Patents by Inventor Makoto Kanemaru

Makoto Kanemaru 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: 11277000
    Abstract: In a DC feed system configured by a plurality of DC electrical circuits being combined, when an arc fault occurs, it is difficult to identify a DC electrical circuit in which an arc has occurred. For this reason, a DC electrical circuit protection apparatus includes: a plurality of DC electrical circuits, each of which has a current sensor provided in at least one of a positive or a negative electrical path and has arc noise absorbing mechanism on the upstream side of the current sensor; and an arc detection device which compares respective arc noise signal strengths of the DC electrical circuits from current signals detected by the current sensors of the DC electrical circuits, and based on the signal strengths, identifies a circuit in which an arc has occurred, wherein a DC electrical circuit in which an arc has occurred is identified.
    Type: Grant
    Filed: March 24, 2017
    Date of Patent: March 15, 2022
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Makoto Kanemaru, Mitsugi Mori, Mitsuru Tsukima
  • Publication number: 20220006417
    Abstract: Provided is an abnormality diagnosis device including: a physical quantity measurement processor configured to acquire, as time-series data, a physical quantity of an electric motor or a load; a feature parameter calculation processor configured to calculate feature parameters; a correlation function creation processor configured to create a correlation function for two or more feature parameters, and calculate a correlation coefficient corresponding to a measurement result of the physical quantity that changes depending on an abnormality occurrence state; a database configured to store in advance reference data in which a remaining time until a failure is caused and the correlation coefficient are associated with each other; and a diagnosis processor configured to extract from the reference data the remaining time corresponding to the correlation coefficient, and identify the remaining time until the electric motor or the load causes a failure or a part that has caused a failure.
    Type: Application
    Filed: December 27, 2018
    Publication date: January 6, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventors: Hiroshi INOUE, Makoto KANEMARU, Junji HORI, Tomoaki TAKEWA, Takuma SASAI
  • Patent number: 11099101
    Abstract: A system for estimating a severity of a bearing fault in an induction motor, uses a set of filters and a set of quantitative models designed for a set of fault frequencies. The system, upon receiving the measurements of the stator current, extracts the first fault current from the stator current using the first filter, determine the first mutual inductance variation from the first fault current using the first quantitative model, and classify the first mutual inductance variation with the fault severity classifier to determine the severity of a first type of fault in the induction motor. Similarly, the system classifies a second type of fault using the second filter and the second quantitative model. The system outputs one or combination of the severity of the first type of fault in the induction motor and the severity of the second type of fault in the induction motor.
    Type: Grant
    Filed: July 18, 2019
    Date of Patent: August 24, 2021
    Assignees: Mitsubishi Electric Research Laboratories, Inc., Mitsubishi Electric Corporation
    Inventors: Bingnan Wang, Shen Zhang, Makoto Kanemaru, Chungwei Lin, Dehong Liu, Koon Hoo Teo
  • Patent number: 10883895
    Abstract: The power transmission mechanism abnormality diagnostic device includes a monitoring diagnosis unit for performing determination as to abnormality of a power transmission mechanism, and a current detector connected to a power supply of an electric motor, wherein the monitoring diagnosis unit includes an analysis unit for analyzing current transmitted from the current detector and an abnormality determination unit for performing determination as to abnormality of the power transmission mechanism on the basis of a result of analysis by the analysis unit.
    Type: Grant
    Filed: September 1, 2017
    Date of Patent: January 5, 2021
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Makoto Kanemaru, Mitsuru Tsukima, Takuya Ohkubo, Tomoko Takasuka, Toshihiko Miyauchi
  • Publication number: 20200348207
    Abstract: A system for estimating a severity of a bearing fault in an induction motor, uses a set of filters and a set of quantitative models designed for a set of fault frequencies. The system, upon receiving the measurements of the stator current, extracts the first fault current from the stator current using the first filter, determine the first mutual inductance variation from the first fault current using the first quantitative model, and classify the first mutual inductance variation with the fault severity classifier to determine the severity of a first type of fault in the induction motor. Similarly, the system classifies a second type of fault using the second filter and the second quantitative model. The system outputs one or combination of the severity of the first type of fault in the induction motor and the severity of the second type of fault in the induction motor.
