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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).
Specifications for a 20/25 HP Tank Engine Dynamo.

Identifier  ExFiles\Box 163\6\  img001
Date  11th January 1934
  
86008.

By/CGH.{W Clough}
From Hs{Lord Ernest Hives - Chair}/Wst.

Hs{Lord Ernest Hives - Chair}/Wst.8/MA.11.1.34.

20/25 HP. TANK ENGINE DYNAMO.

Replying to your By/CGH.{W Clough}7/G.13.12.33
the dynamo particular are as follows :-

Armature.
Made up of stamped slotted plates in Sankeys Steel and wound with 2 coils per slot 2 turns per coil of 15 S.W.G. D.C.C. (extra fine) wire. The slot depth to be the same as on drawing D.73840.

Brush angle - 15º

Brushes - not finally decided

Field - as many turns possible of 20 S.W.G. D.C.C. (extra fine) wire.

The pole core should be as deep as possible and the armature core reduced in diameter consistent with the reduction in the slot depth caused by the fewer number of conductors.

Hs{Lord Ernest Hives - Chair}/Wst.
  
  


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