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 design and testing of the switchbox, auto switch, and battery charging system.
| Identifier | WestWitteringFiles\Q\2April1927-June1927\ 163 | |
| Date | 3rd June 1927 | |
| EFCl/T3.6.27. -3- Contd. to the first position, but we are of the opinion that that is not desirable, one reason being that if we want to test the efficacy of thebattery ignition it would be an advantage not to have the extra voltage due to charge. We are therefore of the definite opinion that in view of future possibilities, the present arrangement of the switchbox is the best. Another reason is that it will still provide the means of switching off the charge altogether in one of the running positions in case of emergency in respect of the dynamo, without the necessity of removing the central exciting wire which has to be done when the battery cannot be used. The position in respect of the auto switch is that R.{Sir Henry Royce} has asked for a larger reduction in the charge than we had originally arranged for in the use of a standard ballast resistance as the resistance unit. We agree as to the advantage of going further than we have already done in reducing the rate of charge. At the same time it will probably be found an advantage to increase the voltage figure at which the charging switch operates, so that there will be no doubt as to the battery receiving a good full charge before the reduced rate of charge comes into play, then when it does operate it will be such a small charge as only to be considered a trickle charge. Experimental work in this direction is proceeding on these lines - in the first instance we are doubling the amount of resistance inserted into thefield winding. Contd. | ||