Abstract: A protection system for an electrical variable speed doubly fed induction machine having a stator and a rotor, comprising: instrument transformers capable of measuring low frequency signals from the rotor and stator, in particular low frequency signals in the range of 0.1 Hz to 6 Hz; a protection relay which is configured to receive measurement values from the instrument transformers and to sample said measurements values at a constant sampling rate.

Abstract: A variable speed device that drives an electric motor includes a first acquiring unit that acquires a first parameter concerning an operation state of the electric motor, a second acquiring unit that acquires a second parameter concerning the operation state of the electric motor, the second parameter being related to the first parameter, a third acquiring unit that acquires a third parameter concerning a setting state of the electric motor, and a display control unit that simultaneously displays, on one display screen, a first display item corresponding to the acquired first parameter, a second display item corresponding to the acquired second parameter, and a third display item corresponding to the acquired third parameter. The display control unit graphically displays the first display item and the second display item in association with each other.

Abstract: A generation and distribution system includes an adjustable-speed prime mover and a doubly-fed asynchronous alternating-current (AC) generator driven by the prime mover and having a first poly-phase circuit, e.g., a stator, and a second poly-phase circuit, e.g., a rotor. The system further includes a first AC bus electrically coupled to the first poly-phase circuit configured to deliver AC power at a first AC voltage to multiple loads, and a second AC bus connected to the second poly-phase circuit configured to deliver AC power at a second AC voltage to another group of loads, the second AC voltage being lower than the first. The system includes a poly-phase transformer having first windings electrically coupled to the first AC bus and having second windings electrically coupled to the second AC bus, and a poly-phase AC-to-AC electronic converter circuit electrically coupled between the second poly-phase circuit and the second AC bus.

Abstract: A method for controlling power generation load based on coasting operation may include a first control step for judging whether a coasting operation is being executed, and a step for controlling the power generation load of a generator based on the charged level of a battery if the operation is judged as a coasting operation.

Abstract: Aspects of the present invention provide a motion control system implementing an electronic motion profile for a load that is highly optimized for power efficiency by implementing several performance parameters that are non-overlapping with respect to time. Each performance parameter may characterize an acceptable level of performance or error with respect to the electronic motion profile. Performance parameters may include, for example, maximum position error, maximum velocity error, maximum error for regions or sections of the electronic motion profile, position settling time, position repeatability, position accuracy, position bandwidth, velocity bandwidth, acceleration time, motor thermal capacity, motor temperature and drive temperature.

Abstract: A method for controlling a powertrain includes, in response to an output torque request that includes deceleration, operating an internal combustion engine in a fuel cutoff state and in a cylinder deactivation state, controlling a clutch of a torque converter in an activated state, and operating an electric machine in a regenerative braking state. A state of the powertrain related to engine speed is monitored. The internal combustion engine is commanded to transition from the cylinder deactivation state to an all-cylinder state and the electric machine operates in the regenerative braking state including ramping down magnitude of regenerative braking torque when the engine speed is less than a first threshold speed. The torque converter clutch is commanded to a released state when the engine speed is less than a second threshold speed, with the first threshold speed being greater than the second threshold speed.

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

Abstract: The present disclosure relates to a method and a generator system for operating a generator. The method for operating the generator includes exciting the field winding of a rotor of the generator by a first exciter device, driving a second exciter device while operating the generator with the first exciter device, and switching the second exciter device to excite the generator in case the first exciter device feeds to the generator not sufficient energy for operating the generator during a malfunction of the first exciter device. Further, a corresponding generator system is described.

Abstract: A vehicle includes a powertrain having an electric machine configured to selectively apply regenerative braking torque to decelerate the vehicle. The vehicle also includes a controller programmed to control a rate of change of a regenerative braking torque limit during a transmission downshift that occurs during a regenerative braking event based on a change in speed of an output shaft of the powertrain caused by the transmission downshift.

