| Patent Number |
Title Of Patent |
Date Issued |
| RE34962 |
Annular combustor with tangential cooling air injection |
June 13, 1995 |
| The combustion dynamics and efficiency of gas turbine having an annular combustor 26 provided with fuel injection nozzles 50 that inject fuel generally tangentially is improved by providing the walls 32, 34, 39 of the combustion 26 with cooling air film injectors 70, 86; 72, 88; 74, 90 |
| RE33378 |
Incremental base drive circuit for a power transistor |
October 9, 1990 |
| A base drive circuit for a power transistor includes a plurality of discrete current sources. A condition of the power transistor circuit, which is a function of the transistor current, is sensed and controls the number of discrete current sources that are activated. |
| RE30525 |
Extended range hydraulic transmission |
February 24, 1981 |
| .Badd.A power train includes an input means and an output means, the output means being operatively connected with a speed differential gear means. A first drive transmitting means including hydraulic transmission means is connected between the input means and the gear means. A second dr |
| RE30226 |
Torque limiting control |
March 11, 1980 |
| A torque limiting control for a pair of variable displacement hydraulic pumps having displacement varying means and servo means including springs urging each of the displacement varying means to a position for maximum pump displacement and fluid operated means acting in opposition to the |
| RE29292 |
Control valve means for fluid motors |
July 5, 1977 |
| A pressure reducing valve mechanism maintains pressure in one of the service passages of a control valve at a desirably low value except at times when the control valve element is actuated to a position effecting flow of pressurized supply fluid to said service passage for delivery to a |
| 6291878 |
Package for multiple high power electrical components |
September 18, 2001 |
| A semiconductor package includes a plurality of semiconductor devices disposed in an array surrounding a central electrode structure carried by a package support member. The package is capable of withstanding high voltages and currents and includes a heat exchanger integral therewith. |
| 6196361 |
Compact electric asymmetry brake |
March 6, 2001 |
| An improved braking apparatus having a jaw type clutch coupled to an electrical solenoid through a ball spline mechanism provides significantly greater braking capacity in a given volume than other types of braking devices. The ball spline is configured to significantly reduce the in |
| 6152215 |
High intensity cooler |
November 28, 2000 |
| A high intensity cooling device is disclosed. The cooling device includes first and second superimposed laminations, with each of the laminations including a cavity having a spiral fin defining a spiral flow chamber. One of the flow chambers directs a coolant medium along an inwardly spi |
| 6141219 |
Modular power electronics die having integrated cooling apparatus |
October 31, 2000 |
| A power electronics device incorporating a modular packaging concept and having an integrated device cooler is disclosed. A modular power electronics die cooler is designed for use with a coolant manifold adapted to circulate a coolant medium past a mounting receptacle. The modular p |
| 6118362 |
Integrated inductive assembly |
September 12, 2000 |
| An integrated inductive assembly includes first and second inductive elements each comprising a winding wherein winding axes of the windings are perpendicular to one another. In addition, the first and second inductive elements are carried adjacent one another by a bracket. |
| 6059537 |
Aircraft fuel pump with centrifugal pump and regenerative pump stages |
May 9, 2000 |
| A fuel pressurization and pumping system for use in a turbine powered aircraft or the like makes use of the advantages of centrifugal pumps, even in a high pressure mode and includes a centrifugal volute pump (24) having a fuel inlet (28) and fuel outlet (32) along with a regenerative |
| 6057619 |
Stress relief in a magnetic thrust bearing |
May 2, 2000 |
| Undesirably high stresses are minimized in a magnetic thrust bearing (15) having a disc (52) mounted on a shaft (54). The disc (52) is flanked on both sides (60,62) by respective armatures (68,70) which act to apply a magnetic field to the disc (52) to locate the same at a desired locati |
| 6022197 |
Aircraft pump system with internal pressure control, comprising a regenerative pump and a centri |
February 8, 2000 |
