GB199357A - Systems for the transmission of angular motion - Google Patents

Abstract

199,357. British Thomson-Houston Co., Ltd., (Assignees of Hildebrand, L. E.). June 16, 1922, [Convention date]. Order apparatus.-In a system for transmitting angular motion, the output of the transmitter is amplified for the operation of any desired number of receivers. The armature winding of the transmitter 10, Fig. 1, comprises three windings 14, 15, 16 connected respectively to the grid circuits of three vacuum tube amplifiers 17, 18, 19. The output circuits of the tubes are connected to the primaries 34 of transformers 31, 32, 33, the secondaries of which are connected to the receiving circuit mains 37, 38, 39. Receivers 40, 41, 42, similar to the transmitter 10, are connected to the mains 37, 38, 39. The field windings of the transmitter and receivers are supplied from singlephase mains 13. Movement of the rotor of the transmitter 10 varies the voltages induced in the armature windings and these voltages are transmitted through the tubes 17, 18, 19 to the mains 37, 38, 39. An unbalanced voltage condition is thus caused between the receivers and their supply mains, and equalizing currents are set up in the armature winding of the receivers to exert torques on their rotors and so reproduce any movement imparted to the transmitter. In the modification shown in Fig. 2, differences in the voltages of the transmitter and receivers are applied to the grid circuits of the vacuum tubes. The primary windings 53 of the pairs of transformers 50, 51, 52 are connected across the armature windings 14, 15, 16 and the primaries 54 are connected to the receiving circuit mains which are supplied by transformers 31, 32, 33. The secondaries 58, 59 of each pair of transformers are connected in series and in opposition in the grid circuit of the tubes, so that when the receivers are in angular agreement with the, transmitter no voltages are impressed on the grid circuits. In a further modifi. cation, the primaries 54, Fig. 2, are connected through conductors 55, 56, 57, Fig. 3, to an auxiliary transmitter 60 which is directly connected to a receiver 40.