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).
Increasing dynamo output for Phantom and 20 HP models through armature winding modifications.
| Identifier | WestWitteringFiles\U\January1930-April1930\ Scan092 | |
| Date | 1st February 1930 | |
| To R.{Sir Henry Royce} from EFC. C. Sg.{Arthur F. Sidgreaves - MD} C. Wor.{Arthur Wormald - General Works Manager} E.{Mr Elliott - Chief Engineer} C. Ds. Ev.{Ivan Evernden - coachwork} C. PN.{Mr Northey} EP.{G. Eric Platford - Chief Quality Engineer} ORIGINAL EFC1/ADLO.2.30. X.8664. INTERMEDIATE AND HIGHER OUTPUT X.5663. X.8665. DYNAMOS PHANTOM AND 20 HP. X.5664. The problem of increased dynamo output is being met with as outlined below. In the absence of modifications to pole pieces, the three degrees of armature winding coarseness modifications we have made provide a series of three output curves progressively greater in peak output and at the same time, and correspondingly, in cutting in speed. Again, taking any one such winding, it may be said in general as a result of experiments with any modification by which the reluctance of the magnetic circuit is increased, that such increase has much the same effect (assuming a suitable re-setting of the main brushes) as one step of change in the winding coarseness. There may be finer differences in the shapes of the output curves, these being of a nature which are now being studied more in detail, but generally speaking, it does not at present appear to be of great consequence to the shape of curve, when an increase of output (with its corresponding increase in cutting in speed) is desired, whether such change is brought about by change of armature winding or pole piece modification of the magnetic circuit. | ||