Patents by Inventor Yasukazu Murata

Yasukazu Murata has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20200244201
    Abstract: To provide a controller for an AC rotary machine capable of performing on/off control of the switching device of the set which does not fail, by considering the state of the AC rotary machine related to the windings of the failed set. A controller for an AC rotary machine, about a set in which the switching device failed, stops dq-axis current control, and turns on, in the case of the short circuit failure, and turns off, in the case of the open circuit failure, at least the respective phase switching devices of the positive electrode side or the negative electrode side which is the same side as the failed switching device; and about a set which does not fail, continues dq-axis current control and changes the current component of the d-axis according to the state of the AC rotary machine related to the windings of the failed set.
    Type: Application
    Filed: December 7, 2015
    Publication date: July 30, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yoshimasa NISHIJIMA, Keiichi ENOKI, Masutaka WATANABE, Yasukazu MURATA, Shingo HARADA
  • Publication number: 20200144948
    Abstract: In order to reduce deviation of correction amount when calculating a magnetic pole position correction amount of a permanent magnet type rotating electrical machine, and perform magnetic pole position correction with high accuracy, in state where the permanent magnet type rotating electrical machine is rotated, a d-axis current command value and a q-axis current command value in dg vector control are kept substantially zero, an actual d-axis voltage and an actual q-axis voltage are calculated from a midpoint potential detected from a midpoint potential detection unit, a magnetic pole position correction amount is calculated based on a predetermined arithmetic expression from the actual d-axis voltage and the actual q-axis voltage, and magnetic pole position origin correction is performed based on the magnetic pole position correction amount.
    Type: Application
    Filed: June 6, 2017
    Publication date: May 7, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yoshimasa NISHIJIMA, Keiichi ENOKI, Masutaka WATANABE, Yasukazu MURATA, Shingo HARADA, Kazuhiko OTSUKA
  • Patent number: 10608569
    Abstract: A control device of an AC rotating electrical machine includes: a midpoint potential detection unit 12 that detects, for respective phases, midpoint potentials 43, 44, 45 of upper switching elements 41 and lower switching elements 42 of an inverter circuit 20; a phase current detection unit 23 that detects a phase current of each phase of an AC rotating electrical machine 3; and a CPU 11 that calculates a current estimated value Idc of DC current that is input from a DC power supply 2 to the inverter circuit 20, on the basis of the detected midpoint potential of each phase and the phase current of each phase.
    Type: Grant
    Filed: August 29, 2017
    Date of Patent: March 31, 2020
    Assignee: Mitsubishi Electric Corporation
    Inventors: Daisuke Matsumuro, Keiichi Enoki, Yoshimasa Nishijima, Masutaka Watanabe, Shingo Harada, Yasukazu Murata
  • Patent number: 10469015
    Abstract: A motor control device having a motor temperature sensor for detecting a magnet temperature of the motor, a magnet magnetic flux calculation section that calculates a magnet magnetic flux of the motor corresponding to the magnet temperature of the motor, a current combination candidate calculating section that calculates a d-q axis current combination candidate that minimizes the input current of the inverter within a voltage limit ellipse determined by a value that can be output by a voltage of a power supply of the motor, and a d-q axis current search section that searches the d-q axis current that minimizes the input current of the inverter within the range of the combination candidate of the d-q axis currents when the d-q axis current of the motor moves on a voltage limiting ellipse by automatic weakening flux control.
    Type: Grant
    Filed: June 22, 2015
    Date of Patent: November 5, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shingo Harada, Keiichi Enoki, Yasukazu Murata, Masutaka Watanabe, Yoshimasa Nishijima
  • Patent number: 10404200
    Abstract: An AC-rotating-electric-machine control apparatus includes two or more electric-power conversion circuits that control respective voltages to be applied to the two or more groups of multi-phase armature windings, for each of the two or more groups of multi-phase armature windings; each of the two or more electric-power conversion circuits has two or more switching devices for opening or closing the corresponding group of multi-phase armature windings, for each of the phases; the two or more switching devices are switching-controlled in such a way that opening operation or duty control can be applied to the corresponding group of multi-phase armature windings.
