Abstract: Disclosed is a control system for a variable frequency generator including a main stator winding for providing a generator output, excited by a main rotor winding, and a main exciter rotor winding for energizing the main rotor winding, excited by a main exciter field winding. The control system includes: a plurality of inputs adapted to receive respective signals corresponding to respective generator operating parameters; an output adapted to drive the main exciter field winding; and a plurality of negative feedback loops between the output and the inputs. Each loop includes a respective stability compensation network operable to process a feedback signal corresponding to one of the generator operating parameters.

Abstract: A method is provided for regulating a three-phase machine functioning under any operational conditions without a mechanical rotary transducer. The machine is supplied with D.C. power by an inverter, where parameters of a D.C. link using an actual switching state of the inverter are detected for regulation. The method includes measuring (1) flow direction required for field-oriented control in asynchronous machines, and (2) rotor position for rotor-oriented control in synchronous machines. The measuring is performed by using spatial magnetic conductivity fluctuations in the machine. The conductivity fluctuations are detected using parameters for a D.C. link. An actual switching state of an inverter is used in the measuring process. Mathematical evaluation to calculate flow direction or rotor direction is then performed.

Abstract: This invention is a method and system for a hybrid electric vehicle adaptive fuel strategy to quickly mature an adaptive fuel table. The strategy adaptively alters the amount of fuel delivered to an internal combustion engine to optimize engine efficiency and emissions using engine sensors. Before the adaptive fuel strategy is permitted, an engine “on” idle arbitration logic requires the HEV to be in idle conditions, with normal battery state of charge, normal vacuum in the climate control and brake system reservoir; and, the vapor canister not needing purging. The strategy orders the engine throttle to sweep different airflow regions of the engine to adapt cells within the adaptive fuel table. In the preferred configuration, a generator attached to the vehicle drive train, adds and subtracts torque to maintain constant engine speed during the throttle sweeps.

Abstract: The operation of a generator is improved in the efficiency throughout a wider range of revolutions.

Abstract: A method of controlling a claw-pole synchronous machine with enhanced controllability without incurring additional expensiveness. Operation of the claw-pole synchronous machine is controlled through a vector control of an armature voltage and an armature current supplied from an inverter power source in combination with a field current control. When the claw-pole synchronous machine is operated as a generator, the field current is controlled on the basis of a demanded output power and rotation speed of the claw-pole synchronous machine while a field weakening control with the armature current (id) is performed by controlling magnitude and a phase difference angle (Ø) of the armature current (id).

Abstract: A multi-voltage electrical system for a vehicle is described, which includes a generator and a voltage regulator; the voltage regulator regulates the output voltage of the generator to predeterminable values by varying the exciter current. Connected downstream of the generator are two rectifier arrangements, which lead to a terminal (B1) and a terminal (B2), respectively. At least the rectifier arrangement leading to the terminal having the lower voltage is designed as a controllable rectifier and is triggered by the voltage regulator in such a way that the desired voltage (UB1+) occurs. The other rectifier arrangement leads to the terminal (B2+), at which a higher voltage occurs, by suitable regulation of the exciter current. The controllable rectifier arrangement preferably includes six MOS field effect transistors.

Abstract: A battery is charged utilizing electric power provided by a power supply line included in a cable that is in accordance with IEEE 1394. A charging apparatus and a personal computer are connected together by the cable. A power source unit in the personal computer converts AC voltage to direct voltage and supplies the DC voltage to the power supply line. The voltage is applied to a charging circuit via the power supply line, thereby charging the battery. A signal line included in the cable is used when the charging apparatus and personal computer send and receive data to and from each other.

