With Armature Or Primary Circuit Control Patents (Class 322/89)
  • Patent number: 10110007
    Abstract: Systems and methods to balance currents among a plurality of photovoltaic units connected in series. In aspect, a management unit is coupled between a photovoltaic energy production unit and a string of energy production units. The management unit has an energy storage element (e.g., a capacitor) connected to the photovoltaic energy production unit. The management unit further has a switch to selectively couple to the energy storage element and the photovoltaic energy production unit to the string. The management unit allows the current in the string to be larger than the current in the photovoltaic energy production unit.
    Type: Grant
    Filed: October 13, 2014
    Date of Patent: October 23, 2018
    Assignee: TIGO ENERGY, INC.
    Inventors: Ron Hadar, Shmuel Arditi
  • Patent number: 9985470
    Abstract: The present invention provides an uninterruptable power supply system and method with a first AC source providing three-phase AC power, a DC source providing DC power, and a power converter receiving AC power from the first AC source and/or DC power from the DC source and delivering two wire DC power to a load via a DC output line. One pole of the DC output line is connected to the neutral reference of the four-wire AC-power supply line. The system may include a bypass device for passing power from its output side to the DC output line with the bypass device and the power converter being connected in parallel to the DC output line. The bypass device may include at least one switching unit, which receives AC power at its input side, and a control unit to supply pulsed power from an AC power supply.
    Type: Grant
    Filed: May 17, 2016
    Date of Patent: May 29, 2018
    Assignee: ABB Schweiz AG
    Inventor: Esa-Kai Paatero
  • Patent number: 9667100
    Abstract: A centralized voltage control device connected to a first local voltage control device adjusting the control amount every second cycle such that a voltage of a transformer-type voltage control apparatus is maintained within a range between voltage upper and lower limit values updated every first cycle and a second local voltage control device adjusting the control amount of a reactive-power-modified voltage control apparatus every third cycle, wherein the centralized voltage control device includes a load and power-generation-amount estimation unit estimating a load and power-generation-amount distribution every first cycle under condition of a mean load and mean power generation, condition of a minimum load and maximum power generation, and condition of a maximum load and minimum power generation, a voltage-fluctuation-band estimation unit estimating a voltage fluctuation band, an optimal-voltage-distribution determination unit determining a control target value of the first local voltage control device, and
    Type: Grant
    Filed: June 26, 2013
    Date of Patent: May 30, 2017
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventor: Nobuhiko Itaya
  • Patent number: 9478989
    Abstract: A power converter circuit includes output terminals configured to receive an external voltage. A series circuit includes a number of converter units, each including input terminals configured to be coupled to a DC power source and output terminals configured to provide an output current. The series circuit is connected between the output terminals of the power converter circuit. A synchronization circuit is configured to generate a synchronization signal. The power converter circuit can be operated in a normal operation mode. In the normal operation mode, the synchronization circuit is configured to generate the synchronization signal dependent on the external voltage. In the normal operation mode, at least one converter unit of the plurality of converter units is configured to receive the synchronization signal and to regulate a generation of the output current such that a frequency and/or a phase of the output current is dependent on the synchronization signal.
    Type: Grant
    Filed: April 5, 2012
    Date of Patent: October 25, 2016
    Assignee: Infineon Technologies Austria AG
    Inventors: Gerald Deboy, Yi Tang
  • Patent number: 9166491
    Abstract: A converter system includes a first converter, a second converter, and a first inter-phase transformer. The first converter is electrically connected to the second converter in parallel between a first input terminal parallel end and a first output terminal parallel end. The first inter-phase transformer is disposed at the first input side parallel terminal or the first output side parallel terminal, and the first inter-phase transformer is operable to restrain a circulating current generated by the first converter and the second converter.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: October 20, 2015
    Assignee: DELTA ELECTRONICS, INC.
    Inventors: Chang-Yong Wang, Yan-Song Lu, Li Cai, Jun Chen, Teng Xu
  • Publication number: 20150130298
    Abstract: The vibration power generator includes: a plurality of permanent magnets (1, 2) integrated together to have given inter-magnet gaps under a state in which the same poles of the permanent magnets are opposed to each other; and a plurality of coils (3, 4) arranged on respective outer peripheries of the plurality of permanent magnets so as to have a distance from the plurality of permanent magnets, and is configured to generate an electric power through relative movement of the plurality of permanent magnets and the plurality of coils. A relationship between a length of the opposed coils and a length of the permanent magnet is set so that the length of the coils is larger than the length of the permanent magnet and equal to or smaller than a sum of the length of the permanent magnet and a length of the inter-magnet gap.
