With Controlled A.c. To D.c. Circuit In Inverter Supply Patents (Class 318/803)
  • Patent number: 10528023
    Abstract: Embodiments of the present disclosure relate to an electric motor drive system for driving a low-voltage motor. The low-voltage motor includes a rotor and a stator that comprises a number of single-turn coils. A motor drive controller can control the low-voltage motor. The motor drive controller includes a current source inverter. The current source inverter includes driver circuitry configured to generate switching commands, a variable current source and motor commutation circuitry. The variable current source can generate a variable current that regulates power in the low-voltage motor. The motor commutation circuitry receives the variable current and switching commands, and commutates phase currents that are output to the low-voltage motor.
    Type: Grant
    Filed: December 22, 2016
    Date of Patent: January 7, 2020
    Assignee: General Dynamics-OTS. Inc.
    Inventor: Russell Steinbach
  • Patent number: 10517286
    Abstract: An irrigation system broadly comprising a number of irrigation spans and a control system configured to operate single speed drive motors of the irrigation spans in a start-up mode, full speed mode, and wind-down mode. In the start-up mode, the motor controller gradually increases the drive motor speed from 0 rpms to a full speed by ramping a voltage applied to the drive motor from a starting voltage to a full speed voltage according to a start-up voltage profile over a start-up time interval. In the full speed mode, the motor controller operates the drive motor at a full speed voltage. In the wind-down mode, the motor controller gradually decreases the drive motor speed from full speed to 0 rpms by ramping the voltage applied to the drive motor from the full speed voltage to an ending voltage according to a wind-down voltage profile over a wind-down time interval.
    Type: Grant
    Filed: August 23, 2017
    Date of Patent: December 31, 2019
    Assignee: Lindsay Corporation
    Inventors: Mark William Miller, Bradford Ellison
  • Patent number: 10498273
    Abstract: Described is an independent speed variable frequency generator system that may include a rotor and a stator. The system may further include a pilot generator stage including a magnetic field source positioned on the rotor and a set of pilot multiphase windings positioned on the stator. The system may also include a high frequency transformer stage including a first set of high frequency transformer multiphase windings positioned on the stator and a second set of high frequency transformer multiphase windings positioned on the rotor. The system may also include a main machine stage including a set of main field multiphase windings positioned on the rotor and a set of main armature multiphase windings positioned on the stator, where the second set of high frequency transformer multiphase windings are coupled directly to the set of main field multiphase windings. The system may include a generator control unit.
    Type: Grant
    Filed: April 23, 2018
    Date of Patent: December 3, 2019
    Assignee: THE BOEING COMPANY
    Inventors: Lijun Gao, Eugene Solodovnik, Shengyi Liu
  • Patent number: 10483894
    Abstract: A control system for an electric motor (10) comprises a current sensing means (14) arranged to produce a current sensing output indicative of electric current in the motor, current control means (20) arranged to receive a current demand and to control voltages applied to the motor, and correction means (26) arranged to receive the current sensing output and the current demand, and use them to generate a correction signal. The current control means (20) is arranged to receive the correction signal and to use the correction signal to correct the voltages applied to the motor.
    Type: Grant
    Filed: May 16, 2012
    Date of Patent: November 19, 2019
    Assignee: TRW LIMITED
    Inventor: Christoper David Dixon
  • Patent number: 10483841
    Abstract: In a process of cancelling shutdown of a second converter during transmission of electric power between a first power line and a second power line with voltage conversion by a first converter in a shutdown state of the second converter, a motor vehicle performs single element switching control that switches one switching element between third and fourth switching elements of the second converter while setting the other switching element off, such as to prevent an electric current in a reverse direction to an electric current flowing in a first reactor of the first converter from flowing in a second reactor of the second converter.
    Type: Grant
    Filed: April 17, 2018
    Date of Patent: November 19, 2019
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Shintaro Tsujii
  • Patent number: 10381968
    Abstract: A three-phase regenerative drive employing multiple converter pulse width modulation (PWM) strategies. The drive includes a three-phase converter having inputs for connection to a three-phase AC source, the three-phase converter having three phase legs, a DC bus operably connected to the three-phase converter wherein the three phase converter is configured to direct current from the three-phase AC source to the DC bus, and a three-phase inverter operably connected to the DC bus and a motor, the three phase inverter configured to draw current from the DC bus and provide three phase command signals to the motor. The three-phase converter employs a first PWM strategy to supply current to the DC bus, and the converter employs a second PWM strategy to supply current to the DC bus if a total current in the three phase legs exceeds a selected threshold.
    Type: Grant
    Filed: December 5, 2017
    Date of Patent: August 13, 2019
    Assignee: OTIS ELEVATOR COMPANY
    Inventor: Ismail Agirman
  • Patent number: 10361634
    Abstract: A power conversion circuit is provided. A reference signal is integrated over a first timer period. A second signal is generated that is approximately proportional to an output current of the power conversion circuit. The second signal is integrated over a second time period. A first result of the integration of the reference signal is compared to a second result of the integration of the second signal. A fault signal is asserted if the second result is greater than the first result.
