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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 schemes, armatures, and output for various car models.

Identifier  WestWitteringFiles\U\May1930-July1930\  Scan027
Date  6th May 1930 guessed
  
-2-

So far the scheme has only been running on
Phantom II in conjunction with the experimental 48 coil
armatures for the dynamos though these are likely to be
standardised as a result of running on 23-EX (and 14-GIV
in the 20/25 H.P. case). This type of armature normally
allows the dynamo to give an output intermediate between that
given by the present standard 56 coil normal output armature
and the higher output 56 coil armature, which output we call
"medium output". Modification of the dynamo pole pieces
modifies this output so that it becomes almost exactly
similar to that of the higher output 56 coil armature without
polar modification. We then call the dynamo the high
output 48 coil armature dynamo.

With the reduced charge switching scheme, there
has been agreed to be every reason for maintaining the
height of the output speed curve at speed, but we are still
of the opinion that in the absence of such a scheme it would
not do to use the high output, except in special cases,
because it is definitely bad for the battery. The medium
output 48 coil armature machine without polar modification
is representative of the up-to-date compromise with the size
and drive speed of the machine we can use, and with the now
available improvements in batteries would be reasonably
suitable without the half charge scheme.

For certain classes of work for which the cars
are used e.g. Australia, reasonably early cutting in appears
to be essential.
  
  


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