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 difficulties and compromises of designing reliable automatic field current regulation systems for battery charging.
| Identifier | WestWitteringFiles\O\2April1926-June1926\ Scan208 | |
| Date | 12th June 1926 | |
| EFCL/T12.6.26. -8- Contd. It is clear that if this function is controlled to this value the battery(in the absence of other load) must receive a tapering charge, only receiving 4 amperes when its terminal voltage is something less than 16, say about 15½, which would probably be a suitable charging rate, further that the extremes of battery terminal P.D. would not be so great as in the ordinary system. Such a system properly arranged electrically with a plain shunt wound dynamo is practically ideal in principle as regards effecting supply of current in accordance with the demand, but unfortunately there are practical difficulties in small systems in the consistent regulation of the flow of field current, though there does exist one system which, from the regulation point of view, is practically the ideal, and we have little doubt that a reliable system of such a type is possible if correctly designed. Owing to the difficulty of getting such systems to work reliably and consistently it is not surprising that there have been proposed and carried out a number of compromises which are intermediate between the straight-forward so-called inherently controlled systems described earlier, and the ideal system of automatic field current regulation referred to above. Contd. | ||