Abstract: A hybrid electrical machine containing surface mounted magnets which includes a magnetically permeable cylindrically shaped stator assembly having at least one stator winding formed about a plurality of stator teeth, a rotor assembly concentrically disposed within the stator assembly, including a magnetically permeable rotor backiron, a rotational drive mechanism coupled to the rotor backiron, and a plurality of protruding rotor poles, each including a magnetically permeable pole support assembly, a winding provided around the pole support assembly, and a radially magnetized permanent magnet assembly disposed about the pole support assembly.

Abstract: A permanent magnet machine is disclosed, including a stator assembly which includes a housing, a stator backiron, a plurality of windings disposed in the housing coupled to a plurality of electrical connections, and a plurality of stator teeth coupled to the stator backiron. The permanent magnet also includes a rotor assembly which includes a center configured to couple to a mechanical coupling member disposed about the center, an inner core, positioned around the center, an outer core disposed around the inner core, and a plurality of outwardly protruding poles radially located within the stator assembly each outwardly protruding pole having an outer surface adjacent to at least one tooth of the plurality of teeth. Each outer surface of each outwardly protruding pole having a rotor tooth extending from the outer core and a permanent magnet disposed next to the rotor tooth.

Abstract: Methods and apparatus for characterizing magnetic properties of materials, such as a material's anhysteretic B-H characteristic or its permeability as a function of B or H. A test apparatus for determining these magnetic properties is constructed to yield a symmetrical field distribution through material being tested to avoid localized saturation within the material. Characterization methods take into account radial variations in tangential field intensities when calculating the magnetic properties. The calculations are obtained as solutions of optimization problems through optimization methods such as genetic algorithms.

Abstract: Power electronic based power and propulsion systems are used in a wide variety of applications including locomotives, hybrid electric vehicles, aircraft, spacecraft, and ships. In general, the power electronic loads in such systems have tightly regulated outputs which causes them to behave as constant power loads exhibiting negative input impedances in a small signal sense. Such systems can be prone to negative impedance instability. The present invention mitigates negative impedance instability without the introduction of any passive or active devices into the system by providing nonlinear modulation of the power into the power electronic load.

Abstract: A solid state transformer having an input stage operatively coupled to an isolation stage. The input stage converts a high voltage, single phase AC input voltage to a plurality of unisolated DC output voltages. Each unisolated DC output voltage is at a voltage level which is less than the voltage level of the AC input voltage and each of the unisolated DC output voltages is separately isolated in the isolation stage.