    Type: Application
    Filed: May 2, 2012
    Publication date: May 14, 2015
    Applicant: MITSUBISHI ELECTRIC ENGINEERING COMPANY, LIMITED
    Inventors: Hiromori Nomura, Ken Onishi, Masataka Bando
  • Patent number: 8981735
    Abstract: A power supply system for a motor vehicle includes a generator that includes a rotor having a field coil and a stator having an armature coil; a rectifier that rectifies AC power generated in the armature coil; an excitation control circuit that takes control of a voltage applied to the field coil; a capacitor that is connected to the DC side of the rectifier, and receives and transfers the rectified power; a battery connected to an electric load of the motor vehicle; a DC-DC converter that is connected between the capacitor and the battery and capable of converting unidirectionally or bidirectionally an input DC voltage into any DC voltage; and a selection switch which connects the capacitor or the battery to the excitation control circuit as a power supply source.
    Type: Grant
    Filed: November 30, 2010
    Date of Patent: March 17, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Nozomu Kamioka, Shinji Nishimura, Noriyuki Wada
  • Patent number: 8975876
    Abstract: A generator system includes a generator having a stationary portion and a rotating portion. An exciter field winding and a main armature winding are disposed on the stationary portion. An exciter armature winding and a main field winding are disposed on the rotating portion. A frequency demodulator is configured to extract a frequency modulated control signal from the exciter armature winding and to demodulate the frequency modulated control signal to generate a demodulated control signal. The generator includes a main field rotating power converter to selectively control current in the main field winding in response to the demodulated command signal. The generator system includes a generator control unit in electrical communication with the generator to monitor the output voltage at the main armature winding and to output an exciter current including the frequency modulated control signal to the exciter field winding based on the output voltage.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: March 10, 2015
    Assignee: Hamilton Sunstrand Corporation
    Inventors: Gregory I. Rozman, Steven J. Moss
  • Publication number: 20140340056
    Abstract: A control method for a switched reluctance generator employing dual switched-mode power converters does not require a position sensor. In the excitation stage, the upper tube and lower tube of the main switch of a phase in the power converter are switched on, and the phase current is detected. When the phase current rises to a preset threshold, the upper tube or lower tube of the main switch of the phase is switched off, changing the phase of the switched reluctance generator into a zero voltage natural freewheeling state. When the phase current drops to the valley value, the rotor position is the end position of maximum phase inductance of the phase. This rotor position is used as the switch-off position of the main switch of the phase of the switched reluctance generator, and the upper tube and lower tube for the main switch of the phase are switched off.
    Type: Application
    Filed: January 24, 2013
    Publication date: November 20, 2014
    Applicant: China University of Mining and Technology
    Inventor: Hao Chen
  • Patent number: 8878373
    Abstract: A variable electrical generator (20) is operable to convert mechanical motion to electrical power. The generator (20) includes at least a stator element (60) and a rotor element (50) including coils (320) and magnets (90). The generator (20) includes a configuration of modules (80) including the coils (320) for generating wavelets (30) in response to the coils (320) interacting magnetically with the magnets (90), and a control arrangement (70) for combining the wavelets (30) for generating a composite synthesized power output (10) from the generator (20). A method of maintaining a variable generator (20) includes steps of: (a) determining operating status of modules (80) of the generator (20); (b) unplugging and replacing one or more defective modules (80) as identified in step (a).
    Type: Grant
    Filed: March 23, 2011
    Date of Patent: November 4, 2014
    Assignee: Adaptive Generators AS
    Inventor: Kent Thoresen
  • Publication number: 20140266079
    Abstract: A generator system includes a generator having a stationary portion and a rotating portion. An exciter field winding and a main armature winding are disposed on the stationary portion. An exciter armature winding and a main field winding are disposed on the rotating portion. A frequency demodulator is configured to extract a frequency modulated control signal from the exciter armature winding and to demodulate the frequency modulated control signal to generate a demodulated control signal. The generator includes a main field rotating power converter to selectively control current in the main field winding in response to the demodulated command signal. The generator system includes a generator control unit in electrical communication with the generator to monitor the output voltage at the main armature winding and to output an exciter current including the frequency modulated control signal to the exciter field winding based on the output voltage.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 18, 2014
    Inventor: Hamilton Sundstrand Corporation
  • Patent number: 8766603
    Abstract: In a control apparatus for an inverter generator having a first, second and third windings wound around an alternator driven by an engine, and first, second and third inverters adapted to convert alternating current outputted from the first, second and third windings into direct current and invert the converted direct current into single-phase alternating current in a desired frequency so as to supply to the electric load, there is provided with an actuator (stepper motor) to open and close a throttle valve of the engine, and it is configured to detect output powers (effective powers) of the first, second and third inverters, to determine a target engine speed based on the detected output powers, and to control an operation of the actuator so that the engine speed converges at the determined target engine speed.
