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 winding diagram and connections for a 4-pole single series type armature.
| Identifier | ExFiles\Box 35\4\ scan 033 | |
| Date | 17th August 1921 | |
| EXPERIMENTAL BY/WERA/EM 17. 8. 21. We have not as yet produced a Winding Diagram but when we say that it is of the 4 pole single series type and connected retrogressively in the manner shewn below, this will enable you to connect up to the Commutator. 29 SLOTS PITCH 1-8 [Diagram showing connections between Top of Slot 1, Bottom Slot 8, Top of Slot 15, Bottom Slot 22, and Top of Slot 29, corresponding to Comm Lugs 1, 15, and 29.] In order to decrease the overhang length there would be no objection to staggering the End Winding and Connections as done on the standard S.S. Motor Armature, but we doubt whether this is practicable as it would appear to complicate the forming of the coils, and of course it is always desirable to have a symmetrically wound armature which would not be so if the coils were staggered. In order that we may go ahead with the mechanical details as soon as possible, BY particularly wishes to see this Armature before despatching to West WitteringHenry Royce's home town. BY/WER. WSR. | ||