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 effects of poor connections and resistance in the dynamo-battery electrical circuit.
| Identifier | WestWitteringFiles\O\2April1926-June1926\ Scan203 | |
| Date | 12th June 1926 | |
| EFCL/T12.6.26. -3- Contd. The development of such poor connections may allow the dynamo terminal voltage and ampere output to rise simultaneously. The dynamo will be subject to a total increase of heating, due to (i) Increased armature current. (ii) Increased voltage on and current through the field winding. at the same time the larger charging current may be bad for the battery, especially if the battery is already fully charged. Secondly, the resistances in the dynamo-battery circuit must, even though sound, be kept down to a minimum, e.g. the internal resistance of the battery (including the true E.M.F. effect, though this is not strictly a resistance in the pure sense of the word) must be kept down as far as possible by the use of the right kind of separation consistent with the provision of the necessary protection of the elements from mutual short circuit. This of course is a difficulty, and a place where a compromise has to be made. The resistances of the connecting wires, particularly those between the distribution box and the battery, and in a lesser degree those leading from the dynamo via the cutout to the distribution box, must be kept within reasonable limits. Though a little extra voltage on the dynamo terminals may not be a serious matter, it is desirable for various reasons to hold the voltage at the distribution box for the purposes of lighting and ignition at a reasonable top limit and this | ||