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| Number | Title | Issue Date |
| 8016551 | Reverse curved nozzle for radial inflow turbines A nozzle for radial inflow turbines having an outer surface having a concave shape, and an inner surface having a non-concave, i.e. straight or convex, shape. Also a leading edge may have a hole that is capable of receiving a fastener to secure the nozzle vane to an... | 09/13/2011 |
| 8015838 | On-board inert gas generation turbocompressor systems and methods The present invention provides a system and method for cooling the bleed air supply in an on-board inert gas generation system. The gas generation system cools the bleed air using a turbocompressor in conjunction with heat exchangers. Exhaust from a regenerative hea... | 09/13/2011 |
| 7970497 | Smart hybrid electric and bleed architecture An aircraft architecture may be designed to create an optimal balance between electric power and bleed power in order to match or improve current more electric architecture (MEA) performance while simplifying power extraction from the engines as well as simplifying ... | 06/28/2011 |
| 7966925 | Combination mismatched metal-to-metal seal and O-ring seal with vent hole in between for high temperature and high pressure environment A sealing unit includes a mismatched metal-to-metal seal and an o-ring seal with a vent hole therebetween. The mismatched metal-to-metal seal may provide a sealing surface between two metals that may withstand high temperatures and pressure while avoiding leakage ov... | 06/28/2011 |
| 7952316 | Variable frequency reduced speed variation electric drive A multiple-winding induction machine may be used to obtain a reduced-speed-variation electric drive when using a variable-frequency power distribution system. Each winding may have a different number of poles. The winding with the smallest number of poles may operat... | 05/31/2011 |
| 7952221 | Enhanced DC electric main engine start system A starting system for aircraft engines employs power from multiple power sources. Each engine is started with a starter motor that is driven by the same multiple power sources which collectively provide starting power. As engine speed increases during each starting ... | 05/31/2011 |
| 7948127 | Connection method for rotating rectifiers on a generator An annular bus ring assembly for connecting main rotor windings of a generator to the exciter diodes includes a plurality of annular bus rings with tabs bent over forming plurality of pads mounted on either side of a dielectric hub. The pads of annular bus rings clo... | 05/24/2011 |
| 7946403 | Mechanical disconnect dual-sided interlocking teeth A disengagement/disconnect assembly for disengaging a generator from a gear box may include an inner ball screw having an angled threading on an outer surface thereof and surrounding and operatively engaged to a rotating generator drive shaft to cause rotation of th... | 05/24/2011 |
| 7937949 | Emergency power engine restart system An engine starting apparatus and method may allow for two methods of engine start where only one engine gearbox accessory pad exists off the aircraft engine. A gearbox lubricating apparatus may also be provided to lubricate the gearbox at altitude without added comp... | 05/10/2011 |
| 7922120 | Wing ice protection heater element network An ice prevention network comprising a plurality of non-overlapping heater elements arranged in a grid along an airfoil is provided, powered by a multiphase power source, each phase powering selected heater elements that can selectively be powered on and powered off... | 04/12/2011 |
| 7915869 | Single stage starter/generator with rotor quadrature AC excitation When driven by a variable speed prime mover, a generator system provides relatively constant frequency AC power by independently controlling the main rotor flux rotational speed. The generator system includes an exciter stator that induces current in the exciter rot... | 03/29/2011 |
| 7906866 | AC/AC power converter for aircraft A matrix converter circuit having two AC/AC matrix converters coupled in parallel in a first mode to power a starter and decoupled in a second mode to each power separate functions used in aircraft power applications. Three common functional modes include 1) start m... | 03/15/2011 |
| 7905259 | Advanced carbon dioxide fuel tank inerting system An onboard inert gas generation system includes an evaporator comprising a vessel that receives a hydrocarbon fuel from a fuel tank, separates vapor fuel components from liquid fuel components, establishes a nearly constant fuel vapor composition, and outputs the fu... | 03/15/2011 |