    Type: Application
    Filed: July 18, 2019
    Publication date: November 5, 2020
    Applicants: Mitsubishi Electric Research Laboratories, Inc., Mitsubishi Electric Corporation
    Inventors: Bingnan Wang, Shen Zhang, Makoto Kanemaru, Chungwei Lin, Dehong Liu, Koon Hoo Teo
  • Publication number: 20200284690
    Abstract: The power transmission mechanism abnormality diagnostic device includes a monitoring diagnosis unit for performing determination as to abnormality of a power transmission mechanism, and a current detector connected to a power supply of an electric motor, wherein the monitoring diagnosis unit includes an analysis unit for analyzing current transmitted from the current detector and an abnormality determination unit for performing determination as to abnormality of the power transmission mechanism on the basis of a result of analysis by the analysis unit.
    Type: Application
    Filed: September 1, 2017
    Publication date: September 10, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Makoto KANEMARU, Mitsuru TSUKIMA, Takuya OHKUBO, Tomoko TAKASUKA, Toshihiko MIYAUCHI
  • Publication number: 20200217895
    Abstract: An abnormality diagnosis device includes: a data acquirer to acquire a current waveform and a driving frequency of an electric motor; a storage which stores a combination of a current value of the current waveform and the driving frequency at an identical time by the data acquirer; a data determiner to determine whether or not a current value of the current waveform and the driving frequency as a diagnosis target at an identical time by the data acquisition match the combination stored in the storage; an analyzer to perform frequency analysis for the current waveform determined to be matched by the data determiner, to extract sideband waves, and calculate a spectrum intensity of the sideband waves; and an abnormality diagnosis processor to make a diagnosis that abnormality has occurred, when the spectrum intensity of the sideband waves is equal to or greater than a threshold.
    Type: Application
    Filed: October 24, 2017
    Publication date: July 9, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Makoto KANEMARU, Takuya OHKUBO, Sota SANO, Akira SATAKE, Satoru TERASHIMA
  • Publication number: 20190296539
    Abstract: In a DC feed system configured by a plurality of DC electrical circuits being combined, when an arc fault occurs, it is difficult to identify a DC electrical circuit in which an arc has occurred. For this reason, a DC electrical circuit protection apparatus includes: a plurality of DC electrical circuits, each of which has a current sensor provided in at least one of a positive or a negative electrical path and has arc noise absorbing mechanism on the upstream side of the current sensor; and an arc detection device which compares respective arc noise signal strengths of the DC electrical circuits from current signals detected by the current sensors of the DC electrical circuits, and based on the signal strengths, identifies a circuit in which an arc has occurred, wherein a DC electrical circuit in which an arc has occurred is identified.
    Type: Application
    Filed: March 24, 2017
    Publication date: September 26, 2019
    Applicant: Mitsubishi Electric Corporation
    Inventors: Makoto KANEMARU, Mitsugi MORI, Mitsuru TSUKIMA
  • Patent number: 9866017
    Abstract: A DC power generation system in which an arc detector, comprising an arc noise analysis unit which detects an arc which occurs in a DC power generation system based on noise of signal of a voltage-current sensor, a voltage-current variation analysis unit for specifying an arc occurrence point in a case where an arc is detected in the arc noise analysis unit, a voltage-current operation point of output of each string is analyzed based on a signal from a voltage-current sensor and based on variation of voltage-current operation point before and after when an arc is detected and a switch control unit for controlling of opening or closing of a switch based on an arc specified result in a voltage-current variation analysis unit, is provided.
    Type: Grant
    Filed: January 17, 2014
    Date of Patent: January 9, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Makoto Kanemaru, Takeshi Shindoi, Tomotaka Yano
  • Publication number: 20160181799
    Abstract: A DC power generation system in which an arc detector, comprising an arc noise analysis unit which detects an arc which occurs in a DC power generation system based on noise of signal of a voltage-current sensor, a voltage-current variation analysis unit for specifying an arc occurrence point in a case where an arc is detected in the arc noise analysis unit, a voltage-current operation point of output of each string is analyzed based on a signal from a voltage-current sensor and based on variation of voltage-current operation point before and after when an arc is detected and a switch control unit for controlling of opening or closing of a switch based on an arc specified result in a voltage-current variation analysis unit, is provided.
    Type: Application
    Filed: January 17, 2014
    Publication date: June 23, 2016
    Applicant: Mitsubishi Electric Corporation
    Inventors: Makoto KANEMARU, Takeshi SHINDOI, Tomotaka YANO
  • Publication number: 20110167184
    Abstract: An access control apparatus includes: a determination section; and an update section.
    Type: Application
    Filed: December 2, 2010
    Publication date: July 7, 2011
    Applicant: Sony Corporation
    Inventors: Yoshito SUZUKI, Makoto Kanemaru