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).
Comparison of inherently and externally regulated dynamo systems, referencing specific manufacturer examples like Bosch and Westinghouse.
| Identifier | ExFiles\Box 60\4\ Scan007 | |
| Date | 9th January 1931 | |
| EFC3/ADL9.1.31 contd. -2- upon being connected to a battery. The phenomenon exists only, of course, when the speed is high enough for such control to take effect. At the speeds below the peak output the law is similar to that of a constant speed shunt wound machine in which the voltage falls as the load increases. With regard to the rival claims of externally controlled systems such as mentioned in your second page, we issued under cover of our EFC3/T16.6.26 a general survey of the whole position entitled "The Functioning of the Dyname-Battery Combination of a Chassis Electrical System" divided into three parts as follows :- (1) So-called inherently regulated dynamo systems. (2) Completely externally regulated dynamo systems. (3) Compromises between the two extreme types of dynamo system. in which the rival advantages and disadvantages were considered. A letter received from Mr.Olley as a result of our EFC3/T16.6.26 is of interest in this present connection and therefore a copy of attached hereto. We have never experienced at all satisfactory results either on test on the bench or on chassis of any external vibratory (by which we mean those employing what we call "dithering" contacts) regulator systems except that produced by R.Bosch. Naturally we have been somewhat averse to such systems for this reason, an aversion which has been confirmed by the experience of U.S.A. as outlined in Hs{Lord Ernest Hives - Chair}2/MJ15.1.31. See X1402. We are still in possession of an R.Bosch shunt wound dynamo complete with regulator system upon which system a number of tests have in the past been made and duly reported. We have also had a limited experience of this on chassis. Our opinion is that the system generally, as represented by Bijur, Westinghouse and Bosch, is excellent in principle but extremely difficult to carry out practically with any degree of reliability owing to the use of "dithering" contacts. | ||