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).
Armature losses tests for the N.B. (Narrower Brush) type dynamo.

Identifier  WestWitteringFiles\O\2April1926-June1926\  Scan173
Date  27th May 1926
  
Expt. Report.

To R.{Sir Henry Royce} from EFC.
c. to BJ. Wor.{Arthur Wormald - General Works Manager}
c. to Da.{Bernard Day - Chassis Design} E.{Mr Elliott - Chief Engineer}
c. to Rg.{Mr Rowledge} By.{R.W. Bailey - Chief Engineer}
c. to EP.{G. Eric Platford - Chief Quality Engineer}

ORIGINAL

X.8660. EAC. DYNAMO OF THE N.B. (NARROWER BRUSH) TYPE. X8671

Further to our EFC1/T13.5.26. We have conducted some armature losses tests so far with the present standard EAC. dynamo and with the N.B. type machine previously referred to. It will be remembered that the N.B. machine differs from standard in having the narrower brushes as previously reported and the larger air gap of .022" instead of .015", and in no other way except a slight re-adjustment of the angular relations of the brushes to get the best result.

These tests have been done at three different armature rotation speeds of 1000, 1500 and 2000 r.p.m., and with one definite field excitation of 2.00 amperes.

In every case the losses have been determined, making the necessary exact observations of the electrical input of the driving motor, in a manner which has been fully described in connection with other previous tests and utilised in connection with the fan tests, and one in which the actual differences of power required to drive the dynamo in the various conditions are fairly accurately obtained. The losses obtained directly from the tests by taking differences are :-

Contd.
  
  


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