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).
Letter discussing the procedure for checking a new regulator type RR1 used with a 5' dynamo.
| Identifier | ExFiles\Box 166\2\ img230 | |
| Date | 21th December 1938 | |
| COPY TO MR. R.M. CHILDS, R-R.{Sir Henry Royce} 6092 R.E. Davis, Esq., Messrs. Rolls Royce Ltd., DERBY. CER/W. 21st December, 1938. Dear Sirs, As arranged during the visit of the writer on Monday, the 19th, the procedure to be adopted for checking the proposed new regulator type RR1 to be used in conjunction with the Rolls Royce 5" dynamo has been the subject of an investigation. As mentioned at the time of the visit, the open circuit voltage of the regulator unit rises with increasing speed and similarly when on load the output current also rises. Moreover, there is a slight difference obtained on the output values from the regulator, depending upon the type of dynamo actually used. Whilst in the Electrical Laboratory at Derby it was observed that there was a difficulty in obtaining the necessary output from the driving motor if the speed of the dynamo under test was limited to the vicinity of 2,000 r.p.m., and it was arranged to check the load characteristic of the dynamo and regulator at approximately 4000 dynamo r.p.m. This means that the values obtained both for open circuit voltage and load characteristics will be higher in the Rolls Royce Laboratory than those obtained in the Lucas Laboratory, and in order that as far as possible agreement shall be obtained between the two testing departments, it is desirable that as far as possible a common basis should be employed. When the writer was at Derby it was suggested | ||