Speed Or Frequency Of Generator Patents (Class 322/29)
  • Patent number: 10224720
    Abstract: A combined power plant is disclosed for feeding energy into a non-local power network. The combined power plant includes at least one turbine power plant and at least one energy storage installation with one or more energy storage modules, whereby the turbine power plant is connected to the non-local power network in order to feed in power. A monitoring unit monitors the rotational speed of a turbine on the basis of a rotational speed-specific characteristic quantity, at least while the energy is being fed into the non-local power network. The energy storage installation is connected to the non-local power network separately or via the turbine power plant, whereby the monitoring unit is connected to a control unit of the appertaining energy storage installation in order to transmit a characteristic quantity signal based on the rotational speed-specific characteristic quantity to the control unit via a data connection.
    Type: Grant
    Filed: June 20, 2014
    Date of Patent: March 5, 2019
    Assignee: ENRICHMENT TECHNOLOGY COMPANY LTD. ZWEIGNIEDERLASSUNG DEUTSCHLAND
    Inventors: Rainer vor dem Esche, Christoph Treppmann
  • Patent number: 10106027
    Abstract: A compact generator and coolant pump assembly may be used on a vehicle having a fluid reservoir and a plurality of electrical components disposed on the vehicle. The generator includes a rotor and stator disposed in a housing and the rotor is driven by a rotatable input member to generate an electrical output for use by one or more components of the vehicle. The assembly also includes a circulating pump connected to the generator housing and driven by the rotatable input member. The circulating pump may be connected to a fluid reservoir and to one or more electrical components such as a controller or battery on the vehicle through a set of coolant lines to provide coolant to the electrical components. The circulating pump may be offset from the generator housing by a plurality of spacers.
    Type: Grant
    Filed: June 1, 2016
    Date of Patent: October 23, 2018
    Assignee: Hydro-Gear Limited Partnership
    Inventor: Scott W. Keller
  • Patent number: 9945907
    Abstract: A method of determining a fault condition in a synchronous machine. The method includes a) obtaining a field current signal and a shaft voltage signal of the synchronous machine, b) transforming the field current signal and the shaft voltage signal to obtain a field current frequency spectrum and a shaft voltage frequency spectrum, and c) determining whether a fault condition is present, and in case a fault condition is present identifying a type of the fault condition, based on harmonic content of the field current frequency spectrum and harmonic content of the shaft voltage frequency spectrum, wherein c) includes comparing the harmonic content of the field current frequency spectrum with fault condition field current signature spectra and comparing the harmonic content of the shaft voltage frequency spectrum with fault condition shaft voltage signature spectra.
    Type: Grant
    Filed: March 4, 2015
    Date of Patent: April 17, 2018
    Assignee: ABB Schweiz AG
    Inventors: Pedro Rodriguez, Subrat Sahoo
  • Patent number: 9915243
    Abstract: A system for automatic generation control in a wind farm is provided. The system includes a wind farm controller for controlling the plurality of energy storage elements. The wind farm controller receives an automatic generation control set point from an independent system operator, generates a farm-level storage power set point for the wind farm based on the automatic generation control set point, generates individual storage power set points for the plurality of energy storage elements based on states of charge of the respective energy storage elements, and controls the plurality of energy storage elements based on the individual storage power set points for dispatching storage power to perform automatic generation control.
    Type: Grant
    Filed: February 18, 2015
    Date of Patent: March 13, 2018
    Assignee: GENERAL ELECTRIC COMPANY
    Inventors: Deepak Raj Sagi, Mark Edward Cardinal, Avijit Saha, Rajni Kant Burra, Govardhan Ganireddy
  • Patent number: 9874190
    Abstract: Methods and systems for exercising a genset are disclosed herein. The method includes detecting whether the genset is in a first mode or a second mode, and activating a plurality of exercise cycles of the genset. Activating the plurality of exercise cycles comprises, in response to detecting the genset is in the first mode, ignite fuel to activate the genset during each of the plurality of exercise cycles of the genset; and in response to detecting the genset is in the second mode, cranking the genset without igniting fuel during at least a first subset of the plurality of exercise cycles.
    Type: Grant
    Filed: January 26, 2016
    Date of Patent: January 23, 2018
    Assignee: Cummins Power Generation IP, Inc.
    Inventors: Dan G. Priem, Leo T. Steffl
  • Patent number: 9843280
    Abstract: A motor control system is provided for field-oriented control of an electric motor for driving a vehicle. The motor control system includes a current setpoint creator, which is designed to receive a torque setpoint as an input signal and to output a torque-creating current setpoint and at least one field-creating current setpoint as output signals in order to control the electric motor in a field-oriented manner. An exceptional situation detection device detects a present torque setpoint, calculates a change based on the present torque setpoint and an earlier torque setpoint, and detects an exceptional situation if the magnitude of the change exceeds a specified threshold value. The motor control system is designed to adapt the torque-creating current setpoint based on the present torque setpoint when the exceptional situation is detected, thereby bypassing the current setpoint creator.
