Abstract: A hybrid propulsion system can include an electric motor configured to convert electrical energy into motion, a battery configured to store electrical energy and operatively connected to the electric motor to provide a battery output to the electric motor and a generator configured to convert non-electrical energy into electrical energy, the generator operatively connected to the electric motor to provide a generator output to the motor simultaneously with the battery output. The system can include a controller operatively connected to the generator and configured to control the generator output of the generator as a function one or more of a state of the battery or the battery output.

Abstract: An electrical system for a vehicle can include a power supply and one or more electric motors comprising one or more electric motor controllers operatively connected to the power supply to selectively receive electrical energy from the power supply to provide electrical energy to one or more electric motors. The one or more electric motor controller can have one or more switches and operatively connected between the power supply and the one or more electric motors. The electric motor controller can be configured to modify the electrical path between the power supply and the electric motor using the one or more switches to cause at least one of a shunt to the power supply or a shunt to the electrical motor drives in an overvoltage state. The system can also include an electrical load operatively connected to the power supply.

Abstract: A system for a gas turbine engine is provided. The system comprising: a gas turbine engine including rotational components comprising an engine compressor, an engine turbine, and a rotor shaft operably connecting the engine turbine to the engine compressor, wherein each rotational component is configured to rotate when any one of the rotational components is rotated; a permanent magnet alternator operably connected to at least one of the rotational components, the permanent magnet alternator being configured to rotate the rotational components; and a motor controller in electronic communication with the permanent magnet alternator, the motor controller being configured to command the permanent magnet alternator to rotate the rotational components at a selected angular velocity for a selected period of time.

Abstract: A generator arrangement includes a generator and a pneumatic turbine. The pneumatic turbine is operably connected to the generator. A gas turbine engine compressor section is in fluid communication with the pneumatic turbine through a bleed air conduit to provide pressurized air to the pneumatic turbine for applying mechanical rotation to the generator.

Abstract: An airplane is provided. The airplane includes a vapor cycle air conditioning system that receives outside air, a bleed system with at least one port, and an electric fan. A source of outside air when the airplane is on ground is forced air from the electric fan. The source of the outside air when the airplane is at cruise is bleed air from the at least one port.

Abstract: A dual-output generator includes a first generator with a rotor, a second generator with a rotor, and first and second power converters. The rotor of the first generator is coupled to the rotor of the second generator for common rotation with the rotor of the first generator. The first power converter connects electrically to the first generator for converting rotation of the first generator rotor into direct current power. The second power converter connects electrically to the second generator for converting rotation of the second generator rotor into constant frequency alternating current power.

Abstract: A gas turbine engine is provided, comprising a tail cone and a low-pressure spool outside the tail cone. An input shaft may be coupled to the low-pressure spool and inside the tail cone. A differential may be coupled to the input shaft and inside the tail cone. A generator may be coupled to the differential and also disposed inside the tail cone. An oil pump may be configured to pump oil through the generator to the differential. A generator assembly is also provided. The generator assembly may comprise an input shaft, a differential coupled to the input shaft, a rotating transfer tube coupled to the differential, a generator coupled to rotating transfer tube, and an oil pump configured to pump oil from the generator, through the rotating transfer tube, and into the differential.

Abstract: A generator arrangement includes a generator and a pneumatic turbine. The pneumatic turbine is operably connected to the generator. A gas turbine engine compressor section is in fluid communication with the pneumatic turbine through a bleed air conduit to provide pressurized air to the pneumatic turbine for applying mechanical rotation to the generator.

Abstract: An engine starting system for a gas turbine engine is provided. The engine starting system comprising: a gas turbine engine including rotational components comprising an engine compressor, an engine turbine, and a rotor shaft operably connecting the engine turbine to the engine compressor, wherein each rotational component is configured to rotate when any one of the rotational components is rotated; a variable frequency generator operably connected to at least one of the rotational components, the variable frequency generator being configured to rotate the rotational components; and a motor controller in electronic communication with the variable frequency generator, the motor controller being configured to command the variable frequency generator to rotate the rotational components at a selected angular velocity for a selected period of time.

Abstract: An engine starting system for a gas turbine engine is provided. The engine starting system comprising: a gas turbine engine including rotational components comprising an engine compressor, an engine turbine, and a rotor shaft operably connecting the engine turbine to the engine compressor, wherein each rotational component is configured to rotate when any one of the rotational components is rotated; a permanent magnet alternator operably connected to at least one of the rotational components, the permanent magnet alternator being configured to rotate the rotational components; and a motor controller in electronic communication with the permanent magnet alternator, the motor controller being configured to command the permanent magnet alternator to rotate the rotational components at a selected angular velocity for a selected period of time.