Abstract: Systems and methods for increasing the power output of wind turbines in a wind farm are disclosed. In particular, a wind farm can include first and second doubly fed induction generator wind turbine systems. The rotational rotor speed of the first wind turbine system can be regulated at reduced wind speeds based at least in part on data indicative of rotor voltage to increase power output of a doubly fed induction generator. The rotor speed can be regulated such that the rotor voltage does not exceed a voltage threshold. The power output of the first wind turbine system can be further increased by reducing its reactive power output. The reduced reactive power output of the first wind turbine system can be compensated for by an increased reactive power output of the second wind turbine system.

Abstract: An assembly including an electric generator and a steam turbine and an excitation device is provided. The excitation device is designed such that during nominal operation the auxiliary excitation machine is designed as permanently excited synchronous machine and the auxiliary excitation machine is designed as a synchronous motor or turning gear motor in a turning gear operation.

Abstract: A marine propulsion device, including an engine including a crankshaft, and a power generator including a rotor configured to be rotated by the crankshaft, and a stator arranged to face the rotor, the stator including a first coil group and a second coil group each configured to generate alternating current (AC), the second coil group being configured to generate more electric power than the first coil group. The marine propulsion device further includes a rectifier configured to rectify the AC generated by the first coil group to thereby obtain a first direct current (DC), and to output the first DC to a first battery, a converting device configured to convert the AC generated by the second coil group into a second DC, and a transformation device configured to transform a voltage of the second DC, and to output the voltage-transformed DC to a second battery.

Abstract: A power control system for a generator includes a control unit, an input sensing unit, an output sensing unit, and a power conversion unit. The input sensing unit senses a voltage and a current, generated from the generator. The output sensing unit senses a load voltage and a load current, received by the load. The power conversion unit receives the voltage and the current, and converts the voltage and the current into the load voltage and the load current. The control unit judges and predicts the mechanical behavior of the generator to control the generator according to the received voltage, the current, the load voltage, and the load current.

Abstract: An internal combustion engine includes a ring gear, a speed sensor operatively associated with the ring gear, and a change of mind (COM) starter motor mechanically linked to the internal combustion engine. The COM starter motor includes an armature and a pinion operatively connected to the armature. A solenoid is operatively connected to the COM starter motor. The solenoid selectively moves the pinion into engagement with the ring gear. An electronic control unit (ECU) is operatively connected to the speed sensor and the solenoid. The ECU is configured and disposed to indirectly detect a rotational speed of the pinion and selectively energize the solenoid to axially shift the pinion into engagement with the ring gear when the pinion reaches a particular rotational speed relative to a rotational speed of the ring gear.

Abstract: Provided is a control apparatus-integrated dynamoelectric machine in which, when an abnormality is found in a control apparatus in a final fabrication step, the control apparatus with the abnormality can be easily replaced by a normal one. The control apparatus-integrated dynamoelectric machine includes: a generator-motor portion including: a rotary shaft rotatably supported by a bracket; a rotor; a stator; and a rotation sensor; a control apparatus including: a DC-AC power interconverting circuit portion including: a power module for supplying AC power to a stator winding; and a field module for allowing a DC current to flow through a field winding; and a control circuit portion for controlling the DC-AC power interconverting circuit portion; and a connecting board provided outside of the bracket, for electrically connecting the control apparatus provided outside of the bracket and the generator-motor portion through a board terminal formed by insert molding.

Abstract: A method and architecture for recombining power of a turbomachine improving on problems of size, mass, or reliability. In the method energy is recovered in an exhaust nozzle and converted and recirculated using a mechanical and/or electrical power recombining mechanism. An example of an architecture of a turbomachine includes a main turbine engine and a heat exchanger positioned in the exhaust nozzle and coupled, via pipes, to an independent system that converts thermal energy into mechanical energy. This independent system is connected to a localized mechanical recombination mechanism via a power shaft to supply power to a power transmission shaft according to aircraft requirements.

