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).
Continued memorandum on dynamo and starter motor winding diagrams and a decision by Mr. Royce on machine configuration.
| Identifier | ExFiles\Box 68\4\ scan0219 | |
| Date | 30th May 1921 | |
| Contd. -2- EFC1/T30.5.21. possible. It is noticed, referring to the winding diagrams which have been previously issued, e.g. E.13768 for the standard E.R. starter motor, D.1506 and D.1512 for the armatures for the dynamo made from starter motor parts, that although the number of slots (which were settled by Mr. Royce after reference to this formula) are in accordance with the formula, the winding diagram is not as is now required, but is made out with equal conductor pitches, resulting in each case in progressive windings where retro- gressive windings would be better. It will now be necessary to alter the instructions for the 45 slot armature to put this matter right. This does not alter the step of the coil, but only concerns the connections and the commutator. The manner in which this affects the already instructed armatures for the Goshawk I dynamo and starter motor will be dealt with in a separate note. In other respects, the instructioning of the dynamo made from starter motor parts stands as already given in the various notes which have been issued. On further thought it has now occurred to us that Mr. Royce has definitely decided that it will not be necessary to make up one of these machines as a plain shunt wound machine as was previously instructed, as all the work on the machine as a plain shunt wound machine can be carried out making use of separate excitation on the field coil winding suitable for third brush control as it stands instructed at present. EPC. | ||