Patent application number | Description | Published |
20080315584 | Engine start system with a regulated permanent magnet machine - An electromechanical power transfer system that transfers power between a direct current (DC) electrical power system and a prime mover, comprises: a permanent magnet machine (PMM) comprising a permanent magnet (PM) rotor that rotates a drive shaft of the prime mover, a stator with a multiphase alternating current (AC) winding coupled to the AC bus for developing a rotating magnetic field with a magnetic flux path that causes rotation of the PM rotor and a control coil with a winding that has a configuration to generate a magnetic field with flux that varies the reactance of the stator winding upon the application of current through the control coil; a plurality of AC current sensors for sensing the current in each phase of the multi-phase AC bus and generating respective AC bus current signals that represent the current level of each phase; an average current detector that receives the AC bus current signals and generates a respective current load feedback signal; a back electromotive force (emf) detector coupled to the AC bus that detects back emf generated by the stator in response to the application of AC power to the stator and generates a back emf signal representative of the detected level of back emf; a rotor position/speed estimator that receives the back emf signal and generates an estimated rotor position signal that is representative of the position of the rotor, an estimated rotor speed signal that is representative of the speed of the rotor and a closed loop enable signal that indicates a speed for the electrical starting system to switch from an open loop mode of operation to a closed loop mode of operation; a control coil current sensor for generating a control coil current signal in a control coil current feedback loop that is representative of the level of electrical current in the control coil; a first speed switch that switches between an open loop position reference signal that represents a desired position of the rotor in an open loop mode and the estimated rotor position signal that represents the position of the rotor in a closed loop mode to provide a position reference signal; a second speed switch that switches between an open loop current reference signal that represents a desired control coil current level in the open loop mode and a closed loop current reference signal that represents a desired control coil current level in the closed loop mode to provide a control coil current reference signal; an inverter/rectifier system for converting DC power from the DC power system to multiphase alternating current (AC) power on an AC bus; a control coil current regulator system for regulating current through the control coil; wherein the inverter/rectifier system responds to the position reference signal, the current load feedback signal and a current load reference signal to regulate acceleration of the PMM; wherein the control coil current regulator system responds to the control coil current reference signal and the control coil current feedback signal to regulate current in the PMM; and wherein the power transfer system starts in the open loop mode, the rotor position/speed estimator generates the closed loop enable signal that indicates a speed for the electrical starting system to switch from the open loop mode of operation to the closed loop mode of operation at a predetermined rotor speed, and the first and second speed switches respond to the closed loop enable mode to switch from their open loop mode to their closed loop mode. | 12-25-2008 |
20090008993 | Hybrid electromechanical power transfer system - An electromechanical power transfer system that transfers power between a prime mover and a combination of multiphase alternating current (AC) and direct current (DC) electrical power systems, comprises: a dynamoelectric machine that has a rotor assembly coupled to the prime mover, a main stator with a multiphase alternating current (AC) winding coupled to a main stator bus and a control coil with a winding that varies the output of the main stator with the application of control coil current; a matrix converter coupled to the main stator bus for converting AC on the main stator bus to AC of a desired electrical frequency and potential on an AC system bus; an active rectifier coupled to the main stator bus for converting AC on the main stator bus to DC of a desired potential on a DC bus; and a system control unit for generating the control coil current with a level that regulates the output of the main stator on the main stator bus, controlling the output of the matrix converter to regulate the output of the AC system bus and controlling the output of the active rectifier to regulate the output of the DC bus. | 01-08-2009 |
20090009146 | Generating system with a regulated permanent magnet machine - An electromechanical power transfer system that transfers power between a prime mover and a direct current (DC) electrical power system, comprises: a permanent magnet machine (PMM) that has a permanent magnet (PM) rotor coupled to the prime mover, a stator with a multiphase alternating current (AC) winding coupled to an AC bus and a control coil with a winding that has a configuration to generate a magnetic field with flux that varies the reactance of the stator winding with the application of control coil current; a position sensing system for generating a rotor position signal that is representative of the angular position of the PM rotor; a control coil current sensor for generating a control coil current signal that is representative of the level of electrical current in the control coil; an electrical potential sensor for generating a DC bus potential signal that is representative of the level of DC potential on the DC bus; an electrical current sensor for generating a DC bus current signal that is representative of the level of DC current that the active rectifier supplies to the electrical load by way of the DC bus; an output power estimator that compares the DC bus potential signal with the DC bus current signal to generate an output power signal; a differentiator that receives the output power signal to generate a respective rate of output power signal; a summer that adds the rate of output power signal with the DC bus potential signal to generate a DC potential feedback signal; and a selectable main active/passive rectifier system for converting multiphase AC power developed by the stator to DC power supplied to the electrical load by way of a DC bus; a control coil current regulator system to regulate the control coil current; wherein the control coil current regulator system generates a level of the control coil current that regulates current in the stator to a desired level in response to a control coil current feedback loop that comprises the control coil current signal and a DC bus potential feedback loop that comprises the DC potential feedback signal and in a generating mode the main active rectifier system maintains a constant potential on the DC bus regardless of sudden changes in electrical load on the DC bus in response to the DC bus potential feedback loop and the rotor position feedback loop; and wherein both the control coil current regulator system and the main active rectifier system switch from an active regulating mode to a protection non-regulating mode upon detection of a fault in the DC bus. | 01-08-2009 |
