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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).
Correcting car dynamo performance by adding resistance rather than altering the 3rd brush position.

Identifier  ExFiles\Box 60\4\  Scan071
Date  6th April 1931
  
X6099
HS.{Lord Ernest Hives - Chair} FROM R.{Sir Henry Royce}
R1/M4.6.31.
C. to SG.{Arthur F. Sidgreaves - MD} WOR.{Arthur Wormald - General Works Manager} BY.{R.W. Bailey - Chief Engineer} CAR DYNAMOS - SERIES WINDING.

"Referring to HS{Lord Ernest Hives - Chair}/PGT1/AD2631., it is no use testing this opposed to the main

It was quite wrong to alter the position of the 3rd. brush as this more than neutralised the series turns, but instead you ought to have inserted some resistance in the main existing circuit pending a slightly finer winding. This could have brought down the peak and then the current at high speeds would have been better maintained by the series winding.

[Graph with Y-axis labelled 'Amps.' and X-axis labelled 'Revs.']

R
With series, but peak corrected by resistance.
Without series.
  
  


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