Abstract: An electromechanical actuation system (10) for a space vehicle includes a propellant source (18) and at least one turbine (14) operably connected to the propellant source (18) and rotatable by a flow of propellant (16) therefrom. At least one electrical generator (20) is operably connected to the at least one turbine (14) and is configured to convert rotation of the turbine (14) into electrical energy. At least one electromechanical actuator (12) is operably connected to the at least one electrical generator (20) such that electrical energy from the at least one electrical generator (20) drives operation of the at least one electromechanical actuator (12). A method of operating a turbine powered electromechanical actuator (12) for a space vehicle includes rotating the at least one turbine (14) via a flow of propellant (16) therethrough.

Abstract: A method for ascertaining measured values in a cyclically controlled system, the cyclic control having control time periods in which the system is controlled, and no-control time periods in which the system is not controlled, having the following operations of determining first integration time periods as a function of the cyclic control, the first integration time periods being situated within at least one of the control time periods, and/or determining second integration time periods as a function of the cyclic control, the second integration time period being situated within at least one of the no-control time periods; detecting one of the measured variables of the system dependent on the control; ascertaining summation and/or integration values by summation and/or integration of the measured variable during the first and/or second integration time periods; ascertaining the measured value for at least one of the control time periods and/or no-control time periods on the basis of time data of the first and/

Abstract: The present invention relates to a hydraulic electricity generator and separation type electric fluid pump driven by the same, wherein an external fluid in a specific space is adopted as a driving power source for driving a blade set to convert the fluid kinetic energy into rotary kinetic energy to drive a generator, and the electric power produced by the generator is transmitted through a conductive wire for transmitting electric power with a linear transmission means, thereby driving an electric fluid pump device including an electric fluid pump or electric fan and installed in the specific space, the application thereof is for example converting the external fluid kinetic energy into indoor airflows.

Abstract: A system and method are provided for controlling the speed of a motor driving a load that is electrically connected to a generator driven by an engine, through use of a first control feedback loop configured to control the rotor flux of the motor by controlling the field excitation of the generator, and a second control feedback loop configured to control the speed of the motor by controlling the throttle position of the engine.

Abstract: An electromagnetic motor having a frame, and at least one disc rotatably mounted to the frame. At least one permanent magnet is mounted on the disc, and at least one electromagnet is mounted to the frame in magnetic proximity to the at least one permanent magnet. A battery is electrically coupled to the motor for powering the at least one electromagnet. A switch controls electrical power between the battery and the at least one electromagnet, and a sensing means is provided for controlling the switch to activate the at least one electromagnet with respect to the at least one permanent magnet to cause the at least one disc to rotate. Preferably, a generator is mechanically coupled to the motor and electrically coupled to the battery for generating electrical power to the battery, and a renewable energy source such as a photovoltaic cell is electrically coupled to the motor to supplement any net electrical loss.

Abstract: Power conversion equipment includes an electric power converting section that converts DC electric power to multiphase AC electric power and feeds the converted multiphase AC electric power to a multiphase AC motor. A first short-circuit section includes a first switch disposed between a first DC power supply and the electric power converting section. A second short-circuit section includes a second switch disposed between at least one of an electric power feeding section and the electric power input section in the first DC power supply, or between a multiphase AC output point of the electric power converting section and the multiphase AC motor. A switch control section controls the first switch and the second switch such that the first and second switches are prevented from being brought into the closed-state simultaneously.

Abstract: An input/output control device for a secondary battery mounted on a vehicle includes a current estimating unit estimating a battery current input to or output from the secondary battery based on an input/output power of the secondary battery and outputting an estimated value (estimated current (Is)), a current sensor measuring the battery current and outputting a measured value (measured current (It)), and an input/output control unit controlling the input/output power based on the estimated value and the measured value. The input/output control device controls the input/output of the secondary battery, using the measured current (It) as well as the estimated value (Is), and therefore can suppress more reliably significant increase in heating value of the secondary battery and its peripheral parts.

Abstract: The invention provides a high-efficiency battery storage device system, and a motor driving body and a moving body using the system. The battery storage device system comprises (1) a main battery storage device A having high energy density relative to an auxiliary battery storage device B, (2) the auxiliary battery storage device B having high output density relative to the main battery storage device A, (3) a warm-up means for warming up the main battery storage device A to a predetermined temperature or more, (4) a warm-up monitoring means for monitoring a need for warm-up with respect to the main battery storage device A, (5) an operation mode switching means for selecting an operation mode from a warm-up operation mode and a normal operation mode and performing the selected operation mode, and (6) an electricity supply system supplying an electric power to an outside of the battery storage device system.

