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).
Proposal to trial a new 28 slot armature for the Phantom Dynamo to reduce noise.
| Identifier | ExFiles\Box 68\4\ scan0005 | |
| Date | 25th April 1927 | |
| TO RHC{R. H. Coverley - Production Engineer} C. EFC. x 8672 BY/RD1/ML 25.4.27. PHANTOM DYNAMO. 28 SLOT ARMATURE - SEC:8070 & 8090. In order to try to make the dynamo quieter we are proposing to try a 28 slot armature in a similar manner to the 20 H.P. dynamo. This armature is quite standard except for the number of slots and the commutator can be adjusted by making the micas a shade thicker to compensate for the loss of one bar. Blueprints herewith of:- D.71347 - Armature Assembly. D.71347 - L.O.P. Armature. D.71348 - Winding Diagram. D.71349 - Insulating Segment. D.71350 - Commutator Assembly. D.71350 - " L.O.P. Will you please put 3 armatures in hand. BY/RD. | ||