    Type: Grant
    Filed: May 16, 2012
    Date of Patent: July 1, 2014
    Assignee: Honda Motor Co., Ltd.
    Inventor: Shoji Hashimoto
  • Patent number: 8736235
    Abstract: A power-generation motor control system is a control system that controls a power-generation motor provided with an armature and a magnetic-field winding, and is characterized in that when the power-generation motor is operated as a motor, before a power source energizes the armature, a preliminary excitation current, with the value of which the induction voltage across the armature does not exceed the voltage of the power source, is applied to the magnetic-field winding in accordance with the rotation speed of the power-generation motor so that preliminary excitation of the power-generation motor is performed.
    Type: Grant
    Filed: October 17, 2011
    Date of Patent: May 27, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Mitsunori Tabata, Masato Mori, Kenji Nakajima, Kenichi Akita
  • Patent number: 8686695
    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 27, 2009
    Date of Patent: April 1, 2014
    Assignee: Vestas Wind Systems A/S
    Inventors: Anshuman Tripathi, Lars Helle, Allan Holm Jörgensen, Cao Shu Yu, Saurabh Gupta
  • Patent number: 8653798
    Abstract: A generator includes a rotor structure has a rotor frame that supports a rotor circuit. The rotor frame is electrically connected to the rotor circuit via a resistive element.
    Type: Grant
    Filed: March 18, 2011
    Date of Patent: February 18, 2014
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Nathan A. Berry, Philip Gillingwater
  • Patent number: 8648575
    Abstract: An electrical machine system including a permanent magnet assembly having a magnetic field and a plurality of conductive coils, the magnet assembly and coils arranged for relative rotation between the coils and magnetic field in the manner of an electrical generator or motor, the system further comprising a current injector electrically connected to said coils and arranged selectively to supply a current signal thereto, the current signal being asynchronous with the frequency of rotation between the permanent magnet assembly and coils so as to heat and thereby demagnetise one or more magnet within said permanent magnet assembly.
    Type: Grant
    Filed: March 28, 2011
    Date of Patent: February 11, 2014
    Assignee: Rolls-Royce PLC
    Inventors: John J A Cullen, Geraint W Jewell
  • Patent number: 8643344
    Abstract: In a self-excited generator 1 including an automatic voltage regulator (AVR) 10, a condensive load protection device includes: a field current control driver 21 which is connected to the field winding 6 in series and controlled to be ON/OFF by a drive circuit 23 of the AVR 10 to supply a field current to the field winding 6; and a condensive load protecting rotor short-circuit driver 22 which is connected in parallel to the field winding 6, and supplies a short-circuit current to the field winding 6 by being turned ON, and a bootstrap circuit 30 is connected as a drive power supply of the field current control driver and the condensive load protecting rotor short-circuit driver, and the bootstrap circuit 30 includes a capacitance portion 32 in which charges are accumulated when the field current control driver 21 is ON.
    Type: Grant
    Filed: October 29, 2010
    Date of Patent: February 4, 2014
    Assignee: Honda Motor Co., Ltd.
    Inventors: Minoru Maedako, Yasuhiro Nakada
  • Publication number: 20130335041
    Abstract: A power conversion apparatus including a current source converter configured to convert Alternate Current (AC) power to Direct Current (DC) power; a power controller configured to set a d-axis current command and a q-axis current command, which correspond to the AC power to the current source converter, by reflecting a difference between a measurement DC link voltage measured at an output terminal of the current source converter and a DC link voltage set by a DC link voltage command; and a phase angle controller configured to adjust a phase angle of the current source converter and transmit the adjusted phase angle to the current source converter, in response to the d-axis current command and the q-axis current command.
    Type: Application
    Filed: January 3, 2013
    Publication date: December 19, 2013
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Jei-hoon BAEK, Jong-soo KIM, Hyun-bae KIM, Kyu-bum HAN
  • Patent number: 8541909
    Abstract: A system and method for supplying power to a variable speed motor for rotating a shaft may include generating an A/C output having a variable frequency corresponding to speed of a prime mover, where the speed of the prime mover is equal to or greater than a predetermined speed limit. The A/C output of the prime mover may be distributed to the variable speed motor such that the speed of the variable speed motor is varied relative to the frequency of the A/C output. The variable speed motor may be electrically disconnected from the A/C power when the speed of the prime mover being used to drive the variable speed motor is equal to or within a predetermined range of the predetermined speed limit. An alternate A/C output may be distributed to the variable speed motor after the A/C power is electrically disconnected from the variable speed motor.