Abstract: A variable frequency drive comprises a diode rectifier receiving multiphase AC power from a source and converting the AC power to DC power. An inverter receives DC power and converts the DC power to AC power to drive a load. A link circuit is connected between the diode rectifier and the inverter and comprises a DC bus to provide a relatively fixed DC voltage for the inverter. A bus capacitor is across the bus. A soft charge circuit limits inrush current to the bus capacitor. The soft charge circuit comprises an inductor connected between the source and the link circuit and a switch circuit in the link circuit for selectively providing a semiconverter configuration or a full bridge converter configuration to provide two stage charging of the bus capacitor.

Abstract: A method and system for starting and operating an electrically driven load, e.g. a compressor or pump, by power supply from a mechanical driver, e.g. a turbine or combustion engine, whereby the load is mechanically connected to a first electrical machine, and the mechanical driver is mechanically connected to a second electrical machine. The first electrical machine is electrically interconnected to the second electrical machine at a standstill or when the first and or second machine have low speed. In an acceleration phase, the first electrical machine is accelerated by accelerating the second electrical machine with the mechanical driver. When the first electrical machine has reached a predefined rotational speed, the first machine is synchronized with a local electrical power network and connected it to that network.

Abstract: A drive system of an electrically driven dump truck is capable of achieving an operational feeling in which the operation amount of the accelerator pedal is well balanced with the output horsepower of the electric motors, particularly at the time of slow traveling. To achieve this, the target motor output horsepower Pm0 corresponding to the operation amount of an accelerator pedal 1 is calculated. The target motor torque Tr1R, Tr1L is calculated on the basis of the target motor output horsepower Pm0 and the rotational speed ?R, ?L of electric motors 12R, 12L respectively. The acceleration torque limit values of the electric motors 12R, 12L corresponding to the operation amount of the accelerator pedal 1 are calculated, respectively. Then, smaller values are selected, as motor torque instruction values TrR, TrL, between the acceleration torque limit value and the target motor torque Tr1R, Tr1L to control inverters 73R, 73L, respectively.

Abstract: An electric drive system includes a prime mover connected to a generator, which is controlled in part by an excitation current. The generator makes electrical power available on a dc link. A method of load demand and power generation balancing within the electric drive system includes determining a voltage of the dc link and determining a torque command by an operator of the system. A speed for each of one or more drive motors receiving power from the dc link is determined and normalized to derive an average motor speed. A mechanical power being commanded is derived based on the average motor speed and the torque command. A predicted excitation current that is required to achieve the derived mechanical power is determined and an actual excitation current is determined based on the predicted excitation current. The actual excitation current is then applied to the generator.

Abstract: A photovoltaic system having a plurality of photovoltaic modules producing electric energy and method for operating such photovoltaic system are disclosed. With the method, the photovoltaic modules are connected to a first DC motor having a motor shaft, and a generator shaft of a three-phase generator is coupled to the motor shaft. The three-phase generator can be connected to a power grid. The motor shaft of a second DC motor can be connected to the generator shaft, with only one of the two DC motors being initially driven with the electric energy produced by the photovoltaic modules. The electric energy is subsequently divided among both the first and the second DC motor. This process significantly shortens the startup process of the photovoltaic system compared to conventional systems.

Abstract: A drive system for a grid blower of a vehicle is provided. The system includes: an electrical bus, a grid of resistive elements connected to the electrical bus, the grid of resistive elements configured to thermally dissipate electrical power generated from braking of the vehicle, the electrical power being transmitted on the electrical bus to the grid of resistive elements, an electrical power modulation device configured to modify electrical power received from at least one of the electrical bus and the grid of resistive elements, and a grid blower motor coupled to an output of the electrical power modulation device, wherein a speed of the grid blower motor varies based on the electrical power that has been modified by the electrical power modulation device.

Abstract: To supply energy to motorised vehicles, a heat engine (SM) is provided to convert heat (106, 107, 108, 114) that accumulates in the vehicle at least partly into kinetic energy of the vehicle and to feed other portions of said lost heat to a heat accumulator (LWS). An optional, mechanical energy accumulator (MES) can take up kinetic energy from a vehicle motor (MGH), store said energy and deliver said energy back to a vehicle motor (MGM when required.

