Patents by Inventor Akira Furukawa

Akira Furukawa 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: 11329584
    Abstract: A control device applies voltages to an AC rotating machine based on voltage command values on stationary coordinates. Currents in a plurality phases flowing the rotating machine are detected as detection currents. Coordinate conversion is applied to those detection currents based on any phase in the rotating machine, for generate detection currents on rotational coordinates. Voltage command values on the rotational coordinates are generated based on current command values on the rotational coordinates and the detection currents. Coordinate conversion is applied to those voltage command values based on the any phase, for generate first voltage command values on the stationary coordinates. Phases of one of the first voltage command values and generated second voltage command values on the stationary coordinates are corrected to generate the second voltage command values. One of the second and the first voltage command values are selected as the voltage command values on the stationary coordinates.
    Type: Grant
    Filed: March 5, 2018
    Date of Patent: May 10, 2022
    Assignee: Mitsubishi Electric Cornoration
    Inventor: Akira Furukawa
  • Publication number: 20220120590
    Abstract: There has been a problem that a rotation second-order angle error due to a phase difference between a sine signal and a cosine signal deviating from ?/2 cannot be reduced. Therefore, provided is an angle detection device that can suppress a second-order angle error caused due to the phase difference between a first sine signal and a second sine signal deviating from ?/2, by calculating a detection angle from a first detection signal based on the sum of two sine signals having different phases and a second detection signal based on the difference of the two sine signals.
    Type: Application
    Filed: July 4, 2019
    Publication date: April 21, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventors: Akira FURUKAWA, Tatsuya MORI
  • Publication number: 20220120789
    Abstract: In a current detection apparatus which detects current flowing through the armature windings of plural phases of plural sets using each magnetic sensor which is disposed at a position the magnetic flux radially emitted from the rotor crosses, to provide a current detection apparatus which can suppress that the control accuracy of output torque is deteriorated by the current detection error which occurs due to the magnetic flux of the rotor. A current detection apparatus, wherein in each set, the magnetic sensors of n-phase are disposed so that an absolute value of a detection component of a rotor flux density which is a component of flux density of the rotor detected by the magnetic sensor of each phase become equal with each other.
    Type: Application
    Filed: August 5, 2021
    Publication date: April 21, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventor: Akira FURUKAWA
  • Publication number: 20220103110
    Abstract: A power conversion device is configured to acquire, from a current detector at a timing A, a first phase current detection value in a first phase being a phase corresponding to a phase voltage command to be compared to a first carrier wave signal, calculate a first phase current calculation value corresponding to the first phase based on an acquisition result, acquire, from the current detector at a timing B, a second phase current detection value in a second phase being a phase corresponding to a phase voltage command to be compared to a second carrier wave signal, and to calculate a second phase current calculation value corresponding to the second phase based on an acquisition result.
    Type: Application
    Filed: February 19, 2019
    Publication date: March 31, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventors: Tatsuya MORI, Akira FURUKAWA, Kenta KUBO
  • Publication number: 20220093660
    Abstract: Provided is an imaging element including a photoelectric conversion unit formed by stacking a first electrode, a photoelectric conversion layer and a second electrode. The photoelectric conversion unit further includes a charge storage electrode which is disposed to be spaced apart from the first electrode and disposed opposite to the photoelectric conversion layer via an insulating layer. The photoelectric conversion unit is formed of N number of photoelectric conversion unit segments, and the same applies to the photoelectric conversion layer, the insulating layer and the charge storage electrode. An nth photoelectric conversion unit segment is formed of an nth charge storage electrode segment, an nth insulating layer segment and an nth photoelectric conversion layer segment. As n increases, the nth photoelectric conversion unit segment is located farther from the first electrode. A thickness of the insulating layer segment gradually changes from a first to Nth photoelectric conversion unit segment.
