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).
Dynamo drive belt slipping and noise issues from E.575 dynamos.
| Identifier | Morton\M3.7\ img010 | |
| Date | 1st August 1919 | |
| To R.{Sir Henry Royce} from EFC. c. to BJ. c. to Bn.{W.O. Bentley / Mr Barrington} c. to Wor.{Arthur Wormald - General Works Manager} c. to EH. ORIGINAL. EFC2/T1.8.19. RE DYNAMO AND DYNAMO DRIVE X.294. X.3014. Regarding Mr. Barrington's report Bn{W.O. Bentley / Mr Barrington}5/W28.7.19, pp.3 last par., upon examination of the dynamo drive after the holiday, it was found that the driving belt was rather on the slack side. We would like to explain that it was under this condition that we were able to cause the belt to slip and to remain slipping under normal conditions by momentarily putting an over-load on the dynamo. After taking up the belt slack with the adjustment, and putting it possibly rather on the tight side, we did not notice any appreciable belt slip, even when we did over-load the dynamo as a plain shunt machine, by removing the fuse in the control circuit. We do not think that, with a reasonable tension on the belt, and the dynamo running under normal conditions, there is going to be any appreciable slipping with a speed ratio of 1.7 : 1. Referring to pp.4 bottom paragraph regarding the noise produced by the dynamo, we have had three E.575 dynamos under experimental observation, two of these produced a hum at speeds higher than, but in the neighbourhood of, the cutting in speed. The third one was brought to us by one of Messrs. Lucas' representatives as being a particularly quiet machine, and is now being put on chassis 1 EX in place of one of the two noisy ones which has just been removed. All these three machines have parallel slots and parallel pole edges. Contd. | ||