    Type: Grant
    Filed: October 4, 2013
    Date of Patent: December 12, 2017
    Assignee: CONTINENTAL AUTOMOTIVE GMBH
    Inventor: Thomas Baumann
  • Patent number: 9577558
    Abstract: A power management system having automatic calibration is disclosed. The power management system may have an alternator and an electronic control unit. The electronic control unit may be configured to determine a reference voltage based on at least one measured operating condition of the alternator. The reference voltage may correspond to an overloading threshold of the alternator. The electronic control unit may be further configured to monitor a voltage of the alternator and, when the monitored voltage is less than the reference voltage, perform a corrective action to increase a power output of the alternator.
    Type: Grant
    Filed: July 3, 2014
    Date of Patent: February 21, 2017
    Assignee: Caterpillar Inc.
    Inventors: Michael James Kresca, Brett Michael Nee, Matthew J. Urbanc
  • Patent number: 9570913
    Abstract: A generator for producing electric power, the generator including a generator unit including a stator) and a rotatably supported rotor, wherein the stator includes a first set of windings and a second set of windings, and the rotor is adapted to induce electrical voltage in the first set of windings and in the second set of windings when the rotor is rotated relative to the stator, the generator further includes a first converter coupled to the first set of windings, the first converter being adapted to convert alternating voltage in the first set of windings into an output DC voltage, a DC output coupled to the first converter to receive the output DC voltage, and a second converter coupled to the second set of windings and to the DC output, the second converter being adapted to generate control voltages and/or control currents in the second set of windings, is provided.
    Type: Grant
    Filed: March 18, 2015
    Date of Patent: February 14, 2017
    Assignee: Siemens Aktiengesellschaft
    Inventors: Björn Andresen, Jesper Elliot Petersen, Arwyn Thomas, Zhan-Yuan Wu, Zhen Ping Xia
  • Patent number: 9391444
    Abstract: Voltage instability protection for an electric power system is implemented by determining a change in power injected into a region of interest within the electric power system based on synchronized power measurements from different power injection points of the region of interest, and by determining a change in power absorbed by one or more loads in the region of interest based on synchronized power measurements from different load points of the region of interest. A change in power loss for the region of interest is determined based on the difference between the change in power injected into the region of interest and the change in power absorbed by the region of interest. A voltage instability condition is indicated when the change in power loss for the region of interest approximates the change in power injected into the region of interest.
    Type: Grant
    Filed: December 13, 2012
    Date of Patent: July 12, 2016
    Assignee: ABB RESEARCH LTD.
    Inventors: Mahyar Zarghami, Reynaldo Nuqui
  • Patent number: 9184582
    Abstract: Method for operating a fail operational power system for a vehicle includes monitoring a first voltage on a first power distribution path and a second voltage on a second power distribution path. An isolator switch controllably operative between open and closed states is monitored. The closed state connects the first and second power distribution paths and the open state opens the connection between the first and second power distribution paths. Each of the monitored first and second voltages is compared to a reference voltage. When a predetermined operating mode requiring fail operational power is enabled, the isolator switch is controlled to the open state when at least one of the monitored first and second voltages violates the reference voltage and the isolator switch is controlled to the closed state when neither one of the monitored first and second voltages violates the reference voltage.
    Type: Grant
    Filed: September 3, 2013
    Date of Patent: November 10, 2015
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: David P. Koch, Chandra S. Namuduri, Jeffrey James Hoorn, Nikhil L. Hoskeri, Mark S. Hoinka
  • Patent number: 9160251
    Abstract: In a rotary electric machine, an on-timing setter sets on-timings of each of a high-side switching element and a low-side switching element for each of at least two three-phase stator windings. An off-timing setter sets off-timings of each of the high-side switching element and the low-side switching element. An off-timing fault determiner determines a fault of an off-timing of a target switching element as one of the high-side switching element and the low-side switching element set by the off-timing setter when a time interval from the off-timing of the target switching element set by the off-timing setter to time when a phase voltage corresponding to the target switching element reaches a threshold after the off-timing thereof is shorter than a preset value.
