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).
Particulars of the winding and commutator setting for intermediate output armatures for 20 HP and 40/50 HP dynamos.
| Identifier | ExFiles\Box 60\1\ Scan102 | |
| Date | 7th April 1929 | |
| To BY.{R.W. Bailey - Chief Engineer} from EFC. c. BY/RD. X6004 EFC1/T17.4.29. INTERMEDIATE OUTPUT ARMATURES. Further to our EFC4/LG21.2.29, we now give further particulars of the winding and commutator setting of these two 24 slot intermediate output armatures for the 20 H.P. and 40/50 H.P. dynamos:- Armature:- 24/48/4. No. of slots or sections. 24 No. of coils or comm. bars 48 No. of conductors to comm. 96 No. of conductors. 384 Coils per slot. 2 Turns per coil. 4 Conductors per slot. 16 Slot pitch of coils 1 to 6 " " (comm.end) 1 to 7&8 Comm. bar pitch. 1-25-48 M angle for 20 H.P. 48.0° M angle for 40/50 H.P. 46.5° EFC. | ||