20090045292 | ENGINE HAVING POWER BUS FAULT SHORT CIRCUIT CONTROL WITH A DISCONNECTION SWITCH - An aircraft electrical system comprises a generator to be driven as part of a gas turbine engine. The generator supplies electrical power to a plurality of accessories associated with the gas turbine engine, and to an aircraft power bus in parallel to the supply to the accessories. A control detects a short circuit on the aircraft power bus. When a short circuit is detected on the aircraft power bus, a switch is driven open to disconnect the aircraft power bus from the generator. In this manner, the power will continue to be delivered to the plurality of accessories. In a separate feature, a control voltage is provided by an auxiliary permanent magnet generator to a voltage regulator for the main generator. | 02-19-2009 |
20090045293 | GENERATOR FOR GAS TURBINE ENGINE HAVING DC BUS FAULT SHORT CIRCUIT CONTROL USING A BATTERY - An aircraft electrical system comprises a generator to be driven as part of a gas turbine engine. The generator supplies electrical power to a plurality of accessories associated with the gas turbine engine, and to an aircraft DC bus in parallel to the supply to the accessories. A battery supplies voltage to a control circuit for the generator through a selectively opened and closed switch. A control detects a short circuit on the aircraft DC bus. The battery switch allows power from the battery to flow to provide control voltage for the generator when the control detects a short circuit on the aircraft DC bus. | 02-19-2009 |
20090079261 | GENERATOR FOR GAS TURBINE ENGINE HAVING MAIN DC BUS ACCESSORY AC BUS - An aircraft electrical system includes a generator that supplies electrical AC power to a plurality of accessories associated with a gas turbine engine. The generator also supplies power to an aircraft DC bus in parallel to the supply to the accessory bus. | 03-26-2009 |
20090091132 | STARTER/GENERATOR SYSTEM WITH CONTROL TO ADDRESS A VOLTAGE RISE - A control circuit for a generator has a control function that monitors the voltage across a bus capacitor. The circuit delivers excess voltage back to associated stator windings if an unduly high voltage is detected across the bus capacitor. | 04-09-2009 |
20090115269 | ELECTRIC MOTOR CONTROL WITH BUCK BOOST CONVERTER - A power supply for an electric motor includes a converter that can increase and decrease a voltage supplied into an inverter and then into the stator windings of the motor. As a separate feature, the inverter includes a control coil which is positioned within a motor housing such that it may be cooled by a thermal management system for the motor. | 05-07-2009 |
20090153083 | METHOD OF OPERATING A BRUSHLESS MOTOR WHEREIN OPEN LOOP AND CLOSED LOOP CONTROLLERS UTILIZE DIFFERENT COMMUTATION METHODS - A motor control is provided with both open loop and closed loop controllers. The open loop and closed loop controllers provide commutation signals back to gate drives for an inverter, wherein the commutation signals utilize sinusoidal signals in open loop control, and utilize six step commutation in closed loop control. | 06-18-2009 |
20090167225 | Motor Drive Architecture with Active Snubber - A method and apparatus is disclosed for controlling a system comprising at least one electric motor. The motor drive circuit includes a reconfigurable active snubber. Under given resonance conditions, the active snubber is configured to use a resistive element to dissipate electrical transients across the commutation circuit. | 07-02-2009 |
20090167255 | Voltage Regulation to Reduce Ripple in a Power Generation System - Methods and systems are disclosed for reducing alternating current ripples in direct current electrical power generation systems with one or more regulated permanent magnet machines. Ripple suppression is achieved, in one aspect, by modulating the control current of a regulated permanent magnet machine. | 07-02-2009 |
20090167541 | Monitoring of Capacitor - A capacitive element is monitored to detect at least one of a degradation level, a capacitor life expectancy, and preferably servicing alarms are generated upon detection of a critical health state. The system allows, among other things, non-hermetically sealed capacitances to be safely and cost-effectively used in weight-sensitive applications, such as in aircraft electronic systems. | 07-02-2009 |
20090187326 | ELECTRIC MOTOR FOR FUEL PUMP WITH IMPROVED SHUTDOWN FEATURES - An electric motor for a fuel pump is provided with a shutdown switch positioned intermediate an inverter, and its control coil. In this location, the shutdown function can be achieved without heavy components. In another feature, when the fuel pump is shut down, a signal is sent upstream to a voltage regulator associated with a generator, such that the voltage supplied downstream by the generator can be reduced to eliminate any potential voltage spike due to the shutdown of the electric motor. The electric motor with shutdown switch enables low weight fault tolerant flux regulated machines. | 07-23-2009 |
20090251020 | Permanent magnet dynamoelectric machine with variable magnetic flux excitation - A permanent magnet (PM) dynamoelectric machine with directly controllable field excitation control comprises: a drive shaft; a PM rotor assembly with multiple PMs arranged around an outer axial periphery of the rotor assembly; a stator assembly comprising a ferromagnetic stator yoke, multiple ferromagnetic stator teeth mounted to the stator yoke with distal ends proximate the outer axial periphery of the rotor assembly separated by an air gap and multiple stator coils mounted between the stator teeth; multiple saturable ferromagnetic shunts, each shunt coupling adjacent distal ends of the stator teeth to shunt air gap magnetic flux Φ | 10-08-2009 |
20090251112 | Permanent magnet electric generator with variable magnet flux excitation - A permanent magnet (PM) electric generator with directly controllable field excitation control comprises: a drive shaft; a PM rotor assembly with multiple PMs arranged around an outer axial periphery of the rotor assembly; a stator assembly comprising a ferromagnetic stator yoke, multiple ferromagnetic stator teeth mounted to the stator yoke with distal ends proximate the outer axial periphery of the rotor assembly separated by an air gap and multiple stator coils mounted between the stator teeth; multiple saturable ferromagnetic shunts, each shunt coupling adjacent distal ends of the stator teeth to shunt air gap magnetic flux Φ | 10-08-2009 |
20090256511 | Direct Flux Regulated Permanent Magnet Brushless Motor Utilizing Sensorless Control - A permanent magnet rotor for use in a flux regulated permanent magnet brushless machine is constructed such that the inductance along the direct and quadrature axes is markedly different to provide sensorless position feedback for the rotor. | 10-15-2009 |