Abstract: An electrical power generation system for a vehicle includes a prime mover, an electrical generator to generate electrical power and a gear box operably connected to the prime mover and the electrical generator to transfer rotational energy from the prime mover to the electrical generator. A braking mechanism is located at the gear box to selectably transfer rotational energy from the prime mover to the electrical generator for selective generation of electrical power. A method of electrical power generation for a vehicle includes generating rotational energy at a prime mover, transferring the rotational energy to an electrical power generator, generating electrical power via the rotational energy transfer to the electrical power generator, and periodically stopping and/or starting the transfer of rotational energy from the prime mover to the electrical power generator via a braking mechanism in operable communication with the electrical power 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 airplane is provided. The airplane includes a vapor cycle air conditioning system that receives outside air, a bleed system with at least one port, and an electric fan. A source of outside air when the airplane is on ground is forced air from the electric fan. The source of the outside air when the airplane is at cruise is bleed air from the at least one port.

Abstract: An aircraft engine assembly includes an engine housing, a low pressure spool disposed within the engine housing, and a high pressure spool disposed within the engine housing. Also included is a flux-switching machine disposed within the engine housing, the flux-switching machine comprising a rotor, a stator, a field winding and an armature winding, the flux-switching machine configured to generate power for the aircraft power system.

Abstract: A dual-output generator includes a first generator with a rotor, a second generator with a rotor, and first and second power converters. The rotor of the first generator is coupled to the rotor of the second generator for common rotation with the rotor of the first generator. The first power converter connects electrically to the first generator for converting rotation of the first generator rotor into direct current power. The second power converter connects electrically to the second generator for converting rotation of the second generator rotor into constant frequency alternating current power.

Abstract: A gas turbine engine is provided, comprising a tail cone and a low-pressure spool outside the tail cone. An input shaft may be coupled to the low-pressure spool and inside the tail cone. A differential may be coupled to the input shaft and inside the tail cone. A generator may be coupled to the differential and also disposed inside the tail cone. An oil pump may be configured to pump oil through the generator to the differential. A generator assembly is also provided. The generator assembly may comprise an input shaft, a differential coupled to the input shaft, a rotating transfer tube coupled to the differential, a generator coupled to rotating transfer tube, and an oil pump configured to pump oil from the generator, through the rotating transfer tube, and into the differential.

Abstract: An electrical power generation system includes a flux switching machine (FSM) including an FSM rotor operatively connected to an FSM stator, the FSM rotor operatively connected to a shaft, wherein the FSM includes an electrical input/output (i/o) in electrical communication with the FSM stator, and a permanent magnet machine (PMM) including a PMM rotor operatively connected to a PMM stator, the PMM rotor operatively connected to a the shaft, wherein the PMM is electrically connected to the FSM.

Abstract: An electrical power generation system includes a flux switching machine (FSM) including an FSM rotor operatively connected to an FSM stator, the FSM rotor operatively connected to a shaft, wherein the FSM includes an electrical input/output (i/o) in electrical communication with the FSM stator, and a permanent magnet machine (PMM) including a PMM rotor operatively connected to a PMM stator, the PMM rotor operatively connected to a the shaft, wherein the PMM is electrically connected to the FSM.

Abstract: A resistor pack assembly includes a first mounting plate, a second mounting plate, a cylindrical suppression resistor, and a cylindrical cover. The first mounting plate has a circular face, a first connection terminal, and a second connection terminal. The second mounting plate has a circular face, a third connection terminal and a fourth connection terminal. The cylindrical suppression resistor has a first flat surface and a second flat surface opposite the first flat surface, and is located between the first mounting plate and the second mounting plate, wherein the first flat surface contacts the circular face of the first mounting plate and the second flat surface contacts the circular face of the second mounting plate. The cylindrical cover has an inner diameter aperture, wherein the first mounting plate, the second mounting plate, and the cylindrical suppression resistor are located within the inner diameter aperture of the cylindrical cover.

Abstract: An electric power generation system (EPGS) employs both a wild-source generator and a variable and/or constant frequency generator. The wild-source generator is coupled to receive mechanical power from a low-pressure spool on an aircraft engine and to generate in response a wild-source output for consumption by voltage and frequency-tolerant loads. The variable and/or constant frequency generator is coupled to receive mechanical power from a high-pressure spool on the aircraft engine and to generate in response a variable and/or constant frequency output for consumption by voltage and frequency-intolerant loads.