    Type: Grant
    Filed: May 11, 2015
    Date of Patent: September 3, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Masutaka Watanabe, Keiichi Enoki, Yasukazu Murata, Yoshimasa Nishijima, Shingo Harada
  • Patent number: 10164446
    Abstract: The discharge circuit malfunction diagnosis device configured to diagnose a malfunction of a discharge circuit, which is to be applied to a power supply system including: an assembled battery including a plurality of cells; a discharge circuit which is configured to discharge the each of the plurality of cells when driven; and a voltage adjustment section configured to determine, based on voltages of the respective plurality of cells of the assembled battery, a target cell voltage and a cell to be discharged, and configured to drive a discharge circuit for the cell to be discharged in accordance with the target cell voltage, includes a malfunction diagnosis section configured to compare a discharge circuit pre-driving voltage and a discharge circuit post-driving voltage of the cell to be discharged, to thereby diagnose a malfunction of a discharge circuit corresponding to the cell to be discharged.
    Type: Grant
    Filed: October 29, 2013
    Date of Patent: December 25, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yasukazu Murata, Masami Nakashima, Shingo Yamaguchi
  • Publication number: 20180278191
    Abstract: A control device of an AC rotating electrical machine includes: a midpoint potential detection unit 12 that detects, for respective phases, midpoint potentials 43, 44, 45 of upper switching elements 41 and lower switching elements 42 of an inverter circuit 20; a phase current detection unit 23 that detects a phase current of each phase of an AC rotating electrical machine 3; and a CPU 11 that calculates a current estimated value Idc of DC current that is input from a DC power supply 2 to the inverter circuit 20, on the basis of the detected midpoint potential of each phase and the phase current of each phase.
    Type: Application
    Filed: August 29, 2017
    Publication date: September 27, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Daisuke MATSUMURO, Keiichi ENOKI, Yoshimasa NISHIJIMA, Masutaka WATANABE, Shingo HARADA, Yasukazu MURATA
  • Patent number: 10050569
    Abstract: An inverter control device that controls a multiple of inverters configured to use the same positive and negative direct current voltage bus lines connected to a power supply and driving a corresponding multiple of motors, the inverter control device including smoothing control means that controls an inverter outflow current so that voltage of the power supply is smoothed by a smoothing capacitor connected to the positive and negative direct current voltage bus lines, and two-phase modulation operation means that fixes a predetermined one phase of a three-phase modulated wave at either a maximum voltage or minimum voltage the inverter can output determined by a voltage between the positive and negative direct current voltage bus lines, and calculates a modulated wave that causes the other two phases to switch.
    Type: Grant
    Filed: February 14, 2017
    Date of Patent: August 14, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shingo Harada, Keiichi Enoki, Yasukazu Murata, Masutaka Watanabe, Yoshimasa Nishijima
  • Patent number: 10027265
    Abstract: An inverter control device and inverter control method are such that, when there is a possibility of induction voltage caused by a multi-phase motor exceeding a breakdown voltage of a switching element of an inverter, two of three phases are first interrupted at an appropriate timing in order to restrict induction voltage when shifting from a three-phase short circuit to an all-phase interruption, after which a shift is made to an all-phase interruption at a timing at which currents of the three phases reach the vicinity of zero, whereby a leap in a direct current bus voltage is restricted.
    Type: Grant
    Filed: June 29, 2017
    Date of Patent: July 17, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shingo Harada, Keiichi Enoki, Masutaka Watanabe, Yoshimasa Nishijima, Yasukazu Murata, Michitaka Fujiwara
  • Publication number: 20180154887
    Abstract: A temperature detection condition of a temperature detection unit used in a motor system is determined by: obtaining a phase current value flowing through a motor device and obtaining a temperature detection value; calculating, as an integrated phase current value, at least one of a first integrated phase current value, which is obtained by integrating an amount by which the phase current value exceeds a first phase current threshold, and a second integrated phase current value, which is obtained by integrating an amount by which the phase current value is smaller than a second phase current threshold that is equal to or smaller than the first phase current threshold; and determining an amount of variation in the temperature detection value detected by the temperature detection unit following the start of determination of the temperature detection condition and an amount of variation in the calculated integrated phase current value.
