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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).
Dynamo noise reduction and output testing by adjusting the position of the control brush.

Identifier  ExFiles\Box 36\4\  scan 099
Date  27th July 1920
  
Contd. -2- EFC5/T27.7.20.

The amount of movement of the control brush between "normal" and "retarded", represented by these curves, corresponds to about 1 1/2 segments.

Production are satisfied that the noise of the dynamo is sufficiently eliminated by this means, it having been done on a number of machines, but as they are not satisfied in the question of reduction of output, they are handing us over a machine with the two positions marked and asking us to tell them the exact difference in output and to say if we can pass the output with the control brush in the more silent position.

Later.

We have again tried this on our experimental E.575 dynamo on the Bench but do not find the noise to be reduced more than to a slight extent. It has, however, always been the case that the amount of noise on the bench is no criterion of the amount of noise when the dynamo is fitted in position on the chassis with the undershield.

EFC.

[Watermark: EXTRA STRONG]

[Footer: R.R. 233A (100 T) (S.G.S.) 19-3-20 G.2618]
  
  


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