    Type: Application
    Filed: December 1, 2021
    Publication date: March 24, 2022
    Applicant: SONY GROUP CORPORATION
    Inventors: Akira FURUKAWA, Yoshihiro ANDO, Hideaki TOGASHI, Fumihiko KOGA
  • Patent number: 11267503
    Abstract: To provide a motor control device capable of reducing noise without requiring preparation of a plurality of PWM carrier waves, an offset voltage is added equally to each phase of three-phase voltage command values from an inverter to output modified three-phase voltage command values, which are compared to a PWM carrier wave to output three-phase terminal voltages to a motor, and an offset voltage is switched among n offset candidate voltages (n is a natural number of three or more) having different values at set time intervals for output to vary timings to turn on and timings to turn off the three-phase terminal voltages equally for all phases.
    Type: Grant
    Filed: January 11, 2017
    Date of Patent: March 8, 2022
    Assignee: Mitsubishi Electric Cornoration
    Inventors: Tatsuya Mori, Takayuki Kifuku, Akira Furukawa
  • Publication number: 20220063715
    Abstract: Provided is a rotation angle detection device including: an intermediate signal generation unit configured to generate an intermediate signal based on a product of a sine signal and a cosine signal which are based on a rotation angle of a rotating body; a first multiplication unit; and a first rotation angle calculation unit. The intermediate signal generation unit includes: a first multiplier configured to calculate the product of the sine signal and the cosine signal; and a first low-pass filter configured to remove frequency components equal to or higher than twice a frequency of fundamental waves of the sine signal and the cosine signal from an output of the first multiplier.
    Type: Application
    Filed: January 22, 2019
    Publication date: March 3, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventors: Tatsuya MORI, Akira FURUKAWA
  • Patent number: 11237021
    Abstract: Provided are a failure determination device and method for a rotating machine control device, which are capable of detecting failure of a sensor configured to detect a rotational position of a rotating machine while the rotating machine is in operation. A rotation angle estimator calculates a rotation angle estimation value. A relationship between the rotation angle estimation value (?est), and a first angle detection value (?1) and a second angle detection value (?2), which are obtained from output signals of angle sensors configured to detect a rotational position of a rotating machine, is monitored while the rotating machine is in operation. In this manner, failure of the angle sensors, which are configured to detect the rotational position of the rotating machine, can be always detected even while the rotating machine is in operation.
    Type: Grant
    Filed: April 28, 2016
    Date of Patent: February 1, 2022
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tatsuya Mori, Isao Kezobo, Munenori Yamamoto, Akira Furukawa
  • Publication number: 20220024517
    Abstract: Provided is a rotation angle detection device including: a coefficient identification unit configured to identify, based on a sine signal and a cosine signal which are based on a rotation angle of a rotating body, coefficients of frequency components included in the sine signal and the cosine signal; a correction value calculation unit; and a rotation angle calculation unit. The coefficient identification unit is configured to identify, for each of integers M and N which satisfy a relationship in which M+N is equal to a positive constant, and each of which is equal to or larger than 0, a coefficient of each of (M+N?1)th order components included in the sine signal and the cosine signal, based on results of application of low-pass filters to products of an M-th power of the sine signal and an N-th power of the cosine signal.
    Type: Application
    Filed: January 22, 2019
    Publication date: January 27, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventors: Tatsuya MORI, Akira FURUKAWA
  • Patent number: 11222912
    Abstract: Provided is an imaging element including a photoelectric conversion unit formed by stacking a first electrode, a photoelectric conversion layer and a second electrode. The photoelectric conversion unit further includes a charge storage electrode which is disposed to be spaced apart from the first electrode and disposed opposite to the photoelectric conversion layer via an insulating layer. The photoelectric conversion unit is formed of N number of photoelectric conversion unit segments, and the same applies to the photoelectric conversion layer, the insulating layer and the charge storage electrode. An nth photoelectric conversion unit segment is formed of an nth charge storage electrode segment, an nth insulating layer segment and an nth photoelectric conversion layer segment. As n increases, the nth photoelectric conversion unit segment is located farther from the first electrode. A thickness of the insulating layer segment gradually changes from a first to Nth photoelectric conversion unit segment.
