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).
Performance analysis of a machine's electrical output at various temperatures and speeds.
| Identifier | WestWitteringFiles\K\June1923\ Scan48 | |
| Date | 12th June 1923 | |
| EFCL/T12.6.23. -3- Contd. (a) Volt-speed Curve from 10 to 17 volts, normally cold. (b) Volt-speed Curve from 10 to 17 volts, normally hot. (c) Ampere output curve starting normally cold with scheduled volt-ampere relation. (d) Ampere output curve normally hot with scheduled volt-ampere relation. (a) At 21°C the machine puts up 10 volts at 450 r.p.m. 12.4 volts at 480 r.p.m. (cold balancing speed) and 17 volts at 535 r.p.m. This rise of voltage with speed is quite rapid as compared with other machines, though the balancing speed is not attained so early as in a number of other machines which we have tested. In particular, the performance in this respect does not equal the post-war Bosch, reported upon in our EFCL/T3.1.23½ (b) At 75°C the machines puts up 10 volts at 535 r.p.m. 13.6 volts at 570 r.p.m. (hot balancing speed) and 17 volts at 605 r.p.m. The same remarks re this performance apply as in the cold case. (c) At 21°C.(N.B. The scheduled volt-ampere characteristic for this case assumes an external circuit resistance of .1 ohm together with an E.M.F. rise of .1 volt per ampere from 12.4 volts). The ampere output of the machine on this characteristic rises to 8 at 616 r.p.m. and 14 at 745 r.p.m. (d) At 75°C. (N.B. The scheduled volt-ampere characteristic for this case assumes an external circuit resistance of .1 ohm together with an E.M.F. rise of .025 volt per ampere from 13.6 volts). The ampere output of the machine on this characteristic rises to 8 at 785 r.p.m. and 14 at 972 r.p.m. Contd. | ||