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 erratic operation of a vibrator regulator on a 12-volt battery and a comparison to its performance on an 8-volt battery.
| Identifier | ExFiles\Box 31\1\ Scan067 | |
| Date | 22th July 1920 | |
| Contd. -5- EFC1/T22.7.20. operating on a normally charged 12,volt battery, are very erratic. After the instant of cutting in, there is a reverse current of 4.4 amperes; this is gradually reduced to zero and increased to a positive value of 7.4 after which the vibrator begins to operate and the current falls again and attains a negative value of 2 amperes. After this again the current becomes positive and remains positive at a value of approximately 1 ampere for speeds above 1600 R.P.M. corresponding exactly with the volt curve already described. It is obvious from the above that something is wrong with this regulator. When allowed to operate on an 8 volt battery the operation is more reasonable, except for the fact that there is too little difference between the charging current given to an 8 volt battery fully discharged, (e.g. a 6 volt battery) and one fully charged, which rather suggests that the operating coil of the Vibrator regulator has been compounded, but compounded to an extent greater than is desirable. We shall now break the sealing and investigate the reasons for these defects, as it is no use putting the machine on a car in this condition. EFC. | ||