Rolls-Royce Archives
         « Prev  Box Series  Next »        

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).
Investigation into silencing noisy Lucas E.575 dynamos.

Identifier  WestWitteringFiles\E\July1920\  Scan34
Date  27th August 1920
  
To R.{Sir Henry Royce} from EFC
c. to CJ.
c. to Wor.{Arthur Wormald - General Works Manager}
c. to E.{Mr Elliott - Chief Engineer}
c. to Da.{Bernard Day - Chassis Design}
c. to Hs.{Lord Ernest Hives - Chair}
c. to Bn.{W.O. Bentley / Mr Barrington}
c. to PN.{Mr Northey}
c. to By
c. to Wd.{Mr Wood/Mr Whitehead}

ORIGINAL.

X.3014 - LUCAS E.575 DYNAMO SILENCE.

Further to our EFC2/T23.7.20, owing to the
number of noisy E.575 dynamos lately received from
Messrs. Lucas, a visit of their Mr. Ireland to Derby was
arranged. We were not able to be present whilst
Mr. Ireland was here, but during his visit we understand he demonstrated
that the noise of the machines at the particular speed
at which noise was undesirable could be practically
eliminated by moving the control brush backwards (against
rotation) to the extent of one commutator segment.
(No. of commutator segments = 30).

We had previously experimented on these lines
and had found a similar, but not quite so marked, result.
We must found that the speed at which the magnetic hum
was most predominant was slightly altered and possibly the maximum
noise somewhat reduced. We had also shown that the out-put
of the dynamo was reduced by this movement, (see curves
under cover of our EFC7/T18.6.20, from which it will be
seen that the cutting in speed is scarcely affected, but
that the output is decreased in the retarded position.

Contd.
  
  


Copyright Sustain 2025, All Rights Reserved.    whatever is rightly done, however humble, is noble
An unhandled error has occurred. Reload 🗙