Abstract: According to one embodiment of the present invention, a variable frequency generator is provided. The variable frequency generator can comprise a main stator comprising multi-phase armature windings and an exciter field winding; and a rotating portion comprising an exciter multi-phase windings, a main field winding, and an amplification component between the exciter windings and the main field winding, wherein the amplification component operates at a variable duty cycle to maintain a phase voltage of the main stator armature windings near independent of a shaft speed of the variable frequency generator.

Abstract: A variable speed analog current (AC) generator system includes a main generator unit in electrical communication with a rotary transformer. The main generator unit outputs a main output power signal, and the rotary transformer adjusts a frequency of the main output power signal. The variable speed analog current (AC) generator system further includes an electronic exciter controller in electrical communication with the rotary transformer. The exciter controller is configured to determine a desired frequency of the main output power and apply an exciter signal having an adjustable exciter frequency to maintain the main output power signal at the desired frequency.

Abstract: An electromagnetic actuator includes a magnetic circuit that includes a stationary core having a first leg, a second leg and a connecting leg that connects the first and second legs, the stationary core being formed of a high temperature ferromagnetic material, and an armature formed of the high temperature ferromagnetic material. The actuator also includes one or more position returning members disposed between the stationary core and the armature and a first winding surrounding the first leg, the first winding being formed a metal wire with ceramic insulation.

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 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 power controller controls power to a load and includes a primary current sensor, a controller and a current source. The primary current sensor includes a primary conductor and an auxiliary conductor. The primary conductor carries a primary current to the load and the auxiliary conductor carries an auxiliary current in the opposite direction of the primary current to provide partial flux cancellation. The primary current sensor provides an output voltage based upon a magnetic field generated by the primary current and auxiliary current. The controller determines the primary current based upon the output voltage and the auxiliary current. The current source provides the auxiliary current. The controller controls the current source to provide the auxiliary current to the auxiliary conductor if the primary current is greater than a threshold value.

Abstract: Embodiments of the disclosure include a de-icing system for an aircraft. The de-icing system includes a plurality of resistive-inductive heating elements inserted adjacent to a flight control surface and a controller configured to provide a supply current to each of the plurality of resistive-inductive heating elements. Each of the plurality of resistive-inductive heating elements produces an electromagnetic field normal to the flight control surfaces and resistive heat in response to the supply current. The electromagnetic field induces an eddy current in the flight control surface.

Abstract: An electromagnetic device for overspeed control of a propeller driven by an engine shaft comprises a clutch, an eddy-current coupler, and an electromagnetic brake. The clutch is disposed to mechanically decouple the propeller from the engine shaft. The eddy current coupler is disposed to electromagnetically couple the propeller to the engine shaft when the clutch mechanically decouples the propeller from the engine shaft. The electronic brake is disposed to artificially load the engine shaft when the propeller load on the engine shaft is reduced by mechanically decoupling the propeller from the engine shaft.

Abstract: A hybrid permanent magnet machine has a stator including armature windings. A rotor includes permanent magnets, a main field winding, and a rechargeable energy source. An output voltage control circuit, including an H bridge circuit configured to provide control current magnitude and direction in the main field winding to control the current passing across the main field windings.

Abstract: A rotor portion of a synchronous machine includes a rotor. The rotor carries a field winding and a re-chargeable power storage device. The re-chargeable power storage device is electrically connected to the field winding to provide electrical power to the field winding while in generate or motor mode, and to provide electrical power to the re-chargeable power storage device while in a charge mode.

Abstract: A system for transmission of power includes a clutch having a driven clutch member and a driving clutch member. The driven and driving clutch members are operatively connected to one another for common rotation in a first position with the clutch members engaged to one another and for rotation relative to one another in a second position with the clutch members disengaged from one another. An eddy-current coupling is operatively connected to selectively move at least one of the clutch members to engage and disengage the clutch members between the first and second positions. The eddy-current coupling is also operatively connected to provide electromagnetic eddy-current coupling between the clutch members with the clutch members in the second position disengaged from one another to drive the driven clutch member at a rate different from that of the driving clutch member.

