Including Inverter Patents (Class 318/801)
  • Patent number: 9985566
    Abstract: A system and/or method for controlling a dual-three-phase machine with respect to a power electronics inverter is provided. The dual-three-phase machine includes six phase windings divided into at least two windings groups configured to provide a combination of six voltages that achieve zero common-mode voltage and a significantly reduced common-mode noise current.
    Type: Grant
    Filed: April 18, 2016
    Date of Patent: May 29, 2018
    Assignee: OTIS ELEVATOR COMPANY
    Inventor: Dong Jiang
  • Patent number: 9954433
    Abstract: Power supply and drive device for a permanent magnet motor including a full-wave voltage rectifier stage, which can be supplied with an alternating current voltage to provide a rectified voltage, a power factor corrector stage, a smoothing capacitor to provide a direct current voltage and a motor drive stage, which is supplied with the direct current voltage and provides a signal indicating the power required by the motor. The smoothing capacitor is not of the electrolytic type and the power factor corrector stage has feedback control means to generate a reference current as a function of the direct current voltage and of the signal indicating the power required and to control an input current of the power factor corrector stage as a function of the reference current.
    Type: Grant
    Filed: April 26, 2017
    Date of Patent: April 24, 2018
    Assignee: Phase Motion Control S.p.A.
    Inventors: Marco Venturini, Marco Calvini
  • Patent number: 9954467
    Abstract: Provided is a motor control device controlling several motors independently. The motor control device includes a plurality of inverters supplying power to each of several motors, respectively, and a control CPU provided with a command generator generating a control command, a PI controller that generates a torque command and a speed command by performing a proportional integral operation using feedback information and the control command transmitted from the command generator, and a vector controller that generates a PWM control signal using the torque command and the speed command and supplies the generated PWM signal to the plurality of inverters, in which the command generator includes an input translator that converts the command input as a QMCL command into the control command.
    Type: Grant
    Filed: July 26, 2017
    Date of Patent: April 24, 2018
    Assignee: HANSA Co., Ltd.
    Inventors: Yong-Gil Kwon, Takamitsu Ishii
  • Patent number: 9948224
    Abstract: A system and method for position sensorless control of an AC electric machine is disclosed. A drive system for driving an AC electric machine provides a primary current excitation to drive the AC electric machine, the primary current excitation comprising a current vector having a magnitude and angle. The drive system injects a carrier signal to the AC electric machine that is superimposed onto the current vector, with the carrier signal being selected to generate a carrier response signal that has sensitivity to magnetic alignment information of the AC electric machine at its operating point. The drive system measures at least one magnetic alignment signature of the AC electric machine from the generated carrier response signal and controls an orientation of the current vector using the measured at least one magnetic alignment signature, so as to achieve a desired magnetic operation of the AC electric machine.
    Type: Grant
    Filed: October 17, 2016
    Date of Patent: April 17, 2018
    Assignee: General Electric Company
    Inventors: Kum-Kang Huh, Di Pan
  • Patent number: 9919615
    Abstract: Circuits, methods, and systems for driving a load are described. An exemplary driving circuit may include a plurality of switching devices and a controller electrically connected to the switching devices. The controller may be configured to receive a reference voltage signal indicating a target voltage for the driving circuit to generate to drive the load. The reference voltage signal may correspond to a reference space vector in a reference frame. The controller may also be configured to determine that the reference space vector falls within a holding region in which the reference voltage signal is subject to over-modulation. The controller may then generate an adjusted reference voltage signal by adjusting the reference space vector to match a predetermined space vector associated with the holding region. In addition, the controller may be configured to provide the adjusted reference voltage signal to the plurality of switching devices to drive the load.
    Type: Grant
    Filed: June 20, 2016
    Date of Patent: March 20, 2018
    Assignee: FARADAY & FUTURE INC.
    Inventors: Stefan Grubic, Mengwei Campbell
  • Patent number: 9899917
    Abstract: In a method for generating with a modular multilevel power converter (M2C) having a plurality of sub-modules a frequency-variable output voltage, the sub-modules are switched on and off to generate from an input voltage discrete voltage steps approximating an approximately sinusoidal alternating output voltage having a first angular frequency located between a zero frequency and a second angular frequency, and the input voltage is controlled or regulated as a function of the first angular frequency so as to be located between a lower angular frequency, which is equal to or greater than the zero frequency, and a third angular frequency, such that the input voltage increases with increasing first angular frequency, thereby reducing capacitor complexity in the power converter.
    Type: Grant
    Filed: March 30, 2012
    Date of Patent: February 20, 2018
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Hans Baernklau, Steffen Bernet, Albrecht Gensior, Jens Weber
  • Patent number: 9887648
    Abstract: A variable frequency motor drive comprises a converter including a rectifier having an input for connection to an AC power source and converting the AC power to DC power. A DC bus is connected to the rectifier circuit. At least one bus capacitor is across the DC bus. An inverter receives DC power from the DC bus and converts the DC power to AC power to drive a motor. A controller is operatively connected to the converter. The controller comprises a speed control controlling the inverter responsive to a speed command to maintain a desired motor speed. A speed foldback control measures DC bus ripple voltage and regulates the speed command responsive to the measured DC bus ripple voltage.