    Type: Application
    Filed: November 13, 2017
    Publication date: June 7, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yasukazu MURATA, Keiichi ENOKI, Masutaka WATANABE, Yoshimasa NISHIJIMA, Shingo HARADA
  • Publication number: 20180138844
    Abstract: An inverter control device and inverter control method are such that, when there is a possibility of induction voltage caused by a multi-phase motor exceeding a breakdown voltage of a switching element of an inverter, two of three phases are first interrupted at an appropriate timing in order to restrict induction voltage when shifting from a three-phase short circuit to an all-phase interruption, after which a shift is made to an all-phase interruption at a timing at which currents of the three phases reach the vicinity of zero, whereby a leap in a direct current bus voltage is restricted.
    Type: Application
    Filed: June 29, 2017
    Publication date: May 17, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Shingo HARADA, Keiichi ENOKI, Masutaka WATANABE, Yoshimasa NISHIJIMA, Yasukazu MURATA, Michitaka FUJIWARA
  • Publication number: 20180123493
    Abstract: A motor control device having a motor temperature sensor for detecting a magnet temperature of the motor, a magnet magnetic flux calculation section that calculates a magnet magnetic flux of the motor corresponding to the magnet temperature of the motor, a current combination candidate calculating section that calculates a d-q axis current combination candidate that minimizes the input current of the inverter within a voltage limit ellipse determined by a value that can be output by a voltage of a power supply of the motor, and a d-q axis current search section that searches the d-q axis current that minimizes the input current of the inverter within the range of the combination candidate of the d-q axis currents when the d-q axis current of the motor moves on a voltage limiting ellipse by automatic weakening flux control.
    Type: Application
    Filed: June 22, 2015
    Publication date: May 3, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Shingo HARADA, Keiichi ENOKI, Yasukazu MURATA, Masutaka WATANABE, Yoshimasa NISHIJIMA
  • Patent number: 9950630
    Abstract: While a current cutoff mechanism cuts off charging and discharging currents for a second electric storage device, a DC/DC converter is controlled so as to be in a state where electric power is supplied from a low-voltage side to a high-voltage side, applies voltage conversion to an input voltage of the low-voltage side so that an output voltage of the high-voltage side becomes a predetermined voltage, and after a predetermined state where the induction voltage of the AC power generator can be supplied to the low-voltage side is reached, control of the DC/DC converter is switched from the state where electric power is supplied from the low-voltage side to the high-voltage side to a state where electric power is supplied from the high-voltage side to the low-voltage side.
    Type: Grant
    Filed: May 22, 2013
    Date of Patent: April 24, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Toshiaki Date, Yasukazu Murata, Satoshi Wachi, Shingo Yamaguchi, Nozomu Kamioka
  • Publication number: 20180006593
    Abstract: An AC-rotating-electric-machine control apparatus includes two or more electric-power conversion circuits that control respective voltages to be applied to the two or more groups of multi-phase armature windings, for each of the two or more groups of multi-phase armature windings; each of the two or more electric-power conversion circuits has two or more switching devices for opening or closing the corresponding group of multi-phase armature windings, for each of the phases; the two or more switching devices are switching-controlled in such a way that opening operation or duty control can be applied to the corresponding group of multi-phase armature windings.
    Type: Application
    Filed: May 11, 2015
    Publication date: January 4, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Masutaka WATANABE, Keiichi ENOKI, Yasukazu MURATA, Yoshimasa NISHIJIMA, Shingo HARADA
  • Publication number: 20170279383
    Abstract: An inverter control device that controls a multiple of inverters configured to use the same positive and negative direct current voltage bus lines connected to a power supply and driving a corresponding multiple of motors, the inverter control device including smoothing control means that controls an inverter outflow current so that voltage of the power supply is smoothed by a smoothing capacitor connected to the positive and negative direct current voltage bus lines, and two-phase modulation operation means that fixes a predetermined one phase of a three-phase modulated wave at either a maximum voltage or minimum voltage the inverter can output determined by a voltage between the positive and negative direct current voltage bus lines, and calculates a modulated wave that causes the other two phases to switch.