    Type: Grant
    Filed: June 27, 2011
    Date of Patent: September 24, 2013
    Assignee: DRS Power Technology, Inc.
    Inventors: Richard Armstrong, Edgar Thaxton
  • Patent number: 8492920
    Abstract: An electrical architecture for an aircraft providing power for the aircraft by generating power from a high pressure spool and a low pressure spool of a turbine engine. The spools can be used to drive corresponding generators; the power from which can be used to supply the various loads of the aircraft.
    Type: Grant
    Filed: February 19, 2013
    Date of Patent: July 23, 2013
    Assignee: GE Aviation Systems LLC
    Inventors: Hao Huang, Xiaochuan Jia, David Dimitri Karipides
  • Publication number: 20130147442
    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: Application
    Filed: August 28, 2009
    Publication date: June 13, 2013
    Applicant: VESTAS WIND SYSTEMS A/S
    Inventors: Anshuman Tripathi, Cao Shu Yu, Allan Holm Jörgensen, Lars Helle, Saurabh Gupta
  • Patent number: 8456138
    Abstract: A programmable system includes a first level protection circuit comprised of discharge tube CR1/ CR2 and piezoresistor MOV1/MOV2 in series; a second-level protection circuit comprised of the series arm of capacitor C1 and resistor R1 in parallel with a transient voltage suppression diode TVS1, and inductors L1/L2 connected to the ends of first level and second-level protection circuits respectively. A control circuit includes a PWM driver module and a SCM. The PWM driver module is connected to the PWM control port of the SCM and its output is connected to an IGBT module. The control circuit is also connected to a series communication module and to a user interface. The features of the invention are: strong-shock resistance; a wide range of load adaptability; and ability of accurately and steplessly regulating and adjusting with high frequency and high power load.
    Type: Grant
    Filed: July 14, 2010
    Date of Patent: June 4, 2013
    Assignees: MacMic Science & Technology Co., Ltd., Luxtech 360 LLC.
    Inventors: Xishe Lei, Xiao Bao Wang
  • Publication number: 20130106368
    Abstract: A turbo charger generator (1) generates power with a generator (7) by driving a gas turbine (3) and a compressor (6) with exhaust gas from an internal combustion engine (2). The generated AC power is supplied to an electric power system (12) via a power conversion unit (8). The power conversion unit (8) has a converter (13) for converting AC power into DC power, a unit (18) for estimating a rotor rotation angle ? based on a rotor magnetic flux, and a control unit (15) for coordinate-converting AC current into DC current by using the rotor rotation angle ? as the reference, and controlling the output DC power of the converter (13) such that the magnitude of the DC current is maintained at a target DC current value.
    Type: Application
    Filed: December 22, 2011
    Publication date: May 2, 2013
    Inventors: Yukio Yamashita, Keiichi Shiraishi, Yoshihisa Ono
  • Patent number: 8432137
    Abstract: A method for generating and controlling power by means of at least one controlled permanent magnet machine (PMM) with a permanent magnet (PM) rotor and a stator with a magnetic flux diverter circuit for controlling the output of the PMM, comprises the steps of: rotating the PM rotor at a velocity sufficient to develop a high frequency alternating current (HFAC) power output from the stator; transforming the HFAC output to produce a desired non-HFAC power output; sensing desired power output parameters; generating a control signal responsive to the sensed parameters; and applying the control signal to the magnetic flux diverter circuit to control the desired power output.
    Type: Grant
    Filed: May 19, 2009
    Date of Patent: April 30, 2013
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Gregory I. Rozman, Vietson M. Nguyen, Jacek F. Gieras, Sastry V. Vedula
  • Publication number: 20130027002
    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: Application
    Filed: July 25, 2011
    Publication date: January 31, 2013
    Inventors: Kaushik Rajashekara, John Timothy Alt
  • Patent number: 8319481
    Abstract: An apparatus and method generate electric current within a specified frequency range from a rotor operating within a broad range of rotational speeds by reducing the number of poles of the generator at higher rotational speeds. At higher rotational speeds, the generator circuit is altered so that a flow of current through half of a plurality of windings is reversed and the polarity in the said half of the windings is reversed. Two adjacent windings with the same polarity create a single pseudo pole, which effectively reduces the number of poles in the generator by half, and reduces the frequency of the electric current produced by the generator. Thus, the generator is operable to produce current within a specified frequency range from a rotor operating within a broad range of rotational speeds.