    Type: Grant
    Filed: October 31, 2013
    Date of Patent: February 6, 2018
    Assignee: Yaskawa America, Inc.
    Inventors: Joseph Raymond Pottebaum, John Alan Cairo, Brian W. Geoffrey, William C. Phillips
  • Patent number: 9887547
    Abstract: A method and an apparatus for decoupling output power of an inverter are provided. The method comprises: obtaining voltage amplitude instruction E* and voltage phase instruction ?* according to an output voltage and an output current of the inverter; obtaining an amplitude feedforward amount Eff and a phase feedforward amount ?ff according to an amplitude U of a grid voltage of the power grid, an amplitude E of the output voltage of the inverter, and a phase difference ? between the output voltage of the inverter[0] and the grid voltage; obtaining a reference voltage amplitude Eref according to the voltage amplitude instruction E* and the amplitude feedforward amount Eff, and obtaining a reference voltage phase ?ref according to the voltage phase instruction ?* and the phase feedforward amount ?ff; and regulating the output power of the inverter using the reference voltage amplitude Eref and the reference voltage phase ?ref.
    Type: Grant
    Filed: November 23, 2016
    Date of Patent: February 6, 2018
    Assignees: DELTA ELECTRONICS (SHANGHAI) CO.,LTD., XI'AN JIAOTONG UNIVERSITY
    Inventors: Jinjun Liu, Baojin Liu, Zeng Liu, Teng Wu, Shike Wang
  • Patent number: 9880223
    Abstract: A method of estimating stator resistance of an induction motor is provided. The method includes applying voltage pulses through two phase paths of the motor for a plurality of electrical cycles to inject current in the motor, wherein the voltage pulses are applied until rotor flux of the motor is substantially stabilized and measuring stator voltage and stator current in response to the applied voltage pulses for each of the plurality of electrical cycles. The method also includes calculating the stator resistance based upon the measured stator voltages and the stator currents.
    Type: Grant
    Filed: June 3, 2014
    Date of Patent: January 30, 2018
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: David M. Messersmith, Douglas J. Bader, Haihui Lu, Thomas A. Nondahl, Zhenhuan Yuan
  • Patent number: 9871482
    Abstract: A power conversion device includes a high-pass filter for extracting an AC component of voltage Vdc of a DC link section, a multiplier for multiplying output VdcAC of the high-pass filter by a first gain K1 and outputting the result, a multiplier for multiplying output of the multiplier by a second gain K2 and outputting the result as a d-axis voltage correction signal vdcmp*, and a multiplier for multiplying output of the multiplier by a third gain K3 and outputting the result as a q-axis voltage correction signal vqcmp*. The gate signal generation section generates gate signals on the basis of a signal vd1 obtained by adding the d-axis voltage correction signal vdcmp* to a d-axis voltage command value vd* and a signal vq1 obtained by adding the q-axis voltage correction signal vqcmp* to a q-axis voltage command value vq*.
    Type: Grant
    Filed: June 15, 2015
    Date of Patent: January 16, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shuta Ishikawa, Masanori Kato, Shotaro Marumoto, Ryuichi Takezawa, Shunichi Nishimura
  • Patent number: 9862276
    Abstract: A vehicle power system includes a controller configured to issue commands to open a selected set of switches of an inverter and then to operate the selected set of switches according to a pulse width modulation signal having an increasing duty cycle such that input current to a battery is driven towards zero and a magnitude of d-axis current of the drive system is reduced in response to a fault with an electric drive system.
    Type: Grant
    Filed: May 19, 2016
    Date of Patent: January 9, 2018
    Assignee: Ford Global Technologies, LLC
    Inventors: Lihua Chen, Yan Zhou, Shuitao Yang
  • Patent number: 9859808
    Abstract: Systems and methods associated with example power converter systems are disclosed. For instance, a power converter system can include a power converter couplable to an input power source and configured to generate an output power substantially at a grid frequency. The power converter can include one or more inverter bridge circuits, each associated with an output phase of the power converter. Each inverter bridge circuit can include one or more first switching modules having a pair of switching elements coupled in series with one another, and an output coupled between the pair of switching elements. At least one switching element of each first switching module includes a reverse blocking transistor. The power converter further includes one or more input bridge circuits having a plurality of second switching modules coupled in parallel, each second switching module comprising a pair of silicon carbide transistors.
    Type: Grant
    Filed: April 26, 2016
    Date of Patent: January 2, 2018
    Assignee: General Electric Company
    Inventors: Robert Gregory Wagoner, Harold Robert Schnetzka, Lukas Mercer Hansen, Wayne Allen Schultz, Bennett Steven Sheron, Douglas Austin
  • Patent number: 9859822
    Abstract: A control system to realize input power changing along with both loads and rotate speed by an inverter bridge dragging many sets of motors, is composed of a stator voltage regulating unit (1), a motor unit (2), a rotor speed control unit (3), an inverter bridge unit (4), a control drive unit (5) and a signal processing unit (6). By setting a power factor sensor, the phase voltage and phase current of the motor stator are acquired as a control signal to regulate the input power so as to make it change with loads. At the same time, by setting a voltage sensor and a current sensor, motor rotor phase voltage, rectifier output current, overvoltage protection current and chopper working current are acquired separately as a control signal to regulate the input power so as to make it change with the rotate speed, thus realizing input power changing along with both loads and rotate speed.
