Patent GB-625430-A (GB)
Title: Apparatus for the summation of vector quantities
IPC: G06G7/22
Filed: 1946-06-14
Abstract: 625,430. Calculating-apparatus. WESTERN ELECTRIC CO., Inc. June 14, 1946, No. 17943. Convention date, June 30, 1944. [Class 106 (i)] [Also in Group XXXVIII] Three-dimensional vectors in polar co-ordinate form are summed by first converting them into electrical potentials representing the corresponding Cartesian co-ordinates, adding the respective Cartesian coordinate potentials and converting the resultant vector Cartesian co-ordinate potentials into an indication of the polar components. The magnitude OP of each vector, Figs. 3, 4, may be represented by a voltage OP tapped from an auto-transformer fed with a constant voltage V. The rotor R1 of a generator G1 is energized by OP, and is set according to the vector altitude angle e, thereby inducing in the quadrature stator windings voltages proportional to z and OR, Fig. 3. The voltage OR is fed to a further generator rotor R2 positioned according to the vector azimuth angle α and thereby induces voltages proportional to x, y in the quadrature stator windings of generator G2. Transmitter. In a practical application, Fig. 1, the twophase generators G1, G2 are for each vector replaced by the three - phase generator AS1, AS2, the outputs of which are converted to two-phase by Scott - connected transformer, T1, T2, T3, T4. Otherwise the co-ordinate conversion is the same as for Fig. 4, the range, altitude and azimuth of one vector represented, respectively, by the angular settings of the tapping of auto-transformer V1 and rotors 11, 12 of generators AS1, AS2 being translated into the Cartesian co-ordinate potentials x, y, z developed in the transformers T4, T3, T1. Similarly, Cartesian co-ordinate voltages may be developed across transformers T8, T6, T5 corresponding to a second vector, the polar co-ordinates of which are set up manually or otherwise at V2, AS3, AS4, and so on for further vectors. The x, y, z co-ordinate potentials of the various vectors are added respectively by serially connecting the secondaries of the output transformers over lines 103, 102, 101 to the receiver, Fig. 2. Receiver. The resultant x, y potentials fed over lines 103, 102 energize through Scottconnected transformers T11, T12 the threephase parallel connected stators of motors AS7, AS8. The rotor 113 of AS7 is set automatically to the resultant azimuth angle by a two-phase servomotor M1 and drives the azimuth indicator AZ. The rotor 114 of AS8 is secured in phase quadrature to the rotor 113 and energizes the transformer T10 corresponding to the x, y resultant. The transformer T9, energized from line 101 with the resultant z potential and T10 are Scott-connected to the three-phase motors AS5, AS6. The rotor 111 of AS5 is set automatically to the resultant altitude angle by a servomotor M2 and operates the altitude indicator ALT. The rotor 112 of AS6 rigid with but in quadrature to rotor 111 develops a voltage corresponding to the magnitude of the resultant of the x, y, z components which is balanced by means of a servomotor M3 against the voltage tapped off a mains supplied autotransformer V3, and indicated by a voltmeter V, graduated to read range or magnitude. Two-phase generators and motors may be used in which case the Scott-connected transformers are unnecessary. Specification 14246/94, [Class 38], is referred to.