Abstract: Two generation systems 3, 8 each including inverter 8 are switched over between series connection and parallel connection by switching section 5. Reference waveform signals are mutually communicated between the two generation systems through communication lines 6. When a phase difference between these two reference waveform signals is within a predetermined range, the inverters are driven to generate an output alternating current. One of the conduction angles of thyristors 3a, 3a in two converters 3, 3 which is larger than the other is inputted to a deviation detector 42. Based on a deviation of the conduction angle inputted from a target conduction angle, an updated target rotational speed is set in a calculator 44. A throttle controller 48 controls a throttle opening angle so that an actual rotational speed converges into the target rotational speed.

Abstract: An auxiliary power unit (“APU”) system and methods used to bring such system on-line and off-line are disclosed. An APU generator forming part of an APU system, is brought “on-line” smoothly in order to replace a primary generator operating at a steady-state rotational speed that is interconnected with a load. A controller forming part of the APU system controls rotational speed of the APU and thereby the generator so that it approaches a rotational speed beneath the steady-state rotational speed of the primary generator. The controller then connects the APU generator to the load and the primary generator. This causes the APU generator to motor at the steady-state rotational speed dictated by the primary generator. Thereafter, the controller may increase rotational speed of the APU generator until it provides power to the load and the primary generator may be disconnected from the load.

Abstract: An alternator generates output power at two or more independent voltages. The alternator has two independent output windings configured to generate the power needed for each output. Each output voltage is sensed by a regulator that controls switching rectifiers to supply the current needed to satisfy the electric power demand of the loads connected to each output. After both output load demands are satisfied, the regulator switches off the alternator field. When power demand from either load rises, the alternator field is switched on along with the respective switching rectifier to satisfy the power demand. The output voltage grounds and control signals may be electrically isolated from each other.

Abstract: A cross current compensation system for controlling reactive currents in a generator is provided. A control system for receives voltage feedback from a first generator of a plurality of generators and cross current feedback from at least a second generator of the plurality of generators. The control system determines a phase angle based on the voltage feedback from the first generator and cross current feedback from the at least a second generator. The control system determines a compensation signal corresponding to the phase angle and cross current feedback. The control system modifying a generator excitation signal for the first generator based on the respective compensation signal and a bi-linear transformation technique.

Abstract: A control apparatus for a synchronous generator system has: a voltage instruction generator for generating voltage instructions (Vu*, Vv*, Vw*) based on an output power reference (P*) of the synchronous generator, currents (Iu, Iv) flowing through the synchronous generator and position information (&thgr;0, &ohgr;r) of magnetic poles of the synchronous generator; a zero crossing point detector for detecting a point that the voltage (Vu) of the synchronous generator passes through zero volt.; and a magnetic pole position calculator for calculating the information (&thgr;0, &ohgr;r) on the position of magnetic poles of the synchronous generator on the basis of the voltage instruction (Vu*) and the power reference (P*) when the synchronous generator is under the generation mode, and on the basis of an output signal of the zero crossing point detector when the synchronous generator is under the stand-by mode.

Abstract: A generator transfer function regulator incorporating two control loops. The first control loop produces a first generator excitation control signal (U) which varies to compensate for variations in the magnitude of the generator output voltage (V.sub.1) . The second generator loop produces a second generator excitation control signal (U.sub.e) which varies so as to maintain substantially constant the response of the generator system to variations in the generator output. The two control signals are combined and applied to a conventional generator exciter circuit (2). As a result, the generator terminal voltage (V.sub.1) control performance achieved by the AVR under open circuit conditions is effectively maintained when the generator is loaded over its range of operation, irrespective of the power system which the generator feeds.

Abstract: An alternator having a sensorless power angle control includes a three phase stator winding and three stator winding outputs connected to a controlled full wave rectifier bridge with a dc output. The controlled full wave rectifier bridge includes upper MOSFET switches and lower MOSFET switches with body diodes. Operation of the alternator results in a three phase back EMF generated in the stator windings and phase voltages across each of the stator windings. The output of the alternator is increased by introducing a phase shift between the back EMF and the phase voltages, resulting in an optimized power angle. In order to provide a reference for the phase of the back EMF, a zero crossing detector is provided which monitors the zero voltage crossings across the body diodes of the lower MOSFET switches. The negative to positive zero voltage crossings across the body diodes of the lower MOSFET devices correspond to the negative to positive zero crossings of the three phase back EMF.