    Type: Grant
    Filed: June 18, 2018
    Date of Patent: July 23, 2019
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventor: Petr Papica
  • Patent number: 10330070
    Abstract: A starter for an internal combustion engine includes a multi-phase brushless electric motor, a controller and an inverter. A method for controlling the starter includes determining initial current commands for operating the electric motor in response to an activation command. Electrical current supplied to the electric motor and a rotational position of an output member of the electric motor are monitored. The electrical current is monitored directly without an intervening current prediction step. Interim voltage commands are determined based upon the initial current commands and the monitored currents, and final voltage commands are determined by subjecting the interim voltage commands to voltage limits. A rotational position compensation term is determined based upon the rotational position and rotational speed of the electric motor, and operation of the inverter is controlled to control the electric motor based upon the final voltage commands and the rotational position compensation term.
    Type: Grant
    Filed: November 14, 2017
    Date of Patent: June 25, 2019
    Assignee: GM Global Technology Operations LLC.
    Inventors: Lei Hao, Chandra S. Namuduri, Suresh Gopalakrishnan
  • Patent number: 10284131
    Abstract: A motor-driven compressor for a vehicle includes a housing, a compression unit, a motor, and an inverter device. The inverter device includes an inverter circuit, a capacitor, a current sensor, a determination means configured to control switching elements in response to the current sensor not detecting a flow of current when the motor stops operating and configured to determine whether or not the current sensor detects a flow of current when controlling the switching elements, and a discharge starting means configured to start discharging the capacitor when the determination means determines that the flow of current has not been detected.
    Type: Grant
    Filed: March 26, 2018
    Date of Patent: May 7, 2019
    Assignee: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Takashi Kawashima, Yoshiki Nagata, Satoshi Okada, Fumihiro Kagawa, Kazuki Najima, Hiroshi Fukasaku
  • Patent number: 10224853
    Abstract: To provide an AC rotary machine controller which can improve setting accuracy of torque command correction value in a region where change of torque command correction value to change of rotational speed and torque becomes large and where nonlinearity is high, and can suppress increase in data amount of correction value setting map. In correction value setting map, one or both of a torque axis unequal interval setting that sets interval of the torque command map axis to unequal interval in each rotational speed; and a rotation axis unequal interval setting that sets interval of the rotational speed map axis to unequal interval were done.
    Type: Grant
    Filed: January 10, 2018
    Date of Patent: March 5, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kotaro Nakano, Noriyuki Wada, Yasufumi Ogawa, Daiki Matsuura
  • Patent number: 10187000
    Abstract: A system or method for a VSD with an active converter including a controller, an inductor, an active converter, a DC link, and an inverter. The active converter is controlled to receive an input AC voltage and output a boosted DC voltage to a DC link, up to 850 VDC, the active converter using only low voltage semiconductor switches to provide the 850 VDC DC link voltage. The controller is configured to operate with a reactive input current magnitude equal to zero at a predetermined system load, and at system loads less than the predetermined system load, to introduce a reactive input current that results in a converter voltage having a magnitude less than the input voltage, wherein the vector sum of the input voltage and an inductor voltage is equal to the converter voltage.
    Type: Grant
    Filed: May 6, 2016
    Date of Patent: January 22, 2019
    Assignee: Johnson Controls Technology Company
    Inventors: Konstantin Borisov, Ivan Jadric
  • Patent number: 10141883
    Abstract: The invention relates to an input stage (1) for a motor controller (2), especially a motor controller for an electric motor, the input stage (1) being provided with an input (3) for inputting an input signal and an output (4) for connection to the motor controller (2). The input stage (1) is designed to generate a control signal from an input signal between a first voltage Uunten and a second voltage Uoben>Uunten and output said control signal as a parameter to the motor controller (2) via the output (4). In order to be able to simultaneously use the control input (13) for communicating, the input stage (1) comprises a first comparator (5) for comparing the input signal with a first threshold voltage Us1>Uoben as well as a data output unit (10). The data output unit (10) generates a communication signal on the basis of at least one portion of the input signal.
    Type: Grant
    Filed: November 20, 2015
    Date of Patent: November 27, 2018
    Assignee: ZIEHL-ABEGG SE
    Inventor: Joachim Knorr
  • Patent number: 10084368
    Abstract: A motor driving apparatus includes an AC-DC conversion unit configured to rectify an AC power supplied from an external AC power source, a DC link unit configured to stabilize a voltage rectified by the AC-DC conversion unit, and a DC-AC conversion unit configured to supply the AC power to a motor using the DC voltage from the DC link unit. The DC link unit may include one pair of film capacitors configured to remove a ripple of the rectified voltage, and the DC-AC conversion unit may include a 3-level inverter receiving the DC voltage from the one pair of film capacitors to supply the AC power to the motor.
