Patents by Inventor Kozo Ide

Kozo Ide 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).

  • Patent number: 9985545
    Abstract: A DC-to-DC converter includes a first switching circuit, a second switching circuit, a transformer positioned between an AC side of the first switching circuit and an AC side of the second switching circuit, an inductance element positioned between the transformer and at least one of the AC side of the first switching circuit and the AC side of the second switching circuit, and control circuitry that operates the first switching circuit and the second switching circuit. The control circuitry sets a predetermined operation ratio of the first switching circuit and the second switching circuit to each other, and adjusts, based on the predetermined operation ratio, a first operation period of the first switching circuit and a second operation period of the second switching circuit.
    Type: Grant
    Filed: July 14, 2017
    Date of Patent: May 29, 2018
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Seiji Fujisaki, Sadao Ishii, Kozo Ide
  • Publication number: 20170310229
    Abstract: A DC-to-DC converter includes a first switching circuit, a second switching circuit, a transformer positioned between an AC side of the first switching circuit and an AC side of the second switching circuit, an inductance element positioned between the transformer and at least one of the AC side of the first switching circuit and the AC side of the second switching circuit, and control circuitry that operates the first switching circuit and the second switching circuit. The control circuitry sets a predetermined operation ratio of the first switching circuit and the second switching circuit to each other, and adjusts, based on the predetermined operation ratio, a first operation period of the first switching circuit and a second operation period of the second switching circuit.
    Type: Application
    Filed: July 14, 2017
    Publication date: October 26, 2017
    Applicant: Kabushiki Kaisha Yaskawa Denki
    Inventors: Seiji FUJISAKI, Sadao ISHll, Kozo IDE
  • Patent number: 9509233
    Abstract: A power converter according to embodiments includes a boost circuit, a single-phase inverter, a current controller, and a power conversion controller. The current controller generates a voltage reference based on a difference between current output from the single-phase inverter and a current reference. The power conversion controller controls the single-phase inverter to generate a first portion of the AC voltage, and controls the boost circuit to generate a second portion of the AC voltage. The first portion corresponds to the voltage reference of which an absolute value is smaller than the voltage of the DC power supply. The second portion corresponds to the voltage reference of which an absolute value is greater than the voltage of the DC power supply.
    Type: Grant
    Filed: March 20, 2015
    Date of Patent: November 29, 2016
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Kozo Ide, Tetsumi Narita, Seiji Fujisaki, Mamoru Takaki, Shinya Morimoto
  • Patent number: 9195223
    Abstract: A motor controller includes a position speed estimation section and a control section. The position speed estimation section outputs a motor estimated position and a motor estimated speed based on a position estimated error, which is a difference between a motor position of a motor and the motor estimated position. An observer modifier outputs an observer modification value based on the position estimated error. A nonlinear compensator outputs a compensation torque based on the position estimated error. An operator outputs an operation value based on the observer modification value and the compensation torque. A motor model outputs the motor estimated position and the motor estimated speed based on the operation value. The control section outputs a torque command based on the motor estimated position, the motor estimated speed, and a position command to control the motor.
    Type: Grant
    Filed: June 10, 2014
    Date of Patent: November 24, 2015
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Noor Aamir Baloch, Kozo Ide, Shinya Morimoto
  • Patent number: 9190935
    Abstract: A power regenerative converter includes: a power conversion unit configured to convert AC power supplied from an AC power supply into DC power and convert DC power into AC power to be supplied as regenerative electric power to the AC power supply; an LCL filter including a reactor unit having a plurality of reactors connected in series between the power conversion unit and the AC power supply, and capacitors each having one end connected to a series connection point of the reactors in the reactor unit; a drive control unit for controlling the power conversion unit based on an AC voltage command; and a voltage command compensation unit for calculating a compensation value in accordance with a capacitor voltage being a voltage at the series connection point of the reactors and adding the compensation value to the AC voltage command input to the drive control unit.
