Patent GB-232571-A (GB)
Title: Electric differential control system
IPC: G08C19/38
Filed: 1925-03-23
Abstract: 232,571. Granat, E., and Compagnie des Forges et Acieries de la Marine et d'Homecourt. April 19, 1924, [Convention date]. Selective distant control systems.-Relates to systems in which the movements of the controlling parts at the transmitter are added algebraically at the receiver. As shown in Fig. 1, which shows side and end views of the transmitter, the transmitter A comprises an electric motor having its armature supplied with direct current by brushes 9, 10 which rest on the commutator 7 and are conected by slip-rings 17, 18 and brushes 19, 20 to the mains L. The brushes 9, 10 are adapted for displacement on the commutator 7 through a gear wheel 21 and pinion 22 by a controlling handle V<1>. The field of the motor comprises a polyphase winding 2 fed from three or more stationary brushes 11, 12, 13. The arrangement is such that whatever the position of the brushes 9, 10 the fields of the rotor and stator are 90‹ out of phase. A commutator 8 mounted at the opposite end of the armature has three or more movable brushes 14, 15, 16 adapted for operation bv a handle V<2> through a gear wheel 28 and pinion 29. These brushes are connected respectively to slip-rings 22, 23, 24 which in turn are connected by line wires 30, 31, 32 to a polyphase rotor of the receiver. The field of the receiver is supplied from the mains L. Movement of the handle V<1> to displace the brushes 14, 15, 16 causes variations in the two potentials applied to the receiver rotor phases. The resultant rotor field is thus displaced and the rotor repeats the movement of the handle. V<2>. Movement, of the brushes 9, 10 by the handle V<1> causes a displacement of the resultant field of the transmitter motor and thereby a further redistribution of potentials under the brushes 14. 15. 16 and a further displacement of the receiver rotor. The total movement of the rotor is thus the algebraic sum of the movements of the control handles V<1>. V <2>. Fig. 2 shows a modified receiver in which a local correction can be made. The field comprises a closed winding 43 connected to a commutator 44 with which co-operates two brushes 45, 46 controlled through a gear wheel 47 and pinion 48 by a wheel V<3>. The brushes are. fed through slip rings 49, 50 from direct current mains 41, 42. Movement of the wheel V<3> displaces the resultant field and thereby causes rotation of the receiver rotor (not shown). In the modification shown in Fig. 4, four controlling movements may be added bv the receiver CThe line wires of the transmitters A<1>, A<11>, each of which is similar to the transmitter A, Fig. 1,. are respectively connected to polyphase windings. on the stator 53 and rotor 54 of an autosynchronous motor C. Rotation of the wheels. V\, V<1>, causes a corresponding rotation of the stator field. Similarly the motor field is dis-- placed by movements of the wheels V1<11>, V2<11> and the amount of rotation of the rotor is thealgebraic sum of the movements of the controlling handles. Any number of movements may be added at the receiver, bv using a number of control systems in combination. Instead of employing a motor at the transmitter a generatormay be utilized. In this case the brushes 9, 10' are omitted and the brushes 11, 12, 13 are rotatable. Specification 174,082 is referred to.