| Patent Number |
Title Of Patent |
Date Issued |
| 5059884 |
Variable reluctance motor providing holding torque |
October 22, 1991 |
| A variable reluctance motor (10, 100, 200) for providing holding torque in accordance with the invention includes a magnetically permeable rotor (12); a stator (18) axially aligned with the rotor having at least one phase winding (22) for producing a magnetic field causing the rotor to |
| 5059226 |
Centrifugal two-phase flow distributor |
October 22, 1991 |
| A static, centrifugal two-phase distributor (20) is constructed to distribute two-phase refrigerant equally on a mass basis to conduits (37) of evaporator circuits. The distributor (20) has an upper section (21) defining a swirl chamber (23) with a tangentially arranged inlet (28) and |
| 5058390 |
Aircraft vapor cycle cooling system with two speed control of a condenser fan and method of oper |
October 22, 1991 |
| A vapor cycle cooling system (10) in accordance with the invention includes a compressor (12) for compressing refrigerant vapor; a condenser (14) receiving compressed refrigerant vapor from the compressor; a fan (18) having at least two controllable speeds for blowing a fluid (16) in |
| 5058375 |
Gas turbine annular combustor with radial dilution air injection |
October 22, 1991 |
| An annular combustor having radial dilution air injection in a gas turbine is disclosed. The gas turbine includes a rotor having turbine blades and a nozzle adjacent the turbine blades which is adapted to direct hot gases at the turbine blades to cause rotation of the rotor. The annular |
| 5057808 |
Transformer with voltage balancing tertiary winding |
October 15, 1991 |
| A summing transformer includes first and second sets of primary windings, first and second sets of secondary windings inductively linked with the first and second sets of primary windings and a set of tertiary windings inductively linked with one of the first and second sets of secondary |
| 5056123 |
Frequency counter with round off function |
October 8, 1991 |
| The frequency of the signal is determined by counting the period of the signal. A round-off circuit increments the count if the end of the signal occurs after the midpoint between counts. |
| 5055992 |
Control for full-bridge inverter |
October 8, 1991 |
| An inverter control for a full-bridge inverter having a plurality of phase legs each of which includes a switch which is operated to produce one of a set of phase output voltages and wherein a neutral voltage is derived from the phase output voltages compares each phase output voltage to |
| 5055765 |
Voltage regulator for direct current aircraft power bus |
October 8, 1991 |
| A voltage regulator for an aircraft d.c. power supply in which the gain of the voltage regulator varies as a function of d.c. load current and a.c. generator speed. In addition, in a preferred embodiment of the invention, low noise lead compensation is provided by a network which models |
| 5055764 |
Low voltage aircraft engine starting system |
October 8, 1991 |
| In a system for starting an aircraft turbine from a low voltage direct current power supply, the low voltage power supply is coupled by an invertor to the turbine's a.c. generator. The generator operates as a motor during starting. The invertor is initially coupled directly to the ge |
| 5055722 |
Gate drive for insulated gate device |
October 8, 1991 |
| A circuit providing improved noise immunity for a first transistor including power terminals and a gate, the power terminals being connected to a power supply and to a load, and the gate being connected to receive control pulses from a pulse source for turning the first transistor on and |
| 5055014 |
Fluid supply conduit |
October 8, 1991 |
| Prior fuel supply conduits for use in applications where fluid flow must diffuse and turn a sharp bend have suffered from reduced two-phase flow capability, cavitation on the walls of the conduit, head loss and unsteady flow patterns. In order to overcome these problems, a fuel supply co |
| 5054592 |
Manual/powered operation safety device |
October 8, 1991 |
| A safety device for a drive unit adapted for manual and powered driven movement of a drive shaft. The safety device includes a brake operably associated with the drive shaft for preventing manual and powered driven movement of the drive shaft. It also includes a manual input for releasin |
| 5054583 |
Bearing arrangement with centrifugal mist lubrication flow and isolate dead shaft conductive coo |
October 8, 1991 |
| A cooling and lubricating system for use with a bearing assembly comprises a bearing having inner and outer races with interposed bearing elements, a rotary element requiring lubrication journaled for rotation by the bearing, an axially extending hollow shaft in heat exchange relation wi |