    Type: Grant
    Filed: September 28, 2011
    Date of Patent: October 13, 2015
    Assignee: DENSO CORPORATION
    Inventors: Harumi Horihata, Hideaki Nakayama
  • Patent number: 9143071
    Abstract: The present invention concerns a method of controlling a wind power installation having a generator with a stator, a pole wheel with at least two rotor poles with a respective pole winding for producing a magnetic field guided in the respective rotor pole, and an air gap between the stator and the pole wheel, including the steps—controlling a respective exciter current through each pole winding,—varying at least one of the exciter currents relative to at least one further one of the exciter currents, and/or—varying at least one of the exciter currents in dependence on the position of the pole wheel in relation to the stator.
    Type: Grant
    Filed: May 24, 2012
    Date of Patent: September 22, 2015
    Assignee: Wobben Properties GmbH
    Inventor: Volker Diedrichs
  • Patent number: 9073444
    Abstract: A battery charging system for a vehicle, capable of charging a vehicle battery pack properly in a short time even during driving a vehicle-mounted electrical load. The battery charging system includes the battery pack mounted in the vehicle, the vehicle-mounted electrical load that can be driven by a current from the battery pack, and a battery charge controller that controls charging of the battery pack. When the battery pack is charged by using an external battery charger during operation of the load, the battery charge controller requires the external battery charger to supply a sum current that is a sum of a current for charging the battery pack and a current for driving the load to the vehicle.
    Type: Grant
    Filed: June 26, 2012
    Date of Patent: July 7, 2015
    Assignees: DENSO CORPORATION, CAPTEX CO., LTD.
    Inventors: Akira Ito, Mitsuru Fujita, Shinji Katoh, Kenichi Tanaka, Yukitsugu Sakaguchi
  • Publication number: 20150102783
    Abstract: Some embodiments relate to a method of controlling speed of a variable speed generator. The method includes detecting a load of the variable speed generator and determining a target speed for the variable speed generator based on the load supplied by the variable speed generator. The method further includes using a controller to adjust the speed of the variable speed generator based on the target speed. The method may further include correcting the target speed by calculating a correction factor that corrects the target speed based on a voltage produced by the variable speed generator.
    Type: Application
    Filed: December 20, 2014
    Publication date: April 16, 2015
    Inventors: Isaac S. Frampton, Eric D. Albsmeier
  • Patent number: 8975878
    Abstract: A method of controlling a generator (110) of an electric drive (104) associated with an engine (102) is provided. The method may determine an operational state of the electric drive (104) based on a speed of the engine (102), and selectively engage one of a map-lookup control scheme (150) and a fixed-theta off control scheme (152) for operating the generator (110) based on the operational state of the electric drive (104).
    Type: Grant
    Filed: December 23, 2010
    Date of Patent: March 10, 2015
    Assignee: Caterpillar Inc.
    Inventors: Jackson Wai, Thuong Le, Adam Braun, Jesse Gerdes, James Siegle, Mark Hartman
  • Patent number: 8963508
    Abstract: Some embodiments relate to a method of controlling speed of a variable speed generator. The method includes detecting a load of the variable speed generator and determining a target speed for the variable speed generator based on the load supplied by the variable speed generator. The method further includes using a controller to adjust the speed of the variable speed generator based on the target speed. The method may further include correcting the target speed by calculating a correction factor that corrects the target speed based on a voltage produced by the variable speed generator.
    Type: Grant
    Filed: April 19, 2012
    Date of Patent: February 24, 2015
    Assignee: Kohler Co.
    Inventors: Isaac S. Frampton, Eric D. Albsmeier
  • Publication number: 20150048806
    Abstract: A method for operating a separately excited electric machine, in particular, a generator of a motor vehicle, where an exciting current flows through a rotor winding of the electric machine at a nominal current intensity during a normal operation and at a holding current intensity in an idling operation; the holding current intensity being greater than zero and less than the nominal current intensity.
    Type: Application
    Filed: November 13, 2012
    Publication date: February 19, 2015
    Inventor: Istvan Deak
  • Patent number: 8957536
    Abstract: A wind turbine is provided. The wind turbine includes a generator, an output thereof being connectable to a power grid via a power transmission path, the power transmission path comprising a generator side converter coupled to the output of the generator, a grid side converter coupled to the power grid, and a DC link coupled between the generator side converter and the grid side converter. For diverting the generator power, a load dump arrangement is provided which includes at least one resistor, a plurality of switches, and a plurality of electrical connections which electrically connect the at least one resistor to the output of the generator and across the DC link via the plurality of switches. One common and configurable load dump is used for both converter system failures and grid failures. As compared to two separate load dumps for converter failures and grid failures, the single load dump will require a smaller space for a wind turbine.
