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).
Technical report on an overheating dynamo from chassis 91-MC, which caused melted solder.
| Identifier | ExFiles\Box 70\3\ scan0335 | |
| Date | 9th December 1927 | |
| To Mr. Brock. c. BY.{R.W. Bailey - Chief Engineer} X&783do EFC3/T9.12.27. 40/50 DYNAMO CT.85 EX CHASSIS 91-MC, This machine has been duly examined and tested, the complaint having been 'solder melted at commutator and burning of No.1 contact in switchbox'. This machine, of the old standard type, was found to have the early control brush setting of 120°, and the melting of the solder was probably due to excessive output largely as a result of this setting. The armature and the field coils do not appear to be otherwise damaged. Though the control brushes were rather badly worn and the inner one slightly sluggish in its holder, there does not appear to be any signs on the commutator of undue sparking having taken place. It would therefore appear to be purely a question of overheating just only sufficiently to melt the commutator solder. Dynamo herewith to BY.{R.W. Bailey - Chief Engineer} EFC. | ||