20090261586 | Dual Channel Power Generation System - A dual channel power generation system comprises: a prime mover; a permanent magnet (PM) dynamoelectric machine that has a PM rotor coupled to the prime mover, two multiphase alternating current (AC) stators that develop electromotive force (EMF) in response to rotation of the PM rotor due to the magnetic flux linkage between the PM rotor and the stators, two control coils that each change the magnetic flux linkage of a respective stator in response to the level of a control current that passes through the control coil; a multiphase AC rectifier for each stator that receives AC power from its respective stator to supply DC power on a respective rectifier bus; a current feedback loop for each rectifier bus; a voltage feedback loop for each rectifier bus; a load-sharing controller responsive to both current feedback loops to develop a voltage regulator reference signal for each rectifier bus that is representative of the value of voltage that its corresponding stator should produce to maintain equal values of current for both rectifier buses; and a voltage regulator for each rectifier bus responsive to its respective voltage feedback loop and voltage regulator reference signal to produce the control current for its respective control coil that changes the magnetic flux linkage of its respective stator to maintain the value of voltage that its corresponding stator should produce to maintain equal values of current for both rectifier buses. | 10-22-2009 |
20090273952 | INVERTER WITH HIGH FREQUENCY ISOLATION TRANSFORMER - An inverter receives a DC power supply and converts it into AC power to a primary coil of a high frequency transformer. The output of the high frequency transformer passes through two secondary coils, and each secondary coil is associated with a bus. The busses supply positive and negative AC power to a downstream output. The flow of the power from the two busses is alternatively controlled to provide a desired frequency on the output. | 11-05-2009 |
20100034003 | Electric Power Generation and Conversion with Controlled Magnetics - A power conversion system comprises: a source of multiphase high frequency alternating current (AC) electrical input power; a high frequency controlled magnetics transformer for each phase of the multiphase high frequency AC input power, with each transformer having a primary winding coupled to its respective phase of the multiphase high frequency AC input power, at least one secondary winding that produces high frequency AC output power and at least one control winding responsive to a direct current (DC) control signal that changes the high frequency output power in proportion to the amplitude of the DC control signal; a power converter that receives the multiphase high frequency AC output power from each high frequency transformer secondary and converts it to system output power without the high frequency AC content; and a system controller responsive to the system output power that produces a DC control signal for each control winding that changes in amplitude in response to changes in a measured parameter of the system output power. | 02-11-2010 |
20100045222 | DIRECT FLUX REGULATED PERMANENT MAGNET BRUSHLESS MOTOR UTILIZING SENSORLESS CONTROL BY DC AND AC EXCITATION - A flux regulated permanent magnet brushless motor has a stator having an inner peripheral bore. A permanent magnet rotor is mounted within the inner peripheral bore. A control winding is supplied to a DC current to regulate flux of the machine. A small AC current is also supplied and an output is sensed to determine a position of the permanent magnet rotor. | 02-25-2010 |
20100141028 | MORE ELECTRIC ENGINE WITH REGULATED PERMANENT MAGNET MACHINES - A generator and associated power supply system comprises a prime mover for driving a shaft to rotate. A pair of permanent magnets is associated with the rotating shaft. A first stator winding is associated with a first of said permanent magnets, with a customer DC bus for providing a first relatively low voltage to the customer DC bus. A second of said permanent magnets is associated with a second stator winding, and an engine accessory DC bus. The engine accessory DC bus provides power to a motor controller and associated accessory motors associated with the prime mover. The engine accessory DC bus is provided with a second relatively high voltage from the second stator winding. | 06-10-2010 |
20100181969 | VOLTAGE REGULATED PERMANENT MAGNET GENERATOR - A single phase AC generator uses a rotor contained within a stator. The stator has an armature winding and a control winding which is capable of having its magnetic permeability adjusted, thereby limiting the output voltage of the armature winding. The stator additionally has two core sections. | 07-22-2010 |
20100283242 | High Voltage Start of an Engine from a Low Voltage Battery - Method and system are disclosed for starting a high voltage engine using a starter permanent magnet motor. The starter motor is powered using a DC power source remote from the starter motor. A bidirectional DC-to-DC converter local to the DC power source is used to produce a variable high voltage variable frequency power for driving the starter motor, and is remotely controlled to produce a controlled output current level. During generate mode the DC-DC converter may be used to charge the battery. | 11-11-2010 |
20100283415 | Motor Drive System with Flux Regulated PM Generator - A method of generating and controlling power for an alternating current (AC) motor by means of at least one controlled permanent magnet machine (PMM) with a permanent magnet (PM) rotor and a stator with a magnetic flux diverter circuit for controlling the output of the PMM, comprises the steps of: rotating the PM rotor at a velocity sufficient to develop a high frequency alternating current (HFAC) power output from the stator; transforming the HFAC output to produce a variable low frequency alternating current (AC) motor control output for the motor; sensing desired motor control parameters; generating a control signal responsive to the sensed parameters; and applying the control signal to the magnetic flux diverter circuit to control the motor control output. | 11-11-2010 |
20100284208 | POWER-CONVERSION CONTROL SYSTEM INCLUDING SLIDING MODE CONTROLLER AND CYCLOCONVERTER - A power-conversion control system includes an inverter, a cycloconverter, and a sliding mode controller. The inverter is operable to receive a DC voltage input and produce a first AC voltage output having a first frequency. The cycloconverter has a plurality of bidirectional switches, and is operable to receive the first AC voltage and to synthesize a second AC voltage having a second frequency that is lower than the first frequency. The sliding mode controller is operable to provide a control signal to command the plurality of bidirectional switches to turn OFF and ON when the first AC voltage is at a zero crossing condition. The sliding mode controller is also operable to selectively adjust the frequency and amplitude of the second AC voltage. | 11-11-2010 |
20100295517 | POWER GENERATING SYSTEM WITH FLUX REGULATED GENERATOR - A method for generating and controlling power by means of at least one controlled permanent magnet machine (PMM) with a permanent magnet (PM) rotor and a stator with a magnetic flux diverter circuit for controlling the output of the PMM, comprises the steps of: rotating the PM rotor at a velocity sufficient to develop a high frequency alternating current (HFAC) power output from the stator; transforming the HFAC output to produce a desired non-HFAC power output; sensing desired power output parameters; generating a control signal responsive to the sensed parameters; and applying the control signal to the magnetic flux diverter circuit to control the desired power output. | 11-25-2010 |
20100308582 | STARTING/GENERATING SYSTEM WITH MULTI-FUNCTIONAL CIRCUIT BREAKER - A pre-charge circuit limits in-rush currents on a direct current (DC) link that includes a first DC link bus and a second DC link bus. The pre-charge circuit includes a switching device connected in series with the first DC link bus. The switching device has an ON state in which power flow is enabled on the DC link and an OFF state in which power is disabled on the DC link. A controller selectively modulates the state of the switching device to limit in-rush currents on the DC link. | 12-09-2010 |
