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).
The temperature and performance testing of a dynamo's commutator and armatures.
| Identifier | WestWitteringFiles\S\June1928-August1928\ Scan080 | |
| Date | 16th July 1928 guessed | |
| Contd. -2- the carcase as measured by a thermometer in our usual way. That is to say, the commutator and brushes would be relatively hotter in relation to the carcase in this case than in the standard case. The 'maximum permissible' output in this case has therefore to be judged. (in the standard case we know the maximum permissible temperature of the carcase by actual observations when the commutator solder runs). The setting which we have given to the machine is reasonably within the maximum permissible setting as so judged. In spite of the extra heating of the commutator and brushes, we found that with the setting given the com- mutation was satisfactory, the brushes being smooth and the segments clean after several hours' running. It will be remembered that these armatures are of the 28 slot type to correspond with the armatures recently standardised. We hope shortly to receive a Phantom dynamo with a similar coarser type armature. EFC. | ||