Abstract: The dynamic instabilities in a system which controls prime mover output torque and angular velocity separately are avoided by deriving an accelerating torque signal in an output torque controller where it is added to a sensed torque signal, and the added signal is compared to a commanded torque signal, the difference signal value therebetween serving to control the output torque.

Abstract: A high efficiency MOSFET sine wave generator is provided using the class D pulse width modulation principle. A triangle wave at f.sub.0 is compared to a variable amplitude sinusoid at about 1/10 f.sub.0 to provide a pulse width modulated signal for driving a pair of power MOSFETS connected for switching a B+ and a B- power supply. The power switch output is LC filtered and fedback for regulating the amplitude of the modulating sinusoid.

Abstract: A dry lube level sensor for use in a verbal annunciation system for monitoring a wire fabrication process comprises a sealed float tube having a magnetic float for actuating a reed switch within an adapter which connects the float tube to a mounting base for providing a low level signal to the alarm system.

Abstract: An interface for use between an asynchronous bus and a signal processor is disclosed. The interface utilizes a wraparound receive memory to ensure coherency with very little processor overhead.

Abstract: A wire tangle sensor is disclosed for sensing tangled wire in a wire fabrication process prior to being fed into a wire drawing machine so that a tangled wire signal may be sent to a verbal annunciator. A verbal announcement of a tangled wire condition is made for immediate corrective action by maintenance personnel to avoid a production shutdown. The wire tangle sensor comprises a metallic probe positioned in close proximity to a moving wire which touches the wire when it becomes tangled thereby grounding the probe and providing a current path for a switch which initiates the verbal announcement.

Abstract: A differential torquer servo loop having means for comparing the balance between a torquer position related signal and a signal indicative of the difference in the magnitudes of the currents in the differential torquer and for rebalancing any difference therebetween is disclosed. Total current in the torquer is maintained at a constant level to provide a quiet control loop which promotes temperature stabilization.

Abstract: A coherent interface between one or more asynchronous busses and one or more channels in which only one channel is permitted to communicate with a bus at a time is disclosed.

Abstract: A method and apparatus for reducing unnecessary elevator service calls by cycling open and shut a nonresponsive car's door, is disclosed. The doors are cycled in the presence of car demand and indications the car door is shut but the hoistway door is ajar. The doors are cycled only after these conditions persist for a selected period.

Abstract: An interface for use between an asynchronous bus and a signal processor is disclosed. The interface utilizes both a wraparound receive and transmit memory to ensure coherency with very little processor overhead.

Abstract: A plurality of different types of operating systems in buildings organized in geographical groups, each group having a local service office, are monitored at both the local offices and central office for the presence of performance conditions and conditions indicative of an alarm condition.

Abstract: A three-terminal series regulator achieves high efficiency by using an enhancement mode P-channel or N-channel FET for the series regulating element, respectively, for positive or negative voltage regulation thereby eliminating the need for a boost voltage and also minimizing the input-to-output voltage differential at high power levels. Short circuit protection is provided using output voltage and current foldback.

Abstract: A slitter is disclosed for slitting a cable-like item longitudinally to a controlled depth with a blade. The cable-like item is drawn through a guide which is shaped to correspond to the cross-section of the item, thereby ensuring proper twist as the item is drawn under the slitter blade.

Abstract: A position control system having dual controllers, each capable of operating in either a proportional or a proportional plus integral gain mode, is normally operated with one controller in the proportional plus integral mode and the other in the proportional mode, each controller contributing its proportionate part of the output position control signal to the position controlled device, and each controller capable of operating alone in the proportional plus integral mode in the event of a failure.

Abstract: The directions of travel of an inner and an outer loop actuator are monitored for movement in opposite directions within selected ranges and the outer loop actuator is disabled under selected conditions. These conditions may include movement of both the inner and outer loop actuators in opposite directions, any one of which has been detected moving at a rate greater than a selected rate or to a position outside a selected range. The invention is particularly suited for an aircraft trim actuator shutdown monitor system.

Abstract: A light-off detector for an afterburner of a gas turbine jet engine comprises an afterburner flameholder (24) electrically insulated (70) from an attached igniter (38) and insulated from other engine parts by means of non-electrically-conductive support rods (30, 45) or by means of electrically conductive rods (30) insulated (50, 52) from the engine case (12) and insulated (70) from an attached igniter (38). An electrical connection (54) brought through the engine case connects the flameholder to a resistor (57) through a bias battery (56). Ionic current flow resulting from flame causes a Schmidt trigger (60) to provide a light-off signal, A/B LIT (62).

Abstract: A device for removing and inserting an IC chip from its installation.

Abstract: The accuracy of a fluid jet angular velocity sensor is increased by reducing flow disturbances which tend to increase the device's temperature sensitivity.

Abstract: The present invention relates to a sensor for sensing orthogonal components of angular velocity of rotation of the sensor about any axis in a plane perpendicular to a reference jet axis within the sensor, wherein a fluid jet is deflected relative to two pairs of electrically resistive, temperature sensitive elements in response to rotation of the sensor, wherein each pair of elements forms the sensing branch of a bridge circuit, the jet deflection causing differential cooling and bridge unbalance which is an indication of the deflection of the fluid jet from the reference jet axis which is in turn an indication of the rate and direction of angular rotation, wherein each pair of elements is disposed in a plane perpendicular to the reference jet axis, each pair sensing an orthogonal component of angular velocity of rotation.

Abstract: A current-limited MOSFET switch is achieved using a zener diode connected from the gate to source of the MOSFET.

Abstract: A highly accurate signal conditioning circuit for use with a linear/rotary variable differential transformer (L/R VDT) operating in a unipolar mode is disclosed. The circuit may be utilized for ratiometric comparison of L/R VDT primary coil peak excitation and L/R VDT secondary coil peak response. Unique peak detectors are used for detecting both primary and secondary peak values. The circuit may include an oscillator having R and C elements in a tank circuit which also includes the L/R VDT primary coil. Offset errors may be determined externally by providing for a momentary shutdown of the oscillator to permit the measurement of DC components to the signal conditioner and excitation DC outputs, by external means.