    Type: Grant
    Filed: December 27, 2012
    Date of Patent: February 17, 2015
    Assignee: Vestas Wind Systems A/S
    Inventors: Amit Kumar Gupta, Anshuman Tripathi, Ramasamy Anbarasu, Ove Styhm, Gil Lampong Opina, Jr., Yugarajan Karuppanan, Bing Li, Shu Yu Cao
  • Publication number: 20150035501
    Abstract: A method for controlling torsional oscillation includes detecting angular position of a wound field synchronous generator machine, extracting information indicative of torsional oscillation, selecting synchronous torsional oscillations, compensating for the synchronous torsional oscillations with an exciter signal, and controlling field current in the wound field synchronous generator using the exciter signal. A damping controller includes a damping module with a synchronous selective compensator and a synchronous notch filter for generating torsional oscillation compensation signals for asynchronous torsional oscillation.
    Type: Application
    Filed: August 2, 2013
    Publication date: February 5, 2015
    Applicant: HAMILTON SUNDSTRAND CORPORATION
    Inventors: Gregory I. Rozman, Steven J. Moss
  • Patent number: 8928166
    Abstract: An electric power generation system (EPGS) employs both a wild-source generator and a variable and/or constant frequency generator. The wild-source generator is coupled to receive mechanical power from a low-pressure spool on an aircraft engine and to generate in response a wild-source output for consumption by voltage and frequency-tolerant loads. The variable and/or constant frequency generator is coupled to receive mechanical power from a high-pressure spool on the aircraft engine and to generate in response a variable and/or constant frequency output for consumption by voltage and frequency-intolerant loads.
    Type: Grant
    Filed: August 31, 2011
    Date of Patent: January 6, 2015
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Mark J. Seger, Todd A. Spierling, David S. Behling, Craig R. LeGros, Brandon M. Grell
  • Patent number: 8928293
    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.
    Type: Grant
    Filed: August 2, 2013
    Date of Patent: January 6, 2015
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Gregory I. Rozman, Jacek F. Gieras, Steven J. Moss
  • Patent number: 8907636
    Abstract: The present invention provides a method and a device for primary frequency regulation based on bang-bang control, the method comprises: obtaining in real-time a power grid frequency of a steam turbine generator set; performing a subtraction operation on a rated power grid frequency and said power grid frequency to generate a power grid frequency difference; performing a dead zone process on the power grid frequency difference according to a dead zone fixed value to generate a frequency difference; performing a frequency difference compensation operation on the frequency difference to generate a frequency difference compensation instruction; and combining an original primary frequency regulation output instruction with the frequency difference compensation instruction and outputting the result to a steam turbine speed regulation system when a selecting switch is 1.
    Type: Grant
    Filed: April 19, 2013
    Date of Patent: December 9, 2014
    Assignees: North China Electric Power Research Institute Co. Ltd., State Grid Corporation of China
    Inventors: Weihua Li, Zhenyong Yang, Aiguo Gao, Yi Luo, Liankun Lai, Feiyi Li, Yanjin Wang
  • Patent number: 8903555
    Abstract: A wind power generator generates power through a rotation of a rotor and is interconnected, and operated with its power generation output previously limited in order to be able to further supply the power to a power system in response to a decrease in system frequency. Thus, a concentrated control system derives a required restricted amount corresponding to a power generation output required to respond to the decrease in system frequency, derives a value by subtracting an amount corresponding to a latent power generation output with which the power generation output can be increased, from the required restricted amount, and sets a restricted amount of the power generation output in each wind power generator to perform the operation with the power generation output previously limited to respond to the decrease in system frequency, based on the above value.
    Type: Grant
    Filed: March 14, 2012
    Date of Patent: December 2, 2014
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Takumi Nakashima, Masayuki Hashimoto, Akira Yasugi, Tsuyoshi Wakasa, Hisanobu Shinoda
  • Patent number: 8823334
    Abstract: A method for starting an electric motor, the motor having a main machine, exciter, and permanent magnet generator (PMG), each having a stator and a rotor, with each rotor mounted to a common shaft, the method comprising starting the main machine in an asynchronous mode by applying a starting current to the stator of the main machine to induce a damper current in a damper winding of the main rotor to generate a starting torque that initiates the rotation of the common shaft, and then running the main machine in synchronous mode by supplying running current from the exciter rotor to the main machine rotor.
    Type: Grant
    Filed: October 31, 2012
    Date of Patent: September 2, 2014
    Assignee: GE Aviation Systems LLC
    Inventors: Hao Huang, Xiaochuan Jia
  • Patent number: 8803487
    Abstract: A rotating device for multi-megawatt, fast response frequency regulation for the electric grid. The device generally has a main shaft coupled to a motor-generator, a main spring concentric to the main shaft, and several radially-symmetric arms, each connected to the main spring via a four-bar mechanism. As the rotational speed of the device increases, centrifugal force acting on the arms causes them to rise, the four-bar mechanism compresses the main spring, and energy is stored in the device as a combination of kinetic rotational energy, elastic potential energy, and gravitational potential energy. The device can be configured with additional springs, which can be compression springs, tension springs, or a combination thereof, in order to increase the amount of energy produced. Symmetrically-spaced gliding masses can be arranged on the arms as well.