20110031841 | Permanent Magnet Brushless Machine with Magnetic Flux Regulation - A permanent magnet machine (PMM) comprises: a generally cylindrical permanent magnet (PM) rotor that comprises multiple PM rotor poles arranged around a rotor axis of rotation; and a stator with two generally cylindrical and concentric yokes, an inner yoke proximate the PM rotor with associated multiple inner poles and inner armature windings suitable for multiphase alternating current operation that form a PMM magnetic flux circuit, an outer yoke with associated multiple outer poles and outer control windings suitable for connection to a direct current source, with distal ends of the outer poles in contact with the inner yoke to form an external magnetic flux circuit that diverts magnetic flux from the PMM magnetic flux circuit; wherein application of increasing direct current to the outer windings results in increased magnetic reluctance of the external magnetic flux circuit, thereby causing the external magnetic flux circuit to divert less magnetic flux from the PMM magnetic flux circuit. | 02-10-2011 |
20110062280 | ELECTROMAGNETIC LANDING GEAR BRAKES - An electromagnetic control for the landing gear of an aircraft includes a hub to be fixed to a frame of an aircraft landing gear. A rotor rotates with a tire on the aircraft landing gear. Permanent magnetic disks are associated with the rotor, and interspersed with disks on the hub. Some of the disks on the hub are electromagnetic disks supplied with electric power, and some of the plurality of disks on the hub are made of high electric conductivity material. | 03-17-2011 |
20110062786 | ELECTRIC POWER GENERATING SYSTEM FOR MULTIPLE SOURCES AND INTERFACE TO AN AC GRID - An electric power generating system includes a plurality of variable power sources including at least one source of DC power and at least one source of AC power. Converters convert power supplied by the plurality of power sources to a common source of power to be communicated to a collector bus. A power grid supplies three-phase power to components requiring three-phase power downstream of the collector bus. Converters provide three phases of power to the power bus from the collector bus. | 03-17-2011 |
20110062833 | TRANSVERSE REGULATED FLUX ALTERNATOR - An alternator has a rotor to be associated with a prime mover shaft and driven for rotation. The rotor is provided with permanent magnets. A stator has pole pieces, including a main winding and flux diverters separating the main winding from a control coil. Control is provided for controlling the power passing through the control coil. The alternator is a transverse flux machine. A vehicle power system including the alternator is also disclosed. | 03-17-2011 |
20110121769 | MULTI-TASKING POWER PROCESSOR FOR A VEHICLE ELECTRIC SYSTEM - A multi-tasking power processor ( | 05-26-2011 |
20110128707 | POWER SEMICONDUCTOR MODULE FOR WIDE TEMPERATURE APPLICATIONS - A power semiconductor module includes an insulating substrate with a conductive circuit layer attached to one side and a baseplate attached to the other side. A power semiconductor device is attached to the conductive circuit layer. The conductive circuit layer and the baseplate are formed of a material with a coefficient of thermal expansion less than about 8.0×10 | 06-02-2011 |
20110133485 | TRANSVERSE REGULATED FLUX MACHINE - A machine has a rotor to be associated with a shaft. The rotor is provided with permanent magnets. A stator has pole pieces, including a main winding and flux diverters separating the main winding from a control coil. Control is provided for controlling the power passing through the control coil. The machine is a transverse flux machine. The machine may be utilized as a generator, an electric motor, or for other application. | 06-09-2011 |
20110133703 | ARCHITECTURE FOR DUAL SOURCE ELECTRIC POWER GENERATING SYSTEM - A dual source electric power generating system (EPGS) provides both a regulated AC output and a regulated DC output. The EPGS includes a rotating portion and a stationary portion. The stationary portion includes a plurality of windings (permanent magnet generator (PMG) armature windings, an exciter field winding, and high-voltage main generator armature windings), a voltage regulator, a rectifier, an inverter, a point of regulation (POR) sensor. The high-voltage main generator armature windings generate a high-voltage AC that is converted to a regulated, high-voltage AC by the rectifier and the inverter. The stationary portion is further characterized by circuitry for producing the regulated DC output from AC voltage produced by a winding other than the high-voltage main generator armature windings. | 06-09-2011 |
20110169328 | GENERATOR FOR GAS TURBINE ENGINE HAVING MAIN DC BUS ACCESSORY AC BUS - An aircraft electrical system includes a generator that supplies electrical AC power to a plurality of accessories associated with a gas turbine engine. The generator also supplies power to an aircraft DC bus in parallel to the supply to the accessory bus. | 07-14-2011 |
20110169357 | COMPACT ELECTROMECHANICAL ACTUATOR - An electromechanical actuator for controlling the position of an aircraft component has a linear actuator to be driven to position a component. A transverse flux motor drives the linear actuator to move in a linear direction and control the position of the component | 07-14-2011 |
20110221404 | SSPC WITH ACTIVE CURRENT LIMITING - A power distribution module has an input line to receive power from a DC power source. A switch selectively opens the input line and blocks supply of power from the input line to an output line to be connected to a DC load. A solid state power control controls a gate drive for the switch. The solid state power control is operable to distinguish between a pre-charge mode, at which current is rushing to supply a capacitor in the downstream DC load, and a short circuit mode, at which a short circuit exists. | 09-15-2011 |
20110227340 | ELECTRICAL MACHINES WITH INTEGRATED POWER AND CONTROL AND INCLUDING A CURRENT SOURCE INVERTER - A machine has a housing that includes a plurality of stator coils to be positioned adjacent to a rotor. A switching network includes a plurality of transistors and diodes connected to the coils. A current source inverter is provided by a switching network, a pair of inductors positioned on power rails, and commutating capacitors. The current source inverter and the coils are all positioned within said housing. Power architecture for a vehicle has a source of DC power, which communicates with machines through integrated motor drives. The motor drives include at least three coils positioned adjacent to the rotors for a motor associated with the integrated motor drive. A storage switching network is positioned downstream of the coils, with the storage switching network to be closed to allow power from the coils to drive the rotor, or to be opened to allow power to pass to a local storage component. | 09-22-2011 |
20110227460 | PACKAGING IMPROVEMENT FOR CONVERTER-FED TRANSVERSE FLUX MACHINE - A transverse flux machine has at least three phases, each provided by a stator core and phase windings. Each of the at least three phases is captured within a common housing. Parallel lines extend from the at least three phases, and a current source converter is created on each of the parallel lines by inductors, a switching network, and communicating capacitors, which are received within the common housing. | 09-22-2011 |
