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).
Continued report on dynamo performance, discussing the effects of adding ballast resistance to the field current.
| Identifier | WestWitteringFiles\D\January1920\ Scan43 | |
| Date | 21th January 1920 | |
| Contd. -2- Whereas a material reduction in the field current is secured by the addition of this amount of ballast resistance, which reduction would lessen the possibility if the field coil being roasted, nevertheless, we find that the effect on the ampere output of the machine working normally on a battery is reduced by the insertion of this resistance from 11.6 amps. to 9.5 amps. the dynamo being in a moderately hot condition. It appears, therefore, that this alternative to a fuse in a field circuit scarcely meets the case in the case of the Lucas type of dynamo with a control winding. We shall make another trial of this idea on the Smith type of dynamo with the Trier & Martin regulation. Ck.{Mr Clark} | ||