    Type: Grant
    Filed: September 1, 2012
    Date of Patent: August 12, 2014
    Assignee: Dehlsen Associates, LLC
    Inventors: James G. P. Dehlsen, Mauricio Quintana
  • Patent number: 8786262
    Abstract: One embodiment of the present invention is a unique method of controlling the output of a synchronous electrical machine. Another embodiment is a unique method of controlling the output of a synchronous electrical machine for powering a load. Still another embodiment is a unique aircraft power generation system. Other embodiments include apparatuses, systems, devices, hardware, methods, and combinations for fluid driven actuation systems. Further embodiments, forms, features, aspects, benefits, and advantages of the present application will become apparent from the description and figures provided herewith.
    Type: Grant
    Filed: July 25, 2011
    Date of Patent: July 22, 2014
    Assignee: Rolls-Royce Corporation
    Inventors: Kaushik Rajashekara, John Timothy Alt
  • Patent number: 8624543
    Abstract: A method of controlling a motor is provided. The method may determine a speed of the motor, and engage a soft chopping routine on a first switch and a second switch of each phase if the motor speed is relatively low. The first switch may be driven by a first pulse width modulated PWM signal and the second switch being driven by a second PWM signal. The first and second PWM signals may be alternatingly configured such that at least one of the first switch and the second switch is closed at any point during the distributed soft chopping routine and both the first switch and the second switch are never simultaneously open.
    Type: Grant
    Filed: December 9, 2011
    Date of Patent: January 7, 2014
    Assignee: Caterpillar Inc.
    Inventors: Ahmed Khalil, Jackson Wai, Jesse Gerdes, James Siegle, Mark Hartman, Joshua Williams
  • Publication number: 20130278228
    Abstract: Some embodiments relate to a method of controlling speed of a variable speed generator. The method includes detecting a load of the variable speed generator and determining a target speed for the variable speed generator based on the load supplied by the variable speed generator. The method further includes using a controller to adjust the speed of the variable speed generator based on the target speed. The method may further include correcting the target speed by calculating a correction factor that corrects the target speed based on a voltage produced by the variable speed generator.
    Type: Application
    Filed: April 19, 2012
    Publication date: October 24, 2013
    Applicant: Kohler Co.
    Inventors: Isaac S. Frampton, Eric D. Albsmeier
  • Patent number: 8564255
    Abstract: A vehicle-use electric rotating machine includes a switching section having upper and lower arms each constituted of a switching element parallel-connected with a diode to rectify an AC voltage induced in each phase winding of the electric rotating machine, an on-timing setting section for setting an on timing of each of the switching elements, an off-timing setting section for setting an off timing of each of the switching elements such that, when a time period from when a phase voltage of the phase winding reaches a first threshold value to when the phase voltage reaches a second threshold value different from the first threshold value is referred to as a conduction period, a time period in electrical angle from when the switching element is turned off to when the conduction period ends is equal to a target electrical angle set depending on the rotational speed of the electric rotating machine.
    Type: Grant
    Filed: September 23, 2011
    Date of Patent: October 22, 2013
    Assignee: Denso Corporation
    Inventors: Hideaki Nakayama, Harumi Horihata
  • Publication number: 20130207391
    Abstract: A variable speed electric machine and a method for generating electric energy is provided. The electric machine includes an outer stator with a first set of field windings. Further, the electric machine includes a modulator outer rotor that is concentric and is located proximate to the outer stator. The modulator outer rotor is operatively coupled to an input shaft. Furthermore the electric machine includes a permanent magnet inner rotor concentric to the modulator outer rotor. The electric machine also includes an inner stator with a second set of field windings. The inner stator is concentric to the inner rotor and is operatively coupled to an electric grid. The outer stator, the modulator outer rotor, inner stator and the inner rotor are magnetically coupled with each other so as to maintain a constant electric frequency at the inner stator.
    Type: Application
    Filed: February 9, 2012
    Publication date: August 15, 2013
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Jan Erich Hemmelmann, Manoj Ramprasad Shah
  • Patent number: 8476871
    Abstract: The present invention relates to a method and system for controlling a doubly-fed induction machine. In operation a rotor current vector is processed with a rotor position estimate vector. A scalar error quantity is the determined in dependence upon a stator current vector and the processed rotor current vector. The scalar error quantity is integrated and an estimate of the rotor angular frequency is determined in dependence upon the integrated scalar error quantity. To obtain a rotor position estimate, the estimate of the rotor angular frequency is integrated and a rotor position estimate vector is determined in dependence upon the rotor position estimate. The rotor position estimate vector is then provided for processing the rotor current vector. As output signals a signal indicative of the rotor position estimate vector and a signal indicative of the estimate of the rotor angular frequency are provided for controlling the doubly-fed induction machine.
