Patent GB-515726-A (GB)
Title: Improvements in and relating to turbo-electrically driven vehicles
IPC: H02P9/00
Filed: 1938-06-27
Abstract: 515,726. Electromechanical transmission of power. BRITISH THOMSON-HOUSTON CO., Ltd. June 27, 1938, No. 19012. Convention date, June 25, 1937. [Class 38 (iv)] A turbo-electric driven train or other vehicle using. D.C. power transmission and a boiler with forced circulation has a main turbine 1 driving, through gearing 2, a main generator 3, and two or more auxiliary generators 5, 6, the generator 5 operating an auxiliary system Ha with extensively variable voltage, while the generator 6 feeds an auxiliary system Hb with approximately constant voltage, the arrangement being such that one or both auxiliary generators can be driven either by the main turbine or separately by an auxiliary turbine 7 'through detachable couplings 4, 9 respectively. With this system the steam supply to the main turbine may be shut off when no current is needed for the main driving motors 37. The main generator 3 has a shunt winding 31 with a shunt regulator 32 which acts as the speed regulator for the vehicle. This generator, through a change over switch 34 and reversing switch 35 feeds the main driving motors 37. Alternatively, for shunting or slow-running, by putting the change-over switch into position b the main motors may be fed by the auxiliary system Ha. The coupling 4 may be a liquid coupling, both halves of which, after reaching approximately equal speed, .are rigidly coupled mechanically, e.g., through a friction coupling by a coupling-lever 41. The auxiliary generator 5, for variable voltage, has a shunt regulator 51, and supplies two fan motors 53 for condensing-plant, and a motor for the flue gas fan 54, the latter having a shunt field regulator 55. The auxiliary generator 6 has a shunt regulator 61 by means of which the voltage in system Hb is kept substantially constant. The switches 63, 64 are closed during running, the generator thus supplying pump motors 65, 66 air compressor 67 and battery 68. Connections 69 for the control and actuating devices of the vehicle also branch off from this system, as well as lighting and heating circuits 601, 602 respectively. A coupling switch 651 and line 650 between the systems Ha, Hb, provide means whereby the system Hb or part thereof may be supplied from system Ha; for example, the motors 65, 66 may be started by employing the variable voltage of system Ha. When the vehicle is stationary or running without current the systems Ha, Hb are fed by.generators 5, 6 driven by the auxiliary turbine 7, the coupling 9 then being coupled and 4 uncoupled. The change-over to the auxiliary system may be initiated by the main turbine or the auxiliary turbine, or automatically in dependence on the actual load on the main generator. For example, on the driving motor system 36 becoming currentless a relay is operated to start the auxiliary turbine 7, and when speeded up the coupling 9 is closed, and the coupling 4 to the main turbine disconnected. This may be effected by electromagnetic control having a time delay. When the main system is operative the voltage regulation of the auxiliary system Ha is preferably effected automatically in dependence upon the load on the main turbine 1. For example a Venturi tube may be inserted in the steam supply pipe to the main turbine and provided with means for adjusting the shunt regulator 51 of generator 5. This shunt regulator may also be adjusted in dependence on the current output of the main generator, or a governor control may be employed in known manner.