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).
The problem of reducing charging current using a vibrator regulator and the effects of resistance R.
| Identifier | WestWitteringFiles\R\2October1927-November-1927\ 52 | |
| Date | 8th June 1927 guessed | |
| -11- is to be preferred. The further problem, therefore is that of getting a big reduction in the charging current without the auto switch becoming a vibrator regulator, towards which there is a big tendency with a high value of R.{Sir Henry Royce} But it does not appear to us that there is any essential difference between getting a very small charging current, and switching off the charge altogether (infinite value of R, or breaking the field entirely). In both cases the problem is largely the avoidance of vibrator regulator action. Practically the difference between the two cases may be said to be that the value of R in one of the two cases is so great as to put the cutting in point of the dynamo entirely outside the range of possible speed. It is to be noted that if some means can be found which enable us to increase the value of R.{Sir Henry Royce} without running into vibrator regulator action, we should, had the negative end connection of the shunt coil of the auto switch unit been left on the original side of the cutout, run into the low frequency vibration trouble referred to in the Note on p.8. The fact of having moved this connection to the earthed side of the cutout (as shown on diagram) will prevent the occurrence of this phenomenon when the resistance R has become so large as otherwise to produce it. That, therefore, is an additional reason for the change in the method of connection which we have adopted, and appears fully to justify our putting up with the loss of protection referred to in p.9. Having arrived at this point, the only thing to discover is | ||