20110260534 | SSPC for AC Power Distribution - A method of operating an alternating current (AC) power distribution assembly (PDA), where the ACPDA includes a plurality of AC power distribution modules, each connected to a respective AC load includes turning a first switch off and turning a second switch on in each of the AC power distribution modules; starting up each of the respective AC loads; monitoring a load current in the ACPDA and obtaining an acceptable load current in the ACPDA; determining if a set of motor sensor parameters for the ACPDA are within predetermined limits, and, in the event the motor sensor parameters are within the predetermined limits, determining if a startup period has elapsed; and in the event the startup period has elapsed, turning the first switch on and turning the second switch off in each of the AC power distribution modules. | 10-27-2011 |
20110285202 | Bus-Tie SSPCS for DC Power Distribution System - A direct current (DC) power distribution system includes a first electrical distribution and power management (EDPM) unit including a first DC power source connected to a first high voltage DC bus connected to a first DC load, and a first bus-tie solid state power controller (SSPC) connected to the first HVDC bus; a second EDPM unit including a second DC power source connected to a second high voltage DC bus connected to a second DC load, and a second bus-tie SSPC being connected to the second HVDC bus; and a bus-tie connected between the first bus-tie SSPC and the second bus-tie SSPC, wherein in the event a power source failure occurs in the first EDPM unit, power flows from the second DC power source to the first HVDC bus via the second bus-tie SSPC, the bus-tie, and the first bus-tie SSPC. | 11-24-2011 |
20110286141 | SSPC for Soft Start of DC Link Capacitor - A solid state power controller (SSPC) for soft start of a direct current (DC) link capacitor of a DC power distribution system includes a power input connected to a DC power source of the DC power distribution system; a plurality of power switches arranged in parallel, the plurality of power switches being connected to a power output of the SSPC, the power output being connected to the DC link capacitor; and an SSPC controller configured to: pulse width modulate the plurality of power switches with a phase-shifted sequence in a current limiting mode; determine whether soft start is complete; and in response to determining that the soft start is complete, turn on the plurality of switches at a maximum gate-source voltage. | 11-24-2011 |
20110299201 | SSPC For Parallel Arc Fault Detection in DC Power System - A solid state power controller (SSPC) for detecting a parallel arc fault in a direct current (DC) power distribution system includes an input, the input being connected to a DC power source; a power switch connected to the input; an output connected to the power switch, the output being connected to a DC motor controller and associated capacitive load; an output current sensor; an output voltage sensor; and an SSPC controller, the SSPC controller being configured to determine the presence of a parallel arc fault in the DC power distribution system and control the power switch via a gate drive based on inputs from the output current sensor and the output voltage sensor. | 12-08-2011 |
20110304199 | HYBRID ELECTRIC POWER ARCHITECTURE FOR A VEHICLE - An electric architecture for use on a vehicle has a collector bus for receiving power from a plurality of power sources. The collector bus distributes power to at least a pair of subsystems which are operable at different frequency levels. Each subsystem is provided with a global bus and a local bus, and is utilized to power at least one motor. | 12-15-2011 |
20110304942 | SSPC With Dual Fault Detectors - A solid state power controller (SSPC) for a direct current (DC) electrical system includes a high bandwidth fault detector, the high bandwidth fault detector configured to detect a possible fault and place a power switch of the SSPC in saturation at a predetermined current limit; and a low bandwidth fault detector, the low bandwidth fault detector configured to determine whether the possible fault is a confirmed fault, and in the event the possible fault is determined to be the confirmed fault, turning off the power switch, or in the event the possible fault is determined not to be the confirmed fault, turning on the power switch at a minimum on-resistance. | 12-15-2011 |
20120007425 | Electric Power Generating and Distribution System Comprising a Decoupling Filter and a Solid State Power Controller - An electric power generating system (EPGS) includes a generator configured to power a direct current (DC) load via a power distribution module. The power distribution module includes a solid state power converter (SSPC). A decoupling filter is connected between the generator and the power distribution module. The decoupling filter includes an inductor connected in parallel with a resistor and a solid state switch, the resistor and solid state switch being connected in series. During current limiting conditions in the SSPC, the solid state switch of the decoupling filter is configured to be open, and during the absence of current limiting conditions in the SSPC, the solid state switch of the decoupling filter is configured to be closed. | 01-12-2012 |
20120007428 | Electric Power Generating System with Boost Converter/Synchronous Active Filter - A method of startup of an electric start electrical power generating system (EPGS) is provided. The EPGS includes a generator configured to power a direct current (DC) load via a DC bus. The method includes: disconnecting the DC load from the DC bus; connecting a battery to a boost converter, the boost converter being connected to the generator; powering the generator using the battery via the boost converter; when the generator reaches a minimum speed: disconnecting the battery from the boost converter; deactivating the boost converter; and activating a synchronous active filter, the synchronous active filter being connected to the DC bus; bringing up a voltage on the DC bus by the generator; and when the voltage on the DC bus reaches a predetermined level, connecting the DC load to the DC bus. | 01-12-2012 |
20120091939 | HIGH VOLTAGE DC ELECTRIC POWER GENERATING SYSTEM WITH PERMANENT MAGNET GENERATOR PROTECTION - A permanent magnet generator system provides protection from fault conditions. The system includes a permanent magnet generator having a first, second, and third winding wherein each winding has a first end and a second end. During the normal mode of operation, the first ends of the windings are shorted to a first neutral point and alternating current (AC) voltage developed in the first, second and third windings is provided to a primary output associated with the second ends of the windings. In response to a fault condition on the primary output side of the system, the second ends of the windings are shorted together to a second neutral point and the first ends of the windings are disconnected from the first neutral point. During the backup mode, AC voltage developed in the windings is provided to a secondary output associated with the first ends of the windings. | 04-19-2012 |