Abstract: A generator assembly including generator means and a first converter member (11), the generator means being arranged to convert mechanical power to electric power and comprising an AC generator (2), a voltage regulator (4) and an AC coupling, the voltage regulator (4) being arranged to regulate magnetization of the AC generator (2) on the basis of data associated with the voltage of the AC coupling of the generator means, the AC coupling being arranged to supply electric power from the AC generator (2) to the first converter member (11), and the first converter member (11) being arranged to rectify the voltage applied through the AC coupling into DC voltage. The first converter member (11) is arranged to adjust the power of the AC generator (2) by changing the component (I q) associated with the torque of the current passing through the AC coupling so as to provide the power of desired magnitude.

Abstract: A hybrid vehicle includes a power generator that generates electric power using power from an internal combustion engine; a motor that outputs power for travel of the hybrid vehicle; a first inverter connected to an electric power storage device and the motor to drive the motor; a second inverter connected to the electric power storage device; and a large drive power determination portion that determines whether the hybrid vehicle is in a large-drive-power required state in which drive power equal to or larger than a predetermined value is required for the travel of the hybrid vehicle. When it is determined that the hybrid vehicle is not in the large-drive-force required state, the second inverter is connected to the power generator. When it is determined that the hybrid vehicle is in the large-drive-force required state, the second inverter is connected to the motor.

Abstract: A method and an apparatus are described for determining a field current through a field winding in an electrical machine with a stator and a rotor. The electrical machine includes a field-circuit transformer to produce, by induction of an electrical current on the rotor side, field current with which a field winding is energized in order to generate an excitation magnetic field. The method includes driving the primary side of the field-circuit transformer to produce a field current in the rotor, which is derived from the current induced on the secondary side in the field-circuit transformer; measuring one or more phase currents in one or more primary-side phases of the field-circuit transformer; determining a maximum value depending on the one or more measured phase currents; determining the field current through the field winding depending on the determined maximum value.

Abstract: An electrical load controller that controls the starting sequence for a plurality of electrical loads includes a start demanding unit that generates a demand to start at least one of the plurality of electrical loads. A first electrical load is started immediately if the time between when a second electrical load start and when the second electrical load receives a signal indicating that the first electrical load will start (second prescribed time) is longer than the time required to send the signal between the first and second electrical loads (third prescribed time), and the time required for an inrush current to decrease to a prescribed value (first prescribed time) is less than the difference between the second prescribed time and the third prescribed time. Thus, there is sufficient time for the inrush current of the first electrical load to decrease before starting the second electrical load.

Abstract: The motor generator set described here has unique circuitry which allows for the combined electrical output of two generators to be paired up with one another as well as the output of a battery in a manner that maximizes there output. Diodes are provided in this circuitry to direct the flow of current effectively.

Abstract: The present invention relates to a system and a method for improving the use of energy in an electric motor by inducing currents generated from magnets that result in an increase of primary power and creating, directing and introducing a counter current obtained from primary coils of the motor into a resonant LC circuit which is introduced as a transient secondary process to increase the overall efficiency of the motor. Furthermore, this motor produces rotational torque without using alternating magnet polarity, but rather magnetic compression that utilizes permanent magnets arranged in a dipolar manner around an axial plane.

Abstract: 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.

Abstract: A control and power device for a rotating electrical machine comprising a management circuit and a power circuit including a number of power transistors and driver circuits associated with the power transistors. The device provides connection between the management circuit and the driver circuits for switching on the driver circuits and transmitting at least one transit potential between the management circuit and the driver circuits. The invention is applicable to alternator-starter.

Abstract: An apparatus and a method for preparing connection of a photovoltaic system (Q1) as a first energy source to a power grid (13) by way of a motor generator set (5, 6, 7) is presented. The DC motor (5) is coupled to a three-phase generator (7) by way of a shaft (6), wherein the three-phase generator (7) can be connected to the power grid (13). It has been observed that connecting this type of apparatus to the small or varying power output of the photovoltaic system (Q1) can be difficult and time-consuming. To enable a clean and quick connection, the DC motor (5) is powered with electric DC current from a second DC current source (Q2), wherein the operation of the three-phase generator (7) is matched to the conditions in the power grid (13) with the help of the second DC current source (Q2), and wherein the photovoltaic system (Q1) is connected to the DC motor (5) and the second DC current source (Q2) is disconnected from the DC motor (5) only after a complete match has been attained.

