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).
Comparative summary of six different dynamo and regulator types, with a detailed analysis of the Aero Type U.B.

Identifier  ExFiles\Box 31\1\  Scan138
Date  3rd November 1922
  
Contd. -6- EFC1/T3.11.22.

(1) Aero type U.B. dynamo & regulator. Single pair of
carbon contacts
(Loaned to us for expl. with varying pressure.
purposes by PN.{Mr Northey}) Resis. as shunt across
field coil & also a
resistance to operate.
No resis. across contacts.

(2) R.Bosch dynamo & regulator. Varying pressure on
quantity of carbon
granules between plates.

(3) Bijur vibrator regulator & dynamo. Metallic contacts,
shunted by resis. and
with second resis.
shunted across field
circuit.

(4) Liberty dynamo & regulator. Metallic contacts
shunted by a resistor.

(5) Scott Series of carbon
plates with varying
pressure, shunted by
a resistance.

(6) Westinghouse dynamo & regulator. Metallic contacts,
shunted by a resistance.

Aero Type U.B.

This we experimented upon and reported in our
EFC4/T17.8.20 and EFC5/T1.10.20. The dynamo is 2-pole 12 volts.
The main operating coil is across the voltage but a resistance
as a shunt across the field coil is also wound on to assist
the operating coil in an additive direction. There is no
resistance across the carbon contacts. These do not behave
like metallic contacts as the whole variation of contact
resistance is brought about by variation of pressure.
Contact is never actually broken as this would reduce the
excitation to zero, but in the later stages of the pressure
Contd.
  
  


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