Abstract: A generator includes a stationary portion and a rotating portion. The stationary portion includes a main armature winding and the rotating portion includes a main field winding a main field rotating power converter that selectively controls current supplied to the main field winding.

Abstract: An active damping switching system includes an active damping switching apparatus, including a damping capacitor, a damping resistor coupled to the damping capacitor, an input switch coupled to the damping capacitor, an oscillator coupled to the input switch and configured to open and close the input switch at a frequency, a direct current power source coupled to the active damping switching apparatus, a constant power load and an input filter disposed between the constant power load and the active damping switching apparatus.

Abstract: A system for controlling a solid state circuit breaker comprises a solid state power switch, and a controller for providing a gate voltage to the power switch. During turnoff of the solid state power switch, the controller reduces the gate voltage to an intermediate level for a specified time period and then reduces the gate voltage to a turnoff level.

Abstract: A generator system includes a generator having a stationary portion and a rotating portion. An exciter field winding and a main armature winding are disposed on the stationary portion. An exciter armature winding and a main field winding are disposed on the rotating portion. A frequency demodulator is configured to extract a frequency modulated control signal from the exciter armature winding and to demodulate the frequency modulated control signal to generate a demodulated control signal. The generator includes a main field rotating power converter to selectively control current in the main field winding in response to the demodulated command signal. The generator system includes a generator control unit in electrical communication with the generator to monitor the output voltage at the main armature winding and to output an exciter current including the frequency modulated control signal to the exciter field winding based on the output voltage.

Abstract: An active damping switching system includes an active damping switching apparatus, including a damping capacitor, a damping resistor coupled to the damping capacitor, an input switch coupled to the damping capacitor, an oscillator coupled to the input switch and configured to open and close the input switch at a frequency, a direct current power source coupled to the active damping switching apparatus, a constant power load and an input filter disposed between the constant power load and the active damping switching apparatus.

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 method for controlling torsional oscillation includes detecting angular position of a wound field synchronous generator machine, extracting information indicative of torsional oscillation, selecting synchronous torsional oscillations, compensating for the synchronous torsional oscillations with an exciter signal, and controlling field current in the wound field synchronous generator using the exciter signal. A damping controller includes a damping module with a synchronous selective compensator and a synchronous notch filter for generating torsional oscillation compensation signals for asynchronous torsional oscillation.

Abstract: A brushless wound field synchronous generator configured to generate an output power to drive an electrical load includes a rotating rectifier assembly. The rotating rectifier assembly includes a rotating diode assembly and a field effect transistor (FET) to control voltage across the rotating diode assembly.

Abstract: An electrical machine includes a stator having a main armature winding, an exciter field winding, and a transformer primary winding. A rotor is operatively connected to rotate relative to the stator, wherein the rotor includes an exciter armature winding operatively connected to the exciter armature winding for field excitation therebetween, a main field winding operatively connected to the main armature winding for field excitation therebetween, and a transformer secondary winding operatively connected to the transformer primary winding to form a rotating transformer. A generator control unit is operatively connected to the main armature winding, exciter field winding, and transformer primary winding to control the main armature and exciter field windings based on excitation in the primary winding received from the transformer secondary winding.

Abstract: A solid state circuit-breaker switch has a first solid state switch coupled to a positive terminal of a high voltage source, a second solid state switch coupled to a return terminal of the high voltage source, and a diode connected between the switches. A load is coupled between the switches and in parallel with the diode such that voltage transients across the load are limited during turn of conditions. Related methods of operating the switch during turn-on and turn-off events within rated current operation are described, as are turn-on and turn-off events in overload conditions.

Abstract: A generator system includes a generator having a stationary portion and a rotating portion. The generator includes a permanent magnet based exciter with permanent magnets 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 power system includes an electrical power generating system (EPGS); one or more constant power loads powered by the EPGS; and a power management and distribution (PMAD) center located between the EPGS and the one or more constant power loads, the PMAD center comprising a plurality of load management channels, each of the plurality of load management channels corresponding to a respective constant power load, wherein each of the plurality of load management channels comprises a load management function and a decoupling filter.

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: 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: A power controller controls power to a load and includes a primary conductor, a current divider, first and second current sensors, and a controller. The primary conductor carries a primary current to the load. The current divider is connected between the primary conductor and the load and includes a first conductor and a second conductor. The second conductor has a greater impedance than the first conductor. The first current sensor provides a first output representative of the primary current, and the second current sensor provides a second output representative of a secondary current in the second conductor of the current divider. The controller determines the primary current to the load based upon the first output when the primary current is less than a threshold value, and based upon the second output when the primary current is greater than the threshold value.

Abstract: A direct current bus management system can include a power management and distribution unit, having a source management section, a bus management section coupled to the source management section, a load management section coupled to the bus management section, a DC bus coupled to the power management and distribution unit, a plurality of DC sources coupled to the source management section and a plurality of loads coupled to the load management section, wherein the bus management section is configured to reconfigure excess DC power on the DC bus from the DC inputs from the plurality of DC sources based on a plurality of priorities, a plurality of feedback signals and a plurality of system parameters.

Abstract: A current sensor senses a primary current in a conductor. The current sensor includes a core, a sensing device, and a magnetizing coil. The core is configured so that the primary current generates a first magnetic field concentrated in the core. A magnetic flux density of the core is established based upon the first magnetic field and a magnetic permeability of the core. The sensing device senses the magnetic flux density of the core and provides a voltage representative of the primary current. The magnetizing coil receives a magnetizing current when the primary current is greater than a threshold value. The magnetizing coil generates a coil magnetic field in response to the magnetizing current to decrease the magnetic permeability of the core.

Abstract: A system for controlling gate power includes a metal oxide semiconductor field effect transistor (MOSFET) configured to supply power to a load according to a gate control voltage applied to a gate of the MOSFET. The system includes a gate control circuit configured to turn on and off the gate control voltage supplied to the gate of the MOSFET. The system also includes a ramping circuit configured to perform at least one of ramping up a voltage applied to the gate of the MOSFET based on the gate control circuit turning on power to the gate of the MOSFET and ramping down the voltage applied to the gate of the MOSFET based on the gate control circuit turning off power to the gate of the MOSFET.

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

Abstract: A generator includes a stationary portion and a rotating portion. The stationary portion includes a main armature winding and the rotating portion includes a main field winding a main field rotating power converter that selectively controls current supplied to the main field winding.