Abstract: A high peak power microwave generator is disclosed in which a plurality of transmission lines are connected to an output wave guide at predetermined intervals along the direction of propagation. Each transmission line is periodically charged, and this electromagnetic energy is released into the wave guide upon the actuation of a light activated silicon switch (LASS) diode connected to the transmission line. The LASS diodes are actuated simultaneously by a laser beam which traverses equal optical paths to each switch. The coincident switching of the transmission lines enables the power in each line to be additive in the wave guide, and much higher output pulses can be obtained. Further, the high speed switching capabilities afforded by the LASS diodes means that the resulting high power can be obtained at a much higher frequency.

Abstract: An active filter is disclosed for providing improved notch and band pass filters. The output to input frequency response of an active filter is mathematically expressed as a ratio of two polynominals in the Laplace operator S. In any notch filter, the coefficient of the S term in the numerator must be reduced to zero, while in any band pass arrangement the coefficient of the S term in the denominator is reduced to zero. The improved notch filter provides an input circuit for the operational amplifier portion of the filter which eliminates the S term in the numerator so that adjustments to reduce this term are unnecessary. Similarly, in the improved band pass filter, the S term in the denominator is eliminated in the feedback circuit provided for the operational amplifier, so that adjustment is unnecessary to eliminate the coefficient of S.

Abstract: A speed control system is disclosed for a direct current motor drive energized by a thyristor armature supply. Voltage regulation for the thyristor supply is through a parallel current controller in which an armature current controller is arranged in parallel with positive and negative rate current controllers, the output of this parallel combination being applied as a voltage control signal to the thyristor supply through a parallel switch which mandates priority of control. Normally, the current controller will determine the thyristor armature supply voltage, but if the armature current rate exceeds a preset current rate reference, the parallel switch intercedes and the appropriate rate current controller takes over control of the thyristor supply voltage. When the thyristor armature supply current rate goes below the rate reference setting, the armature current controller will again resume control of the thyristor supply voltage.

Abstract: This disclosure relates to a timer for subdividing a finite time interval into a number of periods. An operational amplifier is connected as an integrator with a capacitor in its feedback path. An adjustable resistance network, enabling the selection of a fixed ohmic magnitude, is connected to the input of the operational amplifier and to a source of d.c. potential. A detector, connected to the output of the operational amplifier, determines when the capacitor has reached a fixed potential, by actuating a relay, the relay having normally open contacts in shunt with the capacitor, the closure of the contacts discharging the capacitor -- the charge-discharge cycle is then repeated. By selection of the ohmic magnitude for the resistance network, the operator can divide the time interval into equal periods in accordance with the number of times that the capacitor reaches the detected potential level.

Abstract: The disclosure relates to a manual control handle for an electrically powered utility vehicle. The handle provides three functions for the vehicle: steering guidance, speed selection and directional control (forward or reverse). These functions are so designed into the handle that the operator is able to use the handle to control the vehicle without training and with a high degree of safety.

Abstract: This disclosure relates to an electric arc furnace control system for positionally displacing the consumable furnace electrodes. Each electrode is coupled to an electric motor and arranged for vertical height displacement in relation to the material in the furnace. An arc current control signal is derived by comparing the actual arc current with a reference electrode arc current. In addition, a reactive power control signal is also derived by comparison of the (actual reactive power/actual real power) with a desired ratio of (reactive power/real power). The arc current control and the reactive power control signals are algebraically summed to provide an output error signal which is sent to the respective electric motors to provide rectilinear displacement of the electrodes.

Abstract: This disclosure relates to a parallel speed regulator system for a plurality of d.c. motors operated on a common bus having a single armature electrical supply. The speed control, current limiting, and field current controllers for each motor are arranged in parallel and connected to a resistor-diode switching network to provide a switching order of priority: (1) maximum and minimum field current controllers (2) armature current limit controllers and (3) speed controller. This parallel speed regulator system provides all the inherent advantages of the multiloop controller arrangement together with automatic adjustments which are a function of the instantaneous motor operating point, so that the dynamic response of the motor remains the same regardless of perturbations in the operating points.