    Type: Grant
    Filed: November 14, 2017
    Date of Patent: January 11, 2022
    Assignee: SONY CORPORATION
    Inventors: Akira Furukawa, Yoshihiro Ando, Hideaki Togashi, Fumihiko Koga
  • Patent number: 11181558
    Abstract: Magnetic sensors each disposed to face each of current paths for each of windings with 2n phases (n is a multiple of three) in an AC rotating machine are included, and when each of a DC component and an AC component in a d-axis sum current and a q-axis sum current obtained by performing a dq-transformation into a two-axis coordinate system on 2n detection currents on the assumption that all current amplitudes of the windings are the same is represented collectively with each of terms expressed by sine functions with different phases, each of the current paths at each of 2n current path arrangement positions is arranged to have a positional relationship where error components are reduced by cancellation among coefficients included at least in one of the term or by cancellation among values of the terms.
    Type: Grant
    Filed: April 22, 2020
    Date of Patent: November 23, 2021
    Assignee: Mitsubishi Electric Corporation
    Inventors: Akira Furukawa, Kenichi Akita, Daisuke Sasaki
  • Patent number: 11165383
    Abstract: A power conversion device is configured to output on/off signals for switching on and off respective semiconductor switching elements of an inverter configured to invert a DC voltage output from a DC power supply into three-phase AC voltages so that, out of a plurality of voltage vectors defined so as to correspond to patterns of the on/off signals, the second closest voltage vector and the third closest voltage vector in phase to a current vector that is based on currents supplied as a result of output of the three-phase AC voltages from the inverter are formed.
    Type: Grant
    Filed: August 21, 2017
    Date of Patent: November 2, 2021
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tatsuya Mori, Akira Furukawa
  • Patent number: 11155294
    Abstract: An electric power steering apparatus includes: a torque sensor configured to detect a steering torque of a driver; a motor configured to assist in a steering force of the driver; a rotation angle estimation unit configured to estimate a rotation angle of the motor to output an estimated angle; a correction signal calculation unit configured to calculate a correction signal based on the steering torque; a frequency separation unit configured to separate the estimated angle into a first frequency component and a second frequency component; an estimated angle correction unit configured to calculate, as a control angle, a value obtained by adding a second-frequency-component corrected signal, which is obtained by correcting the second frequency component based on the correction signal, to the first frequency component; and an electric power supply unit configured to supply electric power to the motor based on the control angle.
    Type: Grant
    Filed: March 7, 2017
    Date of Patent: October 26, 2021
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yuya Tsuchimoto, Isao Kezobo, Yuji Takatsuka, Akira Furukawa
  • Publication number: 20210323603
    Abstract: An angle detection device such that an angle error is restricted even with respect to an angle signal component of an order other than that of an electrical angle frequency component included in an angle signal is obtained.
    Type: Application
    Filed: December 18, 2018
    Publication date: October 21, 2021
    Applicant: Mitsubishi Electric Corporation
    Inventors: Tatsuya MORI, Akira FURUKAWA
  • Patent number: 11152881
    Abstract: A control device includes: a first power converter applying a voltage to a first winding; a second power converter applying a voltage to a second winding; a first power supply circuit supplying power to the first power converter; a second power supply circuit supplying power to the second power converter; a current command calculator; a first current controller; and a second current controller. The second power supply circuit supplies power at a voltage higher than a voltage of the first power supply circuit. The current command calculator calculates a first voltage usage state, which is an indicator value correlated with a magnitude of the output voltage of the first power converter with respect to a power supply voltage output at a time of supply of power by the first power supply circuit, and calculates the second current command based on the first voltage usage state.
    Type: Grant
    Filed: March 13, 2018
    Date of Patent: October 19, 2021
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yuya Tsuchimoto, Isao Kezobo, Akira Furukawa
  • Patent number: 11150075
    Abstract: An angle detection device including: an angle sensor AGSE outputting first and second sine wave signals SINWS1, SINWS2 having phases that are different from each other by 90 degrees in accordance with rotation of a detection target; an angle calculator calculating an angle signal corresponding to a rotation angle of the detection target based on SINWS1 and SINWS2; and an angle sensor AGSE abnormality determiner ASAD determining an abnormality of AGSE based on SINWS1 and SINWS2. The ASAD includes: an amplitude signal calculator calculating an amplitude signal MALS based on a square root of a sum of squares of SINWS1 and SINWS2; a first angle signal ANGS1 calculation processor calculating ANGS1 based on SINWS1 and MALS; a second angle signal ANGS2 calculation processor calculating ANGS2 based on SINWS2 and MALS; and an abnormality determination processor determining the abnormality of AGSE based on an error between ANGS1 and ANGS2.