    Type: Grant
    Filed: April 10, 2013
    Date of Patent: November 17, 2015
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Yoshiyasu Takase, Kozo Ide, Shinya Morimoto, Hideaki Iura, Takahiro Saeki
  • Publication number: 20150280612
    Abstract: A power converter according to embodiments includes a boost circuit, a single-phase inverter, a current controller, and a power conversion controller. The current controller generates a voltage reference based on a difference between current output from the single-phase inverter and a current reference. The power conversion controller controls the single-phase inverter to generate a first portion of the AC voltage, and controls the boost circuit to generate a second portion of the AC voltage. The first portion corresponds to the voltage reference of which an absolute value is smaller than the voltage of the DC power supply. The second portion corresponds to the voltage reference of which an absolute value is greater than the voltage of the DC power supply.
    Type: Application
    Filed: March 20, 2015
    Publication date: October 1, 2015
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Kozo IDE, Tetsumi NARITA, Seiji FUJISAKI, Mamoru TAKAKI, Shinya MORIMOTO
  • Patent number: 9041325
    Abstract: A control device for an alternating current motor according to embodiments includes a current distributor and a phase estimator. The current distributor divides a torque command by using a control phase and outputs a component that contributes to a mechanical output of the motor as a ?-axis current command and a component that does not contribute to the mechanical output as a ?-axis current command. The phase estimator computes a phase at which a ?-axis component of an addition amount of the output of the current controller and a voltage drop amount of inductance of the motor becomes zero and outputs the computed phase as the control phase.
    Type: Grant
    Filed: February 29, 2012
    Date of Patent: May 26, 2015
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Akira Yamazaki, Kozo Ide
  • Publication number: 20150115862
    Abstract: A motor control apparatus includes a position and speed estimator configured to output a new estimated motor position and an estimated motor speed based on a position estimation deviation that is a difference between an acquired motor position and an estimated motor position of a motor, and a controller configured to output a motor power command, which controls the motor, based on the estimated motor position, the estimated motor speed, and a position command. The position and speed estimator includes a motor model of the motor configured to output the estimated motor position and the estimated motor speed based on a predetermined calculation value, and a nonlinear compensator configured to output a compensation motor power based on the position estimation deviation to compensate an error of the motor model.
    Type: Application
    Filed: January 8, 2015
    Publication date: April 30, 2015
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Noor Aamir BALOCH, Kozo IDE, Shinya MORIMOTO
  • Publication number: 20140292248
    Abstract: A motor controller includes a position speed estimation section and a control section. The position speed estimation section outputs a motor estimated position and a motor estimated speed based on a position estimated error, which is a difference between a motor position of a motor and the motor estimated position. An observer modifier outputs an observer modification value based on the position estimated error. A nonlinear compensator outputs a compensation torque based on the position estimated error. An operator outputs an operation value based on the observer modification value and the compensation torque. A motor model outputs the motor estimated position and the motor estimated speed based on the operation value. The control section outputs a torque command based on the motor estimated position, the motor estimated speed, and a position command to control the motor.
    Type: Application
    Filed: June 10, 2014
    Publication date: October 2, 2014
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Noor Aamir BALOCH, Kozo IDE, Shinya MORIMOTO
  • Publication number: 20140246940
    Abstract: A motor includes a rotor including a rotor core provided with a plurality of permanent magnets in the circumferential direction and a stator including a stator core on which multi-phase stator coils are wound. The rotor has a structure in which the change pattern of magnetic properties of the rotor core or the permanent magnets changes in the circumferential direction, and the stator has a structure in which first and second stator coils of the stator coils are wound on the stator core for each phase in such a manner that passage of current is optionally switched, and when the passage of current is switched to the second stator coil, the distribution pattern of a magnetic field formed on the inner circumferential side by the stator has uniqueness over the whole circumference.