    Type: Grant
    Filed: March 14, 2016
    Date of Patent: September 25, 2018
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Je Hyung Cho, Sun Jin Kim, Han Sol Seo
  • Patent number: 10038367
    Abstract: An electrical system including a three phase AC input supply and three or more H-bridge converter cells. Each H-bridge converter cell has: an active front end rectifier for receiving the three phase AC input supply and transforming it into a DC supply, thereby providing a rectifier current ii; a capacitor suitable to receive a capacitor current iC, the capacitor smoothing the DC supply; and an inverter suitable to receive an inverter current io, wherein io=ii?iC, said inverter transforming the received inverter current io into a single phase AC supply. The system also including a control subsystem, which provides a signal to each active front end rectifier to vary its respective rectifier current ii such that the difference between the rectifier current ii, provided by the active front end rectifier, and the inverter current io, received by the inverter, is substantially zero.
    Type: Grant
    Filed: May 22, 2017
    Date of Patent: July 31, 2018
    Assignee: ROLLS-ROYCE plc
    Inventors: Xiong Liu, Michael A. Zagrodnik, Amit K. Gupta
  • Patent number: 10008917
    Abstract: A regenerative drive device and a method for configuring the DC link of a regenerative drive device are disclosed. The multilevel regenerative drive device may include an inverter having a plurality of power components and a converter having a plurality of power components. The multilevel regenerative drive device may also include a direct current (DC) link bridging the inverter and the converter, the DC link including a capacitor, an inverter neutral point, and a converter neutral point independent of the inverter neutral point. Alternatively, the inverter neutral point and the converter neutral point may be connected.
    Type: Grant
    Filed: December 18, 2013
    Date of Patent: June 26, 2018
    Assignee: OTIS ELEVATOR COMPANY
    Inventors: Ismail Agirman, Steven M. Millett, Shashank Krishnamurthy, Yang Wang
  • Patent number: 9973126
    Abstract: Systems and methods for controlling the operating speed and the torque of an electric motor using an operational model are described. An operational model for the electric motor, including a plot of engine performance parameters, is used for reference, and a most efficient output path, which may pass through an optimal operation region in the operational model, is selected. The most efficient output path may be determined, for example, according to locations of a current output state and a to-be-reached target state in the operational model, enabling the operating state of the motor to reach the target state from the current operating state. By selecting a more efficient output path, the operating efficiency of the motor may be optimized, the life of a battery improved and/or the operating mileage of the vehicle may be increased, without significantly reducing the driving experience.
    Type: Grant
    Filed: July 20, 2017
    Date of Patent: May 15, 2018
    Assignee: THUNDER POWER NEW ENERGY VEHICLE DEVELOPMENT COMPANY LIMITED
    Inventor: Sheng-Fu Lai
  • Patent number: 9966882
    Abstract: A control system for an electric motor comprises a current sensing means arranged to produce a current sensing output indicative of electric current in the motor, current control means arranged to receive the current sensing output and to output a voltage demand indicative of voltages to be applied to the motor, and current sensing correction means arranged to monitor the voltage demand to measure distortion in the current sensing output and to generate a correction signal which is arranged to correct the distortion.
    Type: Grant
    Filed: February 16, 2011
    Date of Patent: May 8, 2018
    Assignee: TRW LIMITED
    Inventors: Connel Brett Williams, Christopher David Dixon, Robert James Huxford
  • Patent number: 9954475
    Abstract: A motor driving apparatus includes a rectifying circuit to rectify an AC power supplied from an external AC power source, one pair of film capacitors to output a DC voltage and a neutral point voltage by removing a ripple of a voltage rectified by the AC-DC conversion unit, a 3-level inverter to supply a driving current to a motor using the DC voltage applied from the DC link unit, and a control module to control the 3-level inverter. The control module includes a motor speed control module to control the rotation of the motor, a DC voltage control module to stabilize the DC voltage, a neutral point voltage control module to stabilize the neutral point voltage, and a stabilizing voltage limiting module to control the DC voltage control module and the neutral point voltage control module according to an output of the motor speed control module.
    Type: Grant
    Filed: March 14, 2016
    Date of Patent: April 24, 2018
    Assignees: SAMSUNG ELECTRONICS CO., LTD., SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION
    Inventors: Je Hyung Cho, Seung-Ki Sul, Se Hwa Choe, Han Sol Seo
  • Patent number: 9935573
    Abstract: Methods, systems and computer readable storage devices for a four quadrant voltage limiter that limits a commanded phase voltage to within a volt second capability of an inverter by maintaining a rotor flux and folding back a torque under both motoring and regeneration torque commands. In one embodiment: (a) in a motoring operation, an upper limit for a q-axis voltage is enforced; and (b) in a regeneration operation a lower limit for the q-axis voltage is enforced.
