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).
Description of the dynamo regulation using the 'Rotax Leitner System' and the connected Lucas switchbox.
| Identifier | ExFiles\Box 26\2\ Scan038 | |
| Date | 6th October 1919 | |
| Contd. -3- EFC2/T6.10.19. brush placed approximately midway between the other two. If this control brush be removed from the commutator, the dynamo immediately becomes practically a plain shunt wound machine with its brushes in very approximately the neutral position. If the dynamo were run in this way and switched on to charge the battery it would be found that the current deliver-ed{J. L. Edwards} to the battery, increased indefinitely as the speed rose, starting from the point of cutting-in. There is, however, a control winding on the field pole connected between the control brush and the main negative brush ( when the charging switch is on) which, by setting up an opposing magnetising force on the field pole, and in conjunction with the armature reaction of the machine, causes the current delivered by the dynamo, after rising to a certain point, to remain approxi-mately constant on further increase of speed. This scheme of regulation is known as the "Rotax Leitner System". It will be seen that this scheme of control necessitates bringing away from the dynamo four leads, one of which is the main positive, the other three of which are field, control and negative respectively. These are brought from the dynamo to the Lucas switchbox by means of a four core cable. (b) SWITCHBOX. A Lucas switchbox containing the automatic cut-out for the dynamo, charging switch, and head, side and tail lamp switches, also terminals for the dynamo, battery and lamp connections, is fitted to the instrument board. Contd. | ||