnetic effect, therefore acts mainly as a resistance. (c) The auxiliary series coil through which the load current (other than battery load) is diverted when the auxiliary relay is operated. This coil acts in a reverse direction to the main series coil and appears to have the same number of turns, so that with battery disconnected and speed fast enough for the auxiliary relay to have been operated, the load current would have no effect on the regulation, but only the voltage of the system. (d) In these circumstances (d), which is a volt operated coil, is in operation, and voltage control is the result. Supposing the voltage has not risen high enough to operate the auxiliary relay, the coil (c) is short circuited by the auxiliary relay switch contacts, and we assume it is intended that no current passes through this coil, in which case there is virtually only the main current coil in operation and constant current control exists. In these circumstances there is no differentiation between battery load and lighting load, as the differentiation only occurs after the auxiliary relay has operated. When neither cutout nor auxiliary relay are operated, the battery is in direct connection with the lighting load and coil (c). Contd. | ||