    Type: Grant
    Filed: February 26, 2015
    Date of Patent: April 3, 2018
    Assignee: BAE Systems Controls Inc.
    Inventors: Robert J. Vovos, Arthur P. Lyons
  • Patent number: 9906180
    Abstract: An electromechanical system includes an inverter drive, a component arranged during operation to generate a variable force having one or more periodic frequency components, and processing circuitry arranged to determine the power output of the inverter drive, measure a difference between the power output and a reference power output, and control an output frequency of the inverter drive as a function of the measured difference, so as to stabilise the power output during operation of the component. Other example electromechanical systems, inverter drives and methods are also disclosed.
    Type: Grant
    Filed: April 4, 2017
    Date of Patent: February 27, 2018
    Assignee: NIDEC CONTROL TECHNIQUES LIMITED
    Inventor: Colin Hargis
  • Patent number: 9882514
    Abstract: A converter comprises a first inverter for converting a first multi-phase AC voltage into a DC voltage and a second inverter for converting the DC voltage into a second multi-phase AC voltage. A method for controlling the electrical converter comprises: switching the first inverter such that a first common mode voltage is generated in the first multi-phase AC voltage; switching the second inverter such that a second common mode voltage is generated in the second multi-phase AC voltage, wherein the first common mode voltage and the second common mode voltage are synchronized such that the first common mode voltage and the second common mode voltage cancel each other at least partially.
    Type: Grant
    Filed: December 5, 2016
    Date of Patent: January 30, 2018
    Assignee: ABB Schweiz AG
    Inventor: Peter Steimer
  • Patent number: 9859837
    Abstract: A negative voltage protection system includes a negative voltage comparison circuit, a signal processing circuit, a driving circuit, a driving output circuit, a power device, and a coil module. When the coil module generates a back electromotive force, the coil module outputs a negative voltage. When an intensity of the negative voltage detected by the negative voltage comparison circuit is greater than a predetermined value, the signal processing circuit generates a control signal to the driving circuit. The driving circuit controls the driving output circuit and the power device to reduce the intensity of the negative voltage according to the control signal.
    Type: Grant
    Filed: December 1, 2016
    Date of Patent: January 2, 2018
    Assignee: Prolific Technology Inc.
    Inventors: Chih-Shih Yang, Jia-Jun Liu, Wan-Yang Chen
  • Patent number: 9825578
    Abstract: Object of the present disclosure is to improve accuracy of over-temperature protection of an electric motor. A control device controls an inverter main circuit for driving the electric motor. An electric power conversion circuit controller acquires DC voltage input to the inverter main circuit, output voltage of the inverter main circuit, motor amperage of current flowing through the electric motor, and motor frequencies indicating rotation rate of the electric motor. Based on at least one of the DC voltage, output voltage, motor amperage and motor frequencies, a motor loss estimator calculates a stator loss and rotor loss, each including fundamental and harmonic losses of the electric motor. Based on the inverter output voltage, stator loss and rotor loss, the electric power conversion circuit controller outputs an actual control value for control of the inverter main circuit.
    Type: Grant
    Filed: February 17, 2014
    Date of Patent: November 21, 2017
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventor: Tetsuo Sugahara
  • Patent number: 9762157
    Abstract: An electronic switch controller, an electronic switch control method, an electronic switch and an electronic device are disclosed. The processor comprises voltage-stabilized power supplies, a processor and a driving circuit; the processor is connected between the voltage-stabilized power supplies and a measurement device to receive working parameters of the power supply, a load and the electronic switch measured by the measurement device, read duty cycle parameters matching with the working parameters, calculate a new duty cycle with the duty cycle parameters and the working parameters, adjust the current control signal to a PWM signal having the new duty cycle, and send the PWM signal to the driving circuit; and the driving circuit is connected between the voltage-stabilized power supplies and the load to control the rotation speed of the motor in the load.
    Type: Grant
    Filed: December 21, 2012
    Date of Patent: September 12, 2017
    Assignee: Kangxin Partners, P.C.
    Inventor: Zhengbing Liu
  • Patent number: 9755558
    Abstract: Systems and methods for controlling the operating speed and the torque of an electric motor using an operational model are described. An operational model for the electric motor, including a plot of engine performance parameters, is used for reference, and a most efficient output path, which may pass through an optimal operation region in the operational model, is selected. The most efficient output path may be determined, for example, according to locations of a current output state and a to-be-reached target state in the operational model, enabling the operating state of the motor to reach the target state from the current operating state. By selecting a more efficient output path, the operating efficiency of the motor may be optimized, the life of a battery improved and/or the operating mileage of the vehicle may be increased, without significantly reducing the driving experience.
