Rolls-Royce Archives
         ยซ Prev  Box Series  Next ยป        

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).
Calculations and discussion on the number of conductors required for E.A.C. and Goshawk starter motors.

Identifier  ExFiles\Box 35\4\  scan 142
Date  30th April 1923 guessed
  
-3- Contd.

higher, so that we are led to the conclusion that the
number of conductors requires increasing.

Fixing, as we do, the speed N = 1760, and
taking a suitable flux density of 6500 in each case, in
the case of the E.A.C. motor where

โˆ… = 194,000

Z should lie between the limits 59 and 66, but owing to
the relatively light load, should be actually nearer
to 59, and that in the case of the Goshawk motor where

โˆ… = 161,000

Z should lie between the limits 71 and 80.

It will be seen that we cannot fix the dimensions
of the machine, the speed and the number of conductors,
except within certain limits. This we are wrongly
attempting to do in both cases.



Attached please find copy of the revised E.A.C.
starter motor calculations, which ofcourse only represent
our final conclusions during my visit, together with copy
of calculations for the adaptation of the Goshawk size of
motor as far as estimation of number of conductors only,
so perhaps you will now further consider what course we
should take with R.{Sir Henry Royce} re this. I will, if you like, explain
the matter direct to him, or alternatively you could write
sending copies of these calculations.

EPC.
  
  


Copyright Sustain 2025, All Rights Reserved.    whatever is rightly done, however humble, is noble
An unhandled error has occurred. Reload ๐Ÿ—™