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 discussing the adoption and modification of a Bijur Dynamo & Regulator for a 12-volt system.
| Identifier | Morton\M1.3\ img001 | |
| Date | 30th January 1918 | |
| R R.{Sir Henry Royce} 235 A (400 T) (S.C. 536. 15-2-16) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 1546 To EFC. from R.{Sir Henry Royce} c. to BJ. ORIGINAL RECEIVED 1 FEB 1918 X.323( Re - Bijur Dynamo & Regulator. With reference to the above I am very interested in the excellent diagrams of the working of this apparatus which you have made. I have always had the impression that it is an excellent system which as a dynamo should run better (cooler) than any of the type built on the lines of the C.A.V. or Lucas, and since we may adopt such a system on our car lighting in future, I think it would be as well for you to send me this dynamo regulator and connecting switch here, especially if you find that it can be made to work for a twelve volt battery without an excess of speed. It would appear that the volts get up to the seven at about 700 r.p.m. To charge a 12-volt battery it would appear to require some change in the resistance (possibly by an external coil) of the shunt winding as well as in circuit of the winding of the regulator, and the cut in switch. It could probably, then be made to give the necessary volts to charge a 12-volt battery at about 1400 revs. I do not think this would be prohibitive for my purpose, as I can run it at a fairly constant speed. The amount of current I should want it to give need only be 6 amps. so that if with additional 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 | ||