    Type: Grant
    Filed: December 26, 2006
    Date of Patent: November 27, 2012
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Glenn C. Lemmers, Darin R. Morman
  • Publication number: 20120286744
    Abstract: A synchronous rectification alternator for a motor vehicle is disclosed. The alternator includes a stator, a rotor, and a synchronous rectification system for rectifying into a DC voltage the alternating voltages supplied by the stator, and a voltage regulator for regulating the DC voltage. The alternator also includes fault detection for detecting faults in the synchronous rectification and supplying fault detection information to the voltage regulator. In one version, the fault information is supplied to the voltage regulator at fault inputs also receiving phase signals representing the alternating voltages supplied by the stator. At least one of the items of fault information is used to cause, in the voltage regulator, opening of an excitation circuit supplying current to an excitation coil of the rotor so as to produce, in the voltage regulator, a fault indication.
    Type: Application
    Filed: July 22, 2010
    Publication date: November 15, 2012
    Inventors: Marc Tunzini, Olivier Grammont, Guillaume Duthhilleul, Victor Dos Santos
  • Publication number: 20120280665
    Abstract: A control method for low voltage ride through comprises the following steps: 1) A control circuit (9) monitors a DC bus voltage of a set of frequency converters (3, 4) connected between a wind generator rotor and a power grid (12) and a voltage of the power grid; 2) If the monitored DC bus voltage of the set of frequency converters is judged to be higher than a designed value, the control circuit controls a thyristor (7) in a crowbar protection circuit connected to the wind generator rotor to be closed to obtain a shunt protection; 3) After the thyristor is closed, the control circuit controls a stator breaker (1) which is connected between a wind generator stator and the power grid to disconnect the wind generator stator and the power grid; 4) After the stator breaker disconnects the power grid and the wind generator stator, the control circuit further controls a breaker (5) of a shunt circuit to be opened firstly and then be closed, the thyristor is turned off automatically, and thus the protection function
    Type: Application
    Filed: October 25, 2010
    Publication date: November 8, 2012
    Applicant: Sinovel Wind Group Co.,Ltd.
    Inventors: Liying Su, Haibin Jing, Song Yang, Ying Yuan
  • Patent number: 8299638
    Abstract: Propulsion system for ships and other mobile marine structures, with a driving machine for running an electrical generator, which is further connected to an electrical propulsion motor with connection to a propeller or similar propulsion device. The system can be simplified in that the generator and the propulsion motor are permanently magnetized synchronous machines. The two synchronous machines have substantially the same basic construction, with approximately identical voltage characteristics with regard to frequency, and they are directly connected together with a rigid electrical connection.
    Type: Grant
    Filed: August 27, 2004
    Date of Patent: October 30, 2012
    Assignee: Inpower AS
    Inventors: Normann Sandöy, Reidar Vaardal
  • Publication number: 20120242296
    Abstract: A vehicle electrical system comprises a generator and a control device coupled with the generator and operable to protect the generator from catastrophic failure while providing the electrical load in the electrical system with sufficient electrical power. The control device determines a loss of symmetry between two alternating phase signals generated by a first and second phase windings of a single or multiple stator generator. In particular, the control device determines a first and second average values of two of the two or more alternating phase signals and either limits or ceases the total electrical output current of the generator, via a generator output power controller, when the first average value differs from the second average value by a predetermined value. The control device may alternatively be configured to generate an error signal without varying the generator's total electrical output current even in the event of a malfunction.
    Type: Application
    Filed: June 8, 2012
    Publication date: September 27, 2012
    Inventor: Ciaran Patterson
  • Patent number: 8258760
    Abstract: An exciter assembly for supplying a field current to the rotor windings of a superconducting synchronous machine includes a pulse transformer having a stationary primary winding, a secondary winding and a tertiary winding. A switched mode power supply supplies a pulsed voltage to the primary winding of the pulse transformer. The pulsed voltage developed at the secondary winding of the pulse transformer is supplied to the rotor windings through a pair of transfer leads. A controller controls synchronous rectification of the pulsed voltage supplied to the rotor windings based on a signal from the tertiary winding of the pulse transformer.
    Type: Grant
    Filed: May 12, 2011
    Date of Patent: September 4, 2012
    Assignee: Converteam UK LTD
    Inventor: Allan David Crane
  • Publication number: 20120056602
    Abstract: Aspects of the disclosure relate to a control approach that utilizes a direct-current-based d-q vector control technology for variable-speed PMSG wind turbines based on full voltage source PWM converters. The control approach can be based on a nonlinear programming configuration for attaining a desired performance of PMSG wind turbine under operation constraints. The control approach can comprise a PMSG control unit that exploits fuzzy, adaptive, and PID control technologies in an optimal or nearly optimal control configuration. The control approach provides a smart wind turbine control technology that can be based on virtual lookup tables for effective PMSG power extraction.