    Type: Grant
    Filed: June 28, 2012
    Date of Patent: January 2, 2018
    Inventor: Shunxin Zhou
  • Patent number: 9845013
    Abstract: A controller of an AC electric vehicle includes a first specific-frequency-current computation unit that extracts a current component corresponding to a first specific frequency set value from a main-transformer output current and outputs the current component as a first specific-frequency current, a subtractor that subtracts the first specific-frequency current from the main-transformer output current and outputs a subtraction result as a current deviation, a second specific-frequency-current computation unit that extracts a current component corresponding to a second specific frequency set value from the current deviation and outputs the current component as a second specific-frequency current, and a power-failure detection unit that compares the second specific-frequency current with a predetermined power-failure detection-current set value and outputs a power-failure detection signal when the second specific-frequency current is larger than the power-failure detection-current set value.
    Type: Grant
    Filed: June 29, 2012
    Date of Patent: December 19, 2017
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Tetsuo Sugahara, Takumi Uemura
  • Patent number: 9827857
    Abstract: A power supply device includes a battery, an inverter, a converter, an electronic control unit. The inverter includes an upper arm having a third switching element and a lower arm having a fourth switching element. The converter includes an upper arm having a first switching element and a lower arm having a second switching element. The electronic control unit is configured to, when a state where the primary-side voltage is at least equal to the specified threshold continues for a specified time or longer, i) increase the primary-side voltage by repeatedly switching the second switching element between ON and OFF state while maintaining the first switching element to be OFF state, and apply the increased voltage as the secondary-side voltage to the inverter, and ii) convert the secondary-side voltage to the AC voltage by repeatedly switching each of the third and the fourth switching element between ON and OFF state.
    Type: Grant
    Filed: March 2, 2016
    Date of Patent: November 28, 2017
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kota Suzuki, Tomoko Oba
  • Patent number: 9815161
    Abstract: A backlash automatic detection system comprises a control device and a machine tool. The machine tool comprises a servo driver, a lead screw, a nut seat and a platform. The method comprises: entering an initial state and outputting a control command to the servo driver through the control device; driving the lead screw by the servo driver to move the nut seat towards a first direction and changing the movement direction of the nut seat towards a reverse second direction by the servo driver; defining a backlash phenomenon period according to one time point at which the nut seat starts to move towards the second direction and another time point at which the platform is driven to move by the nut seat; defining the displacement of the nut seat corresponding to the backlash phenomenon period as a backlash value.
    Type: Grant
    Filed: December 26, 2014
    Date of Patent: November 14, 2017
    Assignee: Industrial Technology Research Institute
    Inventors: Yi-Ying Lin, Shih-Je Shiu, Che-Wei Hsu, Po-Hsun Wu, Chien-Yi Lee
  • Patent number: 9816737
    Abstract: A DC power-supply device that suppresses an excessive inrush current, can prevent breakage of elements and burnout of circuits, and converts alternating current from a three-phase AC power supply into direct current to supply it to a load, includes a rectifier circuit having a reactor connected to input or output side thereof and rectifying the alternating current from the three-phase AC power supply; first and second capacitors and connected in series between output terminals to the load; a charging unit selectively charges one or both of the first and second capacitors; and a control unit controlling the charging unit. When charging of the first and second capacitors is started, the control unit reduces the on-duty ratio, and then, until the on-duty ratio during a normal operation is reached, the control unit executes control such that the on-duty ratio is gradually increased as a predetermined time period is passed.
    Type: Grant
    Filed: October 29, 2013
    Date of Patent: November 14, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shota Kamiya, Kazunori Hatakeyama, Norikazu Ito, Kenta Yuasa, Shoji Isoda
  • Patent number: 9813000
    Abstract: A method and system for maintaining consistent output for a pump powered by an electric motor, is provided, including: sending electrical measurements regarding power applied to the motor to a controller; determining if the electrical measurements indicate a power variation; changing the parameters of output from the motor to compensate for the variation. The system uses a controller configured to receive electrical measurements regarding power input to the motor, to determine if the electrical measurements indicate a power variation; and to change the parameters of output from the motor to compensate for the variation.
    Type: Grant
    Filed: December 18, 2015
    Date of Patent: November 7, 2017
    Assignee: SIRIUS INSTRUMENTATION AND CONTROLS INC.
    Inventors: Kirby Jabusch, Colin Bussiere
  • Patent number: 9806648
    Abstract: In a motor control device that can perform more appropriate motor control, a switching arm has a first upper FET, a second upper FET, and a lower FET connected in series to one another. A source electrode of the second upper FET and a drain electrode of the lower FET are connected to each other via an intermediate line. The intermediate line is connected to a U-phase motor coil of a motor via a power line. The first upper FET, the second upper FET, and the lower FET are each provided with a parasitic diode that prevents current from flowing from a battery side to a ground side. A phase opening relay FET is provided on the U-phase power line. A parasitic diode of the phase opening relay FET is provided such that a current is not applied from the U-phase motor coil to the U-phase switching arm.
