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).
Description of the operating principles of an automatic dynamo regulator.
| Identifier | ExFiles\Box 31\1\ Scan136 | |
| Date | 3rd November 1922 | |
| Contd. -4- EFC1/T3.11.22. regulator is at any rate in principle the ideal arrangement, it being possible to arrange this to automatically secure a dynamo output always in conformity with the demand of the moment. In principle the amount of current allowed through the exciting circuit is controlled always in accordance with the demand, not as might be the case in a D.C. lighting station by intelligent hand operation, but by a sort of automat: intelligence consisting usually of some form of vibrating contacts, carbon plate rheostat or quantity of carbon granules under varying pressure, a fixed resistance being placed across the contacts in the first case, and sometimes across the rheostat in the second and third cases. In the first case an [the] average admission of exciting current is controlled by the varying proportion of time on contact during vibration; in the second and third cases, the control is effected by the actual variation of resistance in series with the field circuit. The quantity to be governed may in the one extreme case be the voltage at the dynamo terminals, in which case the operation of the regulator is effected by the magnetic effect of a coil connected as a shunt across these terminals, or in the other extreme case, by the magnetic effect of a series coil carrying the ampere output of the dynamo. Apart from variations of temperature, in principle then the voltage in the one case and the current in the other Contd. | ||