    Type: Grant
    Filed: December 14, 2015
    Date of Patent: September 5, 2017
    Assignee: THUNDER POWER NEW ENERGY VEHICLE DEVELOPMENT COMPANY LIMITED
    Inventor: Sheng-Fu Lai
  • Patent number: 9739515
    Abstract: A heat pump device includes a compressor including a compression mechanism that compresses a refrigerant and a motor that drives the compression mechanism, an inverter that applies a voltage for driving the motor, a converter that applies a voltage to the inverter, an inverter control unit that generates a driving signal for driving the inverter, and a converter control unit that generates a driving signal for driving the converter. The inverter control unit includes a heating-operation-mode control unit that controls a driving-signal generating unit such that the driving-signal generating unit outputs, as inverter driving signals, PWM signals for heating the compressor without rotationally driving the motor by feeding a high-frequency current that the motor cannot follow in a heating operation mode.
    Type: Grant
    Filed: April 16, 2012
    Date of Patent: August 22, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shota Kamiya, Kazunori Hatakeyama, Kenta Yuasa, Shinya Matsushita, Shinsaku Kusube, Tsutomu Makino
  • Patent number: 9722522
    Abstract: A method for limiting the torque of a permanent magnet AC motor includes a torque limit controller. The torque limit controller at least in part bases the torque limit on a selected direct voltage limit. The selected direct voltage limit may be used in combination with other torque limit conditions to generate the torque demand for the AC motor.
    Type: Grant
    Filed: April 1, 2015
    Date of Patent: August 1, 2017
    Assignee: CANRIG DRILLING TECHNOLOGY LTD.
    Inventor: Gary Pace
  • Patent number: 9698700
    Abstract: A power converter can be controlled to generate a target output power. The control process may include obtaining a target current reference for the power converter, sensing an output current of the power converter, and determining a difference between the target current reference and the sensed output current. The next switching duty cycle for the next switching period of the switching circuits in the power converter can be derived based on at least the present switching duty cycle of the present switching period, and the difference between the target current reference and the sensed output current. The switching circuits of the power converter can then be switched according to the derived next switching duty cycle in the next switching period.
    Type: Grant
    Filed: March 11, 2015
    Date of Patent: July 4, 2017
    Assignees: DRS Consolidated Controls, Inc., University of Connecticut
    Inventors: Scott Ramsay, Michael Kelley, Matthew Tarca, John Thompson, David Gellis, Thomas Parsons, Sung Yeul Park, Sungmin Park
  • Patent number: 9649953
    Abstract: A method for operating an electrical machine, in particular for making available drive power for a drive train of a motor vehicle, the electrical machine being controlled by several phase currents, the method including sensing an electrical variable that represents the torque delivered by the electrical machine; and monitoring the torque. A degradation of the electrical machine is taken into consideration in the monitoring of the torque.
    Type: Grant
    Filed: October 4, 2011
    Date of Patent: May 16, 2017
    Assignee: Robert Bosch GmbH
    Inventors: Roland Schleser, Daniel Kanth, Holger Niemann, Andreas Heyl
  • Patent number: 9634593
    Abstract: A method of operating an electric motor is disclosed. The method includes: starting the electric motor in an open loop control mode; operating an estimator that estimates operating conditions of the electric motor; and, while the electric motor is in the open loop control mode, evaluating a first parameter of the estimator. The method further includes: in response to the evaluation of the first parameter, determining whether the estimator has converged; and in response to a determination that the estimator has not converged within a predetermined period of time after starting the electric motor, signaling a first fault condition.
    Type: Grant
    Filed: April 26, 2013
    Date of Patent: April 25, 2017
    Assignee: Emerson Climate Technologies, Inc.
    Inventors: Joseph G. Marcinkiewicz, Charles E. Green, Michael I. Henderson
  • Patent number: 9621063
    Abstract: A power converter can be controlled to generate a target output power based on a reactive power reference and an active power reference. The control process may include monitoring a time-varying power signal (e.g., a power grid voltage signal from a power grid), and filtering the time-varying power signal to derive a filtered sine component of the time-varying power signal and a filtered cosine component of the time-varying power signal. A sine coefficient and cosine coefficient each based on at least the reactive power reference and the active power reference can be determined, and applied to the filtered sine component and filtered cosine component of the time-varying power signal, respectively. A target current reference of the power converter can then be set to include a sum of the current reference sine component and the current reference cosine component.
    Type: Grant
    Filed: March 11, 2015
    Date of Patent: April 11, 2017
    Assignee: DRS Consolidated Controls, Inc.
    Inventors: Scott Ramsay, Michael Kelley, Matthew Tarca, John Thompson, David Gellis, Thomas Parsons, Sung Yeul Park, Sungmin Park
  • Patent number: 9590530
    Abstract: A modular converter having a plurality of converter modules for converting an input voltage into an output voltage to be supplied to a load by receiving a control input reference vector, a control input vector and a control input parameter vector; determining a control output reference vector from the control input reference vector, the control input vector and the control input parameter vector in a first control stage; and controlling the converter modules by generating switching signals based on the control output reference vector in a further control stage.