    Type: Application
    Filed: May 12, 2014
    Publication date: September 4, 2014
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Sohji MURAKAMI, Motomichi OHTO, Kentaro INOMATA, Shinya MORIMOTO, Kozo IDE
  • Publication number: 20140246939
    Abstract: The motor includes: a rotor that includes a rotor core provided with a plurality of permanent magnets in a circumferential direction; and a stator that includes a stator core on which multi-phase stator coils are wound and is arranged facing the rotor with a predetermined air gap therebetween. The rotor has a structure in which the change pattern of magnetic properties of the rotor core or the permanent magnets changes stepwise in the circumferential direction. The stator has a structure in which the distribution pattern of a magnetic field generated by the stator coils with one phase or with a combination of the phases has uniqueness over a whole circumference.
    Type: Application
    Filed: May 13, 2014
    Publication date: September 4, 2014
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Sohji MURAKAMI, Motomichi OHTO, Kentaro INOMATA, Kozo IDE, Shinya MORIMOTO
  • Publication number: 20130279214
    Abstract: A power regenerative converter includes: a power conversion unit configured to convert AC power supplied from an AC power supply into DC power and convert DC power into AC power to be supplied as regenerative electric power to the AC power supply supply; an LCL filter including a reactor unit having a plurality of reactors connected in series between the power conversion unit and the AC power supply, and capacitors each having one end connected to a series connection point of the reactors in the reactor unit; a drive control unit for controlling the power conversion unit based on an AC voltage command; and a voltage command compensation unit for calculating a compensation value in accordance with a capacitor voltage being a voltage at the series connection point of the reactors and adding the compensation value to the AC voltage command input to the drive control unit.
    Type: Application
    Filed: April 10, 2013
    Publication date: October 24, 2013
    Applicant: Kabushiki Kaisha Yaskawa Denki
    Inventors: Yoshiyasu TAKASE, Kozo IDE, Shinya MORIMOTO, Hideaki IURA, Takahiro SAEKI
  • Patent number: 8450955
    Abstract: An alternating-current motor control apparatus includes an inverter unit, a current-command divider, a current controller, a torque-variation calculator, and a phase angle generator. The current-command divider is configured to divide a command current amplitude into command current components based on a phase-angle command value that is a sum of the phase angle and an alternating current signal. The torque-variation calculator is configured to calculate a motor electric power based on the command voltage and either the motor current or the command current components and to calculate a torque variation based on the motor electric power. The phase angle generator is configured to generate a phase angle based on the torque variation.
    Type: Grant
    Filed: May 12, 2010
    Date of Patent: May 28, 2013
    Assignees: Kabushiki Kaisha Yaskawa Denki
    Inventors: Kozo Ide, Shinya Morimoto, Sungmin Kim, Seung-ki Sul
  • Patent number: 8330402
    Abstract: An alternating-current motor control apparatus includes a voltage controller configured to output a command voltage vector so that the command voltage vector is time-averaged for time periods, a square-wave voltage generator configured to control, every time period, amplitudes and phases of voltages to be applied to an alternating-current motor, a current detector configured to detect motor currents at a timing synchronized with periods 1/N-th of the time periods, where N is equal to or larger than one, a coordinate transformation section configured to perform coordinate transformation to transform the motor currents into two-phase currents, an envelope extractor configured to extract two-phase currents as waveforms having amplitudes that periodically change from the two-phase currents, and extract envelopes of the waveforms, and a magnetic-pole-position computing section configured to compute a magnetic-pole position using the envelopes.
    Type: Grant
    Filed: January 20, 2010
    Date of Patent: December 11, 2012
    Assignees: Kabushiki Kaisha Yaskawa Denki
    Inventors: Kozo Ide, Shinya Morimoto, Masanobu Inazumi, Young Doo Yoon, Seung-ki Sul
  • Patent number: 8310183
    Abstract: A motor control device includes a current profile generator generating a current profile, a pilot voltage operator calculating a pilot pulse voltage, on the basis of the current profile, and adding the pilot pulse voltage to a voltage command on a d axis, a magnetic pole position detector detecting a position of a magnetic pole in the permanent magnet motor, on the basis of the pilot pulse voltage, a polarity identification evaluation current operator calculating a polarity identification evaluation current for identifying a polarity of the magnetic pole in the permanent magnet motor, on the basis of a current value on the d axis in the motor current that has been detected in synchronization with a period of PWM control, and a polarity detector outputting a phase correction amount, on the basis of a deviation between the polarity identification evaluation current and the current profile.
