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).
Report outlining the features of different electrical regulation systems, including the Third Brush Regulator and Constant Voltage System.
| Identifier | ExFiles\Box 31\1\ Scan049 | |
| Date | 31th December 1919 | |
| RR 884 A (100 T) (F.F. 846 6-8-19) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2400 -5- Contd. Gr{George Ratcliffe} 1K 12/31/19 (d) Separate detail reports will be compiled and will accompany these sample sets when completed and shipped to Derby for test. It will not be ill-timed to briefly outline the technical features of the systems discussed in this report, and trust the following synopsis will be of interest :- MODERN SYSTEMS : The most common system used in this country is called the Third Brush Regulator, a so-called inherent type of current regulation. One lead of the shunt field is connected to a third brush on the generator commutator, and is so placed, that distribution of the magnetic field set up through the poles of the generator occurs as the output increases, controlling in this way the voltage at the generator terminals. Immediately the generator excites and a very rapid increase in output takes place as the r.p.m. increases. The system has the property of controlling the current output beyond a certain predetermined peak. The magnetic distortion of the field beyond this figure increases so that as the speed continues to increase the output of the generator decreases. The regulation is materially assisted by the electrical characteristics of the battery itself. As the regulation is dependent on the current generated by the armature, a generator of this type slightly increases its output as the battery becomes fully charged. I do not recommend this system for the reason that it is not possible to obtain the degree of regulation desired. CONSTANT VOLTAGE SYSTEM. A system which has found favour of late is the constant voltage system, which maintains a constant voltage at all speeds; the charging current is large when the battery is discharged, and when the battery has reached a charged condition the current input automatically tapers off to a small amount. Contd. | ||