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).
Trials to suppress armature rotation and a comparison between an RR motor and a Bosch motor.
| Identifier | WestWitteringFiles\Q\2April1927-June1927\ 100 | |
| Date | 16th May 1927 guessed | |
| -6- Contd. see what other trials to make. but if we have any means of suppressing the rotation of the armature by bye-passing some of the armature current though still leaving a small turning effect (slow, but as rigid as possible) that would appear to be the necessary condition for getting the present machine to work. A larger angle of helix would help frictional effect, but the first fault is the too fast rotation of the armature. The voltage across the armature terminals rises on the RR. motor very much higher than it does on the Bosch, due to the rotation of the armature , and the longitudinal force is thereby reduced. It will probably be desirable for me to bring to you this RR. motor and the R.Bosch motor for comparison. EFC. | ||