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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).
Test data and diagram for a Lucas E.575 Dynamo, detailing current measurements at various speeds.

Identifier  WestWitteringFiles\C\May1919\  Scan51
Date  6th May 1919
  
R.R. 235A (500 T) (S.D. 40s. 26-4-17.) Bm. 2/156/13.

6.5.19.

LUCAS E.575 DYNAMO.

Table of currents.

Speed. | Main current. (M) | Field current. (F) | Control current. (C) | Main + ve brush current. (M + F) | Main - ve brush current. (M + F - C).
725 | 0 | 1.9 | -7.1 | 1.9 | 9.0
1000 | 5.85 | 2.1 | -1.25 | 7.95 | 9.2
1250 | 9.4 | 2.2 | 4.25 | 11.6 | 7.35
1500 | 11.4 | 2.2 | 8.7 | 13.6 | 4.9
1750 | 12.2 | 2.2 | 11.8 | 14.4 | 2.6
2000 | 12.5 | 2.2 | 13.6 | 14.7 | 1.1
2200 | 12.5 | 2.2 | 14.6 | 14.7 | .1
2250 | 12.5 | 2.2 | 15.0 | 14.7 | -.3
2500 | 12.5 | 2.15 | 15.7 | 14.65 | -1.05
2750 | 12.4 | 2.15 | 16.3 | 14.55 | -1.75
3000 | 12.3 | 2.1 | 16.4 | 14.4 | -2.8
3250 | 12.1 | 2.1 | 17.0 | 14.2 | -2.8
3500 | 12.0 | 2.1 | 17.3 | 14.1 | -3.2

[Diagram of a dynamo showing currents]
Labels: C, c, M+F, +, -, M+F-C

Maximum current 17.3 amperes.
Brush area 2 x .625 x .300 = .375 ☐"
Amperes per square inch (max) = 46.1
  
  


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