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).
Continued description and criticism of an electrical system's operation, referencing volt-speed curves.
| Identifier | WestWitteringFiles\K\June1923\ Scan51 | |
| Date | 12th June 1923 | |
| Contd. -6- EFC1/T12.6.23. which is also connected, is then entirely insulated from the dynamo, (apart from the common earth return). There is a resistance of 59 ohms across the contacts operated by the regulator core. The material of the contact surfaces appears to be carbon so far as can be seen. One criticism of the system that occurred to us before actual trial, and which has been confirmed by trial, is that whilst the pressure on the out contacts of the auxiliary relay switch is being reduced, due to a rise of voltage of the system, the load current would be diverted from these contacts round the auxiliary series coil (c), and in so doing, would interfere with the current regulation and cause regulation temporarily to take place at a higher current. This, however, is partly off-set by the fact that the higher current would give rise to a higher system voltage and cause the auxiliary relay to be operated more quickly than would otherwise be the case, so that the effect is not as bad as it at first sight might appear. On such a system, the only definite curves of operation which can be taken are the open circuit volt-speed curves, first in the cold and secondly in the hot condition. As regards the actual performance in operating conditions, we can only form an estimate of this by watching the system under different conditions of battery and lighting load. Accordingly the above referred to volt-speed curves have been taken, and are exhibited on the photostat curves herewith. At the same time .. dynamo field | ||