Patents by Inventor Eiji Wada

Eiji Wada 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: 11125654
    Abstract: An abnormality cause identifying system for a device including a rotating member includes: acceleration sensors, a pickup sensor, and a temperature sensor, which observe a state of a rotating member and acquire a measurement data piece; a measurement data piece converting portion configured to convert the measurement data piece into two or more new-format conversion data pieces that are different from each other; and an abnormality cause identifying portion configured to identify an abnormality cause of the device by analyzing the conversion data pieces created by the measurement data piece converting portion.
    Type: Grant
    Filed: May 17, 2018
    Date of Patent: September 21, 2021
    Assignee: KAWASAKI JUKOGYO KABUSHIKI KAISHA
    Inventors: Eiji Sato, Hisao Wada
  • Patent number: 11069549
    Abstract: An overhead transport vehicle includes: a traveler; a main body; a transferer including a holder, a mover, and a rotator, and which receives or delivers an article from or to a transfer destination; and a controller. The main body has an inner wall at a position at which the article held by the holder comes in contact therewith when the holder set at a storing position is rotated by a predetermined angle by the rotator. The controller causes the traveler to travel while the holder is at the storing position, and when the article is received or delivered, causes the rotator to rotate the holder by a predetermined angle or more about a rotation axis in a state where the holder is set at an exiting position by the mover to align the article with a prescribed orientation of the transfer destination.
    Type: Grant
    Filed: July 6, 2018
    Date of Patent: July 20, 2021
    Assignee: Murata Machinery, Ltd.
    Inventor: Eiji Wada
  • Patent number: 11027949
    Abstract: A transport vehicle includes a body; a lift platform that includes a holder to hold an article, the lift platform being ascendable and descendable with respect to the body; a lift driver that raises or lowers the lift platform by feeding out or taking up a flexible suspension support; a sensor provided in the lift driver and emits a detection wave having directivity toward a certain lower position; a lateral extender that causes the lift driver to project laterally from the body while providing cantilever support for the lift driver; and a corrector that corrects a shift in an emission direction of the detection wave that arises from bending of the lateral extender in a state in which the lift driver is caused to project laterally from the body by the lateral extender.
    Type: Grant
    Filed: March 30, 2017
    Date of Patent: June 8, 2021
    Assignee: Murata Machinery, Ltd.
    Inventor: Eiji Wada
  • Patent number: 11014602
    Abstract: A power conversion device may include a first inverter to which a first end of each phase winding of the electric motor is coupled; a second inverter to which a second end of each phase winding is coupled; a first phase isolation relay circuit structured to switch between connection and disconnection of the one end of each phase winding to and from the first inverter; and a first neutral point relay circuit to which the one end of each phase winding is coupled and which is structured to switch between connection and disconnection of the one end of each phase winding to and from the one end of each other phase winding.
    Type: Grant
    Filed: March 1, 2017
    Date of Patent: May 25, 2021
    Assignee: NIDEC CORPORATION
    Inventors: Eiji Wada, Kaori Nabeshi
  • Patent number: 10998842
    Abstract: A power conversion device includes a first inverter connected to first ends of windings of each phase of a motor, a second inverter connected to second ends of the windings of each phase, a phase separation relay circuit to switch between connection and disconnection between the first ends of the windings of each phase and the first inverter, a neutral point relay circuit connected to the first ends of the windings of each phase and to switch between connection and disconnection between the first ends of the windings of each phase, a first switching element to switch between connection and disconnection between the second inverter and a power supply, and a second switching element to switch between connection and disconnection between the second inverter and a ground.
    Type: Grant
    Filed: December 22, 2017
    Date of Patent: May 4, 2021
    Assignee: NIDEC CORPORATION
    Inventors: Eiji Wada, Hiromitsu Ohashi
  • Patent number: 10926790
    Abstract: A vehicle-mounted electronic controller includes a motor case that accommodates an electric motor, a lid body of the motor case, power circuitry including switching circuits that supply driving signals to the electric motor, and control circuitry including a control circuit that controls the switching circuits. The case further accommodates the power circuitry and the control circuitry. The lower surface of the lid body contacts the power circuitry. Each of the case and the lid body has a heat radiation property. The upper surface of the lid body is exposed. A vehicle-mounted mechanically/electrically integrated electric motor includes the vehicle-mounted electronic controller and the electric motor.
    Type: Grant
    Filed: February 5, 2015
    Date of Patent: February 23, 2021
    Assignee: NIDEC ELESYS CORPORATION
    Inventors: Eiji Wada, Kazuki Harada, Hitoshi Kuroyanagi
  • Patent number: 10778084
    Abstract: A power conversion device according to an embodiment of the present invention includes a first inverter to which one end of each of n phase windings (n is an integer of three or more) included in an electric motor is coupled, a second inverter to which the other end of each phase winding is coupled, and a switch circuit having at least one of: a first switch element that switches between connection and disconnection of the first inverter and ground, and a second switch element that switches between connection and disconnection of the second inverter and ground.
