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Multi-Vector Electronic Control of an AC Motor Drive Reduces Torque Ripple

By suppressing or controlling harmonic currents and voltages of the motor to overcome torque ripple, this system improves the efficiency and torque performance of an AC motor, especially permanent magnet synchronous motors (PMSM). Many PMSMs use a concentrated winding, and they have large spatial harmonics. PMSMs are controlled by conventional vector control drives, but voltages and current harmonics present in the motor can deteriorate accuracy and efficiency. This technique further improves efficiency and torque performance by reducing the harmonics. This technique can be used in many types of equipment, including trucks and other vehicles, air conditioners, machine tools, robotics, and industrial equipment where quick response and accuracy in speed or position control are required.

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Innovative Aluminum Flat Solar Collector

A new flat solar collector features a heat-absorbing surface that equals the heat-transferring surface, resulting in high-heat performance and efficiency. There is no mediatory unit between the heat-transferring surface of the absorber and the heating agent. This means no galvanic corrosion, which would work as insulation. The main unit of this system is a hot-pressed and alloyed aluminum plate. The plate has shallow channels for liquid that run parallel and are connected to each other. The tips of the plate lead into the distributing or collecting pipes supplying them with a capacity of 1.7 liters, and the two necessary inputs and outputs.

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Pre-Stressed Composite Riser Tubes Transfer Loads to Metal Fittings

This technology mates load-bearing composite tubes to the metal fittings that support them, thus allowing composites to be used in applications currently requiring steel risers. The composites are geometrically pre-stressed during construction and mated to their metal fittings in a way that eliminates lateral and axial fatigue. The technology has additional application where any composite tube must join any metal fitting in a way that eliminates movement at the joint.

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Dust-Free Aerogel Insulation Works in Tight Spaces and Extreme Conditions

Most insulating applications block additional heat transfer by adding more insulation. This thin, flexible, aerogel-based thermal insulation is available in thicknesses from 0.25 to 1 mm, and achieves a thermal conductivity in the range of 15-20 milliWatts/meter-Kelvin (about 20% to 40% less than that of still air). When vacuum-encapsulated, its thermal conductivity can be lowered to 8-10 mW/m-K. The material is light, of low density, flexible, strong, and hydrophobic.

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Microshutters With Fast Switching Time for Highly Integrated Spectrometers

In contemporary spectrometers the wavelength selection is obtained through a dispersing optical element and a linear detector. The introduction of micro-cantilevers with fast response time, used as micro-shutters, allows the possibility to adopt a single sensing detector.

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Size-Controlled Fabrication of Microparticles Incorporating Active Ingredients

A scaleable technique based on ink-jet technology fabricates polymer microparticles with best-in-class size distribution. It is suitable for a variety of particle morphologies such as solid, porous, and microcapsules filled with gases, liquids, or a combination. Drugs or active ingredients can be incorporated in solid or liquid form. The monodispersity of the particles ensures excellent control of both the dose and the site/nature of delivery of the active ingredient.

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High-Efficiency, Positive-Displacement, Water-Powered Sump Pump

This invention addresses the stormwater backup damage to finished basements and below-grade construction that occurs during power outages when the AC pump cannot operate and DC battery backup pumps are unable to operate for long duration. Even during harsh storm conditions, however, municipal water supplies continue to flow through pipes separate from those that drain stormwater.

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