    Type: Grant
    Filed: April 7, 2016
    Date of Patent: October 31, 2017
    Assignee: JTEKT CORPORATION
    Inventor: Shunsuke Sugiura
  • Patent number: 9800177
    Abstract: A conversion device includes: a DC bus provided between a DC power supply and an AC power supply; a first converter provided between the DC power supply and the DC bus to perform DC/DC conversion; a second converter provided between the DC bus and the AC power supply to perform DC/AC or AC/DC conversion; and a control unit configured to selectively cause the first converter and the second converter to operate within one cycle of the AC power supply, to alternately generate a part of an absolute value of an AC waveform, and a DC waveform, as voltage of the DC bus, wherein the control unit adds a compensation value in a positive direction, to a voltage target value for the DC bus, at a timing that should have corresponded to a discontinuity point where the AC waveform and the DC waveform are connected to each other.
    Type: Grant
    Filed: February 18, 2016
    Date of Patent: October 24, 2017
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Naoki Ayai, Takashi Fumino, Yoshiharu Nakajima
  • Patent number: 9787170
    Abstract: Provided are a solar panel (1), a first DC/DC conversion circuit (13), a DC/AC conversion circuit (21) connected via a DC bus (25), a second DC/DC conversion circuit (17) for controlling bus voltage in the case of power outage, a first control section (14) having two kinds of control modes and controlling the first DC/DC conversion circuit (13), a second control section (18) for controlling the second DC/DC conversion circuit (17), and a third control section (22) for controlling the DC/AC conversion circuit (21). The second control section (18) controls bus voltage in the case of power outage, and the first control section (14) switches the control mode based on information of the second control section (18).
    Type: Grant
    Filed: September 26, 2012
    Date of Patent: October 10, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Sadayuki Inoue, Hideki Kawano
  • Patent number: 9755473
    Abstract: A motor structure is provided. The motor structure has: a motor; a circuit board including a driver circuit for controlling the motor; an upper shell; a base; a lower shell; an outlet, wherein wires of the circuit board is connected to the exterior of the motor structure through the outlet; a first tight chamber, formed by closing the upper shell and the base together, wherein the motor is disposed in the first tight chamber; and a second tight chamber, formed by closing the base and the lower shell together, wherein the circuit board is disposed in the second tight chamber.
    Type: Grant
    Filed: May 15, 2014
    Date of Patent: September 5, 2017
    Assignee: DELTA ELECTRONICS, INC.
    Inventors: Chin-Chu Hsu, Cheng-Chia Hsiao, Hsiu-Wei Wu
  • Patent number: 9727183
    Abstract: A method of operating a touch screen sensor integrated circuit includes: receiving a plurality of current signals through a plurality of pins, wherein each current signal is generated according to mutual capacitance in response to a modulation signal; sensing the current signals and generating a plurality of sensed current signals corresponding to each of the current signals; and generating a plurality of subtracted current signals, wherein each subtracted current signal is generated by performing a subtraction on sensed current signals corresponding to a pair of the pins.
    Type: Grant
    Filed: September 4, 2014
    Date of Patent: August 8, 2017
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: San Ho Byun, Jun Chul Park, Ki Duk Kim, Yoon Kyung Choi
  • Patent number: 9698722
    Abstract: A temperature estimation module estimates each junction temperature of a corresponding semiconductor device, among a plurality of semiconductor devices, for each phase of an inverter. The temperature estimation module or the data processing system determines a hottest device with a highest junction temperature among the semiconductor devices. A thermal adjustment module or data processing system determines if the highest junction temperature parameter is less than maximum junction temperature parameter for the respective semiconductor device or deciding whether or not to adjust a duty cycle of the semiconductor devices.
    Type: Grant
    Filed: August 27, 2015
    Date of Patent: July 4, 2017
    Assignee: DEERE & COMPANY
    Inventors: David M. Loken, Long Wu, Tianjun Fu, Robert B. Shaw, Neal D. Clements
  • Patent number: 9692337
    Abstract: A method (29) for controlling a synchronous reluctance electric motor (2) is suggested, wherein the electric voltage (7) that is applied to the synchronous reluctance electric motor (2) is controlled, and wherein the control of said electric voltage (7) is based on the electric current (14) in the d-q-reference frame (25, 26).
    Type: Grant
    Filed: June 11, 2013
    Date of Patent: June 27, 2017
    Assignee: Danfoss Drives A/S
    Inventor: Michael Laursen
  • Patent number: 9667181
    Abstract: A method of monitoring an electric motor circuit of the kind comprising an electric motor having a plurality of phases delta configuration, a plurality of electrical switches arranged in a bridge, operable in response to signals from a controller to selectively connect the phases to a power supply, the motor controller being responsive to a current error signal dependent on the difference between a demanded motor current value and an actual motor current value indicative of the actual current flowing in the motor where the method comprising the steps of processing at least one signal that is present in use of the electric motor circuit to identify a frequency component of the at least one signal that meets certain predefined criteria and in the event that the component is identified and that it does meet the criteria providing an indication that there is a fault.
    Type: Grant
    Filed: February 10, 2014
    Date of Patent: May 30, 2017
    Assignee: TRW Limited
    Inventor: Peter Geoffrey Scotson
  • Patent number: 9654021
    Abstract: Power converter modules and parallel conversion systems are presented in which the modules are provided in a rollable enclosure having AC and DC electrical connections, and an interior including a switching circuit with switching devices individually connected between a corresponding AC node and a corresponding DC node for operation as either a rectifier or an inverter and an internal filter circuit with inductors individually connected between a corresponding AC node of the switching circuit and a corresponding AC electrical connection, with a built-in blower or fan to cool the filter circuit during operation.