    Type: Grant
    Filed: February 24, 2015
    Date of Patent: March 7, 2017
    Assignee: ABB Schweiz AG
    Inventor: Tobias Geyer
  • Patent number: 9425618
    Abstract: A power supply device includes: an input determination section configured to determine which one of a commercial power supply and a power generator is an input power supply, and to generate a determination signal; a conversion section of a switching type configured to convert an input voltage into an output voltage; and a drive-signal generation section configured to be supplied with determination output from the input determination section, and to generate a switching drive signal for the conversion section, the drive-signal generation section being configured to serve as a power-factor correction control section and to generate the switching drive signal when the determination signal indicates that the commercial power supply is the input power supply, and being configured to serve as a maximum power point tracking control section and to generate the switching drive signal when the determination signal indicates that the power generator is the input power supply.
    Type: Grant
    Filed: October 3, 2013
    Date of Patent: August 23, 2016
    Assignee: Sony Corporation
    Inventor: Shun Nagashima
  • Patent number: 9425730
    Abstract: The present application discloses an apparatus including: a motor model that reflects a characteristic of a motor and includes at least inputs pertaining to a first quantity of state and a second quantity of state and an output pertaining to a third quantity of state; a comparator that calculates a difference between the third quantity of state in an actual motor and the third quantity of state output from the motor model; and an amplifier that amplifies an output of the comparator at a predetermined gain. The first quantity of state in the actual motor is input into the motor model as the first quantity of state, and an output of the amplifier is input into the motor model as the second quantity of state. The apparatus then uses the output of the amplifier as an estimated value of the second quantity of state in the actual motor.
    Type: Grant
    Filed: January 19, 2012
    Date of Patent: August 23, 2016
    Assignee: MAKITA CORPORATION
    Inventors: Masahiko Sako, Hirokatsu Yamamoto, Takaaki Osada
  • Patent number: 9344028
    Abstract: A traction motor system calculates motor flux by generating a real time effective resistance of a resistance grid calculated from motor torque and measured voltage on a DC link. Calculating effective resistance avoids solely relying on DC link voltage, which can be influenced by conditions such as wheel slip and drop out of one or more resistance grids. The effective resistance calculation is based on nominal motor values using known power levels and conditions. From these nominal values and the effective resistance, various scaling factors based on actual motor power can be generated and used to adjust a nominal flux reference to more accurately reflect actual motor flux. The scaling factors include power and torque scaling factors and a resistance scaling factor that is active during conditions such as wheel slip.
    Type: Grant
    Filed: October 16, 2014
    Date of Patent: May 17, 2016
    Assignee: Caterpillar Inc.
    Inventors: Alexander Cameron Crosman, III, Joshua M. Williams
  • Patent number: 9337657
    Abstract: A system is provided that includes a plurality of power units each configured to supply power. Additionally, the system includes a plurality of contacts each configured to toggle an electrical connection of each of the plurality of power units as a network. Moreover, the network is configured to supply power to a load. Furthermore, the system includes a controller configured to control when each of the plurality of contacts toggle according to a power state, and the power state includes information regarding a charge of each power unit, a load demand, and a supplied power being supplied by the plurality of power units.
    Type: Grant
    Filed: November 28, 2012
    Date of Patent: May 10, 2016
    Assignee: General Electric Company
    Inventor: Robert Gregory Wagoner
  • Patent number: 9294024
    Abstract: A motor drive device according to one embodiment of the present invention includes a converter (2) for converting an AC voltage input from a main power supply into a DC voltage, a DC link unit (4) for rectifying the DC voltage output from the converter, an inverter (10) for converting the DC voltage rectified by the DC link unit into an AC voltage for driving a motor using a semiconductor switching element, a voltage application unit (6) that is provided independently of the main power supply to apply a voltage to the DC link unit, a voltage detector (7) for detecting a voltage of the DC link unit after application of the voltage by the voltage application unit, and an abnormality determination unit (8) for determining the presence or absence of an abnormality of the DC link unit based on the voltage detected by the voltage detector.
    Type: Grant
    Filed: April 18, 2014
    Date of Patent: March 22, 2016
    Assignee: FANUC CORPORATION
    Inventor: Youichirou Ooi
  • Patent number: 9257935
    Abstract: A motor control apparatus and method are provided. The motor control apparatus may include a power supply device supplying power to a motor, a power control device selectively blocking current supplied to the motor depending on whether or not the current supplied from the power supply device to the motor is greater than a reference current value, a controller that controls an intensity of the current supplied from the power supply device to the motor, and a load torque detector that detects a load torque generated by the motor as the motor rotates. The controller controls a maximum value of the current to be supplied to the motor so that the maximum value is less than the reference current value when the maximum value of the load torque detected by the load torque detector is greater than a maximum motor output due corresponding to the reference current value.