Abstract: A stand speed reference circuit is disclosed for providing speed reference signals to each of a plurality of selected stands in a continuous tandem rolling mill.U.s. pat. No. 3,852,983 to Cook for "Work Strip Gauge Change During Rolling in a Tandem Rolling Mill" discloses a method for changing to a new gauge schedule without shutting down the mill, by using a precalculated multiplier to successively and progressively change the mill stand speeds of all the stands save the pivot stand, the speed of which remains constant at the previously scheduled rate. Interstand tension regulators between the stands automatically change the delivery gauge at the stand of entry of the gauge change point of the moving strip.The present disclosure provides an analog stand speed reference circuit to realize the Cook teaching without disturbing the mill by introducing spurious interstand tensions.

Abstract: A system for sensing the air gap between a cutting tool and a work piece mounted on a machine for the purpose of controlling the traverse feed rate of the machine as contiguity approaches. A drive coil is mounted on the machine. A search coil surrounds the cutting tool in proximity to the air gap and is mutually coupled (M.sub.1) to the drive coil. A mutual inductor has first and second coils arranged so that their mutual inductance M.sub.2 is variable; these coils are connected in common at one end to a variable inductionless resistor r. The first coil is connected series aiding with the drive coil, while the second coil is connected in series opposition with the search coil. An a.c. source is connected across the drive coil, first coil and inductionless resistor. The induced voltage across the series combination of search coil, second coil, and inductionless resistor provides an output which is initially nulled by adjusting M.sub.2 and r for a selected datum displacement between cutting tool and work piece.

Abstract: A motor field control for d.c. drives, for regulating the speed in response to an input reference signal E.sub.in. A first operational amplifier is arranged as a ramp generator to receive the input command E.sub.in and deliver an output E.sub.1, having a maximum magnitude equal to E.sub.F. A potentiometer having a sliding contact is connected in the output of the first operational amplifier, the potential of the sliding contact with respect to ground defining an attenuation potential -.alpha.E.sub.1. The factor .alpha. is adjustable between O . . . n to include both fractional as well as whole numbered values. A second operational amplifier is arranged to sum three inputs: -E.sub.F, E.sub.in and -.alpha.E.sub.1 and deliver an output E.sub.2 for controlling the field flux beyond base speed.E.sub.2 = E.sub.F - E.sub.in +.alpha.E.sub.1the simple selection of the magnitude for the attenuation factor .alpha. determines the crossover point between armature voltage control and field flux control for the d.c. motor.

Abstract: An analog automatic slowdown control system is described for determining the optimum instant of time to initiate slowdown, for a process line in which a coil of material is being unwound from a mandrel at a linear speed. Using the intelligence derived from the linear speed and the speed of the unwind reel, signals are derived for: the instantaneous diameter, the desired remaining portion of the diameter after stopping, and the change in diameter during deceleration. These three signals are algebraically summed with a signal which is a function of the mandrel diameter, and when the summation is zero, slowdown is initiated.

Abstract: A speed control system is disclosed for driving a motor at .omega. radians per second for the purpose of rolling material in a hollow cylindrical form with preselected outside and inside diameter OD and ID respectively. The material to be rolled is fed to the coiler at a linear speed s. An integrator having dual polarity inputs delivers an output .omega./s. A detector has inputs connected to receive a signal which is a function of the preselected diameters OD and ID respectively and the integrated output .omega./s, and an output connected to the dual polarity integrator inputs for selectively and successively activating one of the dual inputs for determining the direction of integration. A multiplier receives the integrated output and delivers multiplied products .omega..sup.2 /s .sup.2 .omega..sup.3 /s.sup.2, .omega..sup.4 /s.sup.2. A signal shaper receives these multiplied products and delivers new products a.omega..sup.2 /s.sup.2, b.omega..sup.3 /s.sup.2, and c.omega..sup.4 /s.sup.

Abstract: A vector conversion system for a numerical contouring control having a programmed machine path with at least two axial displacements .DELTA.X,.DELTA.Y, with a given cutter radius RCRAD. Master vector and slave vector computers are provided and arranged to operate in rotation and multiplication modes. The master vector computer receives signals which are a function of .DELTA.X and .DELTA.Y and delivers a counter rotational control signal and an RSS signal where RSS = .sqroot..DELTA.X.sup.2 + .DELTA.Y.sup.2. The slave vector computer receives the counter rotational control signal, a "0" signal and a signal which is a function of RCRAD, and delivers output signals IRC and JRC which are the orthogonal components of RCRAD. When these components IRC and JRC are interchanged, in effect, vector RCRAD is normal to the programmed machine path.