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 analysis of a vibrator control system, comparing its operation in hot versus cold conditions.
| Identifier | ExFiles\Box 31\1\ Scan077 | |
| Date | 17th August 1920 | |
| Contd. -4- EFC4/T17.8.20. begins. The speed at which the vibrator begins to operate hot, is somewhat higher than for the cold condition, further, the open circuit voltage of the combined dynamo and regulator is greater fro the hot condition than for the cold as would be expecte,d owing to the higher voltage required to push the same current through the solenoid. Curves of field current for the cold and hot conditions are also shown and it will be seen how these bend over before the vibrator begins, due to the resistance of the carbon contact increasing with the fall of mechanical pressure. There is also no abrupt change in the slope of the field current curve at the point at which control begins. The function of the second coil of resistance 141 ohms is to imporve the steadiness of operation of the vibrator. It would be perhaps worth while taking similar curves with this coil cut out of circuit or alternatively placed directly across the main voltage so as to directly assist the 88 ohm coil. X.3560. This we shall probably do sometime, as we think is advisable to throughly study the different systems of vibrator control. We have yet to complete curves of this dynamo and regulator under load conditions, but these we hope to make the subject of a separate report. Contd. | ||