    Type: Grant
    Filed: November 28, 2007
    Date of Patent: July 2, 2013
    Assignee: The Royal Institution for the Advancement of Learning/McGill University
    Inventors: Boon T. Ooi, Baike Shen, Victor Low
  • Patent number: 8471407
    Abstract: An emergency power system for operation during loss of power on power mains comprises a spring-driven energy storage unit (ESU) and a generator. The ESU enters a generator mode responsive to a power outage state of a power sensor, during which mode unwinding of the spring drive powers the generator. After power is restored to the mains, a preferred embodiment automatically rewinds the spring using the generator as a motor.
    Type: Grant
    Filed: April 30, 2010
    Date of Patent: June 25, 2013
    Inventors: Thomas W. Gow, Edward L. Schwarz
  • Patent number: 8432051
    Abstract: An electric power generator for generating a substantially constant frequency output from a varying mechanical speed input such as from a wind or water turbine, comprises a three-phase induction machine in which at least one stator winding is magnetically and electrically decoupled from at least one other stator winding which is arranged to be connected to an external load, and a power source is arranged to excite said at least one stator winding with an AC current at a desired output frequency. The power generator can be directly connected to the mains grid without requiring a power electronics rectifier and inverter stage to convert the generator output to constant frequency AC.
    Type: Grant
    Filed: July 25, 2008
    Date of Patent: April 30, 2013
    Assignee: Auckland Uniservices Limited
    Inventor: Udaya Madawala
  • Patent number: 8395360
    Abstract: A method for controlling a variable speed wind turbine generator is disclosed. The generator is connected to a power converter comprising switches. The generator comprises a stator and a set of terminals connected to the stator and to the switches of the power converter. The method comprises: determining a stator flux reference value corresponding to a generator power of a desired magnitude, determining an estimated stator flux value corresponding to an actual generator power, determining a difference between the determined stator flux reference value and the estimated stator flux value, and operating said switches in correspondence to the determined stator flux reference value and the estimated stator flux value to adapt at least one stator electrical quantity to obtain said desired generator power magnitude.
    Type: Grant
    Filed: October 14, 2011
    Date of Patent: March 12, 2013
    Assignee: Vestas Wind Systems A/S
    Inventors: Anshuman Tripathi, Cao Shu Yu, Allan Holm Jörgensen, Lars Helle, Saurabh Gupta
  • Patent number: 8378643
    Abstract: It is an object to stabilize a utility grid even when an unexpected fluctuation in the frequency of the utility grid occurs. A wind turbine generator includes a rotor that rotates by wind power, a generator that is driven by rotation of the rotor, and a control device that controls a power output of the generator to increase while a rotational speed of the generator decreases when a frequency of a utility grid becomes smaller than or equal to a predetermined rated frequency and when the rotational speed of the generator is greater than or equal to a first predetermined value. In this way, even when the frequency of the utility grid fluctuates, the frequency fluctuation can be suppressed, and the utility grid can be stabilized.
    Type: Grant
    Filed: July 29, 2010
    Date of Patent: February 19, 2013
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Shinji Arinaga, Tsuyoshi Wakasa, Takatoshi Matsushita
  • Patent number: 8330431
    Abstract: A method and a wind power plant are provided for smoothing alternating electric current from a number of power generators are provided. Generators are electrically connected to an electric network. Each power generator includes a transformer with pulse width modulation for converting direct current to pulse width modulated alternating current for feeding to the network. The time for feeding the pulses of the pulse width modulated alternating current is different for each generator in order to achieve a more even alternating current as a sum of respective outputs of alternating current from the generators.
    Type: Grant
    Filed: June 7, 2011
    Date of Patent: December 11, 2012
    Assignee: Siemens Aktiengesellschaft
    Inventor: Henrik Stiesdal
  • Publication number: 20120306457
    Abstract: A powertrain system includes an electric machine mechanically coupled to an internal combustion engine mechanically coupled to a transmission. A method for operating the powertrain system includes determining an engine stall threshold rate during engine operation in a low load condition. A time-rate change in an accessory load is controlled by the electric machine operating in an electric power generating mode in response to the engine stall threshold rate during the engine operation in the low load condition.