    Type: Grant
    Filed: March 1, 2017
    Date of Patent: September 15, 2020
    Assignee: NIDEC CORPORATION
    Inventor: Eiji Wada
  • Publication number: 20200270102
    Abstract: A transport vehicle includes a body; a lift platform that includes a holder to hold an article, the lift platform being ascendable and descendable with respect to the body; a lift driver that raises or lowers the lift platform by feeding out or taking up a flexible suspension support; a sensor provided in the lift driver and emits a detection wave having directivity toward a certain lower position; a lateral extender that causes the lift driver to project laterally from the body while providing cantilever support for the lift driver; and a corrector that corrects a shift in an emission direction of the detection wave that arises from bending of the lateral extender in a state in which the lift driver is caused to project laterally from the body by the lateral extender.
    Type: Application
    Filed: March 30, 2017
    Publication date: August 27, 2020
    Inventor: Eiji Wada
  • Publication number: 20200251366
    Abstract: An overhead transport vehicle includes: a traveler; a main body; a transferer including a holder, a mover, and a rotator, and which receives or delivers an article from or to a transfer destination; and a controller. The main body has an inner wall at a position at which the article held by the holder comes in contact therewith when the holder set at a storing position is rotated by a predetermined angle by the rotator. The controller causes the traveler to travel while the holder is at the storing position, and when the article is received or delivered, causes the rotator to rotate the holder by a predetermined angle or more about a rotation axis in a state where the holder is set at an exiting position by the mover to align the article with a prescribed orientation of the transfer destination.
    Type: Application
    Filed: July 6, 2018
    Publication date: August 6, 2020
    Inventor: Eiji Wada
  • Patent number: 10574172
    Abstract: A power conversion device may include a first inverter to which a first end of each phase winding is coupled; a second inverter to which a second end of each phase winding is coupled; a plurality of switching elements provided in the first and second inverters; a control circuit structured to perform n-phase conduction control on the first and second inverters; and a detection circuit structured to detect a failure in the switching elements. The control circuit is structured such that, when the detection circuit has detected a failure in any of the plurality of switching elements, the control circuit changes the control of the first and second inverters from the n-phase conduction control to m-phase conduction control using m phases of the n phases different from the phase of a winding coupled to the failed switching element, m being an integer not smaller than two and smaller than n.
    Type: Grant
    Filed: March 1, 2017
    Date of Patent: February 25, 2020
    Assignee: NIDEC CORPORATION
    Inventor: Eiji Wada
  • Publication number: 20190372501
    Abstract: A power conversion device includes a first inverter connected to first ends of windings of each phase of a motor, a second inverter connected to second ends of the windings of each phase, a phase separation relay circuit to switch between connection and disconnection between the first ends of the windings of each phase and the first inverter, a neutral point relay circuit connected to the first ends of the windings of each phase and to switch between connection and disconnection between the first ends of the windings of each phase, a first switching element to switch between connection and disconnection between the second inverter and a power supply, and a second switching element to switch between connection and disconnection between the second inverter and a ground.
    Type: Application
    Filed: December 22, 2017
    Publication date: December 5, 2019
    Inventors: Eiji WADA, Hiromitsu OHASHI
  • Publication number: 20190097522
    Abstract: A power conversion device according to an embodiment of the present invention includes a first inverter to which one end of each of n phase windings (n is an integer of three or more) included in an electric motor is coupled, a second inverter to which the other end of each phase winding is coupled, and a switch circuit having at least one of: a first switch element that switches between connection and disconnection of the first inverter and ground, and a second switch element that switches between connection and disconnection of the second inverter and ground.
    Type: Application
    Filed: March 1, 2017
    Publication date: March 28, 2019
    Inventor: Eiji WADA
  • Publication number: 20190089287
    Abstract: A power conversion device may include a first inverter to which a first end of each phase winding is coupled; a second inverter to which a second end of each phase winding is coupled; a plurality of switching elements provided in the first and second inverters; a control circuit structured to perform n-phase conduction control on the first and second inverters; and a detection circuit structured to detect a failure in the switching elements. The control circuit is structured such that, when the detection circuit has detected a failure in any of the plurality of switching elements, the control circuit changes the control of the first and second inverters from the n-phase conduction control to m-phase conduction control using m phases of the n phases different from the phase of a winding coupled to the failed switching element, m being an integer not smaller than two and smaller than n.
    Type: Application
    Filed: March 1, 2017
    Publication date: March 21, 2019
    Inventor: Eiji WADA
  • Publication number: 20190077449
    Abstract: A power conversion device may include a first inverter to which a first end of each phase winding of the electric motor is coupled; a second inverter to which a second end of each phase winding is couple& a first phase isolation relay circuit structured to switch between connection and disconnection of the one end of each phase winding to and from the first inverter; and a first neutral point relay circuit to which the one end of each phase winding is coupled and which is structured to switch between connection and disconnection of the one end of each phase winding to and from the one end of each other phase winding.