Abstract: A synchronous electric machine operates as a starter-generator for an aircraft. When operating in a starting mode, a main stator of the machine is supplied with electrical power at a constant frequency. An exciter stator is supplied with variable frequency power. As rotational speed increases, the exciter variable frequency changes correspondingly to maintain synchronous operation of the machine and maximum torque. In a generator mode, variable frequency is applied to the exciter stator with the exciter frequency varying as a function of rotational speed of an engine driving the machine. This provides for a constant frequency output from the machine.

Abstract: A system and method are provided for controlling the speed of a motor driving a load that is electrically connected to a generator driven by an engine, through use of a first control feedback loop configured to control the rotor flux of the motor by controlling the field excitation of the generator, and a second control feedback loop configured to control the speed of the motor by controlling the throttle position of the engine.

Abstract: A drive apparatus with at least one synchronous motor, a converter and a mechanical energy buffer able to be fed from an energy supply network, which, for converting mechanical energy into electrical current, includes a first asynchronous machine, and a method of operation for such a drive apparatus are specified, with which or in which the energy buffer, especially its first asynchronous machine is directly electrically connected via a switchover device to the at least one synchronous motor, so that the converter included in the drive apparatus is bypassed for such a switch position of the switchover device and the converter accordingly does not have to be designed for currents which flow in such a switch position of the switchover device.

Abstract: A motor is controlled to always consume power supplied from a power supply system or not to supply power to the power supply system, by performing control to advance or delay a phase of a 3-phase current flowing in the motor or to reduce a percentage of the generated torque with respect to an effective value of the 3-phase current of the motor, or by applying a d-axis current to the motor.

Abstract: A hybrid vehicle includes: first and second rotary electric machines; a matrix converter connecting the first and second rotary electric machines to each other to provide AC to AC power conversion between both the rotary electric machines; a battery connected to an electrical path branched off between the matrix converter and the second rotary electric motor; an inverter interposed among the battery, the matrix converter and the second rotary electric machine to convert AC power to DC power and vice versa; and a controller. The controller activates the first rotary electric machine with power fed from the battery and restrains the change in torque output of the second rotary electric machine at the activation of the first rotary electric machine.

Abstract: The control system may have an electric motor and a traction device connected to an output of the motor. The control system may also have a decelerator and a controller. The controller may be in communication with the motor and the decelerator. The controller may be configured to determine a creep torque and apply the creep torque to the traction device when the decelerator is actuated.

Abstract: An electric motor control system including a generator, an AC motor, a power converter for driving the AC motor using a DC output voltage of the generator, and an electric motor controller for controlling the power converter. The electric motor controller controls the power converter by predicting a change in the DC voltage.

Abstract: A drive system has a number of electrical machines. One machine operates as a generator supplying an output to a DC link, which in turn supplies one or more machines operating as motors to drive loads. The motors are supplied through power converters. The total capacitance of the DC link is minimized and the link kept in a stable condition by preventing it falling to a hazardous level. One embodiment prevents the phase currents adding in such a manner as to reduce the DC link voltage. Another embodiment employs freewheeling in the phase currents to prevent the DC link voltage falling below a predetermined threshold.

Abstract: An electric power supply system for driving an electric rotating machine has a generator supplied with driving power from an engine to generate alternating-current electric power and a matrix converter as an alternating-current to alternating-current direct converter supplied with the alternating-current electric power to output arbitrary alternating-current electric power. By driving a motor with the alternating-current electric power supplied from the matrix converter, only one time electric power conversion is carried out to provide high efficiency in the whole system. In addition, electric power loss can be reduced so as to enhance a motor output when the system is applied to a vehicle power supply system.

Abstract: A drive system for an electrically driven dump truck is capable of enabling electric motors for traveling to make full use of the output horsepower of the prime mover up to an output limit of the prime mover. A target motor horsepower corresponding to an operation amount of an accelerator pedal is calculated and an available maximum horsepower for the electric motors out of the maximum output horsepower of the prime mover is calculated in response to the actual revolution speed of the prime mover. The horsepower coefficient corresponding to the instantaneous revolution speed deviation is calculated. The available maximum horsepower for the electric motors is modified by the horsepower coefficient to determine a second target motor horsepower. The target motor horsepower is limited to not exceed the second target motor horsepower so as to control the torque of the electric motors.