| Difficulties in adapting centrifugal pumps for use as fuel pumps for turbine powered aircraft are avoided in a system including a centrifugal volute pump (22) on a common shaft (18) with a regenerative pump (24). A pressure responsive throttling valve (46) is connected to the inlet (50) |
| 6018233 |
Redundant starting/generating system |
January 25, 2000 |
| A power conversion system allows for redundant starting and generating functions and eliminates equipment normally found in a conventional system so that size and weight are reduced. |
| 6016739 |
Piston and method for reducing wear |
January 25, 2000 |
| This invention relates to a piston for reciprocating and simultaneously rotating through a predetermined length of movement within a piston bore having a piston bore surface, and a method for reducing wear on a piston bore surface operatively associated with a piston which is subject to |
| 6008558 |
L-shaped magnetic thrust bearing |
December 28, 1999 |
| An electromagnetic thrust bearing having reduced windage losses, improved structural integrity, and enhanced electromagnetic flux density. The present invention provides an electromagnetic thrust bearing having a first annular stator segment and a second annular stator segment joined |
| 6007311 |
High speed self-lubricated fuel pump with hydrostatic bearings |
December 28, 1999 |
| The weight and volume of a centrifugal fuel pump ideally suited for use in a fuel system for a turbine engine (12) may be reduced in a construction including a single shaft (10) mounting an inducing impeller (18), an impeller (22) for a regenerative pump, and an impeller (24) for a c |
| 6006776 |
Integrated drive generator recirculation valve with feedback control |
December 28, 1999 |
| A fluid circulation system in accordance with the invention includes a first fluid utilizing device (12) requiring a minimum fluid flow having an input (14) for receiving the minimum flow and an output (16) for discharging fluid received from the input; a second fluid utilizing device |
| 5994804 |
Air cooled dynamoelectric machine |
November 30, 1999 |
| The hydraulic components of a cooling circuit for a dynamoelectric machine are eliminated in a totally air cooled dynamoelectric machine which includes a rotor (12) rotatable about an axis (14) and including a central stack (20) of ferrous laminations (22) defining a plurality of radiall |
| 5986366 |
Rotor for a dynamoelectric machine |
November 16, 1999 |
| A rotor (10) is provided for a dynamoelectric machine. The rotor (10) includes a rotor shaft (12) and a laminated core (14). The rotor shaft (12) is adapted to mount the rotor (10) for rotation about an axis (13) of rotation in a dynamoelectric machine. The laminated core (14) includes a |
| 5977648 |
Hydraulically driven low reactance, large air gap permanent magnet generator and voltage regulat |
November 2, 1999 |
| An electric power generating system comprises a low reactance, large airgap permanent magnet generator driven by a hydraulic motor to generate a poly-phase AC output voltage. Because the permanent magnet generator is a low reluctance, large airgap machine, the output voltage regulation i |
| 5977645 |
Aircraft secondary power system |
November 2, 1999 |
| A secondary power system for an aircraft utilizes a variable frequency electrical distribution system that provides power to one or more loads that can tolerate distortion components. In addition, a DC distribution system is coupled to the variable frequency distribution system and is |
| 5971798 |
Quick release power connector |
October 26, 1999 |
| An electrical power connection module adapted to indicate when a weld between a pin and a socket has occurred. The present invention provides a multiple pin plug wherein each pin mounted in the plug is attached thereto using a spring means. The biasing means is adapted to maintain the pi |
| 5969452 |
Magnetic bearing construction |
October 19, 1999 |
| A magnetic bearing (10) is provided for supporting a rotor (12) for rotation about an axis (14). The magnetic bearing (10) includes a plurality of actuator cores (16) spaced circumferentially about the axis (14), and a plurality of non-magnetic spacers (18A, 18B). Each of the cores ( |
| 5956960 |
Multiple mode environmental control system for pressurized aircraft cabin |
September 28, 1999 |
| The need for engine bleed air in a cabin pressurizing/ventilation ECS system for aircraft is avoided in a construction including a pressurizable aircraft cabin (10) having a cabin air inlet (20) and a cabin air outlet (22). The system includes a ram air inlet (34) and an aircraft exhaust |
| 5953220 |
System and method for zero phase error tracking of reference in PWM inverters |
September 14, 1999 |
