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).
Test procedure for a dynamo, detailing final bedding of brushes, load testing, and noise checks.
| Identifier | ExFiles\Box 168a\3\ img266 | |
| Date | 7th January 1930 guessed | |
| -4- (4) Final bedding of brushes. With end cover removed and field resistance short circuited, the dynamo shall now be run on load for 3 1/2 hours at an output of 20.0 + .5 amperes at 13.0 volt. This should render the brush bedding finally satisfactory and allow time for the machine to heat up. (5) Immediately after the termination of the above run, the speed and voltage shall be carefully adjusted until the output of the machine is 20.0 + .2 amperes at 13.0 volts, when the speed should be measured. This should not exceed 1220 R.P.M. (6) With the dynamo still in the same hot condition it should be verified that running on open circuit it shows a voltage of 13.0 at not more than 620 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 14.0 amperes at 13.0 volts. Further, the mechanical vibration due to any want of balance shall not be excessive. | ||