Abstract: An energy harvester system includes an aircraft power cable carrying an alternating current and an energy harvester. The energy harvester includes a ferromagnetic ring encircling the aircraft power cable and configured so that the alternating current in the aircraft power cable generates magnetic flux in the ferromagnetic ring and an inductive coil wrapped around at least a portion of the ferromagnetic ring to generate a voltage from the magnetic flux in the ferromagnetic ring.

Abstract: A rotor includes a shaft. A plurality of rotor modules are disposed about the shaft. Each of the rotor modules includes a cylindrical support ring, a ferromagnetic core radially outward of the support ring, at least one PM arc arranged in a first ring and at least one PM arc arranged in a second ring, the first and second ring being radially outward of the ferromagnetic core, and a retainer having a first wall disposed radially outward of the first ring and the second ring and a second wall defining an axial boundary between the first ring and the second ring.

Abstract: A claw pole synchronous machine includes a housing and a rotor being rotatable relative to the housing and having a plurality of first claw poles circumferentially alternating with a plurality of second claw poles. The plurality of first claw poles are axially overlapping with the plurality of second claw poles. At least two DC excitation coils are fixed relative to the housing and configured to provide a magnetic field to the rotor. A stator is fixed to the housing.

Abstract: A transformer-inductor assembly includes a core, a primary winding, and a secondary winding. The primary winding is wrapped about the core. The secondary winding is wrapped about the primary winding. One or more ferromagnetic bars per phase are arranged between the secondary winding and the primary winding to control the inductance to the transformer-inductor assembly secondary winding. An electrical system including the transformer-inductor assembly and method of transforming voltage of alternating current using the transformer-inductor assembly are also described.

Abstract: A transformer-inductor assembly includes a core, a primary winding, and a secondary winding. The primary winding is wrapped about the core. The secondary winding is wrapped about the primary winding. One or more ferromagnetic bars per phase are arranged between the secondary winding and the primary winding to control the inductance to the transformer-inductor assembly secondary winding. An electrical system including the transformer-inductor assembly and method of transforming voltage of alternating current using the transformer-inductor assembly are also described.

Abstract: A stator for a generator includes a ferromagnetic core with two or more poles arranged about a rotation axis, a direct current (DC) field coil, and four or more alternating current (AC) coils. The DC field coil is wrapped about the pole. A first of the AC coils is wrapped about the pole at a location circumferentially spaced from a second of the AC coils. Generator systems and methods self-exciting synchronous reluctance generators are also described.

Abstract: A rotor has a ferromagnetic body with a surface and magnetic poles arranged about a rotation axis. One or more of the magnetic poles has a first magnetic flux barrier and a second magnetic flux barrier. The first magnetic flux barrier is arranged radially between the rotation axis and the surface of the ferromagnetic body. The second magnetic flux barrier is arranged radially between the first magnetic flux barrier and the surface of the ferromagnetic body.

Abstract: According to an aspect of the disclosure herein, a generator is provided herein. The generator includes a rotor that further includes a plurality of slots. The generator also includes a three-phase winding configured to produce a first magnetic field and an excitation winding. The excitation winding is a material filling in the plurality of slots and produces a second magnetic field. In turn, a rotation of the generator induces alternating voltage in the stator three-phase winding and the stator excitation winding excites the magnetic flux in the rotor.

Abstract: An electric power generating system (EPGS) may comprise a permanent magnet generator (PMG) comprising a rotor comprising a permanent magnet and a stator comprising a first armature winding configured to output a first three-phase voltage, and a second armature winding configured to output a second three-phase voltage. The EPGS may further comprise a passive rectifier configured to rectify the first three-phase voltage, an active rectifier configured to rectify the second three-phase voltage, and an active rectifier controller, wherein the active rectifier is controllable in response to a current reference received by the active rectifier controller. An EPGS may comprise a tunable notch filter configured to filter a first DC voltage and/or a DC output voltage, in accordance with various embodiments.

Abstract: An assembly for operating a DC synchronous machine according to an exemplary aspect of the present disclosure includes, among other things, a controller that is configured to determine a position of a rotating portion utilizing a carrier signal, adjust current supply to a field winding, and monitor and adjust operation of the DC synchronous machine based on various electrical parameters relating to the carrier signal. A method for operating a DC synchronous machine is also disclosed.

Abstract: An electric power generating system (EPGS) may comprise a permanent magnet generator (PMG) comprising a rotor comprising a permanent magnet and a stator comprising a first armature winding configured to output a first three-phase voltage, and a second armature winding configured to output a second three-phase voltage. The EPGS may further comprise a passive rectifier configured to rectify the first three-phase voltage, an active rectifier configured to rectify the second three-phase voltage, and an active rectifier controller, wherein the active rectifier is controllable in response to a current reference received by the active rectifier controller. An EPGS may comprise a tunable notch filter configured to filter a first DC voltage and/or a DC output voltage, in accordance with various embodiments.

