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 dynamo, its control mechanism, and wiring specifications.
| Identifier | ExFiles\Box 26\2\ Scan116 | |
| Date | 27th February 1920 guessed | |
| Contd. -2- dash at E (fig. 59) and at the contact breaker under the battery ignition distributor. DYNAMO. This is situated on the off-side of the gear box and driven by a Whittle belt. It is of a type which, when connected to a battery, is so controlled as to cause it to generate a nearly constant current for wide variations of speed. Such control is effected by the addition to what is otherwise practically a plain shunt wound dynamo of a control brush, nearly mid-way between the main brushes, and a control winding on the field pole through which current from the control brush passes to a main brush. The arrangement involves the use of a four lead cable between the dynamo and the switchbox. The actual leads are coloured as follows :- Lead. Colour. Corresponding. number on dynamo. Positive Red. 1. Field. Black. 2. Control. Green. 3. Negative. White. 4. NOTE:- On some cars the colours will be found to be as follows:- Positive red, Field green, Control yellow, and Negative black, owing to the use of cable of different manufacture. An adjustment for the tension of the dynamo driving belt is provided at A.{Mr Adams} (fig. 56). Contd. | ||