| In an inverting system, a reference V.sub.REF is coupled to an input of a predictor. The predictor has an output V.sub.P and a transfer function T.sub.P. An inverter of the inverting system has a pulse width modulator, a filter, and a transfer function T.sub.I. The transfer function T.su |
| 5950774 |
Load limiter |
September 14, 1999 |
| A load limiter for preventing stall torque from being transmitted from a power drive unit to the flight control surfaces of an aircraft. The present invention provides such a load limiter in a package having lower weight and smaller spacial requirements than has been heretofore possible. |
| 5950714 |
Cooling apparatus for an electronic component |
September 14, 1999 |
| This invention relates to a cooling apparatus for at least one electronic component. The cooling apparatus includes a first member which has an inner surface and an outer surface. The outer surface of the first member is adapted for mounting the electronic component thereon at a preselec |
| 5943942 |
Copper-based alloy casting process |
August 31, 1999 |
| A cost-effective process for providing a copper-based alloy casting, which has superior wear characteristics, to a cylinder block is described. The process includes providing a negative pressure around the cylinder block and a copper-based alloy. The process further includes heating the |
| 5936386 |
Method of linearizing the performance of switched reluctance generators |
August 10, 1999 |
| A method of linearizing the output performance of a switched reluctance generator, comprises the steps of exciting the switched reluctance generator during a first phase of operation at a turn-on angle which need not be accurately calculated to produce the desired excitation current. |
| 5930134 |
Starting system for a prime mover |
July 27, 1999 |
| A starting system for a prime mover coupled to a generator includes a step-up inverter which converts DC power at a first voltage into AC power at a second, higher voltage. Halfwave pulses in the AC power are selectively applied to the generator by a pulse-population inverter coupled |
| 5929537 |
PMG main engine starter/generator system |
July 27, 1999 |
| A starting/generating system for a small aircraft having engines which can be battery started includes a permanent magnet generator (PMG) which can directly supply frequency-insensitive loads and a power converter for developing regulated DC power from the output of the PMG. |
| 5927066 |
Turbine including a stored energy combustor |
July 27, 1999 |
| In a gas turbine engine having gaseous oxidant delivered to a turbine from a source such as a pressurized bottle via a conduit or duct, a compact annular combustor is provided which offers enhanced performance through incorporation of means for uniformly distributing portions of the oxid |
| 5925481 |
Thermally activated electrical cell |
July 20, 1999 |
| A thermal battery (10) includes a heat source (16) fabricated from a combination of metallic lithium and a predominantly fluorine substituted hydrocarbon (PFSH) material. In some embodiments the thermal battery (10) includes a combination anode/heat source (62) fabricated from metallic |
| 5920175 |
Instantaneous position indicating apparatus for a sensorless switched reluctance machine system |
July 6, 1999 |
| A sensorless control for operating an inverter coupled to a switched reluctance machine includes an instantaneous position generation circuit that develops a signal for controlling commutation of the switched reluctance machine. The instantaneous position generation circuit includes |
| 5920162 |
Position control using variable exciter feed through |
July 6, 1999 |
| A motor generator system in accordance with the invention includes a prime mover (21) for driving an output shaft (18); a main motor generator (16, 105), having a rotor driven by the output shaft, for producing electrical power on a plurality of stator phase windings (36a-36c) in respons |
| 5918836 |
Aircraft spoiler blow-down mechanism |
July 6, 1999 |
| An electrical mechanical blow-down mechanism for use with an aircraft spoiler avoids possible damage due to high inertial loading when a power failure occurs as the spoiler (10) is moving toward or is at an extended position by means of a structure including a ball screw mechanism (18) |
| 5917401 |
Conductive bus member and method of fabricating same |
June 29, 1999 |
| A conductive bus member operable over a selected operating frequency range includes a cylindrical main body and first and second legs secured to the main body at first and second points whereby first and second current paths having first and second impedances are defined between the firs |
