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 12-volt versus 6-volt vibrator regulator systems and dynamo overloading issues.
| Identifier | ExFiles\Box 180\M2\M2.3\ img026 | |
| Date | 17th August 1920 | |
| Contd. -6- the two in operation 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 [handwritten: 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. EPC. | ||