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).
Modifying electrical circuit resistance for a 12-volt battery system.
Identifier | ExFiles\Box 31\1\ Scan021 | |
Date | 30th January 1918 | |
Contd. -2- R4/W30.1.18. resistance in the field circuit and also in the regulator circuits you could get satisfactory conditions of working for a 12-volt battery at a speed not exceeding 1800 revs. it It would suit my purpose well, but since we want/to give about double electro-motive force than that for which it has been designed it would appear that unless the coils are rewound (with more than twice the number of turns) the resistance would have to be increased to about double the present amount by an external resistance. The non-inductive resistance belonging to the field circuit could remain apparently exactly as it is at present because I do not want it to run over such a big range of speed. I should not be likely to drive it at more than 2200 or expect it to do any work at any speed less than 1400, so that the voltage controller has much less work to do than on a car. R.{Sir Henry Royce} R.R. 288A (100) (T.S.D. 648. 10-2-30) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2612 | ||