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).
Difficulties and experiments related to commutator sparking in a dynamo at high speeds.
| Identifier | ExFiles\Box 60\3\ Scan191 | |
| Date | 3rd March 1933 | |
| -2- Hs{Lord Ernest Hives - Chair}/Wst.2/MA.3.3.33. Cont'd.{John DeLooze - Company Secretary} Our main difficulty which has taken us some considerable time to surmount has been to reduce the commutator sparking at high speeds with full output (as distinct from the usual approx. 4% drop in output experienced with the third brush dynamo at high speeds) to within reasonable limits. We have made some headway in this direction with both dynamos without sacrificing much in the way of cutting in speed and maximum output. There are a number of experiments we are trying out in this direction one of the most interesting being the inclusion of a few series turns on the main field. Hs{Lord Ernest Hives - Chair}/Wst. | ||