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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 fusing systems and the volt-ampere characteristics of 'inherently controlled' dynamos.

Identifier  ExFiles\Box 31\1\  Scan134
Date  11th November 1922
  
Contd. -2- EFC1/T3.11.22.

current to remain at a reasonable value (either steady or
falling) for further increase of speed, after the maximum
output has once been reached.
In order to afford protection to such a dynamo and
to the battery with which it is run, various schemes of
fusing are used. In the nature of things no system of
fusing can be entirely satisfactory and there is really no
best system owing to the varying circumstances of the case.
It is therefore a matter of opinion as to what fusing system
should be adopted, though we do not intend to discuss this
further at this point.
There is another objectionable feature of the so-
called 'inherently controlled' dynamos (on any and every
system) namely that although all these dynamos possess
intrinsic volt-ampere characteristics somewhat similar to
those of ordinary shunt machines, nevertheless they are not
working, except at slow speeds, on the top part of the
characteristic where an increase of amperes is accompanied
by a decrease of volts. They are, on the other hand,
nearly always working on the lower portion of the characteristic
where the increase of volts and increase of amperes occur
together. The result of this on the chassis system is
that the higher the E.M.F. of the battery or the P.D. of the
battery light system, the more current is generated by the
dynamo, tending to further increase the E.M.F. or P.D.
Contd.
  
  


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