    Type: Application
    Filed: August 25, 2011
    Publication date: March 8, 2012
    Inventors: Shuhui Li, Tim A. Haskew
  • Patent number: 8125178
    Abstract: A drive and a method, including an electric motor, which is supplied by a rectifier, the rectifier including a time-discrete closed-loop control structure, which regulates the stator current of the electric motor by setting the voltage applied at the motor, the current of the motor being acquired in time-discrete fashion, the closed-loop control structure including a closed-loop controller whose actual value is a first current component of the current, the setpoint input of the closed-loop controller being coupled with at least one upstream setpoint limiter.
    Type: Grant
    Filed: July 17, 2007
    Date of Patent: February 28, 2012
    Assignee: Sew-Eurodrive GmbH & Co. KG
    Inventors: Wolfgang Hammel, Thomas Schuster
  • Patent number: 8072190
    Abstract: A method of and a system for controlling a permanent magnet AC generator (10), wherein the generator is provided with stator windings and permanent magnets in the rotor and wherein the generator is connected to a drive unit (50), wherein the generator is further provided with a semiconductor converter provided with AC output connected to the generator output and a DC link for controlling the output voltage of the generator, and the converter is further provided with filter means for filtering the output of the converter so that a filtered output of the converter is fed to the generator output.
    Type: Grant
    Filed: May 18, 2007
    Date of Patent: December 6, 2011
    Assignee: The Switch High Power Converters Oy
    Inventors: Pasi Törmänen, Dejan Schreiber
  • Publication number: 20110234180
    Abstract: An electrical machine system including a permanent magnet assembly having a magnetic field and a plurality of conductive coils, the magnet assembly and coils arranged for relative rotation between the coils and magnetic field in the manner of an electrical generator or motor, the system further comprising a current injector electrically connected to said coils and arranged selectively to supply a current signal thereto, the current signal being asynchronous with the frequency of rotation between the permanent magnet assembly and coils so as to heat and thereby demagnetise one or more magnet within said permanent magnet assembly.
    Type: Application
    Filed: March 28, 2011
    Publication date: September 29, 2011
    Applicant: ROLLS-ROYCE PLC
    Inventors: John J. A. CULLEN, Geraint W. JEWELL
  • Publication number: 20110227425
    Abstract: Disclosed are an apparatus, a system, and a method for suspension of a vehicle. An electromagnetic generator generates an electrical energy in response to a relative movement between a vehicle body and a wheel assembly. A storage device stores the electrical energy generated from the electromagnetic generator.
    Type: Application
    Filed: March 16, 2010
    Publication date: September 22, 2011
    Applicant: EMPIRE TECHNOLOGY DEVELOPMENT LLC
    Inventor: Chun Shig SOHN
  • Publication number: 20110193534
    Abstract: An electric alternator/motor having a stator with at least two non-overlapping sectors is provided. Each sector includes a first winding, first and second magnetic circuits and a saturation control assembly. A cross-talk reduction feature, such as a peripheral slit is provided between each sector of the stator for impeding magnetic flux crossing between the sectors.
    Type: Application
    Filed: April 21, 2011
    Publication date: August 11, 2011
    Applicant: PRATT & WHITNEY CANADA CORP.
    Inventors: Kevin Allan DOOLEY, Joshua D. Bell
  • Patent number: 7977910
    Abstract: A starting method and system for a motor where the motor may be started as an induction motor by applying a magnetizing current to build flux through the stator, with the field current set at the maximum permissible exciter stator current (i.e., the current that will cause rated no-load current in the main field at the transition speed). The motor stator currents will be maintained at a value that allows the motor to generate sufficient breakaway torque to overcome any stiction. At a specific transition speed or after a period of time, the drive will initiate a transition from induction motor control to synchronous motor control by removing the initial magnetizing current, and a field current is then applied to the motor through the DC exciter. Once this transition is completed, the drive may ramp up to the desired speed demand.
    Type: Grant
    Filed: April 18, 2008
    Date of Patent: July 12, 2011
    Assignee: Siemens Industry, Inc.