    Type: Grant
    Filed: October 9, 2013
    Date of Patent: May 16, 2017
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: Lixiang Wei, Robert M. Michalski, Yogesh Patel, Bruce W. Weiss, Brian P. Brown
  • Patent number: 9647600
    Abstract: The device according to the invention controls a polyphase inverter (10, 14, 17) intended for powering from a DC current source (CC) a polyphase rotating electric machine (1). The device is of the type of those generating commutation functions driving commutation elements (9, 13) of the inverter in such a way as to obtain a reduction of the losses in the commutation elements and a decrease of an effective current in a decoupling capacitor (16) of the source (CC). According to the invention, this reduction and this decrease are obtained by means of a set of control strategies (21, 24) determining the commutation functions by using additional degrees of freedom of the polyphase machine (1) with respect to a three-phase reference machine. The polyphase machine comprises first and second phase windings forming a first three-phase system (2, 3, 4) and a second three-phase system (5, 6, 7) with distinct neutral points (11, 15) offset angularly by a predetermined angle of offset (?).
    Type: Grant
    Filed: April 3, 2014
    Date of Patent: May 9, 2017
    Assignee: Valeo Equipement Electriques Moteur
    Inventors: Jean-Francois Duguey, Gilbert Konan, Francois-Xavier Bernard, Daniel Pereira, Laurent Domenger, Abdelaziz Azizi Samir, Son Ha Tran
  • Patent number: 9641034
    Abstract: A rotary machine includes two sets of three-phase stator winding wires and two sets of inverters connected to the same direct-current power supply. Alternating-current terminals of the inverters are respectively connected to the three-phase stator winding wires. Stator winding wires are housed in a plurality of slots to form a stator. The two sets of three-phase stator winding wires and the stator winding wires in the same phase of the sets are started to be wound from the slot positions, with phases thereof being different from each other by 180 degrees, among the plurality of slots and are finished being wound in the slot positions, with phases thereof different from each other by 180 degrees. Winding end points of the three-phase stator winding wires are respectively connected in common, and alternating-current voltages having the same magnitude and opposite phases are applied to the two sets of three-phase stator winding wire.
    Type: Grant
    Filed: October 9, 2013
    Date of Patent: May 2, 2017
    Assignee: Hitachi, Ltd.
    Inventors: Tomomichi Ito, Naohiro Kusumi, Noriaki Hino, Nobuhiro Kusuno, Aung Kothet
  • Patent number: 9640978
    Abstract: A protective circuit for an inverter is disclosed, the protective circuit comprising a safety element, a switching arrangement, and a control circuit, with the safety element being arranged in a feed line to the power element, and the switching device being switched to the safety element such that the switching arrangement bridges the safety element when the switching arrangement is in a conducting state. The control circuit is embodied such that it, upon receipt of one control pulse or several successive control pulses, emits a switching signal to a switching arrangement for a predetermined period of time, with the switching arrangement being switched through in case of periodic receipt of the control pulses and with the absence of the control pulse opening the switching arrangement after a predetermined period of time, and triggering a protection of the inverter by the safety element.
    Type: Grant
    Filed: December 17, 2015
    Date of Patent: May 2, 2017
    Assignee: ZIEHL-ABEGG SE
    Inventors: Marco Schnell, Samuel Werner, Dirk Nowosad
  • Patent number: 9634592
    Abstract: A method of estimating a rotational position of a motor having saliency includes the steps of a) superimposing, on a drive voltage to rotate a rotating portion of the motor, a measuring voltage having a predetermined frequency higher than a frequency of the drive voltage to generate a plurality of voltages, and supplying the plurality of voltages to a stationary portion of the motor; b) in parallel with step a), extracting a component of the predetermined frequency in a current flowing in the stationary portion as an extracted current; c) calculating a sum of squares of the extracted current and a phase-shifted current obtained by shifting a phase of the extracted current by ?/2 to acquire a composite signal related to an amplitude of the extracted current; and d) acquiring a rotational position of the rotating portion based on the composite signal.
    Type: Grant
    Filed: February 4, 2016
    Date of Patent: April 25, 2017
    Assignees: NIDEC SINGAPORE PTE., LTD., NIDEC CORPORATION
    Inventor: Ju Feng
  • Patent number: 9621072
    Abstract: A method for operating a multi-phase modular power inverter having DC input terminals and AC phase voltage output terminals connected to a load, phase modules connected between the DC input terminals, with each phase module composed of valve arms connected in series at a connection point forming an AC phase voltage output terminal which is connected to a load, each valve arm having a plurality of power inverter cells with turn-off semiconductor switches and a choke connected in series, includes controlling, with a control device, the turn-off semiconductor switches of each power inverter cell as a function of a plurality of setpoint values, wherein the setpoint values are generated such that a time-averaged energy value stored in a capacitor of a corresponding power inverter cells is predetermined by an operating point of the load and-or an operating mode of the modular multi-level power inverter.
