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).
Finding a solution for noisy dynamos by experimenting with a new armature design.
| Identifier | ExFiles\Box 165\6\ img126 | |
| Date | 22th March 1927 guessed | |
| -2- Contd. With regard to your last para. and again as in the 40/50 case, I am afraid we have got to admit that we cannot find a palliative which can be used on present dynamos which are noisy to make them silent. We have, however, as you know, an armature with a different number of slots which so far as it has been experimented with at present gives hope of being a fundamental cure, when run in an otherwise standard machine, and as we have one such armature running on the present 20 HP. 10,000 mile test car, there is some hope of being able to standardise this armature in the comparatively near future. We would like to make the suggestion that you should have a number of such armatures put in hand on the strength of the probability that they will become standard. We might then even use some of these in some of the bad cases before they are properly standardised. There is no external apparent difference in the armature and so far as we can see there does not appear to be any reason why such an armature should not be equally satisfactory from other points of view, and good reason that it should be better from the noise point of view. This of course refers to the 20 HP machine. Do you think that course might be entertained ? We are of course awaiting one or two of these armatures experimentally, but unfortunately they are not yet to hand, one reason being that the expl. shop has been very busy on other matters which have been considered of more importance, though apparently this question of dynamo noise is of considerable importance. EFC, | ||