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).
Generator control units, including correspondence with the Delco Company and tentative specifications.
| Identifier | ExFiles\Box 31\1\ Scan047 | |
| Date | 31th December 1919 | |
| RR 88 A (100 T) (S.F. 846 6-8-19) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2460 -3- Contd. Gr{George Ratcliffe} 1K 12/31/19. proportions, the control units might possibly be of the vibrator type. After giving some study to this question and in consultation with representatives of generator equipment, I am of the opinion that such a system can be developed to meet the exacting conditions we require. Since your departure I have had further corres-pondence with the Delco Company, regarding the system they are perfecting for the Pierce-Arrow, i.e. a plain shunt wound machine with voltage and current control of the vibrator type, which system embodies the essential features desired. As you are aware, the Delco people have promised a sample system, and as I do not believe information will be to hand to embody in this report regarding this apparatus, I will possibly have to submit a further report later. The following tentative specification is proposed as being within the possible limits to meet our requirements:- (a) The generator to be capable of balancing the battery voltage at a speed not exceeding 400 re-volutions per minute. (b) The generator to be capable of carrying a lamp load estimated 10 amps maximum at a speed of not over 500 r.p.m. the current to the battery when fully charged to be not more than three or four amps. the road speed to be within 10 to 12 miles per hour. (c) The generator and composite units should be capable when supplying current for the lamp load of controlling the current to the battery to within three or four amps. at all speeds above 850 r.p.m. (d) The generator to be capable of generating a current of not more than three or four amps at all speeds when the battery is fully charged and no current is being taken from the battery or the generator | ||