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).
Discussion comparing 12-volt and 6-volt vibrator regulator systems, focusing on dynamo overloading and lead resistance.
| Identifier | Morton\M2.3\ img026 | |
| Date | 17th August 1920 | |
| Contd. -6- EFCl/T17.8.20. 973 the two in operation on both on the bench and also perhaps on the car. He agreed that the present design of regulator was bad to make and also had a "messy" appearance when finished. One of the points he made against the 12 volt vibrator regulator system was that there would be more tendency for the dynamo to be over-loaded when the battery was low than in the case of 6 volts. This, one would think, would be merely a question of adjusting the resistance of the leads proportionately, the usual tendency being for the relative resistance of the leads on the 12 volt system to be lower than on the 6 volt. For equivalent operation it would appear that the leads on the 12 volt system should have four times the resistance of those on the 6 volt. Mr. Bijur stated that the system had been used on train lighting and that, in order to overcome the over-loading of the machine whilst the battery was low, a separate main current operated relay was employed which definitely caused the vibrator contacts to be held apart above a certain main current. EFC. | ||