Abstract: An automatic load distributing apparatus for generators is of simple construction and occupies a small space and can automatically distribute loads evenly on respective engines upon parallel load operation of generators of different capacities and provide labor saving of operation. The automatic load distributing apparatus for generators comprises a plurality of engines for driving a plurality of generators connected in parallel to a common load, a plurality of fuel injection pumps and a plurality of load distributing units for distributing outputs corresponding to the load to the engines.

Abstract: A power conversion system allows for redundant starting and generating functions together with fault tolerant operation through the multiple use of power conversion equipment.

Abstract: A power conversion system allows for redundant starting and generating functions and eliminates equipment normally found in a conventional system so that size and weight are reduced.

Abstract: A system (30) for providing electrical-power to remote communities (34) widely distributed over an extended geographical area (38) includes a generating station (32) located proximate each of the communities, each generating station supplying only that community to which it is proximate. The generating stations are in electronic communication with a central computer (40). Each generating station includes a plurality of generators (54-56). Each of the generators is controlled by a microprocessor based controller (64). Each controller is arranged to operate the generating station cooperatively with the other controllers associated with other generators in the station, and to assume a supervisory role in doing so by a mutual arbitration procedure among the controllers. Each controller is also arranged to monitor important generator operating parameters and to communicate these parameters to the central computer.

Abstract: An engine-driven alternator assembly includes an output winding having an internal impedance characteristic similar to a separate stationary ballast for high intensity discharge lamps. The output winding is direct connected to lamps in a mobile light tower application having four HID lamps. The alternator assembly includes four separate alternator units each having an output winding wound to establish the inherent internal impedance to provide a ballast source for the connected lamp. Each alternator unit has its rotor mounted on a common shaft connected to the shaft of the engine. Each alternator unit establishes an open circuit voltage to strike an arc across the HID lamp and then a sustaining voltage to maintain current flow as well as limiting the current to the lamp. The alternator unit has a high frequency output, preferably within 200 to 600 hertz. The alternator unit is a permanent magnet alternator, a switched reluctance alternator, an induction alternator, or a wound synchronous alternator.

Abstract: In one embodiment of the present invention, an electrical generating system for a motor vehicle includes a first alternator and a second alternator. The first alternator includes a first plurality of electrical power output windings, a first field winding in electromagnetic communication with the first plurality of electrical power output windings and a voltage regulator. The voltage regulator further includes an electrical driver coupled to the first field winding to control a current through the first field winding. The second alternator includes a second alternator further including a second plurality of electrical power output windings and a second field winding in electromagnetic communication with the second plurality of electrical power output windings. The said second field winding is coupled to the electrical driver for control of electrical current through the second field winding by the electrical driver.

Abstract: A system (30) for providing electrical-power to remote communities (34) widely distributed over an extended geographical area (38) includes a generating station (32) located proximate each of the communities, each generating station supplying only that community to which it is proximate. The generating stations are in electronic communication with a central computer (40). Each generating station includes a plurality of generators (54-56). Each of the generators is controlled by a microprocessor based controller (64). Each controller is arranged to operate the generating station cooperatively with the other controllers associated with other generators in the station, and to assume a supervisory role in doing so by a mutual arbitration procedure among the controllers. Each controller is also arranged to monitor important generator operating parameters and to communicate these parameters to the central computer.

Abstract: A system (30) for providing electrical-power to remote communities (34) widely distributed over an extended geographical area (38) includes a generating station (32) located proximate each of the communities, each generating station supplying only that community to which it is proximate. The generating stations are in electronic communication with a central computer (40). Each generating station includes a plurality of generators (54-56). Each of the generators is controlled by a microprocessor based controller (64). Each controller is arranged to operate the generating station cooperatively with the other controllers associated with other generators in the station, and to assume a supervisory role in doing so by a mutual arbitration procedure among the controllers. Each controller is also arranged to monitor important generator operating parameters and to communicate these parameters to the central computer.