    Inventors: Richard H. Osman, Kinjal Patel, Mukul Rastogi
  • Patent number: 7969123
    Abstract: An exciter assembly for supplying a field current to the rotor windings of a superconducting synchronous machine includes a pulse transformer having a stationary primary winding and a secondary winding that is mounted to the rotor of the superconducting synchronous machine for rotation therewith. A switched mode power supply supplies a pulsed voltage to the primary winding of the pulse transformer. The pulsed voltage developed at the secondary winding of the pulse transformer is supplied to the rotor windings through a rectifier semiconductor device and a pair of transfer leads. The rotor windings and a flywheel semiconductor device are located inside a cryogenic chamber or cryostat. The flywheel semiconductor device is connected in parallel with the rotor windings and operates in unison with the rectifier semiconductor device in order to provide synchronous rectification of the switched mode power supply output.
    Type: Grant
    Filed: February 13, 2006
    Date of Patent: June 28, 2011
    Assignee: Converteam UK Ltd
    Inventor: Allan David Crane
  • Patent number: 7969044
    Abstract: A power distribution system is provided for supplying power to a variable speed motor for rotating a shaft. The system comprises a variable speed prime mover adapted to generate an A/C output having a variable frequency corresponding to the speed of the prime mover, a power switch, a power distribution bus connected to the A/C output of the prime mover and connected, via the switch, to the motor such that the motor's speed is varied relative to the frequency of the A/C output, and a variable frequency drive operatively connected to the A/C output of the prime mover via the bus and effective to provide an alternate A/C output to the motor after the motor is disconnected from the bus. The switch is adapted to disconnect the motor from the bus when the prime mover's speed is equal to or within a predetermined range of the prime mover's speed limit.
    Type: Grant
    Filed: January 15, 2009
    Date of Patent: June 28, 2011
    Assignee: DRS Power Technology, Inc.
    Inventors: Richard Armstrong, Edward Thaxton
  • Patent number: 7969122
    Abstract: Disclosed is a pole count changing generator capable of altering the number of poles contained within a generator. This pole count change is accomplished by changing the path through which electrical current is capable of traveling in response to a control signal sent to a pole count changing circuit.
    Type: Grant
    Filed: November 14, 2007
    Date of Patent: June 28, 2011
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Glenn C. Lemmers, Darin R. Morman, Eric J. Cunningham
  • Patent number: 7960948
    Abstract: An exemplary power system may include an electric machine with multiple sets of stator windings, each set of windings being coupled through a separate switch matrix to a common voltage bus, and each of which may be spatially arranged in full pitch around the stator such that stator flux harmonics are substantially reduced. The reduced stator flux harmonics may be associated with phase current harmonic content. In an example application, such power systems may operate in a generating mode to transfer mechanical energy to electrical energy on a DC voltage bus. In some illustrative embodiments, the power system may provide both high-power and high-speed (e.g., 1 MW at 8000 rpm or above) motoring and/or generating capability suitable, for example, for on-board (e.g., marine, aviation, traction) power systems.
    Type: Grant
    Filed: March 29, 2010
    Date of Patent: June 14, 2011
    Assignee: Direct Drive Systems, Inc.
    Inventors: Daniel M. Saban, Raed H. Ahmad, Zhiguo Pan
  • Patent number: 7902798
    Abstract: An electric power generation control apparatus for a vehicle alternator mounted on a motor vehicle performs one of a constant output voltage control a constant torque control and a constant exciting current control in order to suppress a hunting phenomenon of the vehicle alternator. First of all, the electric power generation control apparatus performs the constant output voltage control when a rotation speed is within an idling rotation speed range or a periodic change of the rotation speed is not less than a predetermined value. After completion of the constant output voltage control, when judging that the idle hunting phenomenon is not adequately suppressed, the electric power generation control apparatus performs one of the constant torque control and the constant exciting current control.
    Type: Grant
    Filed: March 3, 2008
    Date of Patent: March 8, 2011
    Assignees: Nippon Soken, Inc., Denso Corporation
    Inventors: Norihito Kimura, Naoki Yamamoto
  • Patent number: 7863868
    Abstract: A generator system is configured to supply two phase excitation current from an exciter rotor to a main generator rotor. When driven by a variable speed prime mover, the generator system provides relatively constant frequency AC power by independently controlling the main rotor flux rotational speed. The generator system includes an exciter stator that induces current in the exciter rotor windings at a desired frequency and phasing. The exciter rotor windings are electrically connected to the main rotor windings to provide two-phase excitation current to the main rotor windings. Excitation is supplied to the exciter stator from an exciter controller, which controls the frequency and phasing of the exciter excitation, based on the rotational speed of the generator, to maintain a constant output frequency.
    Type: Grant
    Filed: June 5, 2007
    Date of Patent: January 4, 2011
    Assignee: Honeywell International Inc.
