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 development and testing of new 24-slot armatures with a view towards standardization.
| Identifier | ExFiles\Box 165\6\ img208 | |
| Date | 20th August 1929 guessed | |
| -2- these have been developed with a view to their becoming the standard armatures for both chassis if they shew satisfactory performance. The present position is, that we have just received for laboratory experimental test, one intermediate output machine of each chassis type. The general scheme of these armatures is similar to the present standard 28 slot armature but they are made with 24 slots or sections in place of 28, with 48 coils and commutator bars and 384 conductors. The winding is the usual retrogressive wave, but as in the standard case, an extra coil is included as a lap, coil instead of being put in as a dummy. In connection with these new armatures we have systematized the method of drawing armature diagrams to make it possible to obtain the exactly required angle between the neutral axes of commutation and the main brushes in the first instance, i.e. without the necessity of subsequent adjusting as heretofore. The results of tests of these intermediate output machines will be reported in due course, we have however, every reason to believe that the output curve and performance of the machines generally will be initially satisfactory, so that the machines can, at an early date, be put on a 10,000 miles test with a view to early ultimate standardisation. EFC. | ||