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).
Specification for a running test of a 40/50 HP Dynamo.
| Identifier | ExFiles\Box 60\2\ Scan037 | |
| Date | 11th June 1931 | |
| 11.6.31. SPECIFICATION OF RUNNING TEST OF 40/50 H.P. DYNAMO. Armature :- 24 slot 20 conductors. 17 S.W.G. Poles :- .022" air gap increasing to .065" Brush angles :- 20° 120°. The machine is assumed to have all mechanical adjustments correct and brushes approximately bedded. (1) In order to get the brushes finally bedded and the commutator surface with its working skin formed, the machine should be run with end cover removed for 3 1/2 hours at 1550 R.P.M. with a terminal voltage between 18.0 and 18.5 (2) At the end of the above run, with the voltage adjusted to 18.5 ± .1 the output of the machine should fall within the limits 16.0 and 17.0 amperes, at 1550 R.P.M. (3) With the dynamo still hot it should show an open circuit voltage of 14.0 at not more than 650 R.P.M. (4) Now run the machine at varying speeds up to 3,600 R.P.M. and observe that noise, brush sparking and mechanical balance are reasonable. Afterwards confirm the condition of the machine by a general inspection. (5) Apply an alternating voltage of 200 through a low c.p. lamp between terminals and case and confirm that no failure of the insulation occurs. HS {Lord Ernest Hives - Chair} /CAP. | ||