Abstract: An electromagnetic solenoid actuator comprises a ferromagnetic core and a ferromagnetic plunger. The ferromagnetic core supports a plurality of windings, and is oriented along an axis. The ferromagnetic plunger is aligned axially with the ferromagnetic core, and is translatable along the axis to vary a width of an air gap separating the ferromagnetic plunger from the ferromagnetic core. The ferromagnetic plunger and the ferromagnetic core overlap axially at a flux bypass that provides an alternative flux path that diverts increasing flux away from the air gap as the width of air gap decreases.

Abstract: A more-electric engine (MEE) system configured to operate in a plurality of operating modes includes a first power generating sub-system and a second power generating sub-system. The first power generating sub-system is configured to output electric power to a first power bus. The second power generating sub-system is configured to output electric power to a second power bus. The MEE system further includes an electronic source/load management and distribution (SLMD) module in power and signal communication with each of the first power generating sub-system, the second power generating sub-system, and the plurality of electrical sub-systems. The electronic SLMD module is configured to selectively operate the MEE system in one of a first operating mode or a second operating mode among the plurality of operating modes. The first and second operating modes adjust the delivery of the first and second electric power to the first and second power buses.

Abstract: A generator includes a stationary portion and a rotating portion. The stationary portion includes a permanent magnet and a main armature winding. The rotating portion includes a main field winding and a main field rotating power converter that regulates current through the main field winding.

Abstract: A common-mode choke includes a plurality of hybrid core inductors and a printed circuit board. Each of the plurality of hybrid core inductors includes a first core made of a first material, a second core made of a second material, and at least one common coil configured to generate a magnetic field in both the first and second cores. The printed circuit board is configured to connect the plurality of hybrid core inductors in series.

Abstract: A starter-generator module for a gas turbine engine includes an inner stator portion with an armature defining a rotation axis and an outer rotor portion disposed about the rotation axis. The outer rotor portion includes a permanent magnet and a gear teeth member. The permanent magnet is disposed about the rotation axis and the gear teeth member is defined on the outer rotor portion such that the gear teeth member transmits rotational energy to an accessory gearbox in a start mode and receives rotational energy from the accessory gearbox in a generate mode.

Abstract: An electric system and method includes a flux regulated permanent magnet generator configured to provide power for an accessory electric system. The accessory electric system includes an engine accessory and a voltage regulator. The engine accessory includes an induction motor that receives power from the flux regulated permanent magnet generator. The voltage regulator is configured to control an output of the flux regulated permanent magnet generator to maintain a constant voltage-to-frequency ratio.

Abstract: A generator system includes a generator having a stationary portion and a rotating portion. The generator includes an exciter field winding disposed on the stationary portion. A first channel includes a first main field winding and a first main field power converter disposed on a rotating portion. The first main field power converter selectively delivers voltage from the exciter winding to the first main field winding. A second channel includes a second main field winding and a second main field power converter disposed on the rotating portion. The second main field power converter selectively delivers voltage from the exciter winding to the second main field winding. A generator control unit is connected to the first channel and the second channel. The generator control unit monitors an output voltage at each of the first channel and the second channel and generates the first and second control signals based on the output voltage.

Abstract: An electrical machine includes a stator having a stator winding and a secondary transformer coil. A rotor is operatively connected to rotate relative to the stator, wherein the rotor includes a plurality of embedded permanent magnets. A primary transformer coil is wound on the rotor and is operatively connected to form a rotating transformer with the secondary transformer coil. An inverter/active rectifier component is operatively connected to the stator winding and the secondary transformer coil to control the stator winding based on a sense in the secondary transformer coil received from the primary transformer coil.

Abstract: A multiplex winding synchronous generator includes a stator core with a plurality of winding slots; and power coils being distributed in each of the winding slots that are configured to supply multi-phase alternating current (AC) power. Also, the stator core includes at least two sets of power coils being distributed in the slots.