Abstract: Embodiments herein relate to a permanent magnet (PM) dynamoelectric machine. The machine includes a drive shaft, a stator assembly having a ferromagnetic stator core, a plurality stator teeth mounted to the stator core with distal ends proximate the inner radial periphery of the stator assembly and a plurality of stator coils mounted between the stator teeth, and a PM rotor assembly with multiple PMs, a ferromagnetic rotor core, a plurality of ferromagnetic rotor teeth mounted to the rotor core with distal ends proximate an inner periphery of the stator assembly separated by an air gap, and at least one control coil, the at least one control coil wrapped about a saturable region of each the rotor teeth. Each saturable region of the rotor teeth is operable to divert air gap magnetic flux (?g) generated by the PMs across the air gap through the distal ends of the rotor teeth.

Abstract: An assembly for a direct current (DC) synchronous machine, according to an exemplary aspect of the present disclosure includes, among other things, a stationary portion including a direct current (DC) armature winding and a rotating portion including alternating current (AC) field winding configured to supply DC output to the DC armature winding. A rotating inverter is configured to selectively communicate current to the AC field winding such that a frequency of the current is adjusted to approach synchronization with a position of the rotating portion. A method for generating DC output from a DC synchronous machine is also disclosed.

Abstract: A synchronous machine is disclosed which includes a stator defined by an annular stator yoke having a central axis, and a rotor axially supported within the stator and defined by a central rotor yoke having a plurality of radially extending rotor pole cores, each rotor pole core having a radially outer arcuate rotor pole shoe, wherein a permanent magnet is positioned between each circumferentially adjacent pair of rotor pole shoes and a field excitation winding is associated with each rotor pole core.

Abstract: An apparatus for electromagnetic actuation includes a cylindrical housing. The apparatus further includes at least two stationary cores fixed to the cylindrical housing. Each stationary core includes at least one first annular portion having a first annular thickness between a first inner diameter and a first outer diameter. The apparatus further includes a ring coil fixed to and in operable communication with each of the at least two stationary cores. The apparatus further includes a ferromagnetic armature concentrically aligned with the at least two stationary cores and configured to move relative to the at least two stationary cores. The ferromagnetic armature has at least one second annular portion having a second annular thickness between a second inner diameter and a second outer diameter. The second annular thickness is about the same as the first annular thickness.

Abstract: An actuator includes a yoke extending about a rotation axis. A coil is wrapped about the yoke. A rotor having a direct axis and a quadrature axis is supported for rotation about a rotation axis relative to the yoke. The rotor has a reluctance along the direct axis that is different than a reluctance along the quadrature axis to rotate the rotor when current is applied to the coil.

Abstract: An assembly for operating a DC synchronous machine according to an exemplary aspect of the present disclosure includes, among other things, a controller that is configured to determine a position of a rotating portion utilizing a carrier signal, adjust current supply to a field winding, and monitor and adjust operation of the DC synchronous machine based on various electrical parameters relating to the carrier signal. A method for operating a DC synchronous machine is also disclosed.

Abstract: An electric machine is provided and includes a stator that includes teeth, conductive windings configured to be wound about the teeth and a rotor rotatable about the stator. The rotor includes an annular core defining first slots along a circumferential dimension and one or more second slots along the circumferential dimension between neighboring first slots, permanent magnets disposable in the first slots and cage windings disposable in the second slots.

Abstract: A line start synchronous-reluctance (LSSRM) brushless motor includes a stator that is arranged at an inner circumferential surface of a motor body and that extends longitudinally along an axis to define a central opening. A rotor assembly is disposed in the central opening. The rotor assembly includes a rotor that is configured to rotate via a shaft, and that is surrounded by the stator to define an air gap between an outer edge of the rotor and the stator. The rotor assembly further includes a plurality rotor slots arranged along the circumference of the outer edge, and at least one magnetic flux barrier aligned with a group of opposing rotor slots.

Abstract: Embodiments herein relate to a permanent magnet (PM) dynamoelectric machine. The machine includes a drive shaft, a PM rotor assembly with multiple PMs arranged around a periphery of the rotor assembly, a first stator assembly including a stator yoke, having stator teeth mounted to the stator core with distal ends proximate the outer periphery of the rotor assembly separated by a first air gap and multiple stator coils mounted between the stator teeth. The machine also includes a second stator assembly including a stator yoke, having stator teeth mounted to the stator core with distal ends forming closed slots, proximate an inner periphery of the rotor assembly separated by a second air gap and at least one control coil, the a control coil wrapped about a saturable region of the stator teeth thereof, each saturable region is operable to divert magnetic flux of the PMs through the stator teeth.