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).
Series of test procedures for a dynamo, covering electrical and mechanical performance.
| Identifier | ExFiles\Box 62\3\ scan0365 | |
| Date | 4th July 1933 guessed | |
| -4- (5) Immediately after the termination of the above run, the speed and voltage shall be carefully adjusted until the output of the machine is 16.0 .2 amperes at 13.0 volts, when the speed should be measured. This should not exceed 1360 R.P.M. (6) With the dynamo still in the same hot condition it should be verified that running on open circuit it shews a voltage of at least 13.0 at 810 R.P.M. (7) The dynamo shall again be run on load and its speed varied up and down with a view to testing for mechanical and electrical noise. (8) The dynamo shall now be run up to 5,000 R.P.M. still on load, the field resistance being progressively increased as the speed increases, and shall show no abnormal brush sparking when delivering 10 amperes at 13.0 volts. Further, the mechanical vibration due to any want of balance shall not be excessive. (9) Examine also for rubbing armature, slack bearings, cracked insulation and final conditions of commutator and brush surfaces, and see also that with the dynamo hot the end cover can be easily put on and taken off. (10) The insulation of the machine should be tested whilst still hot by applying through a low C.P. 200 volt lamp and alternating voltage of 200 between the windings and the frame, when the lamp should show no signs of being lighted. Ha/Pgt. | ||