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).
Letter regarding an experimental report on chassis electrical systems, generators, and regulators.
| Identifier | ExFiles\Box 59\1\ Scan072 | |
| Date | 24th July 1926 | |
| X.4008 Oy 2/E72426. July 24th 1926. Mr. Basil Johnson, Rolls-Royce Ltd.l London, England. (Copy for attention of Mr. Royce " " " " Works Committee. " " " " Mr. Nadin ) Dear Sir: Experimental Report (Derby) Re Chassis Electrical System. Report on Generator and Regulator. Referring to EFC3/T16.6.26. from our experience with plain shunt wound generators working with "voltage-regulators" of the vibrating contact type, we do not believe that the ultimate development should be along these lines. We have now used this combination for over five years, first Bijur and then Westinghouse. We are making efforts to get the Rolls-Royce generator into production as soon as possible, for the reason that we believe the third brush machine with charging switch, or some other means of external control, is a better arrangement for practical purposes. A confirmation of this is the fact that makers who still use voltage regulators, or are developing them for bus work, are invariably using them with third brush machines. (For example; Delco, Leece-Neville, North-East, etc.) Our experience with both the Bijur and the Westinghouse was satisfactory so long as we had a belt-driven generator. Looking back, we can only suppose that slipping of the belt-drive itself prevented overloading. There was always a certain percentage of "flickering" regulators on new chassis, but once successfully "launched" they have given satisfaction through years of use, and our service replacements have been very few. But, with a positive drive to the generator, there is a greater demand for a perfect action in the regulator, since the slightest tendency of the points to stick causes an immediate rise in voltage and tends to damage the points. Trouble Contd. Handwritten text: X8280 X1402 X4008 | ||