Abstract:
A rotor balancing system is provided that includes a rotor core, a plurality of core channels, a support wedge, a wedge channel, and balance masses. The rotor core includes an annular section, a first pole, and a second pole. The first and second poles each extend radially outwardly from the annular section and form an interpole region therebetween. The plurality of core channels are formed in the rotor core annular section and extend axially through the rotor core annular section. The support wedge is disposed in the interpole region. The wedge channel is formed in the support wedge and extends therethrough. One or more balance masses are selectively disposed in one or more of the core channels and the wedge channel, and each balance mass is disposed at a predetermined axial location to thereby correct rotor imbalance.
Abstract:
A rotating electrical machine, such as an aircraft starter-generator, that may be operated in either a DC motor mode or an AC generator mode. The machine includes a conventionally wound main stator that is selectively configurable as a multi-pole AC stator and a multi-pole DC stator. The machine also includes rotor windings that are configured to be selectively coupled to either an exciter or a plurality of commutator segments, and DC brushes that are selectively moveable into, and out of, electrical contact with the commutator segments, to thereby electrically couple and decouple a DC power source to and from, respectively, the rotor windings.
Abstract:
A coil retention system for a rotor of an electrical generator, such as an aircraft generator, that includes one or more components made of a high strength, lightweight composite material. By making one or more of the coil retention system components of a high strength, lightweight composite material, the generator can rotate at relatively high speeds, and can be built with a relatively small space between the generator rotor and stator. This allows the generator to supply greater output power without increasing the generator's size and/or weight.
Abstract:
Systems and methods for producing microcrystalline alpha alane are provided herein. An exemplary process for producing microcrystalline alpha alane includes reacting lithium aluminum hydride and aluminum chloride in a solvent to produce alane etherate, filtering alane etherate from the reactant, combining the filtered alane etherate with a lithium borohydride solution to produce solids that include microcrystalline alane etherate, removing remaining solvent from the solids, creating a slurry from the solids and an aromatic solvent, and heating the slurry to convert the microcrystalline alane etherate to microcrystalline alpha alane.
Abstract:
An air decontamination system including a sealed room to hold at least one person and the sealed room having an air inlet. The system further including a vacuum unit to create a negative pressure within the sealed room, by suctioning air through the air inlet into the sealed room and then from the sealed room into an inlet of the vacuum unit. The system still further including a work surface disposed in the sealed room at a predetermined height above a floor of the sealed room and the work surface to receive at least one mail piece and the air to be suctioned downwardly over the at least one mail piece and the work surface; and a filter unit to filter the air as the air is drawn out of the sealed room.
Abstract:
An outflow valve includes a valve closure mechanism that automatically closes the outflow valve in the unlikely event the outflow valve actuator becomes inoperable. The valve closure mechanism includes a pulley, a load plate, a cable, and a spring. The pulley is coupled to a valve element is the outflow valve and is configured to eccentrically rotate therewith. The cable has a first end coupled to the pulley, and a second end coupled to the load plate. The spring is disposed between the valve and the load plate and surrounds a portion of the cable. The spring is configured to supply a bias force, via the load plate and the cable, to the pulley that biases the valve element toward the closed position.
Abstract:
A starter-generator includes redundant motor/generator sets disposed within a common housing. Each motor/generator set is electrically and mechanically independent of one another, with the exception of a common input/output gear. The starter-generator is configured such that if one of the motor/generator sets experiences a predetermined torsional load, it will decouple from the input/output gear, allowing the other motor/generator set to continue operation uninterrupted.
Abstract:
One embodiment of the invention relates to a low profile electric generator having a short axial length. A cylindrical rotor body defines an interior cavity and is coupled to a driveshaft along the axis of the cylindrical body. A first rotor assembly is coupled to the inner surface of the cylindrical body, the first rotor assembly defining a space to receive a first stator that is independent from the cylindrical body. A second rotor assembly is coupled to the outer surface of the cylindrical body and electrically coupled to the first rotor assembly. A second stator is arranged around the second rotor assembly, independent from the cylindrical body, and radially positioned about the axis of the cylindrical body. By arranging the generator components in such configuration, the axial length of the generator is reduced in comparison to a conventional generator.
Abstract:
A method and system for converting source data files into executable statements in a database query language such as SQL. The source data files include files created in an extensible language format such as XML that is lexically and/or structurally dissimilar to the database query language into which the source data file is to be converted. A library of transformations is maintained in the form of style sheets for performing formatting transformations on the source data files. Typically the library comprises one or more Extensible Stylesheet Language (XSL) stylesheets. The one or more stylesheets are applied to the source data file by a transformation engine such as an Extensible Stylesheet Language Transformation (XSLT) engine. The application of the one or more stylesheets from the library of transformations results in one or more executable statements in the desired database query language, which can then be sent to and executed by a Database Management System (DBMS). These techniques can be used to simultaneously generate a wide variety of database query language statements from XML and XSLT files and are well suited to the trickle feeding of data that has been encapsulated in XML to a data warehouse by, for example, performing single row inserts.