    Inventors: Mingzhou Xu, Cristian E. Anghel, Wayne T. Pearson
  • Patent number: 7830105
    Abstract: Embedding electrical machines in gas turbine engines has particular advantages by avoiding the need to provide mechanical connections. However, electrical machines such as switched reluctance electrical machines require relatively large electrical capacitors to accommodate and filter voltage variations in the phases of the electrical machine. Generally, the electrical machine will have a motoring period or generating period with a spacer period between. By injecting electrical current as electrical power in the spacer period, there is limited effect upon net torque within the electrical machine or electrical power generation. However, such stored electrical power in an inductive winding element of the electrical machine augments power pulses provided by a power source incorporating an electrical capacitor. In such circumstances, a smaller sized electrical capacitor can be used.
    Type: Grant
    Filed: July 21, 2008
    Date of Patent: November 9, 2010
    Assignee: Rolls-Royce PLC
    Inventors: David Reginald Trainer, John James Anthony Cullen, Stephen Andrew Long
  • Patent number: 7764051
    Abstract: A power output apparatus includes first and second motor generators, first and second inverters and a relay circuit. The first and second motor generators include first and second 3-phase coils, respectively. The first inverter alters periodically the potential at a first neutral point of the 3-phase coil. The second inverter alters periodically the potential of the second neutral point of the second 3-phase coil at phase corresponding to a phase-inverted version of the potential change of the first neutral point. The relay circuit responds to a control signal from the control device to electrically connect first and second AC lines to a connector, and provides an alternating voltage generated across the first and second neutral points to the connector.
    Type: Grant
    Filed: November 28, 2005
    Date of Patent: July 27, 2010
    Assignees: Toyota Jidosha Kabushiki Kaisha, Aisin AW Co., Ltd.
    Inventors: Tetsuhiro Ishikawa, Hichirosai Oyobe, Yukihiro Minezawa
  • Patent number: 7746039
    Abstract: The invention relates to a method for the controlled application of a stator-current target value (ISnom) and a torque target value (Mnom) for a polyphase machine (4) that is supplied by an electronic power converter.
    Type: Grant
    Filed: July 15, 2004
    Date of Patent: June 29, 2010
    Assignee: Siemens Aktiengesellschaft
    Inventors: Frank Hoffmann, Franz Sperr, Georg Stanke
  • Patent number: 7710081
    Abstract: An exemplary power system may include an electric machine with multiple sets of stator windings, each set of windings being coupled through a separate switch matrix to a common voltage bus, and each of which may be spatially arranged in full pitch around the stator such that stator flux harmonics are substantially reduced. The reduced stator flux harmonics may be associated with phase current harmonic content. In an example application, such power systems may operate in a generating mode to transfer mechanical energy to electrical energy on a DC voltage bus. In some illustrative embodiments, the power system may provide both high-power and high-speed (e.g., 1 MW at 8000 rpm or above) motoring and/or generating capability suitable, for example, for on-board (e.g., marine, aviation, traction) power systems.
    Type: Grant
    Filed: May 21, 2007
    Date of Patent: May 4, 2010
    Assignee: Direct Drive Systems, Inc.
    Inventors: Daniel M. Saban, Raed H. Ahmad, Zhiguo Pan
  • Patent number: 7687928
    Abstract: An aircraft starting and generating system includes a first starter/main machine assembly that includes a first exciter and a first main machine, and second starter/main machine assembly that includes a second exciter and a second main machine. The system also includes a permanent magnet generator (PMG) that is connected to the first and second starter/main machine assemblies. The system further includes a first inverter/converter/controller (ICC) that is connected to the first starter/main machine assembly and to the PMG, and a second ICC that is connected to the second starter/main machine assembly and to the PMG.
    Type: Grant
    Filed: May 3, 2007
    Date of Patent: March 30, 2010
    Assignee: Smiths Aerospace, LLC
    Inventors: Dinesh N. Taneja, Hao Huang, Gary A. Padgett, Jan Zywot, Paul J. Wirsch, Jr., Mohamed A. Abbas
  • Publication number: 20100060245
    Abstract: Cathode-anode voltage across free-wheeling diodes in an active rectifier is used in the determination of switching points when the free-wheeling diode is forward biased. Hysteretic switching is accomplished through the selection of conductive and non-conductive switching threshold. The switching thresholds are further selected to prevent voltage oscillations at zero current crossings and reduce delays during deactivation to prevent cross-conduction.
    Type: Application
    Filed: September 3, 2009
    Publication date: March 11, 2010
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
    Inventors: Chandra S. Namuduri, Kenneth J. Shoemaker