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).
Test results for a regulator, detailing resistance values and output currents under various conditions.
| Identifier | ExFiles\Box 166\2\ img135 | |
| Date | 26th November 1937 | |
| -2- 26th. November 1937. (yoke temperature 70°C) condition. This was found to be:- Cold - 105.4 w. Hot - 117 w. (b) What value of resistance was necessary to limit the output of the machine when on load to 5 amperes and 15 volts, up to a speed of 6,500 r.p.m. This was found to be:- Cold - 54.8 w. Hot - 61.2 w. (c) The value of resistance necessary to limit the output to 15 amperes at 13 volts up to 6,500 r.p.m. This was found to be:- Cold - 10.5 w. Hot - 10.7 w. In view of the fact that with the LR.{Mr Ellor}7 regulator we should not have an armature fuse we need not further consider the O.C. condition. Hence, our most extreme condition would be in the neighbourhood of (b); i.e. under summer day-running conditions when the battery is more or less fully charged, and the dynamo load is only about 5 amperes. Under these conditions your points resistance of 65 ohms appears to be about right. (2) It was pointed out that in some cases the regulated output at 13 volts was below our specified minimum of 14.0 amperes. One particular regulator, No. ENS.1202-1, was quoted which in order to be quite sure we offered to re-test. We now give the results of this re-test together with those of the original test. Regulator No. ENS.1202-1. Output Current at 13 volts. (A.1) Cold. First test 11.2 amperes. Cutout operated at 12.15 volts. Re-test 12.0 " " " " 12.15 volts. Hot. First test 17.4 amperes. Cutout operated at 17.0 volts. Re-test 17.0 " " " " 16.8 " | ||