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).
Requesting a specific test procedure for a 20 HP Dynamo to generate a representative output curve.
| Identifier | ExFiles\Box 51\1\ Scan171 | |
| Date | 10th July 1923 | |
| X.4383. To FJA. from EFC. {E. Fowler Clarke - Electrical Engineer} EFC {E. Fowler Clarke - Electrical Engineer} 2/T10.7.23. X.4383 - 20 H.P. DYNAMO. We want a really representative output curve of what a machine, as turned out from production, is likely to do in actual service on the car at the temperature it is likely to be under moderate speed touring conditions to be about 85°C. For this purpose I would like you to take machine No.288 and first of all adjust the position of the control brush so that it meets the specification of production and test in a reasonable manner. Next it would be interesting to see the maximum temperature which can be maintained on the machine with this setting on our own bench rig, running on the peak of output with the scheduled voltage. This we expect not to exceed 70°C with an average ambient temperature of 20°C. Having done this, the temperature should be forced up to 85°C by artificial means to imitate the condition in which it would be when attached to the engine, and a new curve of output taken on the scheduled volt-ampere characteristic, the machine being maintained as far as possible at this temperature. This is the curve which we require as a representative curve of output for the machine on the chassis. EFC. {E. Fowler Clarke - Electrical Engineer} Subsequent note. Temp attained on bench rig 75°C with ambient temp. 31°C. EFC. {E. Fowler Clarke - Electrical Engineer} | ||