Abstract: Two or more alternators--each typically of an economical cost and of any mixture of types and capacities--are turned by a single motive power source--normally the engine of a large commercial truck or bus. The several alternators are electrically connected in tandem-parallel across a battery/load. A corresponding number of electronic voltage regulators, preferably of the type described in patent application Ser. No. 08/645,611, respectively individually control the alternators. One electronic voltage regulator that is modified to become a designated master produces a "universal" control signal in response to variations in a voltage across the battery/load. This "universal" control signal is further used in the master electronic voltage regulator itself to develop a conventional signal providing regulation to an associated alternator.

Abstract: A highly reliable control system for AC generator capable of reducing such adverse effects as belt slippage or a drop in engine rpm's of a vehicle due to an abruptly increased torque of the AC generator.

Abstract: A mobile AC power source is described for generating AC electrical power that is powered by any rotational energy source such as a vehicle engine. The output of the mobile generator is sinusoidal but could have other shapes as well and is stable with variations in load and engine RPM. The AC output can vary in voltage from approximately 100 to 500 VAC RMS and in frequency from approximately 40 to 400 Hz. The mobile AC power source employs an alternator driven by the vehicle engine or any other rotational source and incorporates two stator windings and one rotor, or two stators, four windings and two rotors on a common shaft. The stator windings are insulated electrically from each other. AC output voltage is held constant by using the voltage produced by the alternator as feedback and controlling the alternator rotor current. A voltage step up circuit boosts the voltage from the alternator if it is below a threshold value as occurs at low engine RPM.

Abstract: A highly reliable and low cost power supply unit for vehicles is provided which allows the control operation of a high voltage load controller to be carried out easily. When electric power is supplied from a generator 1A to a high voltage load 5, a change-over relay 4A is switched so that a battery 6a is connected to the high voltage load 5 to excite a field winding 12 of the generator. A first diode 21 and a second diode 22 are provided so that when the electric power generated by the generator the current generated by the generator is prevented from flowing into a vehicle system voltage load 6 including a battery 6a.

Abstract: An electrical supply system with two power generators and several items of electrical equipment has a processor that controls disconnection of the equipment if demand should exceed supply. The processor has a hardware switch controlled by outputs from the generators. The processor runs two different programs at the same time but the switch supplies only one of these to the output. When equipment needs to be disconnected, the switch changes to supply the results of the other program to the output and this effects the disconnection. When sufficient supply is restored, the switch changes back to its original state to supply the results of the first program to the output of the processor.

Abstract: A method of producing electrical energy from rotary motion of an axle of a vehicle utilizes a generator assembly including a generator coupled to the axle. The method includes determining the rate of rotation of the axle, carrying out the electrical energy production as well as the determination of the rate of rotation exclusively through the generator, and evaluating pulse parameters of each induced electrical voltage pattern for the determination of the rate of rotation. The generator assembly includes a rotor coupled to the axle and permanent magnets mounted on the rotor distributed over the circumference thereof. The permanent magnets have radially extending polar axes. A stator includes induction coils mounted coaxially around the circumference of the rotor. An air gap is defined between the stator and the rotor.

Abstract: An apparatus for powering a unipolar motor may include a solid oxide fuel cell having a plurality of sub-modules, a unipolar generator having a plurality of armature turns, and a plurality of jumpers. Each of the sub-modules may produce fuel cell electric power at the fuel cell terminals. Each of the armature turns may produce generator electric power at the generator terminals. The jumpers may interconnect the fuel cell terminals with the generator terminals in order to provide a configurable voltage-current profile for the unipolar motor. The fuel cell may have a fuel cell housing and the generator may have a generator housing. The fuel cell terminals may be located outside of the fuel cell housing and the generator terminals may be located outside of the generator housing. Each of the sub-modules and each of the armature turns may produce a voltage. The jumpers may interconnect the fuel cell terminals in series with the generator terminals in order to sum the voltages for the unipolar motor.