| 5054284 |
Combustion heated air turbine starter system |
October 8, 1991 |
| In order to enhance the effectiveness of an air turbine starter 12, an auxiliary or emergency power unit 16 is adapted to deliver air through a bleed duct 18. This bleed duct 18 is in communication with the air turbine starter 12 which, in turn, is operatively associated with a main turb |
| 5054283 |
Turbine engine impingement assembly |
October 8, 1991 |
| In order to rapidly start turbine engines in a manner eliminating resort to complex mechanical components, an auxiliary impingement assembly is disclosed. The turbine engine will typically have a turbine rotor with impeller blades integral therewith. It will also include a combustor for |
| 5053939 |
Control of PWM inverters by pattern development from stored constants relating D.C. link harmoni |
October 1, 1991 |
| A pulse-width-modulated inverter in which equations relating switching angles, d.c. link distortion and a.c. inverter output distortion are determined empirically or by computer modeling. The amplitude of a d.c. link harmonic is the equation variable and stored constants particularize |
| 5053688 |
Feedback circuit for eliminating DC offset in drive current of an AC motor |
October 1, 1991 |
| A motor control (10) for a motor (12) powered by an AC pulse source which applies current pulses to stator windings of the motor to cause rotation of the motor in accordance with the invention includes a current sensor (18) for sensing a DC net current in the current pulses flowing to th |
| 5053358 |
Method of manufacturing hermetically sealed compression bonded circuit assemblies |
October 1, 1991 |
| A method of manufacturing hermetically sealed circuit assemblies (10) having circuit elements (74, 76, 78 and 80) to be compression bonded, a hermetically sealed circuit assembly having circuit elements to be compression bonded and a stack containing at least one hermetically sealed |
| 5052537 |
Rotary travel limit stop apparatus |
October 1, 1991 |
| A rotary travel limit stop apparatus having a first rotary member (10) and second and third independently rotatable members (14 and 20) having slightly different numbers of gear teeth which engage the gear teeth on a first member (10) carry a movable stop pin (30) which is adapted to eng |
| 5052518 |
Lubrication system for overrunning clutches |
October 1, 1991 |
| A lubricating system for an overrunning sprag clutch assembly (1) interposed between a rotatable drive (18) and a driven member (10). A lubricating fluid is supplied to the clutch assembly (1) and a lubricating dam (11) is formed on respective axial sides of the clutch assembly (1) t |
| 5051680 |
Simple starting sequence for variable reluctance motors without rotor position sensor |
September 24, 1991 |
| A rotor position sensing system (10) for a variable reluctance motor having a plurality of phases .PHI..sub.1 -.PHI..sub.3 with each phase having a phase winding wound on stator poles (18, 20 and 22) and first and second switches (Q.sub.1 and Q.sub.2, Q.sub.3 and Q.sub.4, and Q.sub.5 and |
| 5050389 |
Refrigeration system with oiless compressor supported by hydrodynamic bearings with multiple ope |
September 24, 1991 |
| A refrigeration system (10) having a compressor rotor (20) rotatably supported by a plurality of hydrodynamic bearings (22 and 24) lubricated by oiless pressurized liquid refrigerant and pressurizing refrigerant which flows to a condenser (34) providing liquid refrigerant which flows |
| 5049799 |
High performance controller for variable displacement hydraulic motors |
September 17, 1991 |
| In a control (100) for a variable displacement hydraulic motor (12) having an electrically controlled hydraulic servo valve (14) for controlling the displacement of a hydraulic motor by varying position of a wobbler (28) in response to a servo valve control signal, a velocity transducer |
| 5049342 |
Method of fabricating composite structures |
September 17, 1991 |
| A method of fabricating a composite structure having at least one skin molecularly bonded to a core. A skin is provided of reinforcing fibrous material and a thermoplastic matrix. The skin is thermoformed to the general exterior shape of the composite structure. A core having a therm |
| 5048298 |
Low cost fuel system for a gas turbine engine |
September 17, 1991 |
| The high cost of the fuel injection system in a gas turbine engine can be reduced by utilizing a low cost jet or nozzle (70) to spray fuel into the inlet (24) of a compressor (18). The resulting air-fuel mixture flows as a semi-discrete sector to a combustor (58) to be swirled therein an |