| 5911788 |
Compliant gear |
June 15, 1999 |
| A radially compliant gear is provided to reduce transmitted shock loads and/or resist jamming as a result of debris entering its mesh with another gear. The radially compliant gear includes a hub adapted to rotate about an axis, and a compliant rim. The hub includes a first surface that |
| 5911388 |
Environmental control system with energy recovery and bleed air assist |
June 15, 1999 |
| The bleed air requirements for a pressurization and environmental control system for the cabin (10) of an aircraft may be reduced by a system that includes a turbomachine (20) having a rotary compressor (22) driven by a turbine wheel (26). A ram air inlet (16) is connected to the compres |
| 5910746 |
Gate drive for a power switching device |
June 8, 1999 |
| A drive circuit for a voltage controlled power switching device includes a transformer, a full-wave rectifier bridge coupled to the transformer, first and second capacitors connected in series between nodes of the full-wave rectifier bridge and first and second controlled switches co |
| 5901609 |
Method and apparatus for a low friction safelock system |
May 11, 1999 |
| A safelock system for removable gears is provided having a self-seating gear segment rotatably mounted on a helical ball spline for bi-directional axial movement with respect to the gear teeth to be locked. A relubrication structure is provided to service the interior of the ball spl |
| 5899411 |
Aircraft electrical system providing emergency power and electric starting of propulsion engines |
May 4, 1999 |
| An aircraft is provided that includes one or more engines, an air-driven generator, and a start-circuit for operably connecting an electrical output of the air driven generator for starting one or more of the engines while the aircraft is in flight. Various embodiments also provide a |
| 5899265 |
Reflux cooler coupled with heat pipes to enhance load-sharing |
May 4, 1999 |
| A heat exchanger for aircraft electronics. The present invention provides a plurality of reflux coolers wherein each reflux cooler is primarily dedicated to cooling a specific electronic component, such as one phase of a multiphase device. The reflux coolers are undersized to adequately |
| 5880571 |
Method of and system for controlling a variable speed induction motor |
March 9, 1999 |
| A method of and system for controlling an induction motor detects input frequency to the motor and connects windings of the motor in one of a plurality of configurations in dependence upon the detected frequency. |
| 5867004 |
Relative angel estimation apparatus for a sensorless switched reluctance machine system |
February 2, 1999 |
| A control for operating an inverter coupled to a switched reluctance machine includes a relative angle estimation circuit for estimating rotor angle for a phase in the switched reluctance machine. The relative angle estimation circuit estimates a phase voltage and thereby calculates phas |
| 5863597 |
Polyurethane conformal coating process for a printed wiring board |
January 26, 1999 |
| A cost-effective process for preventing mealing of a polyurethane conformal coating applied to a printed wiring board is described. The process includes utilizing a liquid photoimagable solder mask for protecting the circuitry within the board prior to applying the polyurethane conformal |
| 5850133 |
Output overload and fault tolerant commutation method for a switched reluctance generator and an |
December 15, 1998 |
| A method of commutation of a switched reluctance machine to allow operation in a generate mode comprises the steps of closing upper and lower switches coupling a stator winding to a power bus during an increase in the inductance of a stator winding to allow a flow of current from the pow |
| 5844385 |
Absolute angle estimation apparatus for a sensorless switched reluctance machine system |
December 1, 1998 |
| An apparatus for estimating rotor position of a rotating machine having an even number of phase windings selects first and second phase position estimates developed in response to pulses applied to phase windings having associated phase profiles that are displaced at other than 180 elect |
| 5844383 |
Gas turbine engine starting system and method |
December 1, 1998 |
| A starting system and method for a gas turbine engine checks to determine whether ignition has occurred in a light off window. If such ignition has not occurred, a starter coupled to the gas turbine engine is deactuated to allow deceleration through the light off window while still attem |