    Type: Application
    Filed: June 2, 2011
    Publication date: December 6, 2012
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Michael D. Haggerty, Sean W. McGrogan, Adam J. Heisel
  • Publication number: 20120286523
    Abstract: A device includes a rotor and a stator with coils arranged to form a phase element. The phase element includes a first coil group including a first coil and a second coil and a second coil group including a third coil and a fourth coil, where the rotor is positioned between the first coil group and the second coil group. The device also includes one or more switches that enable reconfiguration of the phase element by switching an electrical configuration of the coils. In a first mode, the coils are arranged with the first coil in a first coil path and the second coil in a second coil path that is coupled in parallel with the first coil path. The coils are arranged such that a voltage generated across the first coil path is substantially equal to a voltage generated across the second coil path.
    Type: Application
    Filed: May 10, 2011
    Publication date: November 15, 2012
    Applicant: The Boeing Company
    Inventors: John R. Hull, John F. Gonder
  • Patent number: 8305021
    Abstract: An apparatus is disclosed for simultaneously measuring the rotational speed and/or direction of a shaft, and providing control power in accordance with the shaft rotation. The apparatus includes a permanent magnet machine (PMM) having a multipole rotor and a stator. The rotor has a plurality of permanent magnet poles and connection to the rotating shaft; the stator includes a winding and electrical connections, so that motion of the rotor with respect to the stator causes a voltage signal at the electrical connections. The apparatus also includes a circuit including a power conversion portion and a speed/direction sensing portion. The circuit receives the voltage signal from the PMM, and simultaneously outputs control power from the power conversion portion and a signal indicating the rotational speed and/or direction of the shaft from the sensing portion.
    Type: Grant
    Filed: December 15, 2009
    Date of Patent: November 6, 2012
    Assignee: Astronics Advanced Electronic Systems Corp.
    Inventor: Steven D. Meyer
  • Patent number: 8294429
    Abstract: A system and method are disclosed for regulating a generator controlled power signal. An exemplary embodiment of the system may include both a digital voltage regulator and an analog voltage regulator and a selector switch configured to switch modulation control between the digital and analog voltage regulators. A watchdog detection circuit may be included for detecting an upsetting event in the digital voltage regulator and may trigger switching of the generator excitation input voltage modulation from the digital voltage regulator to the analog voltage regulator. An exemplary embodiment of the method may include modulating the generator excitation input voltage using the digital voltage regulator, detecting an occurrence of an upsetting event in the digital voltage regulator, disabling the digital voltage regulator, and switching modulation of the generator excitation input voltage to the analog voltage regulator.
    Type: Grant
    Filed: May 22, 2009
    Date of Patent: October 23, 2012
    Assignee: Honeywell International Inc.
    Inventors: Randy Fuller, Yuan Yao
  • Patent number: 8294430
    Abstract: The invention relates to a double-fed asynchronous generator, which is provided with a slipring rotor (1b), and to a method for its operation. In the normal manner, the asynchronous generator has a machine-side converter (5) and a network-side converter (6). According to the invention, the asynchronous generator is designed to supply short-circuit power in that at least one machine-side rotor current (iRM) is maintained in the event of a short circuit, in order to allow the formation of a stator-side short-circuit current. In order that inherent short-circuit currents in sensitive components of the converters (5, 6) are nevertheless avoided, at least the machine-side rotor current (iRM) is maintained in such a way that the actual rotor current (iRMact) in the event of a short circuit is used as the new nominal value in a control apparatus for the asynchronous generator.
    Type: Grant
    Filed: July 28, 2008
    Date of Patent: October 23, 2012
    Assignee: Universitaet Kassel
    Inventor: Siegfried Heier
  • Publication number: 20120243991
    Abstract: Infinitely variable motion control (IVMC) provides motion control without any requirement for changing gears or use of a clutch. A spur gear transgear, defined as a system having an input, an output and a control, a variable pitch cam having an eccentric inner and outer cam assembly, a driver and a one-way clutch or ratchet bearing assembly may be used to form a cam controlled speed converter converting a given input to a variable or constant output speeds and further having direction control. All IVMC's, cam controlled IVMC, input compensated IVMC and pitch controlled IVMC may be utilized to form various embodiments of infinitely variable generators, transmissions and compressors/pumps.
    Type: Application
    Filed: March 21, 2012
    Publication date: September 27, 2012
    Inventor: Kyung Soo Han
  • Patent number: 8203317
    Abstract: A method for controlling an output voltage of generator arrangement includes generating a controlled field current for a field winding dependent on the output voltage and dependent on at least one control parameter that depends on a rotational speed of the generator. The method also includes decreasing a rate of change of the controlled field current with respect to an output voltage change if the rotational speed decrease.