    Type: Grant
    Filed: January 22, 2013
    Date of Patent: April 11, 2017
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Steffen Bernet, Hans Bärnklau, Albrecht Gensior, Steffen Rohner
  • Patent number: 9608545
    Abstract: Circuits and methods for driving a load are disclosed. An exemplary driving circuit may include a plurality of switching devices and a controller electrically connected to the plurality of switching devices. The controller may be configured to provide a switching signal for controlling switching operations of the switching devices. The controller may also be configured to determine whether the switching signal falls within a predetermined dead zone. When it is determined that the switching signal falls within the predetermined dead zone, the controller may be configured to modify the switching signal by moving a space vector corresponding to the switching signal to a boundary of the predetermined dead zone. In addition, the controller may be configured to provide the modified switching signal to the switching devices.
    Type: Grant
    Filed: March 2, 2016
    Date of Patent: March 28, 2017
    Assignee: FARADAY & FUTURE INC.
    Inventors: Jung Sik Yim, Silva Hiti, Steven E. Schulz
  • Patent number: 9608540
    Abstract: The invention relates to a method (60) for controlling an inverter (10) using space-vector pulse width modulation, in particular to control an electric machine (14), said inverter (10) being equipped with a plurality of controllable switches (S) and being designed to provide a polyphase electric current (IU, IV, IW), in particular to supply multiphase electric current to an electric machine (14). In said method, a reference phase angle (alpha_R) is predefined, and the inverter (10) is controlled in such a way that a plurality of different successive switching states (V0-V7) is established for the switches (S) in order to provide the electric current (IU, IV, IW) in the form of a current space vector (I*).
    Type: Grant
    Filed: April 23, 2013
    Date of Patent: March 28, 2017
    Assignee: Robert Bosch GmbH
    Inventors: Michele Hirsch, Ulrich Schuster, Tino Merkel, Andrea Deflorio
  • Patent number: 9577567
    Abstract: An electric motor in a work apparatus has a power characteristic line which runs between a lower rotational speed of the electric motor and an upper rotational speed of the electric motor. The power characteristic line has a power characteristic with a pronounced maximum (M) and an operating plateau (AP) which lies in a working rotational speed range (AD) of the work apparatus. A method for operating the electric motor provides for configuring the position of the operating plateau (AP) to be variable with respect to the rotational speed of the electric motor to achieve stable operating points over a wide rotational speed range.
    Type: Grant
    Filed: February 4, 2013
    Date of Patent: February 21, 2017
    Assignee: Andreas Stihl AG & Co. KG
    Inventors: Jochen Oerding, Rene Wichert, Christian Renz, Gernot Liebhard
  • Patent number: 9571024
    Abstract: A multiphase motor generator system includes a multiphase induction motor having a plurality of separate terminals, a multiphase inverter coupled to a DC link voltage source and the plurality of terminals of the multiphase induction motor, a plurality of current detectors configured to detect a plurality of currents that flow between the multiphase inverter and the plurality of terminals of the multiphase induction motor, and a controller coupled to the current detectors and the multiphase inverter, and configured to receive the detected currents and output a plurality of control voltages to the multiphase inverter. The controller includes a multiphase to direct-quadrature (dq) conversion unit, a dq equivalent unit, a dq to multiphase conversion unit, and a pulse-width-modulator (PWM) converter.
    Type: Grant
    Filed: January 5, 2016
    Date of Patent: February 14, 2017
    Assignee: Caterpillar Inc.
    Inventors: Chen Yuan, Krishnakumar Dharapuram Ramamoorthy, Osama Mohammad Alkhouli
  • Patent number: 9553500
    Abstract: Provided is a maximum power point (MPP) tracker for a PV cell inverter, and a PV cell inverter. The MPP tracker decouples output power oscillations from the input power generation and extracts maximum available power from the PV cell. The PV cell inverter uses the MPP tracker and generates a sinusoidal output current from the MPP tracker output. The sinusoidal output current may be fed to a power distribution grid. The PV cell inverter may use a pulse width modulation technique to cancel harmonics in the sinusoidal output current. The circuits use a minimum number of components and avoid use of large electrolytic capacitors.
    Type: Grant
    Filed: February 5, 2014
    Date of Patent: January 24, 2017
    Assignee: SPARQ Systems Inc.