Abstract: A control device for a battery charging AC generator for a motor vehicle including a power transistor connected in series with a field winding of the AC generator for performing switching control of a current flowing through the field winding. A voltage deviation circuit detects a deviation of the battery voltage from a reference voltage; and a PWM signal generating circuit is responsive to a voltage deviation signal from the voltage deviation circuit for turning the power transister on and off a resistor connected in series with the power transistor detects a current flowing through the field winding; and a current limiting circuit generates a turn off signal for the power transistor when the detected current is determined to have exceeded a reference current. A latch circuit operates in response to a clock signal from the PWM signal generating circuit to limit the frequency of turning on and off of the power transistor to below 1 KHz.

Abstract: Regulator circuitry for connection to field coils of an alternator in an electrical system of a vehicle having a system voltage maintained by the alternator includes circuitry for providing a variable drive to the field coils of the alternator, and circuitry for generating a velocity signal related to a rotational velocity of a driven shaft of the alternator. The regulator circuitry also includes circuitry for producing a deviation signal when the system voltage deviates more than a predetermined amount from a predetermined value, and circuitry responsive to the deviation signal to vary the field coil drive to the alternator at a rate dependent upon the velocity signal. In addition a method is presented for regulating the voltage delivered by an alternator in an electrical system having a system voltage maintained by the alternator.

Abstract: Prior power generation systems generated output voltages having relatively large, undesirable overvoltage transients due sudden load reduction. In order to overcome this disadvantage, a power generation system for generating a DC bus voltage on a DC bus is provided with a switch coupled across the DC bus to suppress overvoltage transients. The power generation system includes a synchronous generator that generates AC power and a rectifier that rectifies the AC power to produce DC power and supply the DC power to the DC bus. A voltage regulator controls magnitude of the DC bus voltage by varying the amount of current provided to a field winding associated with the synchronous generator. A switch is coupled across the DC bus and is repeatedly switched when the DC bus voltage reaches a predetermined magnitude. When the switch is in operation, the voltage regulator controls the DC bus voltage based upon an emulated voltage generated by a voltage emulator.

Abstract: A voltage regulator for an aircraft d.c. power supply in which the gain of the voltage regulator varies as a function of d.c. load current and a.c. generator speed. In addition, in a preferred embodiment of the invention, low noise lead compensation is provided by a network which models the system response to changing load currents. It predicts the change in d.c. voltage which would occur in response to load current changes and provides regulator lead compensation.

Abstract: Pulsations in an electrical parameter on the output of a synchronous generator powered by a Diesel engine at a frequency which differs from that of the synchronous generator's natural frequency are smoothed out, whereby, a controlled variable (X) corresponding to the pulsation is tapped from the stage formed by the Diesel engine (5), the generator (3), and the network (4). From this controlled variable (X) and a reference input (W), a control difference (.DELTA.) is calculated, by means of which a correcting variable (y) is set in the stage indicated for the purpose of control.

Abstract: This invention relates to a power system stabilizing apparatus for a synchronous generator, which comprises two power system stabilizers for raising the stability of an electric power system. The characteristics of one stabilizer is preset so as to increase the braking power in the same way as in a conventional power system stabilizing apparatus, while the other one being preset so as to increase the synchronizing power, so that phase compensation elements of both power system stabilizers can be varied in accordance with the drift amount of the generator such as the revolution deviation of the rotor thereof, the output deviation thereof, the frequency deviation of the terminal voltage thereof, etc. thereby realizing high static and transient stability.

