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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 winding and commutator settings for intermediate output armatures.

Identifier  ExFiles\Box 165\6\  img198
Date  17th April 1929
  
X 6003

To BY.{R.W. Bailey - Chief Engineer} from EFC.
c. BY/RD.

EFC1/T17.4.29.

INTERMEDIATE OUTPUT ARMATURES. X6004

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. 48.0º
M angle for 40/50 H.P. 46.5º

EFC.
  
  


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