    Type: Grant
    Filed: March 24, 2009
    Date of Patent: June 19, 2012
    Assignee: Infineon Technologies AG
    Inventors: Frank Auer, Harald Panhofer, Pierre Lefaix
  • Publication number: 20120126758
    Abstract: A DC power system includes a permanent magnet generator (PMG), and an active rectifier in electrical communication with the PMG. The active rectifier is adapted to actively rectify power output from the PMG if the PMG is operating at low speed, and the active rectifier is further adapted to passively rectify power output from the PMG if the PMG is operating at high speed.
    Type: Application
    Filed: November 19, 2010
    Publication date: May 24, 2012
    Applicant: HAMILTON SUNDSTRAND CORPORATION
    Inventors: Si J. Fang, Richard A. Himmelmann, Steven J. Moss, Gregory I. Rozman
  • Patent number: 8169197
    Abstract: A device for damping control of mechanical torsional oscillations of an electrical alternating current generator connected to a multi-phase power supply system, includes a controllable converter of an HVDC installation connected to the power supply system, a measurement and filter device for detection of a frequency-dependent signal in a frequency range of the torsional oscillations of the alternating current generator and a correction apparatus for correction of a control signal for the converter for the HVDC installation. The correction apparatus includes a single phase correction filter for correction of a phase frequency response of the frequency-dependent signal. The control signal is formed by a current nominal value of a current regulator of the converter or a triggering angle of the nominal valve and with the phase correction filter is configured to take a transfer function of the current regulator into account.
    Type: Grant
    Filed: September 7, 2006
    Date of Patent: May 1, 2012
    Assignee: Siemens Aktiengesellschaft
    Inventor: Jürgen Rittiger
  • Patent number: 8164296
    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.
    Type: Grant
    Filed: March 10, 2010
    Date of Patent: April 24, 2012
    Assignee: ABB Schweiz AG
    Inventor: John Eckerle
  • Publication number: 20120091973
    Abstract: A vehicle generator includes armature windings, rectifier module groups, an upper MOS on-timing determining section, a lower MOS on-timing determining section, a rotational speed calculating section, a target electrical angle setting section for setting a value of a target electrical angle, an upper MOS off-timing determining section, a lower MOS off-timing determining section, and drivers for driving high-side and low-side MOS transistors constituting upper and lower arms. The target electrical angle represents a margin period between when the low-side MOS transistor was turned off a half cycle ago and the moment when the lower arm on-period has ended. The upper MOS off-timing determining section and the lower MOS off-timing determining section set off timings of the MOS transistors such that the margin period is equivalent to the set value of the target electrical angle.
    Type: Application
    Filed: October 12, 2011
    Publication date: April 19, 2012
    Applicant: DENSO CORPORATION
    Inventor: Harumi HORIHATA
  • Patent number: 8138729
    Abstract: The present invention provides, as one aspect, a generation control apparatus for vehicles which controls current supply to a field winding of a generator to control output voltage of the generator. The apparatus includes a switching element connected to the field winding, and a duty determining unit that increases a drive duty for interrupting the switching element when output voltage of the generator becomes lower than a predetermined regulated voltage. The apparatus also includes a load response control unit that performs load response control for limiting an increase rate of the drive duty determined by the duty determining unit, after expiration of a predetermined time from application of an electrical load.
    Type: Grant
    Filed: March 6, 2009
    Date of Patent: March 20, 2012
    Assignee: Denso Corporation
    Inventor: Toshiya Konishi
  • Patent number: 8140205
    Abstract: A hybrid-vehicle driving system includes an engine, a transmission, a first motor/generator provided between the engine and the transmission, and a battery that can charge and discharge the first motor/generator. When an estimated output voltage of the first motor/generator becomes higher than or equal to a predetermined voltage during a gear shift operation of the transmission, the battery is electrically disconnected from the driving system, and the voltage of a power line on the side of the first motor/generator is then decreased so as to charge the battery.
    Type: Grant
    Filed: January 10, 2007
    Date of Patent: March 20, 2012
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Tomoyuki Hanyu, Kazuhiro Takeda, Yuki Kosaka, Hiraku Ooba, Hiroshi Iwano, Susumu Komiyama
  • Patent number: RE44084
    Abstract: A generator structure is provided for generating an AC power for a load. The generator structure includes a generator connectable to a load and an engine operatively connected to the generator for driving the same. A generator controller is operatively connected to the engine for controlling operation thereof and operatively connected to a generator for controlling the AC power generated thereby. A communications link connects the generator control to a network.
    Type: Grant
    Filed: March 13, 2012
    Date of Patent: March 19, 2013
    Assignee: Generac Power Systems, Inc.
    Inventors: Robert D. Kern, Steven J. Wilcox, Gerald C Ruehlow, Frank X. Wedel, Graham McLean, Phillip Harrison, Hongping Zhou