Abstract: An electric powertrain for use with an engine and a traction device is disclosed. The electric powertrain has a DC motor/generator operable to receive at least a portion of a first mechanical output from the engine and produce a DC power output. The DC motor/generator is also operable to receive DC power and produce a second mechanical output. The electric powertrain further has a drivetrain operable to receive the DC power output and use the DC power output to drive the traction device. The drivetrain is also operable to generate DC power when the traction device is operated in a dynamic braking mode.

Abstract: A dynamoelectric machine that has at least one rotor component proximate a stator that is axially displaceable from the stator in response to pressure of lubrication oil delivered to its lubrication system has a system for changing axial displacement of each axially displaceable rotor component from the stator to cause a corresponding change in rotor-stator magnetic flux interaction, comprising: a hydraulic pump for generating a flow of lubrication oil; and means for regulating the flow of lubrication oil to the machine to develop a corresponding lubrication oil pressure that controls axial displacement of each axially displaceable rotor component.

Abstract: Disclosed is a motor vehicle comprising a generator and at least one capacitor in which recuperation power generated in a thrust phase by the generator that can be operated as a recuperator can be stored. The excitation current (IErr) that limits the power of the generator (3) can be varied in the excitation circuit of the generator (3) in accordance with at least one vehicle-specific operational parameter and/or the actual charge of the capacitor (10).

Abstract: A vehicular generator-motor control apparatus wherein a winding field type salient-pole generator-motor 1 (in FIG. 1) for a vehicle is subjected to a conduction control by a DC-AC converter 2, characterized in that a stator 1A of the vehicular winding field type salient-pole generator-motor 1 is energized by rectangular wave voltages at those conduction start angles ? of respective phases of the stator 1A which are shifted a predetermined angle relative to a rotor position, and that the conduction start angles ? of the respective phases change substantially continuously in accordance with an input voltage of the DC-AC converter 2 and a revolution speed of the generator-motor 2.

Abstract: According to the invention, there is provided a control apparatus for a motor generator of a hybrid vehicle. The control apparatus includes a determiner, a comparator, and a controller. The determiner works to determine values of a first and a second parameter, which are defined in the same unit and respectively representative of economic benefits obtainable by operating the motor generator in generator and motor modes. The comparator works to compare the determined values of the first and second parameters. The controller works to control the motor generator to operate in the generator mode when the value of the first parameter is greater than that of the second parameter and in the motor mode when the value of the second parameter is greater than that of the first parameter. With such a configuration, the control apparatus can economically shift operation of the motor generator between the generator and motor modes.

Abstract: In electric vehicle control, system voltage stabilization control is executed to reduce the difference between a target value and detected value of a system voltage generated by a voltage boosting converter for an AC motor. Further, conversion power control is executed to reduce the difference between a command value and detected value of the conversion power, which is defined as the output power of the voltage boosting converter. A conversion power correction quantity is computed from an input power operation quantity of the system voltage stabilization control and reflected in the conversion power control to correct the conversion power. Thus, variations in a system voltage caused by an error or the conversion power control can be reduced.

Abstract: In an electric force transmission device employing two motor generators and a differential device having at least three rotating members and having two degrees of freedom, the first rotating member is coupled to the first motor generator, the second rotating member is coupled to the second motor generator, and the third rotating member is coupled to an output shaft and laid out to be located between the first and the second rotating members on an aligmnent chart. Also, a controller is configured to control the motor generators such that, when the output shaft is driven from its stopped state, before the driving is started, the first and second motor generators are rotated oppositely to each other, while keeping a rotational speed of the output shaft at the stopped state.

Abstract: Provided is a drive regenerative control system of a drivee with a motor superior in torque and weight balance and suitable for miniaturization as the drive source. In a drive regenerative control system having a drive source with an electric motor, a drivee, a control circuit having a drive control circuit of the motor and a regenerative control circuit, and a detection unit for detecting the driving status of the drivee, the drive control circuit and regenerative control circuit have a control unit for controlling, linearly or in multiple stages, the duty ratio of the drive or regenerative signal to be supplied to the motor based on the phase difference of the phase of the detection signal from the detection unit and the command value signal to the motor.