    Type: Grant
    Filed: January 22, 2014
    Date of Patent: February 9, 2016
    Assignee: LG ELECTRONICS INC.
    Inventors: Juhyoung Lee, Jinhee Noh
  • Patent number: 9217429
    Abstract: A linear compressor which can perform the natural cooling capacity modulation, even if a capacitor connected to a motor is removed. The linear compressor includes a fixed member having a compression space therein, a movable member linearly reciprocated in the fixed member to compress a refrigerant sucked into the compression space, and one or more springs provided to elastically support the movable member in the motion direction of the movable member. The compressor also includes a motor connected to the movable member to linearly reciprocate the movable member in the axial direction, and a motor control unit performing the cooling capacity modulation by the reciprocation of the movable member according to a load, by controlling an AC voltage applied to the motor so that a stroke of the movable member can be proportional to the magnitude of the AC voltage applied to the motor.
    Type: Grant
    Filed: July 30, 2012
    Date of Patent: December 22, 2015
    Assignee: LG ELECTRONICS INC.
    Inventors: Jin Seok Hu, Shin Hyun Park, Yong Tae Kim, Hoon Bong Lee, Kye Lyong Kang
  • Patent number: 9209735
    Abstract: A control system for an electric three-phase variable speed motor includes an inverter for providing power to the motor and a control arrangement for controlling the inverter. The control arrangement includes a d and q axis currents determining module configured to repeatedly determine d and q axis currents based on detected currents of the motor. An MTPA control block repeatedly generates reference d and q axis currents based on the determined d and q axis currents and a ratio value such that the ratio of the reference d and q axis currents is equal to the ratio value, which is set to unity. A switching signal generation module repeatedly generates switching signals to control the inverter based on the reference d and q axis currents. A fine adjustment module calculates a magnitude of a current or power of the motor and determines an optimum compensation ratio value.
    Type: Grant
    Filed: December 31, 2014
    Date of Patent: December 8, 2015
    Assignee: ABB Technology Ltd
    Inventor: Rahul Kanchan
  • Patent number: 9209736
    Abstract: A control method includes monitoring changes in torque produced by a traction motor when an excitation frequency of current supplied to the traction motor changes, determining if the torque produced by the traction motor decreases when the excitation frequency of the current supplied to the traction motor increases, and responsive to the torque produced by the traction motor decreasing when the excitation frequency increases, preventing the excitation frequency of the current supplied to the traction motor from increasing further.
    Type: Grant
    Filed: August 8, 2013
    Date of Patent: December 8, 2015
    Assignee: General Electric Company
    Inventor: Jeffrey Louis Daigle
  • Patent number: 9184691
    Abstract: A method for controlling an electric drive, having an inverter, an electric motor and control means configured in a first operating state of the electric drive to control the electric drive to run in a constant operating point, determine and store a value of an output voltage of the inverter or a value of a flux reference of the inverter, and a value of a switching frequency of the inverter with which a determined input power of the electric drive is lowest. The controller is configured in a second operating state of the electric drive to control the electric drive to use the stored values to run in the operating point.
    Type: Grant
    Filed: June 27, 2014
    Date of Patent: November 10, 2015
    Assignee: ABB TECHNOLOGY OY
    Inventors: Mikko Vertanen, Markku Lyyjynen, Juha Suvanto, Juha Saukko
  • Patent number: 9130487
    Abstract: A hybrid-electric vehicle and method of controlling a hybrid-vehicle is provided. The vehicle includes a traction battery, at least one electric-machine, and a controller. The controller is configured to alter a voltage between the battery and the electric-machine based on a measured voltage of the battery or the high voltage bus. In response to an indication that the measured voltage is faulty during a drive cycle, the controller instead alters the voltage between the battery and the electric machine based on a substituted battery voltage signal such that the electric-machine remains operable for the drive cycle.
    Type: Grant
    Filed: November 30, 2012
    Date of Patent: September 8, 2015
    Assignee: FORD GLOBAL TECHNOLOGIES, LLC
    Inventors: Rimma Isayeva, David Crist Gabriel, Michael W. Degner, Yuqing Tang, Hongjie Wu
  • Patent number: 9106162
    Abstract: A hybrid-electric vehicle method of controlling a hybrid electric vehicle is provided. The vehicle includes a traction battery, at least two electric-machines, and a controller. The controller is configured to, in response to a faulted condition one of the electric-machines during a drive cycle, command the other of the electric-machines to function in a mode in which torque output is restricted to a threshold value that depends on a voltage of the battery to maintain vehicle propulsion during the drive cycle.