    Inventors: Ali Khajehoddin, Praveen K. Jain, Alireza Bakhshai
  • Patent number: 9551515
    Abstract: There is provided a refrigeration cycle apparatus in which an outdoor heat source unit, an indoor unit, and a water heating unit are connected, and an air conditioning operation and a water heating operation can be performed separately, and an exhaust-heat recovery operation can be performed by simultaneously performing air cooling and water heating. The outdoor heat source unit includes a compressor for compressing refrigerant, a refrigerant air-heat exchanger that performs heat exchange between the refrigerant and outside air, a fan for cooling the refrigerant air-heat exchanger, a control device that includes an inverter device for driving the compressor, and a heat sink for dissipating heat of the inverter device, and a switching element in the inverter device is constituted by an element formed by a wide bandgap semiconductor.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: January 24, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventor: Katsuyuki Amano
  • Patent number: 9548687
    Abstract: A method of estimating a rotational position of a motor having saliency, the method including the steps of a) superimposing, on a drive voltage for the motor, a measuring voltage having a predetermined frequency higher than a frequency of the drive voltage to generate three-phase voltages, and supplying the three-phase voltages to a stationary portion of the motor; b) in parallel with step a), extracting components of the predetermined frequency in three-phase currents flowing in the stationary portion as first, second, and third extracted currents; c) multiplying the first and second extracted currents together to acquire a first composite signal, multiplying the second and third extracted currents together to acquire a second composite signal, and multiplying the first and third extracted currents together to acquire a third composite signal; d) subjecting the first, second, and third composite signals to low-pass filtering to acquire first, second, and third filtered signals, respectively, the low-pass fil
    Type: Grant
    Filed: February 4, 2016
    Date of Patent: January 17, 2017
    Assignees: NIDEC SINGAPORE PTE., LTD., NIDEC CORPORATION
    Inventor: Ju Feng
  • Patent number: 9537437
    Abstract: The present subject matter is directed to systems and methods for controlling variable speed generators, particularly converters associated with doubly-fed induction generators (DFIG) to permit use of harmonic attenuating filters that are generally smaller and less costly than previous similar filters. The subject matter provides for controlling line-side and rotor-side converters in such a manner that the frequencies generated by the converters are interleaved in a manner that the filters see a higher switching frequency and thus may be designed based on those higher frequencies, thereby requiring smaller and less expensive components.
    Type: Grant
    Filed: March 4, 2013
    Date of Patent: January 3, 2017
    Assignee: General Electric Company
    Inventors: Robert Gregory Wagoner, David Smith
  • Patent number: 9531307
    Abstract: A method of controlling a motor includes a) acquiring a rotational speed parameter; b) selecting either a three-phase modulation scheme and a two-phase modulation scheme based on a result of comparing a rotational speed of the motor with a predetermined reference speed; c) calculating phase voltage command values based on a target rotational speed and the rotational speed parameter; d) generating switching signals by using the selected modulation scheme based on the phase voltage command values; and e) outputting the switching signals to an inverter. In step b), the two-phase modulation scheme is selected when the rotational speed of the motor is higher than the reference speed to reduce switching loss is reduced and improve power efficiency without deteriorating starting characteristics and motor drive characteristics when the rotational speed is low.
    Type: Grant
    Filed: March 25, 2015
    Date of Patent: December 27, 2016
    Assignee: NIDEC CORPORATION
    Inventor: Rafael Herrejon Mendoza
  • Patent number: 9502998
    Abstract: Systems and methods are disclosed for controlling a torque output by an AC motor drawing power from a DC bus. According to certain embodiments, the system for controlling the torque output has a controller and an inverter. The controller further has an operation status detector, a basic voltage vector calculator, and a voltage command generator. The operation status detector is configured to determine a DC bus voltage and a rotor field vector. The basic voltage vector calculator is configured to calculate a plurality of basic voltage vectors having a magnitude proportional to the DC bus voltage. The voltage command generator is configured to generate a voltage command for producing a stator field vector. Producing the stator field vector includes at least one of maintaining a constant angle between the stator field vector and the rotor field vector, and setting a magnitude of the stator field vector equal to the magnitude of the plurality of basic voltage vectors.
    Type: Grant
    Filed: May 18, 2015
    Date of Patent: November 22, 2016
    Assignee: Caterpillar Inc.
    Inventor: Baojun Si
  • Patent number: 9455653
    Abstract: Phase currents of an inverter-driven electric machine are measured by mounting phase conductors of each respective phase current into a central passage of a respective flux core. A plurality of current sensors are mounted into a gap of each respective flux core to generate a respective plurality of current signals for each phase current. The Hall-effect devices are connected to a plurality of multi-channel op amp devices for conditioning the current signals such that each set of Hall-effect devices is connected to a different one of the op amp devices and such that each op amp device receives one current signal corresponding to each phase current. Thus, a valid conditioned current signal corresponding to each phase conductor is generated by the op amp devices unless there are multiple simultaneous failures of the Hall-effect devices and the op amp devices.
    Type: Grant
    Filed: March 5, 2015
    Date of Patent: September 27, 2016
    Assignee: FORD GLOBAL TECHNOLOGIES, LLC
    Inventor: Jaswant S. Garcha
  • Patent number: 9455646
    Abstract: A filter device comprises: a filter capacitor portion having one set of ends connected to the AC voltage unit, and the other set of ends connected to DC terminals of the semiconductor switching unit via a low impedance element, wherein both set of ends of the filter capacitor portion and the DC terminals of the semiconductor switching unit are static ground terminals of the power converter; a filter inductance portion a first set of connection terminals connected to the AC voltage unit, a second set of connection terminals connected to the AC terminals of the semiconductor switching unit, a third set of connection terminals connected to one of the static ground terminals of the power converter, and a fourth set of connection terminals; and a compensation portion having one end connected to the fourth set of connection terminals and the other end connected to the ground.
    Type: Grant
    Filed: July 2, 2013
    Date of Patent: September 27, 2016
    Inventors: Jinping Zhou, Min Zhou, Yicong Xie
  • Patent number: 9444369
    Abstract: A power conversion apparatus includes: an inverter unit having high and low potential-side switching elements corresponding to each phase of a winding of a rotating electrical machine; a current detecting unit; a current obtaining unit obtaining a current detection value with a fixed interval sampling timing; and a control unit controlling the switching elements based on a PWM reference signal and a duty instruction value. The control unit includes: a phase current computing device; a voltage instruction value computing device; and a duty computing device. The phase current computing device computes a correction current based on positive and negative side corrected current detection values. The positive-side corrected current detection value is obtained when a duty is adjusted to a positive side, and the negative-side corrected current detection value is obtained when the duty is adjusted to a negative side.
