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 and proposed modifications to improve dynamo performance.
| Identifier | ExFiles\Box 62\3\ scan0399 | |
| Date | 20th October 1933 | |
| 86142 E.{Mr Elliott - Chief Engineer} From Hs{Lord Ernest Hives - Chair}/Wst. c. to By/RD. c. to Wor.{Arthur Wormald - General Works Manager} BENSPORT DYNAMO. We have been conducting a number of experiments recently on the Bensport dynamo to improve its output-heating characteristics and especially its maintenance of output at high speed. Our experiments have been on the lines of reducing iron coil loss, armature winding heating by reducing resistance, and by increasing the field rigidity for improved commutation. We now wish to try an experimental Bentley dynamo with the following modifications :- (a) Armature diameter to be reduced to 3.105" (b) Armature slots to be cut to accomodate 12 conductors of 16 SWG. D.C.C. Superfine. The slot dimensions will be approx. .175" wide and .540" deep. (c) Armature stampings to be brought slotted in Messrs. Sankey's "Medium Resistance" material. (d) Field pole core length increased by the amount of reduction in the armature radius and the field winding to fill up available space with 20 S.W.G. D.C.C. Superfine wire (approx. 260 turns per pole.) We anticipate that this dynamo will give us increased output, only very small reduction of output at high speeds as compared with low speeds, much better commutation, and practically no appreciable increase in the cutting in speed. | ||