Abstract: An aircraft (1) having a rotary wing (2) and at least one main gearbox (5) for driving rotation of said rotary wing (2), said aircraft (1) having a first main engine (11) and a second main engine (12) driving said main gearbox (5), said aircraft (1) being provided with a main regulation system (15) regulating the first main engine (11) and the second main engine (12) in application of a setpoint that is variable. A secondary engine (21) is also capable of driving said main gearbox (5), said aircraft (1) having a secondary regulation system (25) that regulates the secondary engine (21) in application of a setpoint that is constant and that is independent of said main regulation system (15).

Abstract: A UPS system includes an inverter circuit having an input coupled to a DC link and an output configured to be coupled to a load and a gang switch (e.g., a contactor) configured to couple and decouple the DC link to and from a DC power source and to couple and decouple a neutral point of the inverter circuit to and from a ground node. The gang switch may be configured to couple the neutral point to the ground node when the DC link is coupled to the DC power source and to decouple the neutral point from the ground node when the DC link is decoupled from the DC power source.

Abstract: A hybrid vehicle having a series-parallel architecture, i.e. a mechanic (gears) and an electric (generator (4), inverter (7), and motor (6)) propulsion chains associated by a planetary gear mechanism (2) powered by an engine (1). The generator rotor (4), with or without a flywheel (3), provides a kinetic energy storage due to its high inertia and speed. The stored energy is sufficient to drive simultaneously, the vehicle at low speed, and the not-fueled engine (1), during short periods. Between these periods, the fueled engine drives the vehicle and restores the stored kinetic energy. The succession of these periods made operation pulsatile at higher maximum power. Higher power means better efficiency. In addition, less pollution and perturbation compare to the “stop and start” are expected.

Abstract: An electrical power system is disclosed including a first magnetic power generator and a second magnetic power generator wherein the first magnetic power generator is positioned within the second magnetic power generator. Also disclosed is an electrical power system including a first core having a first magnet rotor and a first stator and a second core having a second magnet rotor and a second stator with the first core positioned within the second core. The first magnet rotor is capable of operating in either an opposite rotational direction or a same rotational direction as the second magnet rotor.

Abstract: A synchronous brushless machine having a single exciter field stator winding. The single exciter field stator winding is energized by a high frequency alternating current to provide a single excitation field to magnetically couple with the exciter field armature winding in both the starter mode and the generator mode. With a higher excitation frequency relative to the main armature current frequency, a steady main field voltage can be achieved which improves stability control while in the starter mode. In one or more configurations, the single exciter field stator winding is driven by a H-bridge converter.

Abstract: A method for initializing a generator may include sending a field reference voltage to an exciter that may provide a direct current (DC) current and a DC voltage to a rotor of a generator based on a current set point that corresponds to the field reference voltage. The method may then include receiving a voltage feedback signal output by the generator, determining one or more locations of one or more poles of the generator based on the voltage feedback signal, and sending one or more firing signals to one or more switches of a starter after determining the locations of the poles, such that the switches couple the voltage to a stator of the generator.

Abstract: Circuits arranged to produce first and second outputs produced by first and second switch-mode converters, respectively, wherein each switch-mode converter comprises a converter input, a converter output, a converter controller, a converter controller enable input arranged to provide power to the controller, and a semiconductor power switching device coupled between the converter input and the converter controller. A first output of the first converter and a second output of the second converter are each arranged to produce a voltage of higher magnitude than the voltage at the respective converter controller enable input and converter input when the converter controller is enabled. Methods of controlling first and second outputs from first and second switch-mode converters are also disclosed.

Abstract: In a start control apparatus for an engine generator having a booster adapted to boost an output of a battery, there is provided an engine starter adapted to supply the boosted battery output to an output winding as a motor current to start the engine, and it is configured to determine whether a position of the piston is before a top dead center (TDC) when the motor current is to be supplied to the winding, and the motor current is increased by an increment when the piston position of the engine is determined to be before the TDC.

