GB487226A - Improvements in or relating to electric remote control systems - Google Patents

Abstract

487,226. Electric signalling systems. VICKERS - ARMSTRONGS, Ltd., and WATSON, J. P. Dec. 4, 1936, No. 33349. [Class 40 (i)] In a remote control system, the field winding 1 of the transmitter is connected to the supply, the armature 2 being connected to the stator winding 9 of the receiver having an armature with one or more paths 14 of low magnetic reluctance. For asynchronous running, the rotor 13 is provided with conducting paths to allow induced currents to circulate in the manner of an induction motor rotor. In order to provide the necessary phase shift in the supply to the receiver, a condenser 23 may be inserted in one of the lines. In a modification, Fig. 5, the switch 27 has four positions, and the rotor consists of two parts, rotor 37 being of the type used in Fig. 2, while rctor 38 is of the squirrel cage type. As shown the receiver rotor will run as an induction motor, whereas upon the connection, segment 36 to stud 29, being completed, the rotors will move in synchronism. With the switch arm 27 on the stud 32, there will be a position of the rotor 2 where no current is supplied to stator 9 and upon its being turned from this position, the rotor 37, 38 will rotate asynchronously, its velocity being dependent on the deviation of the rotor 2 from its zero position, but independent of its sign. In order to provide rotation of rotor 13 in the opposite sense, the switch arm contacts with stud 34. Instead of a composite rotor, a rotor as used in Fig. 2 may be employed. In a further modification, separate stators 9 and rotors 37, 38 are used, the supply being fed to one or other of the stators and a second switch being used to perform the functions of switch 27. Where there is persistent lag between the rotors, the difference between the position of the transmitter and receiver may be arranged to operate a hunter switch to cause the receiver to be carried towards synchronism by induction motor effect.