| 7898827 | Active EMI filtering using magnetic coupling cancellation An active electromagnetic interference (EMI) filtering may reduce the requirements for high current differential mode inductors. The active EMI filtering of the present invention may be useful in power devices that use switching power converters. Conventional EMI di... | 03/01/2011 |
| 7884495 | Method and apparatus for hot swap of line replaceable modules for AC and DC electric power systems A method and an apparatus are used in hot swap of AC or DC line replaceable modules (40A). The apparatus according to one embodiment comprises a pin assembly (183), the pin assembly (183) being connectable to a module (40A) and connectabl... | 02/08/2011 |
| 7848121 | Advanced matrix converter and method for operation A matrix converter may be provided with AC switches that comprise bi-directional sets of semiconductor switches that are gated with a common gating link. A low loss diode-bridge based snubber may facilitate introduction of time delay between sequential operations of... | 12/07/2010 |
| 7872379 | Integrated electric power distribution center fire protection system An electrical distribution control system for a vehicle such as an aircraft may be provided fire-suppression protection without requiring that all control elements are located in a fire-containment enclosure. A primary electric load center (ECL) may be located in a ... | 01/18/2011 |
| 7871243 | Augmented vaneless diffuser containment A containment system comprises at least one passage obstructer extending from a housing inlet cover through a diffuser passage and into a housing back cover. The passage obstructer includes a fastener portion, such as a bolt, and an obstructing portion extending fro... | 01/18/2011 |
| 7870717 | Advanced hydrogen auxiliary power unit An auxiliary power unit includes an autothermal reformer for producing a reformate from fuel; a turbine; a combustor for burning the reformate to power the turbine; a recuperator for obtaining thermal energy to improve the efficiency of the auxiliary power unit; a s... | 01/18/2011 |
| 7869554 | Phase/frequency estimator-based phase locked loop A phase/frequency estimator-based phase locked loop (PFE-PLL) may be use to obtain a phase and frequency estimation by using an algebraic summer, a gain block and a (co)sine waveform generator. The apparatus and methods of the present invention may provide the phase... | 01/11/2011 |
| 7869178 | Augmentation of ambient temperature and free convection effects in thermal circuit breaker trip curve approximations An electrical overload protection system may be based on a solid state control system. A solid state switch may open responsively to commands for a solid-state controller. The controller may perform calculations to determine accumulated energy in a protected conduct... | 01/11/2011 |
| 7868621 | Power line communication based aircraft power distribution system with real time wiring integrity monitoring capability A power line communication-based aircraft power distribution system may allow for both power line communication (PLC) technology and spread spectrum time domain reflectometry (SSTDR) technology to be utilized in aircraft power distribution systems to achieve key mai... | 01/11/2011 |
| 7867319 | Filled epoxy tubesheet A filled epoxy tubesheet comprises an epoxy filled with a metal, such as aluminum flakes. Embodiments of the filled epoxy tubesheets can bend due to stress on the surface rather than crack. Embodiments of the filled epoxy tubesheet can be used to improve Air Separat... | 01/11/2011 |
| 7863870 | Self-adjusting bleeder for a forward converter A switched mode power supply (SMPS) may be operated with uncoupled output inductors. Overvoltage produced by “low-load” conditions may be controlled through use of an adaptive regulating bleeder. The bleeder may comprise a shunt regulator and a power dissipation... | 01/04/2011 |
| 7863868 | Generator with quadrature AC excitation A generator system is configured to supply two phase excitation current from an exciter rotor to a main generator rotor. When driven by a variable speed prime mover, the generator system provides relatively constant frequency AC power by independently controlling th... | 01/04/2011 |
| 7863867 | Overload control of an electric power generation system A control system for an electrical power generation system (EPGS) provides overload protection without disconnecting a generator of the EPGS from an excessive electrical load. Available engine power and current levels of the electrical load are continuously measured... | 01/04/2011 |
| 7859381 | Autotransformer using printed wireboard An autotransformer for use in low frequency, high power applications that uses a stack of printed wire boards constructed of a top, inner, and bottom layer including electrical trace windings circumventing the transformer core and formed in the inner layer for direc... | 12/28/2010 |
