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).
Meeting notes regarding the design and testing of a new dynamo armature and brush gear.
| Identifier | ExFiles\Box 168a\3\ img268 | |
| Date | 16th January 1936 | |
| WST see me 8642 Hs{Lord Ernest Hives - Chair}/Wst. BY/RD. C. Ker. Ho. By.{R.W. Bailey - Chief Engineer} E.2/HP.16.1.36. Recording decisions taken at meeting of E.{Mr Elliott - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Wst, and BY/RD on 16.1.36, as a result of inspecting the ventilated dynamo from chassis 31-EX it is agreed that a new armature should be put in hand, and should be regarded as very urgent. This armature is to have 36 slots, 18 SWG wire with the standard insulation and 12 conductors per slot, 72 commutator bars. As a result of a discussion on brush gear design, and an inspection of the work already done, it was agreed to produce a new design which would enable the best material for the brush controlling face to be used, and would facilitate machining of the slot carrying the brush. BY/RD will go into the production of this with Ws. The brush would be fitted with a rigid finger and a spiral steel spring. Finished designs would be made suitable for production to avoid wasting development time, and the end plate of the dynamo would be modified to suit. The end cover of the dynamo is to be fitted with two louvred panels with the louvres looking downwards. The gauze should be retained to minimise fire risk. The inside flanges at present carrying the gauzes can be dispensed with and the gauze can be held in position with the outer pressing in which the louvres are formed. The end cover of the existing dynamo should be cut away to facilitate the passage of the cooling air as at present the space between the end cover and the armature appears somewhat of a bottle neck. It was agreed that in view of the result from the 15,000 miles test, a standard Phantom III dynamo should be put on the bench to undergo an equivalent bench test, so as to compare the brush and commutator wear with the results obtained on the road. | ||