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).
Investigation into silencing noisy Lucas E.575 dynamos.
| Identifier | WestWitteringFiles\E\July1920\ Scan34 | |
| Date | 27th August 1920 | |
| To R.{Sir Henry Royce} from EFC c. to CJ. c. to Wor.{Arthur Wormald - General Works Manager} c. to E.{Mr Elliott - Chief Engineer} c. to Da.{Bernard Day - Chassis Design} c. to Hs.{Lord Ernest Hives - Chair} c. to Bn.{W.O. Bentley / Mr Barrington} c. to PN.{Mr Northey} c. to By c. to Wd.{Mr Wood/Mr Whitehead} ORIGINAL. X.3014 - LUCAS E.575 DYNAMO SILENCE. Further to our EFC2/T23.7.20, owing to the number of noisy E.575 dynamos lately received from Messrs. Lucas, a visit of their Mr. Ireland to Derby was arranged. We were not able to be present whilst Mr. Ireland was here, but during his visit we understand he demonstrated that the noise of the machines at the particular speed at which noise was undesirable could be practically eliminated by moving the control brush backwards (against rotation) to the extent of one commutator segment. (No. of commutator segments = 30). We had previously experimented on these lines and had found a similar, but not quite so marked, result. We must found that the speed at which the magnetic hum was most predominant was slightly altered and possibly the maximum noise somewhat reduced. We had also shown that the out-put of the dynamo was reduced by this movement, (see curves under cover of our EFC7/T18.6.20, from which it will be seen that the cutting in speed is scarcely affected, but that the output is decreased in the retarded position. Contd. | ||