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).
The investigation of dynamo noise, output, and control brush movement.
| Identifier | WestWitteringFiles\E\July1920\ Scan35 | |
| Date | 27th June 1920 | |
| Contd. -2- EFC5/T27.6.20 The amount of movement of the control brush between normal and "retarded," represented by these curves, corresponds to about 1 1/2 segments. Production are satisfied that the noise of the dynamo is sufficiently eliminated by this means, it having been done on a number of machines, but as they are not satisfied in the question of reduction of output, they are handing us over a machine with the two positions marked and asking us to tell them the exact difference in output and to say if we can pass the out-put with the control brush in the more silent position. Later. We have again tried this on our experimental E.575 dynamo on the bench but do not find the noise to be reduced more than to a slight extent. It has, however, always been the case that the amount EFC. of noise on the bench is no criterion of the amount of noise when the dynamo is fitted in position on the chassis with the undershield. EFC. | ||