Abstract: A control apparatus for a vehicular generator for use in an automobile, etc., in which the temperature of the generator is detected so as to control switching of the field current of the generator when the temperature of the generator is below a predetermined value, so that the cold output current and cold drive torque of the generator are substantially the same as the hot output current and hot drive torque of the generator.

Abstract: An excitation control apparatus for a rotary electric machine according to this invention is such that principal portions of an automatic voltage regulator are dualized by effectively combining circuits preferring decrease of a field current and circuits preferring increase of the field current, thereby to enhance the reliability of the apparatus. The circuits preferring the decrease of the field current when the ignition phase of a thyristor circuit advances precede the circuits preferring the increase of the field current, so that an excitation system is normally operated even in cases of the damages or abnormalities of any internal component, etc.

Abstract: A charging system control system includes a microcomputer for determining the most proper voltage regulator reference value setting according to input data received thereby, and controls a clutch and a speed change gear disposed between the engine and the charging generator so as to operate the generator within an optimum r.p.m. range. The microcomputer further performs fault detection on the basis of charging system data input thereto and effects display of the detection results by means of a display unit.

Abstract: A charge control microcomputer is provided for a vehicle charging system to control the reference voltage employed by the voltage regulator so that a suitable battery charging voltage is generated at all times. The microcomputer processes charging system data such as the battery output voltage, the generator output current, etc., and at least one engine parameter from an engine control microcomputer to derive the most suitable reference voltage for the voltage regulator.

Abstract: A charging control system includes a clutch interposed between the generator and the engine, and a microcomputer for receiving input data and determining a suitable reference voltage for the system voltage regulator, and a suitable engagement state of the clutch, in order to drive the generator in an optimum r.p.m. range at all times. The microcomputer may also be used for detecting faults in the charging system, and displaying the detected results on a display unit.

Abstract: The present invention relates to a charging generator control system comprising a generator which includes a field winding, and an armature winding being in three-phase connection to generate an A.C. output; a rectifier which rectifies the A.C. output from said armature winding of said generator; a battery which is charged with a D.C. output from said rectifier and which can supply an exciting current to said field winding; a separately-exciting power source which generates a D.C.

Abstract: Desynchronization of a synchronous machine is predicted by detecting a phenomenon of radical variation of the magnetic flux in the gap of a synchronous machine immediately before falling into an asynchronous state. For example, each functional value of the direct axis flux and the quadrature axis flux in the gap is detected for comparing the variation of each functional value with a predetermined reference level to predict desynchronization of the synchronous machine.

Abstract: A shaft torsional oscillation signal of a rotatable torsional system including a rotor of a synchronous machine, at least one rotatable body and a shaft coupling the synchronous machine and the rotatable body, is detected. The shaft torsional oscillation signal with a specific frequency is made to advance the phase thereof by a stabilizing control device. The field voltage of the synchronous machine is so controlled that a sub-synchronous resonance (SSR) of the rotatable torsional system caused by the specific frequency is restrictedly controlled by the shaft torsional signal of the specific frequency phase-advanced.

Abstract: Voltage, current and field voltage of a generator connected to an electric power system are sampled at a predetermined period for analog-digital conversion and then led to a digital computer. In addition to computation for AVR, the computer computes from its input the generator output power, and also monitors the occurrence of a fault, the removal of the fault and variation in the generator output in the system. After the occurrence of a fault, the field excitation of the generator is intensified until the generator output power reaches substantially a peak value, but after the peak value is substantially passed by, the excitation is conversely depressed to a value below the level which is present before the fault occurs. When the generator output power recovers the value which is present before the fault occurs, the computer returns to deliver the AVR output.

Abstract: The field excitation flux of the synchronous generator is controlled in response to the summing rotor angle signal of a predetermined set signal and of a rotor angle signal representing a phase difference between the voltage equivalent to an infinite bus voltage and the output voltage from the pilot generator provided on the same rotating shaft as the synchronous generator.