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).
Advantages and disadvantages of two different schemes for a dynamo-battery system's manual charge switch.
| Identifier | ExFiles\Box 62\3\ scan0009 | |
| Date | 1st January 1930 | |
| To R.{Sir Henry Royce} from EFC. c. Sg.{Arthur F. Sidgreaves - MD} c. Wor.{Arthur Wormald - General Works Manager} FN. c. Dy.{F R Danby} Z. X5661 EFCA/AD2.1.30. X.8780. PERFORMANCE OF DYNAMO-BATTERY SYSTEM. X5661 The manual full and half charge switch, now again under consideration as a result of experiences on cars of other makers, can be arranged either as an independent charge reducing switch inserting resistance in the field winding circuit or as a switch interconnected with the headlamp switch. The former case involves less complication of the present system than the latter. There are other apparent advantages and disadvantages of the two schemes. If, for instance, the switch is interconnected with the head lamps, it would be possible to set the generator to a higher output with the same degree of safety than if it were independent. A disadvantage of a high dynamo output subject only to manual reduction either by inserting resistance or as referred to below, is that the output is very sensitive to exact control brush position and bedding at the high output end, and so might be appreciably greater at one time than another. The suggestion of using two control brushes relatively staggered with a two way switch for altering the output of the dynamo is attractive. The rate of change of output with control brush position is great from moderate to high outputs so that unless the minor output were to be | ||