    Type: Grant
    Filed: April 28, 2016
    Date of Patent: October 19, 2021
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tatsuya Mori, Isao Kezobo, Munenori Yamamoto, Akira Furukawa
  • Patent number: 11130518
    Abstract: When a voltage application command is outputted to a three-phase winding of one system, a d-axis proportionality constant and a q-axis proportionality constant are set with Ld and Lq, respectively, as parameters; when voltage application commands are outputted to three-phase windings of two systems, a d-axis proportionality constant and a q-axis proportionality constant are set with [Ld+Md] and [Lq+Mq], respectively, as parameters.
    Type: Grant
    Filed: November 14, 2016
    Date of Patent: September 28, 2021
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tatsuya Mori, Akira Furukawa, Isao Kezobo
  • Publication number: 20210249474
    Abstract: There is provided a solid-state image sensor, a solid-state imaging device, an electronic apparatus, and a method of manufacturing a solid-state image sensor capable of improving characteristics. There is provided a solid-state image sensor including a stacked structure that includes a semiconductor substrate, a first photoelectric converter provided above the semiconductor substrate and converting light into charges, and a second photoelectric converter provided above the first photoelectric converter and converting light into charges, where the first photoelectric converter and the second photoelectric converter include a photoelectric conversion stacked structure in which a common electrode, a photoelectric conversion film, and a readout electrode are stacked so that the first photoelectric converter and the second photoelectric converter are in a line-symmetrical relationship with each other with a vertical plane perpendicular to a stacking direction of the stacked structure as an axis of symmetry.
    Type: Application
    Filed: June 11, 2019
    Publication date: August 12, 2021
    Applicants: SONY CORPORATION, SONY SEMICONDUCTOR SOLUTIONS CORPORATION
    Inventors: Hideaki TOGASHI, Iwao YAGI, Masahiro JOEI, Fumihiko KOGA, Kenichi MURATA, Shintarou HIRATA, Yosuke SAITO, Akira FURUKAWA
  • Publication number: 20210246962
    Abstract: A damping device includes: a housing; a drive-side actuator that includes a drive-side stator and a drive-side mover and is connected to the housing; a damping-side actuator that includes a damping-side stator and a damping-side mover and is connected to the housing; a first signal calculator that generates a drive signal for the drive-side actuator based on a control command; and a second signal calculator that generates a drive signal for the damping-side actuator based on the control command to reduce or offset, by a vibration component of the housing produced by driving of the damping-side actuator, a natural frequency component of the housing produced by driving of the drive-side actuator.
    Type: Application
    Filed: June 5, 2019
    Publication date: August 12, 2021
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Akira Furukawa, Hiroshi Fujiwara
  • Patent number: 11070113
    Abstract: In an electric rotating machine including an output shaft, a magnetic body fixed inside a case surrounding the output shaft, a sensor magnet fixed to the output shaft and generating a magnetic field for detecting a rotational angle of the output shaft and a rotation sensor fixed inside the case, arranged between the magnetic body and the sensor magnet in an axial direction of the output shaft and outputting a signal in accordance with the intensity of the magnetic field for detecting the rotational angle, N-pole and S-pole are magnetized in a circumferential direction around the output shaft in the sensor magnet and the rotation sensor is arranged in an area in which amplitudes of a radial-direction component Br around the output shaft and a circumferential-direction component B? in a magnetic flux density B of the magnetic field are equivalent.
    Type: Grant
    Filed: April 22, 2016
    Date of Patent: July 20, 2021
    Assignee: Mitsubishi Electric Corporation
    Inventors: Akira Furukawa, Akihiko Mori