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).
Tests and modifications on a dynamo with series winding.
| Identifier | WestWitteringFiles\W\May1931-August1931\ Scan057 | |
| Date | 15th June 1931 | |
| ORIGINAL. To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/Pgt. c. Sg.{Arthur F. Sidgreaves - MD} c. Wor.{Arthur Wormald - General Works Manager} E.{Mr Elliott - Chief Engineer} c. Da.{Bernard Day - Chassis Design} By.{R.W. Bailey - Chief Engineer} PN.{Mr Northey} Hs{Lord Ernest Hives - Chair}/Pgt1/AD15.6.31. DYNAMO WITH SERIES WINDING. X6099 With reference to your R1/M4.6.31, we have now carried out tests on the lines indicated in the above memo and attach a set of curves (sheet 1) showing the results. As will be seen, correcting the peak by inserting resistance in the field circuit does maintain the output better at high speeds, but makes the cutting in point later. Referring to the first paragraph of the above memo, we had already made a test with the series winding acting in opposition to the main, previous to that memo, therefore, as a matter of interest we also send you a second set of curves (sheet 2) showing the effect of this. Here again, the curve tends to become more level, but it is at the expense of output in the early stages of the curve. Replying to PN{Mr Northey}1/WT5.6.31, exciting the series winding by means of the headlamp current would certainly result in an increase in output over the whole curve. We believe, however, it is generally understood (see R3/M19.5.31) that the complication of this method is undesirable involving, as it does, extra terminals on the dynamo carcase and distribution box and also extra cables. Hs{Lord Ernest Hives - Chair}/C. A.{Mr Adams} Pignatt. Curves attached. | ||