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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 performance of a machine fitted with Ubas steel pole forgings, detailing test results under cold and hot conditions.

Identifier  WestWitteringFiles\L\2Jan1924-March1924\  Scan72
Date  13th March 1924
  
Contd. -4- EFC1/T13.3.24.

curve for much the same temperature condition (though
possibly 5° hotter), also a curve (long dashes) indicating
the general specification of performance of machines for
40/50 chassis. It will be seen that the curve of
performance now secured readily complies with this specification.

For production purposes Ubas steel pole forgings
have been adopted, and this particular B machine has been
fitted with these pole pieces of similar dimensions to the
M.S. ones giving the best result. A complete investigation
of the output performance of the machine so fitted has been
made, the results of which are as follows :-

Arranged as a shunt machine, i.e. with control
brush lifted and connected to the negative brush:-

AS
SHUNT
MACHINE
{
(a) In the cold condition a balancing terminal
P.D. of 12.4 volts is put up at 412 r.p.m.

(b) In the hot (75°C) condition a balancing P.D.
of 13.6 volts is put up at 472 r.p.m.

(c) The ampere output performance rises sharply
as the speed is increased above the balancing speeds
mentioned, reaching 10 amperes in the cold condition
at 600 r.p.m. and nearly 11 amperes in the hot condition
at 700 r.p.m.

The characteristic open circuit, <handwritten>controlled</handwritten> volt-speed performance
in comparison with <handwritten>that of</handwritten> <strikethrough>of</strikethrough> one or two other <handwritten>controlled</handwritten> machines is shown on
the side of curves labelled C attached, together with a
table of balancing speed ranges between the cold and hot
conditions.

Contd.
  
  


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