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).
Experiments to optimise a machine's output, focusing on field winding and control brush positioning, and comparing it to a Bosch dynamo.
Identifier | WestWitteringFiles\J\January1923\ Scan33 | |
Date | 23th January 1923 | |
To P & E.{Mr Elliott - Chief Engineer} from EFC. -2- EFC2/T23.1.23. Contd. ******************************************************************************** experiment on otherwize the same machine. By consideration of the two extreme conditions it appears there must be an optimum size of wire for the field winding to give the best result and it is now doubtful whether this optimum has been exactly secured, hence the further experiment. As regards the exact location of the control brush we had arranged this in the first instance in a rather safe position from the point of view of heating, nevertheless in a position such as to give the required specified output. Of late, however, complaints have been received that the output is sometimes not sufficient on production cars. (It is possible for the output to vary a bit with the exact bedding of the control brush and it may in some cases have actually fallen below the specification in spite of having been up to this during production test). To overcome these complaints we have increased the minimum peak output given on the production specification of test, now knowing from experiments we have made in the meantime on experimental cars that we are safe in allowing the dynamo to give this increased output still with insignificant danger of overheating. It has already been pointed out that this U.S.A. Bosch dynamo is, although not of the same finish, more similar in electrical quantities and performance to our own Goshawk machine, than any of the other machines submitted, and a table of comparative dimensions and weights of these machines dated 28.11.22. was given. The following further data may be interesting: Contd. | ||