    Type: Application
    Filed: February 14, 2017
    Publication date: September 28, 2017
    Applicant: Mitsubishi Electric Corporation
    Inventors: Shingo HARADA, Keiichi ENOKI, Yasukazu MURATA, Masutaka WATANABE, Yoshimasa NISHIJIMA
  • Publication number: 20170264229
    Abstract: MCU (2001) determines whether at least one of double three-phase inverter (2030) or battery (2002) has a failure, or battery (2002) is fully charged, and switches control to be performed in inverter (2030) between all-phase shut off and three-phase short circuit based on a motor rotation speed of double three-phase motor (2050) when MCU (2001) determines that any one of inverter (2030) and battery (2002) has a failure, or battery (2002) is fully charged. Battery (2002) and inverter (2030) can be protected when current is inhibited from flowing from motor (2050) to battery (2002) due to a failure of inverter (2030) or battery (2002).
    Type: Application
    Filed: August 29, 2016
    Publication date: September 14, 2017
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yasukazu MURATA, Keiichi ENOKI, Masutaka WATANABE, Shingo HARADA, Yoshimasa NISHIJIMA
  • Publication number: 20160226273
    Abstract: The discharge circuit malfunction diagnosis device configured to diagnose a malfunction of a discharge circuit, which is to be applied to a power supply system including: an assembled battery including a plurality of cells; a discharge circuit which is configured to discharge the each of the plurality of cells when driven; and a voltage adjustment section configured to determine, based on voltages of the respective plurality of cells of the assembled battery, a target cell voltage and a cell to be discharged, and configured to drive a discharge circuit for the cell to be discharged in accordance with the target cell voltage, includes a malfunction diagnosis section configured to compare a discharge circuit pre-driving voltage and a discharge circuit post-driving voltage of the cell to be discharged, to thereby diagnose a malfunction of a discharge circuit corresponding to the cell to be discharged.
    Type: Application
    Filed: October 29, 2013
    Publication date: August 4, 2016
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yasukazu MURATA, Masami NAKASHIMA, Shingo YAMAGUCHI
  • Patent number: 9283855
    Abstract: The power management apparatus provided in a vehicle includes: a switch 6 for bringing a state between the first and second electric power storage devices 1 and 2 into a non-conduction state during a normal operation and switching the state therebetween to a conduction state when a failure of the power converter 4 is detected; and a power management section 7 for controlling the motor-generator 3 so that a difference between voltages of the first and second electric power storage devices 1 and 2 is equal to or smaller than a predetermined voltage difference before the switch 6 is operated to perform switching from the non-conduction state to the conduction state.
    Type: Grant
    Filed: May 24, 2012
    Date of Patent: March 15, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Nozomu Kamioka, Satoshi Wachi, Yasukazu Murata
  • Publication number: 20150352968
    Abstract: While a current cutoff mechanism cuts off charging and discharging currents for a second electric storage device, a DC/DC converter is controlled so as to be in a state where electric power is supplied from a low-voltage side to a high-voltage side, applies voltage conversion to an input voltage of the low-voltage side so that an output voltage of the high-voltage side becomes a predetermined voltage, and after a predetermined state where the induction voltage of the AC power generator can be supplied to the low-voltage side is reached, control of the DC/DC converter is switched from the state where electric power is supplied from the low-voltage side to the high-voltage side to a state where electric power is supplied from the high-voltage side to the low-voltage side.
    Type: Application
    Filed: May 22, 2013
    Publication date: December 10, 2015
    Applicant: Mitsubishi Electric Corporation
    Inventors: Toshiaki DATE, Yasukazu MURATA, Satoshi WACHI, Shingo YAMAGUCHI, Nozomu KAMIOKA
  • Publication number: 20130119759
    Abstract: The power management apparatus provided in a vehicle includes: a switch 6 for bringing a state between the first and second electric power storage devices 1 and 2 into a non-conduction state during a normal operation and switching the state therebetween to a conduction state when a failure of the power converter 4 is detected; and a power management section 7 for controlling the motor-generator 3 so that a difference between voltages of the first and second electric power storage devices 1 and 2 is equal to or smaller than a predetermined voltage difference before the switch 6 is operated to perform switching from the non-conduction state to the conduction state.
    Type: Application
    Filed: May 24, 2012
    Publication date: May 16, 2013
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Nozomu KAMIOKA, Satoshi WACHI, Yasukazu MURATA