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).
Dynamo regulation and trickle charge performance under various conditions.
| Identifier | WestWitteringFiles\K\September1923\ Scan34 | |
| Date | 1st September 1923 | |
| Contd. -2- (1) The cold (18°C) open circuit regulation now starts at 14.6 volts at 490 r.p.m. and varies fairly steadily from this up to 14.9 volts as the speed is increased up to 4000 r.p.m. In the hot condition (75°C) regulation now commences at 15.85 volts at 550 r.p.m. and varies between 15.75 and 16.0 volts up to 4000 r.p.m., above which speed it becomes unsteady and wavers between 15.6 and 16.2 volts. These characteristics are very much the same as previously, but the point of transition from the low mode to the higher speed mode of regulation is not now so definitely discernable. (2) Operating on a 7 ampere load (without battery) regulation commences at 14.85 volts at 670 r.p.m., goes to 15.1 at 1600 r.p.m., and varies between these amounts up to 4000 r.p.m.. In a similar test but with 13.0 amperes load, regulation started at 14.35 volts at 920 r.p.m. and tended to fall with increase of speed down to 13.9 volts at 3200 r.p.m. The dynamo temperature in each of these cases was between 63° and 66°C. These figures for the voltages and load are greater than were previously observed. (3) Trickle Charge. To a fully charged chassis battery (E.M.F. 13.6 volts) the dynamo, when at 70°C, delivered from 5 to 6 amperes. With the dynamo in a cold condition this was reduced to 2 amperes. Previously the trickle was only 2 amperes in the hot condition, and it is considered that | ||