    Type: Application
    Filed: March 1, 2017
    Publication date: March 14, 2019
    Inventors: Eiji WADA, Kaori NABESHI
  • Publication number: 20180375457
    Abstract: A power conversion device may include a first inverter to which one end of each phase winding of a motor is coupled, a second inverter to which the other end of each phase winding is coupled, and a switch circuit having at least one of a first switch element that switches between connection and disconnection of the first inverter to and from a ground, a first protection circuit being coupled in parallel to the first switch element, and a second switch element that switches between connection and disconnection of the second inverter to and from the ground, a second protection circuit being coupled in parallel to the second switch element.
    Type: Application
    Filed: September 4, 2018
    Publication date: December 27, 2018
    Inventors: Takashi KITAMURA, Eiji WADA
  • Patent number: 9540036
    Abstract: An electronic control apparatus configured to control electric power steering and provided integrally with an electric motor is electrically connected to an ignition switch and which assists a rotation operation of a steering column by rotation of the electric motor. A first magnetism detecting element configured to operate using power supplied via the ignition switch to output a first set of rotation angle signals of the electric motor. A second magnetism detecting element configured to operate continuously using continuously supplied power to output a second set of rotation angle signals of the electric motor. A controller configured or programmed to generate rotation angle information about the electric motor based on the first set of rotation angle signals and the second set of rotation angle signals outputted while the ignition switch is stopped and to calculate a position of a steering wheel from the generated rotation angle information.
    Type: Grant
    Filed: December 19, 2014
    Date of Patent: January 10, 2017
    Assignee: Nidec Elesys Corporation
    Inventors: Kazuki Harada, Tokuji Tatewaki, Eiji Wada, Osamu Maeshima, Masatoshi Matsuzaki
  • Publication number: 20160347353
    Abstract: [Problem to be Solved] To provide a vehicle-mounted electronic control unit or a vehicle-mounted mechanically/electrically integrated electric motor, the vehicle-mounted electronic control unit or the vehicle-mounted mechanically/electrically integrated electric motor having high heat radiation efficiency and being small in size. [Solution] A vehicle-mounted electronic control unit includes a motor case 430 capable of accommodating an electric motor 43, a lid body 431 of the motor case 430, a power section 100 including switching circuits FET 1 to FET 6 that supply driving signals to the electric motor 43, and a control section 300 including a control circuit that controls the switching circuits FET 1 to FET 6. The case 430 further accommodates the power section 100 and the control section 300. The lower surface of the lid body 431 is set in contact with the power section 100. Each of the case 430 and the lid body 431 has a heat radiation property. The upper surface of the lid body 431 is exposed.
    Type: Application
    Filed: February 5, 2015
    Publication date: December 1, 2016
    Inventors: Eiji WADA, Kazuki HARADA, Hitoshi KUROYANAGI
  • Patent number: 9231017
    Abstract: An optical component is fixed precisely on a sensor chip. After a sensor chip including a front surface having a sensor plane with a plurality of light receiving elements is mounted face-up over a wiring substrate, an adhesive is disposed on the front surface of the sensor chip at a plurality of positions, and a plurality of spacers having adherence is formed by curing this adhesive. Then, an adhesive paste is disposed on the front surface of the sensor chip. Then, an optical component held by a bonding tool is disposed on the front surface via the spacer and the adhesive. After that, the bonding tool is separated from the optical component and the optical component is fixed by curing the adhesive in a state in which a load is not applied to the optical component.
    Type: Grant
    Filed: April 1, 2014
    Date of Patent: January 5, 2016
    Assignee: Renesas Electronics Corporation
    Inventor: Eiji Wada
  • Publication number: 20150175191
    Abstract: An electronic control apparatus configured to control electric power steering and provided integrally with an electric motor is electrically connected to an ignition switch and which assists a rotation operation of a steering column by rotation of the electric motor. A first magnetism detecting element configured to operate using power supplied via the ignition switch to output a first set of rotation angle signals of the electric motor. A second magnetism detecting element configured to operate continuously using continuously supplied power to output a second set of rotation angle signals of the electric motor. A controller configured or programmed to generate rotation angle information about the electric motor based on the first set of rotation angle signals and the second set of rotation angle signals outputted while the ignition switch is stopped and to calculate a position of a steering wheel from the generated rotation angle information.
    Type: Application
    Filed: December 19, 2014
    Publication date: June 25, 2015
    Inventors: Kazuki HARADA, Tokuji TATEWAKI, Eiji WADA, Osamu MAESHIMA, Masatoshi MATSUZAKI
  • Publication number: 20140213009
    Abstract: An optical component is fixed precisely on a sensor chip. After a sensor chip including a front surface having a sensor plane with a plurality of light receiving elements is mounted face-up over a wiring substrate, an adhesive is disposed on the front surface of the sensor chip at a plurality of positions, and a plurality of spacers having adherence is formed by curing this adhesive. Then, an adhesive paste is disposed on the front surface of the sensor chip. Then, an optical component held by a bonding tool is disposed on the front surface via the spacer and the adhesive. After that, the bonding tool is separated from the optical component and the optical component is fixed by curing the adhesive in a state in which a load is not applied to the optical component.
    Type: Application
    Filed: April 1, 2014
    Publication date: July 31, 2014
    Applicant: Renesas Electronics Corporation
    Inventor: Eiji WADA