| 5047914 |
Current controlled inverter |
September 10, 1991 |
| An inverter (100) in accordance with the present invention for producing an AC output potential from a filter (40) containing an inductance (42) through which current flows to a load (12) in accordance with the invention includes first and second switches (Q1 and Q2) in series between |
| 5047699 |
VSCF start system motor current estimator |
September 10, 1991 |
| The problem of excess size and weight resulting from the use of current sensors in a VSCF start system (10) is solved by a motor control (22) which utilizes a current estimator (68) to develop a current feedback value. The current estimator (68) is coupled to a rotor position detector |
| 5045991 |
Unity power factor AC/DC converter |
September 3, 1991 |
| A control for an AC/DC power converter having first and second switches and which converts an AC voltage supplied by an AC source into a DC voltage on a DC output conductor includes circuitry for developing an error signal representing the deviation of the DC voltage from a desired level |
| 5045734 |
High power switch |
September 3, 1991 |
| A power switch responsive to drive signals developed by a signal source includes driver and driven transistors connected in a Darlington configuration and a further transistor having a control electrode and first and second main current path electrodes wherein the first main current |
| 5044167 |
Vapor cycle cooling system having a compressor rotor supported with hydrodynamic compressor bear |
September 3, 1991 |
| A refrigeration system (300) having a compressor (12) with a rotor (20) rotatably supported by a plurality of hydrodynamic bearings (22, 24) lubricated by oiless pressurized liquid refrigerant and pressurizing refrigerant which flows to a condenser (34) providing liquid refrigerant w |
| 5043911 |
Multiplexing A/D converter for a generator control unit |
August 27, 1991 |
| A "reversible master/slave" handshaking protocol is disclosed for addressing the problem of interfacing a multiplexing analog-to-digital (A/D) converter, having a first operating rate, to a microprocessor, having a second operating rate. In the specific embodiment of a generator cont |
| 5043857 |
Real-time control of PWM inverters by pattern development from stored constants |
August 27, 1991 |
| In a real time control of a pulse width modulated inverter, equations are developed relating switching angle, system parameter or parameters and output harmonics. Constants are stored which define a preferred angle for each switching event. Switching angles are calculated in real time by |
| 5043653 |
Noise filter for zero crossing detector |
August 27, 1991 |
| A noise filter for the zero crossing detector of a digitized sine wave signal uses an adjustable noise integrator. The noise integrator incorporates a counter. The integration characteristic of the counter is adjustable by selecting a count rate or a count limit from a microprocessor |
| 5042970 |
Fast recharge compressor |
August 27, 1991 |
| Time lost in recharging compressed gas storage bottles on board aircraft is minimized with a fast recharge compressor (20) for rapidly providing compressed gas (30) having a housing (24) with a gas inlet (26), a shaft (46) within the housing (24) on which is mounted a turbine (34) and a |
| 5042749 |
Mechanism for limiting rotation of a rotatably mounted shaft |
August 27, 1991 |
| A mechanism (10) for limiting rotation of a rotatably mounted first shaft (12) in accordance with the invention includes a housing (28) in which the first shaft is rotatably supported; a torque input (14) coupled to the first shaft; and a torque output (18) coupled to the first shaft; a |
| 5042630 |
Constant speed drive gear motor differential |
August 27, 1991 |
| A constant speed drive differential assembly (10) has an input end plate (11), a rotatable housing (17), and an output end plate (18). A gear motor (12) comprising meshing spur gears (13, 14) mounted on shafts (15, 16) are arranged in the housing (17). A driving gear (20) is fixed to one |
| 5041958 |
Stepped-waveform inverter with four subinverters |
August 20, 1991 |
| An inverter for use in a power conversion system of the type used in an aircraft, for example, includes a first subinverter pair that generates a first pair of waveforms and a second subinverter pair that generates a second pair of waveforms. The two subinverter pairs are connected to a |
| 5041957 |
Stepped-waveform inverter with six subinverters |
August 20, 1991 |