| 7852646 | Instantaneous load current control scheme for voltage fed DC to AC inverter supplying resistive-inductive load A control system is provided for controlling varying alternating current (AC) to a load with varying resistance and inductance. A plurality of nested control loops may employ cascaded proportional controllers to provide desired control of a pulse width modulation (P... | 12/14/2010 |
| 7850532 | Axial impact shaft system A stub shaft of a main rotor shaft of a generator has its flange or shoulder removed from its outer portion so in the event of a bending failure of the stub shaft the resulting axial load of the stub shaft is not transmitted to the main rotor shaft. Instead of a ret... | 12/14/2010 |
| 7834637 | Method and apparatus for generalized AC and DC arc fault detection and protection According to the features discussed herein, through a single generalized arc-fault detection algorithm, various types of series and/or parallel arc faults can be detected without any nuisance trip for either AC or DC Electric Power Systems. Running Discrete Fourier ... | 11/16/2010 |
| 7830682 | DC component elimination at output voltage of PWM inverters A control system for a PWM inverter may reduce a DC component of an output of the inverter. An output voltage signal may be attenuated with a low-pass filter to produce a signal with a high DC content. A duty cycle of an output of the low pass filter may be determin... | 11/09/2010 |
| 7817382 | Hybrid high voltage DC contactor with arc energy diversion A contactor may operate to interrupt current in a circuit while the circuit is operating under load. A shunt is provided to by-pass surge power current around contacts to reduce arcing. The shunt includes a solid-state switch that may be operated in a series of puls... | 10/19/2010 |
| 7815163 | Design of a noise suppression wedge for a butterfly outflow valve A noise suppression wedge for a butterfly valve comprises a wedge-shaped structure having a plurality of fingers and a plurality of slots. The noise suppression wedge is positioned in contact with the butterfly plate and reduces noise by disrupting the flow through ... | 10/19/2010 |
| 7812495 | Sleeve in end rings for permanent magnet rotor A permanent magnet rotor for an electric motor may include a rotor assembly that will hold the magnets in place. A pair of rings is added to the sleeve to tightly engage and press against the end plates and the magnets. This configuration provides additional securem... | 10/12/2010 |
| 7805204 | Integrated electrical power distribution system using common building blocks An electrical power distribution system includes a data bus, separate from the main aircraft data bus, internal to the aircraft electrical power distribution system and an electric power control unit (EPCU) in communication with the internal data bus. Primary and em... | 09/28/2010 |
| 7800925 | Mitigation of unbalanced input DC for inverter applications Mitigating the DC content of an AC output from an inverter is important for electrical system reliability. The inverter may be powered by unbalanced DC inputs while still mitigating the DC content of the AC output wavefrom. The present invention provides methods to ... | 09/21/2010 |
| 7800245 | Method and architecture for reduction in vehicle wiring Systems and methods perform power conversion and distribution. A system for power conversion and distribution, according to one embodiment comprises: a first generator substation (70) receiving power from a first electrical generator (10); a first main... | 09/21/2010 |
| 7791887 | Contour surface cooling of electronics devices The present invention provides a cooling device including a heat generating device having a device surface with a device surface contour on at least a portion of the device surface and a base having a base surface with a base surface contour on at least a portion of... | 09/07/2010 |
| 7788792 | Method of fabricating rotor assemblies having chemically bonded lamination stacks A rotor assembly or other rotating device having a stack of laminations or laminates that are chemically bonded together. Chemical bond of the laminates may have a strength that approaches the strength of the material of metal laminates. Chemical bonds may be effect... | 09/07/2010 |
| 7777370 | Integrated gate drive for use in control and protection of power modules A method and apparatus for providing isolated high and low direct current power supplies to a Power Device using a sealed high Power Device Gate Driver having a single transformer, wherein the Gate Driver integrates the power supplies, gating control and gate contro... | 08/17/2010 |