20120093668 | RIM DRIVEN THRUSTER HAVING PROPELLER DRIVE MODULES - A rim driven thruster comprises an annular housing, a propulsor assembly, a magnetic rotor assembly and a stator assembly. The annular housing defines a flow path extending along an axis. The propulsor assembly is supported within the housing and comprises propeller blades extending radially from the axis of the flow path. The propeller blades are configured to rotate about the axis. The magnetic rotor assembly is mounted to radially outer ends of the propeller blades. The stator assembly comprises spaced propeller drive modules mounted to an inner circumferential surface of the annular housing. The propeller drive modules are configured to provide electromagnetic torque to the magnetic rotor assembly. | 04-19-2012 |
20120093669 | RIM DRIVEN THRUSTER HAVING TRANSVERSE FLUX MOTOR - A rim driven thruster comprises an annular housing, a propulsor assembly, a magnetic rotor assembly and a transverse flux stator assembly. The annular housing defines a flow path extending along an axis. The propulsor assembly is supported within the housing and comprises propeller blades extending radially from the axis of the flow path. The propeller blades are configured to rotate about the axis. The magnetic rotor assembly is mounted to radially outer ends of the propeller blades. The transverse flux stator assembly is mounted to the annular housing and is configured to provide electromagnetic torque to the magnetic rotor assembly. | 04-19-2012 |
20120098261 | Systems and Methods Involving Electrical Start and Power Generation - A power generation system includes a prime mover, a generator mechanically connected to the prime mover, the generator including a field winding portion and an armature winding portion, a direct current bus node, a first variable frequency drive having an input electrically connected to the bus node and an output electrically connected to the armature winding portion, and an inverter having an input electrically connected to the bus node and an output electrically connected to the field winding portion. | 04-26-2012 |
20120119711 | HIGH VOLTAGE DC POWER GENERATION - A DC power generating system includes a permanent magnet generator (PMG), an active rectifier in electrical communication with the PMG, and a controller in electrical communication with the active rectifier, wherein the controller is configured to regulate d-q components of a stator current of the PMG in a synchronous reference frame. | 05-17-2012 |
20120120689 | FAULT TOLERANT DC POWER SYSTEMS - A fault tolerant DC power system includes a permanent magnet generator (PMG), a first contactor in electrical communication with the PMG, an active rectifier in electrical communication with the first contactor, a second contactor in electrical communication with the first contactor, and a motor drive in electrical communication with the second contactor. The first contactor is configured to sever electrical communication between the PMG and the active rectifier and the second contactor is configured to establish electrical communication between the PMG and the motor drive. | 05-17-2012 |
20120126758 | HIGH VOLTAGE DC POWER GENERATION - A DC power system includes a permanent magnet generator (PMG), and an active rectifier in electrical communication with the PMG. The active rectifier is adapted to actively rectify power output from the PMG if the PMG is operating at low speed, and the active rectifier is further adapted to passively rectify power output from the PMG if the PMG is operating at high speed. | 05-24-2012 |
20130033038 | STARTING/GENERATING SYSTEM WITH MULTI-FUNCTIONAL CIRCUIT BREAKER - A starting/generating system includes a rotor portion and a stator portion. The stator portion is connected to a DC power source during starting operations and to a DC load during generating operations, and includes a DC link having a first and second DC link bus, a DC link capacitor connected between the DC link buses, and an inverter/rectifier that converts AC power to DC power and vice versa. A switching device is connected in series on the first DC link bus and is controlled by a controller that turns the switching device On and Off to provide various functionality to the starting/generating system. | 02-07-2013 |
20130039105 | FILTER CIRCUIT FOR A MULTI-PHASE AC INPUT - A filter circuit is employed to filter undesirable harmonics in a multi-phase AC input and provide damping for oscillations associated with the filter circuit. The filter circuit includes a damping circuit connected between phases of the multi-phase AC input. The damping circuit including a rectifier for rectifying harmonics in the multi-phase AC input and a single damping resistor connected across the rectifier. | 02-14-2013 |
20130049648 | DIRECT CURRENT BUS MANAGEMENT CONTROLLER - 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. | 02-28-2013 |
20130050880 | SOLID STATE POWER CONTROLLER FOR HIGH VOLTAGE DIRECT CURRENT SYSTEMS - A solid state power controller system can include a direct current load, a solid state power controller apparatus including an alternating current sensor coupled to the direct current load, a direct current sensor coupled to the direct current load, a voltage sensor coupled to the direct current load, a main switch coupled to the direct current load via the alternating and direct current sensors, an auxiliary switch coupled in parallel to the main switch, a current limiting resistor coupled in series to the auxiliary switch and a solid state power controller coupled to the main switch, the auxiliary switch, the alternating current sensor, the direct current sensor, and the voltage sensor, and a direct current power source coupled to the solid state power controller apparatus. | 02-28-2013 |
20130050890 | MULTI-FUNCTIONAL SOLID STATE POWER CONTROLLER - A solid state power controller apparatus can include an on/off-current limit controller, a pre-charge controller coupled to the on/off-current limit controller, an active damper controller coupled to the on/off-current limit controller and a main switch coupled to and responsive to on/off and protective commands from the on/off-current limit controller. | 02-28-2013 |
20130069477 | METHOD OF FABRICATION OF PERMANENT MAGNET MACHINES WITH MAGNETIC FLUX REGULATION - A method of forming a flux regulated machine includes winding stator windings into slots in an outer core. The outer core is formed to have a plurality of radially inwardly extending tooth pieces that are circumferentially spaced, and which define the slots. Further, control coils are wound around an inner core. Then, the inner core is inserted within the outer core such that the tooth pieces contact the inner core, and such that the control coils close off the slots at a radially innermost position. A flux regulated permanent magnet machine generally made according to this method is also disclosed. | 03-21-2013 |
20130181562 | DUAL-ROTOR MACHINE - A dual rotor machine having a stator includes at least one excitation element, a first rotor located between the at least one excitation element and an axis, the first rotor configured to rotate about the axis, and a second rotor on the other side of the at least one excitation element from the axis, the second rotor configured to rotate about the axis. | 07-18-2013 |