| An inverter for use in a power conversion system of the type used in an aircraft, for example, includes a first subinverter pair that generates a first pair of waveforms, a second subinverter pair that generates a second pair of waveforms, and a third subinverter pair that generates a th |
| 5041748 |
Lightweight, direct drive electromechanical actuator |
August 20, 1991 |
| An actuator (10) comprises a housing having sections (11, 11') joined by a band clamp (12). A high torque, low speed motor (14) is provided in the housing and has a rotor (17) associated with a ballscrew rod (18) which is received in the hollow end of a ballnut/rod (20). The ballscrew ro |
| 5041707 |
Electromagnetic interference shielded switch |
August 20, 1991 |
| A switch assembly (60) shielded against electromagnetic interference in accordance with the present invention includes a first housing (15) defining a volume within which a switch (16) is disposed and a first opening not providing shielding against electromagnetic interference penetr |
| 5040654 |
Manual connect-disconnect coupling |
August 20, 1991 |
| Difficulties in interrupting a mechanical power transmission path may be minimized in a manual connect-disconnect operator which includes a coupling shaft (38) and a translatable carrier (28) journalling the coupling shaft (38) for rotation about an axis and mounting the coupling sha |
| 5040643 |
Radial torque limiter |
August 20, 1991 |
| A radial torque limiter, for example, for a geared rotary actuator (1, 1') including input member (S, 8) coupled to an output member (3 or 3') driving a sun gear (4) and planet gears (5) through axially projecting tabs (3g). Roller elements (2) are arranged at ramp sections (3a, 3b, 3c, |
| 5040371 |
Fuel injectors for use with combustors |
August 20, 1991 |
| The high cost of fuel injectors for use in small scale environments is avoided in a fuel injection nozzle structure including a simple tube 10 used as a fuel injecting tube and having a fuel injecting end 12 received in a reduced diameter outlet 18 from an axial air flow chamber 20 c |
| 5040105 |
Stepped-waveform inverter with eight subinverters |
August 13, 1991 |
| An inverter for use in a variable-speed, constant-frequency power conversion system of the type used in an aircraft, for example, includes a four subinverter pairs, each of which generates a respective set of waveforms. The four subinverter pairs are connected to a summing transforme |
| 5040051 |
Hydrostatic clamp and method for compression type power semiconductors |
August 13, 1991 |
| Hydrostatic clamping devices (20, 40) are provided to exert uniform pressure across the faces of components such as wafers (22) to constitute an integrated electronics package or power bar. The devices (20, 40) use the principle of hydrostatic pressure in a bladder (28, 41, 42) to provid |
| 5039932 |
Integrated variable reluctance generator for air frames |
August 13, 1991 |
| An alternating current generating system (40) for an air frame producing an output potential in accordance with the invention includes a generator (42) for generating current having a rotor (46) mounted on a shaft (50) which is rotatably driven and a stator (58) from which current is |
| 5038857 |
Method of diffusion bonding and laminated heat exchanger formed thereby |
August 13, 1991 |
| Leakage of fluid from a heat exchanger and fluid mixing in the case of a two fluid compact high intensity cooling heat exchanger are prevented by diffusion bonded areas of the heat exchanger formed using small locally raised borders which extend about the fluid passage or passages of the |
| 5038095 |
Control for a DC link power conversion system |
August 6, 1991 |
| A control for a DC link power conversion system including a brushless generator having a main generator portion including an armature winding and a rectifier coupled to the armature winding of the main generator portion which converts AC power developed therein into DC power on a DC |
| 5038094 |
Reference trimming for a digital voltage regulator |
August 6, 1991 |
| The problem of adusting a digital reference value without modifying a program or stored memory values in a voltage regulator (60) is minimized using an analog signal generator (114). A reference loop (110) which determines a desired point of regulation voltage level receives a trim v |
| 5036659 |
Swash plate type pump with flow path through cavity containing swash plate |
August 6, 1991 |
| Overheating of hydraulic fluid in a hydraulic motor system subject to aiding loads can be avoided without paying a weight or volume penalty by providing a return port (64) adapted to be connected to the system return (22) in fluid communication with a cavity (46) within an hydraulic moto |