    Type: Grant
    Filed: June 4, 2012
    Date of Patent: November 13, 2012
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Kozo Ide, Masaki Hisatsune
  • Publication number: 20120268046
    Abstract: A control device for an alternating current motor according to embodiments includes a current distributor and a phase estimator. The current distributor divides a torque command by using a control phase and outputs a component that contributes to a mechanical output of the motor as a ?-axis current command and a component that does not contribute to the mechanical output as a ?-axis current command. The phase estimator computes a phase at which a ?-axis component of an addition amount of the output of the current controller and a voltage drop amount of inductance of the motor becomes zero and outputs the computed phase as the control phase.
    Type: Application
    Filed: February 29, 2012
    Publication date: October 25, 2012
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Akira Yamazaki, Kozo Ide
  • Publication number: 20120235609
    Abstract: A motor control device includes a current profile generator generating a current profile, a pilot voltage operator calculating a pilot pulse voltage, on the basis of the current profile, and adding the pilot pulse voltage to a voltage command on a d axis, a magnetic pole position detector detecting a position of a magnetic pole in the permanent magnet motor, on the basis of the pilot pulse voltage, a polarity identification evaluation current operator calculating a polarity identification evaluation current for identifying a polarity of the magnetic pole in the permanent magnet motor, on the basis of a current value on the d axis in the motor current that has been detected in synchronization with a period of PWM control, and a polarity detector outputting a phase correction amount, on the basis of a deviation between the polarity identification evaluation current and the current profile.
    Type: Application
    Filed: June 4, 2012
    Publication date: September 20, 2012
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Kozo IDE, Masaki HISATSUNE
  • Patent number: 8143839
    Abstract: An alternating-current motor control apparatus includes a stator frequency computing unit configured to compute a stator frequency of a motor magnetic flux; a torque error computing unit configured to compute a torque error by using the motor magnetic flux, an estimated current, and a motor current; and a speed estimator configured to estimate a speed of the alternating-current motor by using the stator frequency and the torque error. The speed estimator includes a proportional controller configured to reduce the torque error to zero, and an adaptive filter configured to eliminate a high-frequency component of the torque error.
    Type: Grant
    Filed: September 9, 2009
    Date of Patent: March 27, 2012
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Kozo Ide, Sadayuki Sato, Hideaki Iura, Shinya Morimoto
  • Patent number: 8143837
    Abstract: An inverter control apparatus includes: a state estimator that calculates an estimated current vector and an estimated magnetic flux vector from a motor command voltage vector, a detected current vector, and a motor parameter; a correction voltage calculator that calculates a correction voltage vector on the basis of a current error between the detected current vector and the estimated current vector; and a correction voltage unit that adds the correction voltage vector to the motor command voltage vector.
    Type: Grant
    Filed: February 22, 2010
    Date of Patent: March 27, 2012
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventor: Kozo Ide
  • Patent number: 8106621
    Abstract: A control device includes a slip calculator that calculates a first slip frequency of an induction motor, a current detector that detects motor current that passes through the induction motor, an adder that calculates a primary frequency by adding a speed command and a second slip frequency that are given, a command voltage generation unit that generates first command voltage from the primary frequency, a voltage error observer unit that estimates a command voltage error from the first command voltage and the motor current, a slip correction unit that calculates a slip correction amount from the command voltage error, an adder that calculates the second slip frequency by adding the first slip frequency and the slip correction amount, and a voltage error correction unit that corrects the first command voltage using the command voltage error and outputs second command voltage.
    Type: Grant
    Filed: June 23, 2009
    Date of Patent: January 31, 2012
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Sadayuki Sato, Hideaki Iura, Yoichi Yamamoto, Kozo Ide