Abstract: The actuator (ACT) comprises: a DC motor (MOT) having an armature energized via brushes (B) and a bar commutator with segments (L) and driving the movable element (LD) by way of a mechanical transmission device (TRD), and a device (DD) for detecting and counting the commutations occurring between the brushes (B) and the bar commutator segments (L), the mechanical transmission device (TRD) comprises a transmission element (BRK) such that, during the maneuvering phases of the movable element (LD), the supply current to the motor (MOT) is always non zero and always flows in the direction defined by the “motor” operation of the motor (MOT).

Abstract: A safety circuit for providing protection against failures that impact safety of an inverter circuit driving a Permanent Magnet Synchronous Motor (PMSM) including high and low side switches connected in a bridge and driven by a gate driver circuit during operation of the PMSM in a field weakening mode, the gate driver circuit including stages for driving the high and low side switches, the safety circuit comprising a main power supply and a back-up power supply for supplying voltage to the gate driver circuit driving the switches of the bridge of the inverter circuit, wherein if the main power supply fails to deliver adequate power to the gate driver circuit, the back-up power supply provides power to the gate driver circuit to allow the gate driver circuit to turn ON the low side switches and turn OFF the high side switches.

Abstract: V-phase upper-arm open phase detecting circuit outputs a permission signal to allow U-phase lower-arm MOSFET to be conductive when the V-phase voltage is higher than the positive electrode potential. In response to this permission signal, U-phase lower-arm driver circuit drives U-phase lower-arm MOSFET. V-phase lower-arm open phase detecting circuit outputs a permission signal to allow U-phase upper-arm MOSFET to be conductive when the V-phase voltage is lower than the negative electrode potential. In response to this permission signal, U-phase upper-arm driver circuit drives U-phase upper-arm MOSFET. Thereby, a MOS rectifying device capable of rectifying even when an open phase occurs, a driving method thereof, and a motor vehicle using thereof can be provided.

Abstract: An apparatus for generating electrical power using compressed gas is described. The apparatus includes a source of compressed gas, such as one or more tanks. A compressed gas powered turbine and an operatively coupled electrical generator are also provided. The compressed gas is blown onto vanes of the turbine in intermittent pulses or shots of compressed air instead of in a continuous stream to facilitate the most efficient use of the gas. The electrical power can be stored in batteries or capacitors for later use, or in a vehicle utilizing the apparatus, the generated electrical current can be fed directly to electrical motors that power the vehicle's wheels.

Abstract: An object of the present invention is to provide a controller for an electric four-wheel-drive vehicle, which is capable of minimizing torque changes and consuming excessive power even when the excessive power is generated by a generator. A motor control unit causes an AC motor to generate desired torque by controlling an inverter. When the power generated by the generator exceeds the power consumed by the inverter and AC motor to generate excessive power, a current command determination unit in the motor control unit consumes the excessive power by increasing a loss in the AC motor.

Abstract: A coordination control device of a power output apparatus includes a coordination control unit. The coordination control unit calculates an intermediate value between the maximum value and minimum value among voltage controls for a first motor generator, and voltage control from an AC voltage control generation unit to generate an AC voltage across neutral points of first and second motor generators, and outputs a value that is each phase voltage control for the first and second motor generators minus the calculated intermediate value to a signal generation unit as the final voltage control for the first and second motor generators.

Abstract: A first motor generator is linked to an engine and generates torque to start the engine. At time t1-t2 and time t3-t4, when current conducted to the first motor generator will exceed the upper limit value and the lower limit value due to the increase of the absolute value of a current component required to conduct alternating current across neutral points of first and second motor generators, a control device corrects a torque control value of the first motor generator such that the torque current component of the first motor generator directed to starting the engine is reduced.

Abstract: A turbogenerator/motor controller with a microprocessor based inverter having multiple modes of operation. To start the turbine, the inverter connects to and supplies fixed current, variable voltage, variable frequency, AC power to the permanent magnet turbogenerator/motor, driving the permanent magnet turbogenerator/motor as a motor to accelerate the gas turbine. During this acceleration, spark and fuel are introduced in the correct sequence, and self-sustaining gas turbine operating conditions are reached. The inverter is then disconnected from the permanent magnet generator/motor, reconfigured to a controlled 60 hertz mode, and then either supplies regulated 60 hertz three phase voltage to a stand alone load or phase locks to the utility, or to other like controllers, to operate as a supplement to the utility. In this mode of operation, the power for the inverter is derived from the permanent magnet generator/motor via high frequency rectifier bridges.