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).
Proposing an experiment to reduce noise from a Lucas dynamo by fitting a rigid metal clamp around its carcase.
Identifier | ExFiles\Box 36\4\ scan 177 | |
Date | 9th December 1920 | |
X.C014-G To Hs{Lord Ernest Hives - Chair}/TMW. from EFC. c. By.{R.W. Bailey - Chief Engineer} c. EP.{G. Eric Platford - Chief Quality Engineer} c. Day c. RH.{R. Hollingworth} c. Wd.{Mr Wood/Mr Whitehead} EFC1/T9.12.20. X.3014b - NOISY LUCAS DYNAMOS. Have we at the present moment a noisy Lucas E.575 dynamo on one of the experimental cars and available for experiment ? If so, I would like this to be fitted round its carcase with some sort of fairly rigid metal clamp hollowed out in two halves to fit the curvature of the outside of the carcase and secured in position by two bolts somewhat as in the accompanying sketch. We have proved on the bench that the noise of the dynamo is due to the vibration of the carcase brought about by the change in magnetic flux as the armature teeth come round, and that this can be materially reduced by damping the possibility of vibration of the carcase by clamping this. We therefore want to see if this will have the same effect on the car. The scheme should be tried not only in one position relatively to the carcase, but if the first position is found ineffective it should be moved round, say, 90° if space permits. Perhaps you would kindly arrange to have this carried out if circumstances allow. EFC. | ||