    Type: Grant
    Filed: November 29, 2012
    Date of Patent: August 11, 2015
    Assignee: Ford Global Technologies, LLC
    Inventors: Rimma Isayeva, Balakrishna Rao, Jonathan Andrew Butcher
  • Patent number: 9041335
    Abstract: A driver circuit for driving an electrical load includes an input terminal pole connecting the driver circuit to an AC voltage source, an output terminal pole connecting the driver circuit to the load, a rectifier circuit connected to the input terminal pole for converting an AC voltage into a pulsating DC voltage, and a control element connected to the rectifier circuit and to the output terminal pole. The control element has a switch and a controller, the controller switching the switch on and off by means of a pulse train signal, wherein an electrical output value of the driver circuit is adjustable by switching the switch. The controller is configured to vary at least one time-based value of the pulse train signal within one period of the pulsating DC voltage such that a driver current is adjusted at the output terminal pole having a defined waveform within the period.
    Type: Grant
    Filed: March 20, 2013
    Date of Patent: May 26, 2015
    Assignee: C. & E. FEIN GMBH
    Inventors: Martin Beichter, Mark Heilig, Ulf Rinckleb, Heinrich Steinhart
  • Patent number: 9041402
    Abstract: There is provided a method for determining an abnormality during operation of a high voltage disconnect switch, the method comprising: determining a current position of an arm of the high voltage disconnect switch operatively connected to a motor, the motor being operated for driving the arm of the high voltage disconnect switch; determining a torque of the motor corresponding to the current position of the arm; comparing the torque of the motor to a torque threshold for the current position of the arm; and outputting an abnormality signal based on the comparison.
    Type: Grant
    Filed: December 8, 2010
    Date of Patent: May 26, 2015
    Assignee: EHT INTERNATIONAL INC.
    Inventors: Patrick Lalonge, Robert Jeanjean
  • Patent number: 8988026
    Abstract: Single-phase voltage operation techniques are provided for a three-phase drive system. A drive system may include a rectifier configured to couple to a three-phase AC voltage source. The rectifier may be configured to convert AC voltage from the three-phase AC voltage source to a direct current (DC) voltage. The drive system may also include a controller configured to send a plurality of switching signals to a plurality of switches in the rectifier such that the plurality of switching signals minimizes a current provided to the rectifier when only a single-phase of the three-phase AC voltage source is available.
    Type: Grant
    Filed: July 31, 2012
    Date of Patent: March 24, 2015
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Ahmed Mohamed Sayed Ahmed, Lixiang Wei, Brian J. Seibel
  • Patent number: 8975847
    Abstract: A power conversion device includes a first capacitor connected in parallel to a direct-current power supply, plural power converters that drive plural synchronous machines, a second capacitor connected in parallel to a direct-current side of power converters, a switching circuit inserted between the first and second capacitors, a switch-start instruction unit that controls starting of an operation of the power converters, and a control unit that controls the power converters based on a motor velocity and a voltage of the first capacitor. The switch-start instruction unit turns off the switching circuit while the power converters stop, turns off the switching circuit until a terminal voltage of each of the synchronous machines becomes equal to a predetermined value when each of the power converters starts operating, and turns on the switching circuit when the terminal voltage of each synchronous machine becomes equal to or smaller than the predetermined value.
    Type: Grant
    Filed: March 26, 2010
    Date of Patent: March 10, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventor: Masaki Kono
  • Patent number: 8947038
    Abstract: A power supply apparatus of a home appliance which meets standby power regulation of 0.5 watts using one SMPS. As compared with a general circuit which meets the standby power regulation using two or more SMPSs, it may be possible to curtail expenses required for addition of a separate standby only SMPS and miniaturize a PCB, resulting in a reduction in cost. Further, in a washing machine employing a motor, a circuit is provided to bypass a back EMF generated in the motor even if AC power is not supplied to the washing machine due to occurrence of a power failure or unplugging of the washing machine. Therefore, it may be possible to prevent a PCBA from being damaged due to the back EMF.
    Type: Grant
    Filed: February 1, 2013
    Date of Patent: February 3, 2015
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jong Hun Won, Tae Hoon Lim
  • Patent number: 8884567
    Abstract: In a system for controlling a rotary machine, a circuit outputs an AC voltage to be applied to a rotary machine. A storage stores therein measurement-error information indicative of a measurement error of the measuring unit. A torque-feedback adjuster manipulates a phase of the output voltage of the circuit based on the rotational angle of the rotary machine measured by a measuring unit and the measurement-error information to adjust a torque of the rotary machine to a request torque. The phase is obtained from information fed back from the rotary machine. An abnormality determiner determines whether there is an abnormality to disable using accurate measurement-error information. A limiter limits adjustment of the torque of the rotary machine to the request torque by the torque-feedback adjuster when it is determined that there is an abnormality to disable using accurate measurement-error information.
    Type: Grant
    Filed: December 2, 2011
    Date of Patent: November 11, 2014
    Assignee: Denso Corporation
    Inventors: Tomohiro Senkou, Hiroshi Inamura, Koichi Nishibata