Abstract: An electric generator system includes a rotatable shaft that is configured to rotate about a central longitudinal axis of the shaft, and a pilot permanent magnet generator (PMG) mounted to the shaft such that the pilot PMG is configured to rotate about the central longitudinal axis with the rotatable shaft. The system includes a wound field flux-switching electric machine having a rotor and a stator. The rotor is mounted to the shaft such that the rotor is configured to rotate about the central longitudinal axis with the shaft. The stator includes both a direct current (DC) field coil and an alternating current (AC) armature coil. The DC field coil is operatively connected to the pilot PMG for exciting the DC field coil.

Abstract: A constant frequency starter/generator for a turbine engine includes a first inverter/converter, a second inverter/converter, a DC link electrically connecting the first inverter/converter to the second inverter/converter, and an electric machine having a synchronous main machine, wherein the constant frequency starter/generator is operable in a start mode and a run mode.

Abstract: An electrical control and power supply system for at least one helicopter motor/generator, the system including a first DC/AC converter selectively delivering AC electrical power to the at least one motor/generator, depending on respective positions of contactors of a connection matrix actuated from an electronic control circuit, the first DC/AC converter powered with DC by a DC power supply device that includes either a circuit for rectifying an AC voltage delivered via a contactor by a starter/generator of an APU, or a voltage booster DC/DC converter powered from a battery via a contactor. The connection matrix further includes a contactor connecting the first DC/AC converter in parallel with the second DC/AC converter to make it possible, once at least one of the motors/generators has started, to inject additional power from the starter/generator of the APU.

Abstract: A system and method for providing engine torque load in real time. The system includes a sensor to determine, in real time, a clutch state of an alternator clutch and a controller for determining an alternator torque value and applying the alternator torque value to the engine torque load in real time.

Abstract: The present invention provides an excitation control circuit and the electrically excited wind power system having the same. The excitation control circuit includes a plurality of full-power converters, each of which has a generator-side converter and a grid-side converter; a DC excitation module including a plurality of DC-DC converters; and a control module, controlling or switching any DC-DC converter working normally, and controlling excitation switch turning ON or turning OFF.

Abstract: A brushless, three phase wound field synchronous machine (WFSM) provides an electromechanical power transfer system wherein it may serve as both a starter and a generator. Power for the excitation system of the WFSM is provided by a three phase flux switching generator (FSG). The three phase FSG also provides position sensor functionality for the WFSM when the WFSM operates in the starter/motor mode.

Abstract: A system, in one embodiment, may include a static starter subsystem having detection logic for indicating a conductive state of a solid state semiconductor device. The detection logic includes a first logic gate having a first input that receives a first input signal indicating a state of the static starter subsystem, a second input that receives a second input signal indicating a state of a gate firing command being applied to the solid state semiconductor device, and a third input that receives a third input signal indicating whether the solid state semiconductor device is conducting. The first logic gate may be configured to evaluate the first, second, and third input signals and provide a first output signal indicating conductivity of the solid state semiconductor device in response to the gate firing command.

Abstract: Certain embodiments of the disclosure may include systems and methods for variable speed operation of combustion engines. According to an example embodiment of the disclosure, a method is provided for controlling the operation of the combustion engine. The method can include providing power from a power source to a converter; providing frequency variable power to a generator from the converter; accelerating the generator and associated turbine to a predetermined speed by modulating the frequency variable power from the converter; after a predetermined turbine speed is achieved, disconnecting power supplied to the generator by the converter; and modulating the subsequent operation of the generator using power from the converter.

Abstract: A device for supplying electrical power to an aircraft on the ground, including two electric generators driven by an auxiliary power unit. The first generator is connected by a connection/disconnection mechanism to an aircraft network and to an electric taxiing network, to supply either an AC voltage to the aircraft network when it is connected to the aircraft network, or an AC voltage or a power to the taxiing network when it is connected to the taxiing network. The second generator is connected by the connection/disconnection mechanism to the aircraft or taxiing networks to supply the AC voltage to one of those networks.

