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 fault, noting a modified control brush plate causing excessive output and recommending a fixed position.
| Identifier | ExFiles\Box 47\4\ Scan225 | |
| Date | 31th December 1925 | |
| Contd. -2- EFC {E. Fowler Clarke - Electrical Engineer} 3/T31.12.25. sufficient heating and a risk of solder going, quite apart from any other fault. N.B. It will be seen that the control brush plate has been filed in order to permit of a still further retarded position than that in which the brush is set at the moment, and there is evidence that the brush has been fixed at some time in this still further retarded position, which would cause the output to be very excessive. It calls attention to the necessity of a fixed control brush position, which we now have on the New PhantomCodename for PHANTOM I dynamo, especially as we have seen recommendations from battery people and others that the outputs on third brush controlled machines generally may be varied to suit requirements by moving the third brush, as if this made no difference to the heating of the generator. The above dynamo is of course an early machine, and we have heard of no similar case of failure of any of the newer machines with the 57 commutator segments. If, therefore, Mr. Elliott has one of these new machines, he should not have any further trouble. We return the dynamo herewith in condition as received. We have not run it. As regards the pitting of the platinum points, this may be the oil vapour trouble, a device to overcome which is in progress of standardisation. EFC. {E. Fowler Clarke - Electrical Engineer} | ||