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 report page discussing voltage regulation performance and comparing it with Bosch, Bijur, and Tirrill systems.
| Identifier | WestWitteringFiles\K\June1923\ Scan53 | |
| Date | 12th June 1923 | |
| Contd. -8- In addition to this the difference of operating voltage between hot and cold volt-speed curves is also about twice as much as occu on the old R.{Sir Henry Royce} Bosch. It will be noted that the end of the voltage regulating range occurs about 4600 r.p.m. This is the top limit to the control. The field current curves call for no special remark. As regards the initiation of regulation by contact vibration, the regulator does not require, as in the case of the Bijur and Bosch, more ampere turns to start than to run, so that once in operation, (i.e. due to operation of auxiliary relay), there is no small kink in the open circuit volt-speed curve at the beginning of operation, as in these other cases. Themake and break appears to occur at a lower frequency than in the Bijur case, more like that of the Tirrill regulator for central station work. As regards actual operating conditions, it appears that if we can assume the out contacts of the auxiliary relay switch to be of zero resistance till actually coming off, the regulator action would hold the current given by the dynamo constant irrespective of variations in the load current, so that the battery would receive or make up exactly the difference, as the case may be. This is one extreme condition. The other extreme condition we may suppose is that the out contacts of the auxiliary relay are thoroughly bad, so that all the load current passes through the auxiliary series coil, in which case the difference of dynamo current and Contd. | ||