20130181654 | MOTOR DRIVE SYSTEM EMPLOYING AN ACTIVE RECTIFIER - An active rectifier controller controls operation of an active rectifier employed in a power conversion system that supplies a direct current (DC) output to an inverter that converts the DC output to an AC output supplied to an AC motor. The active rectifier controller includes a field-oriented control (FOC) controller that monitors an alternating current (AC) input currents provided to the active rectifier, the DC output provided to the inverter, and speed of the AC motor. The FOC controller selects a reference DC output value based on the speed of the AC motor and compares the monitored DC output to the reference DC output as part of the FOC control algorithm used to generate control signals. A PWM signal generator generates PWM signals for controlling the active rectifier based on the control signals. | 07-18-2013 |
20130187579 | MOTOR DRIVE FOR PERMANENT MAGNET SYNCHRONOUS MOTOR - A pulse-width modulation (PWM) inverter controller compensates for harmonics in the output current provided by a PWM inverter to permanent magnet (PM) motor. The PWM inverter controller includes a field-oriented controller (FOC) that monitors output currents provided by the PWM inverter to the PM motor and employs the monitored output currents in a current loop feedback that generates control signals. A harmonic compensator transforms monitored phase currents into rectangular waveforms having magnitudes modified based on detected harmonics within the monitored phase currents to generate compensation signals. The compensation signals generated by the harmonic compensator are summed with the control signals generated by the FOC to generate compensated control signals. A PWM signal generator generates PWM signals for controlling the PWM inverter based on the compensated control signals. | 07-25-2013 |
20130193813 | INTEGRATED HIGH-VOLTAGE DIRECT CURRENT ELECTRIC POWER GENERATING SYSTEM - An integrated high-voltage direct current (HVDC) electric power generating system (EPGS) comprises a permanent magnet generator (PMG) including a PMG stator and a PMG rotor, wherein the PMG is disposed within a PMG housing. Also included is an armature winding operably connected to the PMG and a first rectifier for converting high-voltage AC from the armature winding, wherein the armature winding is in communication with a first boost inductor, wherein the armature winding, the first rectifier and the first boost inductor are each disposed within the PMG housing. The armature winding is operably connected to a second rectifier for converting high-voltage AC from the armature winding, wherein the armature winding is in communication with a second boost inductor, wherein the armature winding, the second rectifier and the second boost inductor are each disposed within the PMG housing. | 08-01-2013 |
20130221941 | SYSTEM AND METHOD FOR CONTROLLING SOLID STATE CIRCUIT BREAKERS - 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. | 08-29-2013 |
20130278193 | DIRECT CURRENT GENERATING, MANAGEMENT AND DISTRIBUTION SYSTEM - A direct current generating, management and distribution system includes a first armature winding, a first active rectifier having a first controller and coupled to the first armature winding, a first direct current bus coupled to the first active rectifier, a second armature winding, a second active rectifier having a second controller and coupled to the second armature winding, a second direct current bus coupled to the second active rectifier, a unit controller coupled to the first and second controllers, a first set of switches coupled to the first direct current bus and to the unit controller, a second set of switches coupled to the second direct current bus and to the unit controller, a third switch coupled to the first direct current bus and to the unit controller and a fourth switch coupled to the second direct current bus and the unit controller. | 10-24-2013 |
20130300243 | HIGH POWER DENSITY PERMANENT MAGNET MACHINE - A permanent magnet rotary machine includes a rotor and a plurality of circumferentially spaced permanent magnets spaced circumferentially about a rotational axis of the rotor. A stator is positioned adjacent the rotor, and includes a plurality of circumferentially spaced U-shaped cores. The U-shaped cores are provided with a separate coil. The cores are arranged such that at least three phases of electric power are created by three sets of the cores. | 11-14-2013 |
20130307447 | CURRENT CONTROL FOR AN ELECTRIC ACTUATOR - A controller for an electric actuator includes a reference model that generates position and speed reference signals in response to a position command signal and employs a feed forward model that accounts for dynamic loading of the electric actuator. The feed forward model receives the position and speed reference signals provided by the reference model, and in response generates feed forward signals that account for mechanical characteristics of the electric actuator. | 11-21-2013 |
20130308269 | METHOD OF CONVERTING POWER USING A POWER SEMICONDUCTOR MODULE - A method of converting power using a power semiconductor module includes conducting power to power semiconductor devices; converting the conducted power with the power semiconductor devices; conducting heat generated by the power conversion from the power semiconductor devices first through a conductive circuit layer, then through an insulating substrate, to a baseplate; and removing the heat from the baseplate. The conductive circuit layer and the baseplate are formed of a material with a coefficient of thermal expansion less than about 8.0×10 | 11-21-2013 |
20130320763 | DUAL GENERATOR SYSTEM - A dual generator system includes a main generator and an auxiliary generator. The main generator generates at least a first phase main output and a second phase main output. The auxiliary generator generates at least a first phase auxiliary output and a second phase auxiliary output, wherein the first phase auxiliary output is combined with the first phase main output to generate a first phase main output. An auxiliary generator control unit (AGCU) monitors the first phase combined output and the second phase combined output and in response independently regulates the first phase auxiliary output and the second phase auxiliary output. | 12-05-2013 |
20130325366 | ELECTRICAL POWER GENERATION AND DISTRIBUTION FAULT MANAGEMENT SYSTEM FOR A VEHICLE - An electric power system includes multiple components that include a generator, a rectifier and a power management and distribution center. Multiple sensors are configured to provide actual responses relating to each of the components. Multiple simulation models are configured to simulate responses of each of the components, and multiple comparators are configured to compare the actual responses to the simulated responses and provide compared values. A diagnostic module is in communication with the comparators and is configured to determine at least one fault in each of the components. | 12-05-2013 |
20140008915 | GEARLESS CONTRA-ROTATING WIND GENERATOR - A wind turbine generator comprises a stator disposed between first and second generator rotors. The first generator rotor comprises a first rotor shaft and an inner permanent magnet rotor. The second generator rotor is configured to contra-rotate relative to the first generator rotor, and comprises a second rotor shaft and an outer permanent magnet rotor. Inner and outer annular ferromagnetic cores are anchored respectively to radially inner and outer portions of the stator. First and second inner permanent magnets of opposite polarity are anchored to a radially outer surface of the inner permanent magnet rotor adjacent the inner annular ferromagnetic core across an inner air gap, and first and second outer permanent magnets of opposite polarity are anchored to a radially inner surface of the outer permanent magnet rotor adjacent the outer annular ferromagnetic core across an outer air gap. | 01-09-2014 |