Abstract: A starter motor for engine has a flywheel fixed to a shaft of the engine. A support is fixed relative to the engine. A space is formed between the flywheel and the support and a driving device is installed in the space. The driving device includes a stator fixed to the support and a rotor fixed to the flywheel.

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: An alternator-starter system and method is disclosed. A method of operating an alternator-starter having an inverter/rectifier for starting an engine and charging a plurality of batteries includes providing two switches for each battery, monitoring voltages of each of the plurality of batteries, and switching the switches to selectively charge individual ones of the plurality of batteries. A system includes a plurality of batteries connected in series, and includes first and second switches for each battery, the first switch being operable to switchably connect the upper rail of the inverter/rectifier with the respective (+) terminal, the second switch being operable to switchably connect the lower rail of the inverter/rectifier with the respective (?) terminal. A high voltage configuration may be utilized for motoring and generating modes.

Abstract: A circuit configuration for an electric machine, e.g., a starter motor for starting an internal combustion engine in a motor vehicle, includes a current limiting device for limiting a starting current of the electric machine. The circuit configuration includes a bridging device for bridging the current limiting device.

Abstract: A device for energy recovery for a large diesel engine includes a current generator for converting mechanical rotational energy into electric energy. The current generator includes input shaft for applying rotational energy; a steam turbine a first shaft for transmitting the rotational energy of the steam turbine to the input shaft of the current generator a power turbine and a second shaft for transmitting the rotational energy of the power turbine to the input shaft of the current generator, wherein the first shaft and the second shaft are coupled with the input shaft of the current generator. A first coupling device between the current generator and the steam turbine couples the input shaft of the current generator and the first shaft and/or a second coupling device between the current generator and the power turbine couples the input shaft of the current generator and the second shaft are provided.

Abstract: Systems and methods are provided for restarting an engine that can be selectively deactivated during idle-stop conditions. In one embodiment, current is directed to a starter motor and an electric brake sequentially by limiting the current supplied to one while current is supplied to the other, an order of delivering the current based on a timing of a restart request relative to an electric brake request, as well as vehicle operating conditions at the time the requests were received. By coordinating the operation of a starter motor with the operation of an electric brake, loading of the engine system's electrical supply can be reduced.

Abstract: A power system includes a prime mover drivingly connected to an electric motor/generator. The power system may also include a first electrical energy storage device and a second electrical energy storage device. The power system may further include power-system controls configured to selectively start the prime mover by selectively charging the first electrical energy storage device with electricity from the second electrical energy storage device and transmitting electricity from the first electrical energy storage device to the electric motor/generator to operate the electric motor/generator as an electric motor to start the prime mover.

Abstract: Certain embodiments of the disclosure may include systems and methods for variable speed operation of combustion engines. According to an example embodiment of the disclosure, a method is provided for controlling the operation of the combustion engine. The method can include providing power from a power source to a converter; providing frequency variable power to a generator from the converter; accelerating the generator and associated turbine to a predetermined speed by modulating the frequency variable power from the converter; after a predetermined turbine speed is achieved, disconnecting power supplied to the generator by the converter; and modulating subsequent operation of the generator using power from the converter.

Abstract: An electrical system for vehicles that connects multiple batteries in parallel during normal operation but isolates the cranking battery and the starter system from the other batteries and their loads when the engine is started. A common charging system simultaneously maintains all of the batteries. Efficiency and EMC considerations are addressed in the design.

Abstract: In an inverter generator having a winding wound around a generator unit driven by an engine, a converter connected to the winding and adapted to convert an alternating current outputted from the winding to a direct current, an inverter connected to the converter and adapted to invert the direct current outputted from the converter to an alternating current and output it, and a controller adapted to control operations of the converter and the inverter, a battery is connected to the engine, and the winding includes a first winding and a second winding, such that the controller supplies an output of the battery to one of the first winding and the second winding to rotate the generator unit to start the engine.

