GB626291A - Improvements in and relating to remote control systems - Google Patents

Abstract

626,291. Electric follow - up systems. SPERRY GYROSCOPE CO., Inc. July 29, 1944, No. 14539. Convention date, July 30, 1943. [Class 40 (i)] In a remote control system, a signal, varying in sense and magnitude in conformity with a controlling member, controls an electric motor in corresponding speed and direction and this determines the rate of a variable speed driving device connected with the load. A controlling shaft 17 positions a rotor winding 18, fed with alternating current from a source 22, and currents induced in the stator 21 are passed to a remote stator 23. Error signals generated in the controlled rotor 25 are passed to phasedetecting valves 34, 35 which produce voltages across resistors 47, 51 dependent on the polarity and magnitude of the error signals, and these voltages are amplified in valves 65, 66 whose outputs are connected to the field winding 69 of a differential motor 71. The armature 85 is fed from a source of D.C. supply 86 and thus rotates shafts 88, 14 as long as an error signal exists, thereby shifting the movable element 97 of a variable ratio friction driven device 92, driven by a constant speed motor 99. The driven member 102 drives the controlled shaft 28, carrying the rotor 25, and output shaft 13. As long as there is a discrepancy between the speeds of the shafts 17, 28 an error signal exists which adjusts the variable speed device until there is no signal and no phase lag between the shafts. In order to prevent hunting by the variable speed device, a differential gearing 104 is adjusted, through gears 109, by the rate shaft 14 so as to produce an additional displacement directly proportional to the movement of the armature 85. The amplifier valves 65, 66 are stabilized by degenerative feed-back obtained from a magneto generator 114 driven by the motor shaft 88.