    Type: Grant
    Filed: September 17, 2014
    Date of Patent: September 13, 2016
    Assignee: DENSO CORPORATION
    Inventor: Takashi Suzuki
  • Patent number: 9444368
    Abstract: A method performed in a power bridge (3) comprising multiple arms (B1, B2, Bi, Bn). Each arm comprises upper and lower semiconductor switches arranged in series and connected in parallel to first and second terminals (B+, B?) of a common voltage source (2). The mid-point of the arm is connected to a phase of an electrical load (1). The aforementioned switches are controlled complementarily by pulses having a duty factor set value (RC1, RC2, RCi, RCn) determined as a function of a first phase voltage set value (V1, V2, Vi, Vn) in relation to a reference terminal of the electrical load (1) and of a common-mode voltage (V0) in relation to one of the first or second terminals, such as to control the switching losses of the switches. The common-mode voltage (V0) is determined such as to balance switching losses and conduction losses between the switches.
    Type: Grant
    Filed: March 4, 2013
    Date of Patent: September 13, 2016
    Assignee: Valeo Equipements Electriques Moteur
    Inventor: Michaël Chemin
  • Patent number: 9435263
    Abstract: A thermal stress reduction method includes ramping an electric power generator to start an aircraft engine, for a time period associated with the aircraft engine start sequence toggling a three-level inverter switch array to a three-level pulse width modulation mode, determining if a first time interval in the three-level pulse width modulation mode exceeded a predetermined three-level pulse width modulation mode interval, in response to the first time interval exceeding the three-level pulse width modulation mode interval, toggling the three-level inverter switch array to a two-level pulse width modulation mode, determining if a second time interval in the two-level pulse width modulation mode exceeded a predetermined two-level pulse width modulation mode interval and in response to the second time interval exceeding the two-level pulse width modulation mode interval, toggling the three-level inverter switch array to the three-level pulse width modulation mode.
    Type: Grant
    Filed: May 20, 2014
    Date of Patent: September 6, 2016
    Assignee: HAMILTON SUNDSTRAND CORPORATION
    Inventors: Huazhen Chai, Adam M. White, Mustansir Kheraluwala
  • Patent number: 9425706
    Abstract: A three phase inverter consisting of three single phase legs using either switch mode or linear control is fed by a DC-DC converter to provide input output isolation. This requires that the DC-DC converter delivers equal positive and negative voltages to the single phase legs to allow each output to generate a high fidelity sine wave outputs to the load. By measuring the error voltages on the positive output, the negative output and the total output of the DC-DC converter it is possible to control a single duty cycle while maintaining all three output voltages within the limits required by the DC-AC phase legs. This significantly reduces the cost and complexity of the DC-DC converter and eliminates the need to use a fourth phase leg to generate the neutral connection for a three phase output.
    Type: Grant
    Filed: June 26, 2014
    Date of Patent: August 23, 2016
    Assignee: GE Aviation Systems, LLC
    Inventors: Philip Henry Richard Epps, Andrew Benjamin Cole
  • Patent number: 9419556
    Abstract: A method and arrangement for operating a pump system are disclosed, the pump system including a pump arranged to be rotated with an AC motor, an inverter, the output of which is electrically connected to the AC motor, and a photovoltaic panel system electrically connected to feed DC power to the inverter. The method can include setting a voltage limit, and determining continuously voltage obtained from the photovoltaic panel system. When the determined voltage of the photovoltaic panel system is below the set voltage limit, frequency of the inverter can be controlled such that the ratio between output voltage of the inverter and the output frequency is substantially constant. When the determined voltage of the photovoltaic panel system exceeds the voltage limit, the inverter frequency can be controlled for keeping voltage of the photovoltaic panel system substantially at the voltage limit.
    Type: Grant
    Filed: September 26, 2014
    Date of Patent: August 16, 2016
    Assignee: ABB Technology Oy
    Inventors: Laxmikantha Shenoy, Ahmed Syed, Chetan Patange, Deepak Pandey, Mikko Lammi, Rahul Raj, Satyan Rn
  • Patent number: 9401674
    Abstract: A motor controller for providing a three-phase alternating current (AC) signal to a three-phase motor. The motor controller uses current feedback from a single shunt to monitor or control the three phase AC signal. The motor controller may include a three-phase DC to AC power inverter, a single-shunt current sensor, and a processor. During individual duty cycles when two or more phase signals are too close to each other, the processor may shift one of the phase signals in time so that its leading or trailing edges are a predetermined conflict time away from each other. Then, the processor may sample current from the single-shunt current sensor to determine currents of two of the three phase signals and then calculate current of a remaining one of the three phase signals. Sample times may depend on pulse widths and shifting of the phase signals.
    Type: Grant
    Filed: June 11, 2014
    Date of Patent: July 26, 2016
    Assignee: Nidec Motor Corporation
    Inventors: Christopher D. Schock, Prakash B. Shahi