Abstract: A turbine engine starter-generator including a main electrical machine including a stator and rotor with a wound rotor inducer and damper bars forming a cage, and an exciter including a stator inducer and rotor with rotor windings connected to the rotor inducer of the main electrical machine via a rotary rectifier. During a first starting stage, the electrical machine operates in asynchronous motor mode by injecting AC into its stator windings, a starting torque being generated by the damper bars, without the rotor inducer of the main electrical machine contributing significantly to generating starting torque. Then in a second starting stage, the main electrical machine operates in synchronous motor mode by injecting AC into its stator windings, while feeding its rotor inducer with DC via the exciter, the change from the first stage to the second stage taking place when rotation speed of the shaft reaches a predetermined value.

Abstract: A plurality of generators can be connected in parallel to a common electrical bus. Each generator has a controller that regulates the voltage and frequency of the electricity being produced. Before a given generator connects to the electrical bus, its controller senses whether electricity is present on the bus and if not, the connection is made. Otherwise, the controller synchronizes the electricity being produced to the electricity is present on the bus before the connection occurs. The controller in each generator may also implement a load sharing function which ensures that the plurality of generators equitably share in providing the total amount of power demanded by the loads. The load sharing can be accomplished by controlling the generators to operate a substantially identical percentages of their individual maximum power generation capacity.

Abstract: A vehicle includes an internal combustion engine, a first rotating electric machine starting the internal combustion engine, a power control unit for operating the first rotating electric machine, a power storage device for supplying electric power to the power control unit, and a control device controlling the power control unit such that a voltage of the power storage device does not fall below a lower limit. When a change condition including a condition that the internal combustion engine is being operated is met, the control device sets the lower limit at a value lower than while the internal combustion engine is at a stop. Preferably, the change condition further includes a condition that a magnitude of voltage change of the power storage device is less than or equal to a first threshold value in addition to the condition that the internal combustion engine is being operated.

Abstract: A method of starting an aircraft engine is provided. The method includes providing motive power from a generator for starting an engine during an engine start mode and deriving electrical power by way of the generator from rotation of the engine during a generate mode, transmitting the motive power from the generator to the engine during the engine start mode by way of a constant speed drive (CSD) and regulating a frequency of the electrical power output from the generator during the generate mode by way of the CSD and coupling a generator and CSD controller (GCC) to the generator and the CSD and operating the generator and the CSD by the GCC to execute at least the engine start mode and the generate mode.

Abstract: A vehicle power source device includes a battery, a charging circuit, a capacitor, a switch, a voltage detection circuit, a current detection circuit, a control circuit, and a recording unit. The charging circuit is connected to the battery and the capacitor. A first terminal of the switch is connected to the positive electrode of the capacitor, a second terminal is connected to the positive electrode of the battery, and a third terminal is connected to a starter. The voltage detection circuit is connected in parallel to the capacitor, and detects capacitor voltage Vc. The current detection circuit is connected between the charging circuit and the positive electrode of the capacitor, and detects the capacitor charge current Ic. The control circuit is connected to the charging circuit, the switch, the starter, the voltage detection circuit, the current detection circuit, and the recording unit.

Abstract: A system includes a starter/generator that receives AC power in a start mode, and generates AC power in a generate mode; and an inverter/converter circuit that converts the generated AC power from the starter/generator to DC power for a dual-DC bus during the generate mode, and converts DC power to AC power for the starter/generator during the start mode, wherein the inverter/converter circuit denies power flow from the dual-DC bus to the starter/generator during the generate mode.

Abstract: The invention relates to a starter (10) for an internal combustion engine, comprising a starter motor (12) which can be coupled to the internal combustion engine by means of a pinion (22), and a device for engaging the pinion (22) in a gear rim (26) of the internal combustion engine and connecting the starter motor (12) to a DC voltage supply system (30, 31). In order to disconnect the sequence of operations, the device has separate means, in particular separate relays (57, 64; 60), for engaging the pinion (22) on one hand and turning on the starter motor on the other when the internal combustion engine is started, thus preventing reactions of the engagement dynamics on the contact system when the motor current is switched.