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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).
The function of an external regulator for a dynamo and battery system.

Identifier  WestWitteringFiles\O\2April1926-June1926\  Scan206
Date  2nd June 1926
  
EFCL/T12.6.26. -6- Contd.

should remain constant on the mains, and in the present case,
for reasons in connection with the battery, which will not
here be given in detail, the reverse would be the case, namely
that it would be more expedient to allow the voltage of the
system (say, at the distribution box) to fall so much per
ampere of current delivered by the dynamo. What is ideally
required then is an external regulator or automatic intelligence
which controls the amount of field or exciting current of the
generator in such a way as to maintain constant some chosen
combined function of the voltage of the system and the ampere
output of the dynamo. The point we wish to emphasize is that
in the case of such a regulator, being electro-magnetically
operated, we need not necessarily consider it as a voltage
controller because it can just as readily be a current
controller or a controller of any combined function of voltage
and current output which we like to make it. In the actual
case, however, since we want all the advantages available
with such a system, and in particular that of being able to run
with the battery disconnected, it would be necessary to make
this function contain voltage principally, and only to be
affected in a lesser degree by the current sufficiently to
prevent too great a load on the dynamo at the time of big
demand, or when, with little demand, the battery is unusually
low in E.M.F.

Contd.
  
  


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