20140028094 | POWER MANAGEMENT AND DISTRIBUTION WITH AUXILIARY DC BUS - A power management and distribution (PMAD) system includes a main DC bus, an auxiliary DC bus, a power converter, one or more hybrid solid-state circuit breakers, and a controller. The power converter converts power from the main DC bus to provide a regulated output to the auxiliary bus. Each hybrid SSCB includes a main switch connected between the main DC bus and a load and an auxiliary switch connected between the auxiliary DC bus and the load. The controller selectively turns the main switch and the auxiliary switch On/Off to selectively supply power from the main DC bus and/or the auxiliary DC bus to the load, and to selectively regulate the voltage on the auxiliary DC bus. | 01-30-2014 |
20140139062 | MODULATING CURRENT IN A DUAL GENERATOR SYSTEM - A dual-generator assembly includes a first generator configured to generate a first current and a second generator configured to generate a second current modulated based on harmonic current in the first current. | 05-22-2014 |
20140191606 | MULTI-CHANNEL WOUND-FIELD SYNCHRONOUS MACHINE - A multi-channel wound-field synchronous machine and method of assembling a multi-channel axial-flux wound-field synchronous machine are described. The machine includes an even number of stators and a plurality of field-excitation windings, each of the plurality of field-excitation windings being associated with a respective one of the stators. The machine also includes an exciter to feed all of the plurality of field-excitation windings. | 07-10-2014 |
20140203639 | RECONFIGURABLE MATRIX-BASED POWER DISTRIBUTION ARCHITECTURE - A power management and distribution (PMAD) system includes a first power supply of a first type, a second power supply of a second type different from the first type and first and second loads. The PMAD system includes a matrix of solid state power controllers (SSPCs) connected between the first and second power supplies and the first and second loads. The matrix is configured to selectively supply each of the first and second loads with a plurality of different power levels based on on/off states of the SSPCs of the matrix. | 07-24-2014 |
20140217821 | MATRIX-BASED POWER DISTRIBUTION ARCHITECTURE - A power management and distribution (PMAD) system includes first and second power supplies, first and second loads and a matrix of solid state power controllers (SSPCs) connected between the first and second power supplies and the first and second loads. The matrix is configured to selectively supply each of the first and second loads with a plurality of different power levels based on on/off states of the SSPCs of the matrix. | 08-07-2014 |
20140265693 | INTEGRATED STARTER GENERATOR - An integrated starter-generator (ISG) system includes a flux-regulated permanent magnet machine (PMM), a wound-field synchronous machine, and a control coil controller. The flux-regulated PMM includes a stationary portion having a control coil and a plurality of permanent magnets, and a rotating portion that includes rotating armature windings. The wound-field synchronous machine includes a stationary portion that includes a main armature winding and a rotating portion that includes a main field winding that receives excitation from the flux-regulated PMM. The control coil controller controls current supplied to the control coil of the flux-regulated PMM to selectively control magnetic flux presented to the rotating armature windings. | 09-18-2014 |
20140265744 | GENERATOR ARCHITECTURE WITH PMG EXCITER AND MAIN FIELD ROTATING POWER CONVERTER - 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. | 09-18-2014 |
20140265747 | EPGS ARCHITECTURE WITH MULTI-CHANNEL SYNCHRONOUS GENERATOR AND COMMON FIELD REGULATED EXCITER - 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. | 09-18-2014 |
20140266076 | EPGS ARCHITECTURE WITH MULTI-CHANNEL SYNCHRONOUS GENERATOR AND COMMON UNREGULATED PMG EXCITER - 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. | 09-18-2014 |
20140266077 | VARIABLE SPEED CONSTANT FREQUENCY SYSTEM WITH GENERATOR AND ROTATING POWER CONVERTER - An electric power generating system includes a brushless wound field synchronous generator with n-number of power generating channels and n-number of bidirectional switches alternatively controlled to provide ac power at the output. Each power generating channel includes a control rotating transformer, a rotating power converter supplying power to field winding from the rotating power supply, and a center-tap single phase armature winding connected to the bidirectional switches. Rotating power converter modulates current in the field winding to obtain desired frequency and phase at the system output. | 09-18-2014 |
20140266078 | GENERATOR ARCHITECTURE WITH MAIN FIELD ROTATING POWER CONVERTER - 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. | 09-18-2014 |
20140266079 | METHOD OF CONTROLLING ROTATING MAIN FIELD CONVERTER - 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. | 09-18-2014 |
20140268431 | ROTATING DIODE ASSEMBLY INCLUDING OVERVOLTAGE PROTECTION CIRCUIT - 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. | 09-18-2014 |
20140320194 | SOLID STATE POWER CONTROLLER GATE CONTROL - 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. | 10-30-2014 |
20140333300 | REGULATED MAGNETIC FLUX DENSITY FOR EXTENDED CURRENT MEASUREMENT - 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. | 11-13-2014 |
20140347024 | CURRENT DIVIDER FOR EXTENDED CURRENT MEASUREMENT - 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. | 11-27-2014 |
20140354049 | AUXILIARY WINDING FOR EXTENDED CURRENT MEASUREMENT - 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. | 12-04-2014 |
20140354106 | REDUCTION OF LEAKAGE FLUX IN ELECTRICAL MACHINES - An electrical machine includes an armature defining a winding slot that houses a winding. A slot opening connects into the winding slot. A flux repeller is disposed in the slot opening to reduce slot leakage flux. In certain embodiments the armature is a stationary armature defining a plurality of winding slots, each winding slot housing a winding. A rotor is disposed radially apart from the stationary armature with a radial gap defined between the armature and rotor core. Each winding slot has a slot opening that connects the winding slot to the gap. A plurality of flux repellers is included as described above, with a respective one of the flux repellers disposed in each respective slot opening to reduce slot leakage flux. | 12-04-2014 |
20140361652 | INTEGRATED ELECTROMAGNETIC CLUTCH AND EDDY-CURRENT COUPLING - 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. | 12-11-2014 |
20140368075 | PERMANENT MAGNET SYNCHRONOUS MACHINES WITH MAGNETIC FLUX REGULATION - An electrical machine has a permanent magnet component and a winding armature. The permanent magnet component is spaced apart for the winding armature. The winding armature includes a field excitation winding operative connected to the permanent magnet component. The field excitation winding is configured to selectively intensify and de-intensify the magnetic field of the permanent magnet for control of magnetic flux in the electrical machine. | 12-18-2014 |
20150035469 | SENSING PM ELECTRICAL MACHINE POSITION - 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. | 02-05-2015 |
20150035501 | SYSTEMS AND METHODS FOR CONTROLLING TORSIONAL OSCILLATION IN WOUND FIELD SYNCHRONOUS GENERATOR MACHINES - 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. | 02-05-2015 |