Patents by Inventor Koji Maki
Koji Maki 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).
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Patent number: 11920591Abstract: An electric oil pump includes a motor including a motor shaft, a pump assembly including a vane pump driven by the motor to suction and discharge oil, and an inverter to drive the motor. The motor includes a rotor, a stator on a side outward from the rotor in a radial direction, and a motor housing containing the rotor and the stator. The motor housing includes a suction port through which the vane pump suctions oil from outside, and a discharge port through which the vane pump discharges oil to outside. The motor housing includes flat surface portions in a portion of an outer periphery thereof. The suction port and the discharge port are located in a first surface of side surfaces which are the flat surface portions of the motor housing and are parallel or substantially parallel to the axial direction.Type: GrantFiled: September 20, 2019Date of Patent: March 5, 2024Assignees: NIDEC TOSOK CORPORATION, KYB CORPORATIONInventors: Koji Higuchi, Yutaka Hashimoto, Yoshiyuki Maki, Kohei Kubo
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Publication number: 20230308030Abstract: An apparatus according to an emvodiment includes upper arm circuits, lower arm circuits and a flying capacitor. Each of the upper arm circuits is configured in such a manner that one or more first switch circuits each including a first switching element are connected in series. Each of the lower arm circuits is configured in such a manner that one or more second switch circuits each including a second switching element are connected in series. The apparatus includes a first circuit configured to cause a capacitor to be connected in parallel with the power storage via the first switching element; and a second circuit configured to cause a capacitor to be connected in parallel with the power storage via the second switching element.Type: ApplicationFiled: January 24, 2023Publication date: September 28, 2023Applicant: Toshiba Infrastructure Systems & Solutions CorporationInventors: Koji MAKI, Hiroshi MOCHIKAWA
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Patent number: 11664737Abstract: According to the present embodiment, a DC transformation system includes a rectifier, a first power conversion device, a second power conversion device, and a control device. The rectifier rectifies AC power supplied from an AC power source and outputs a first DC voltage. The first power conversion device is connected in series to the rectifier and outputs a second DC voltage. The second power conversion device is connected in parallel to the rectifier and converts power supplied from the rectifier to supply the converted power to the first power conversion device. The control device controls the first power conversion device to cause an addition/subtraction voltage of the first DC voltage and the second DC voltage to be a predetermined voltage.Type: GrantFiled: November 9, 2020Date of Patent: May 30, 2023Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA INFRASTRUCTURE SYSTEMS & SOLUTIONS CORPORATIONInventors: Koji Maki, Masayuki Nogi
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Patent number: 11509242Abstract: An apparatus according to an embodiment includes an upper and lower arm connected between a high and a low potential end; a first capacitor connected at one end to the high potential end; a second capacitor connected at one end to the low potential end; a first regenerative rectifier circuit connected to another end of the first capacitor; a second regenerative rectifier circuit connected to another end of the second capacitor; a first conversion circuit to cause energy stored in the first capacitor to be discharged; and a second conversion circuit to cause energy stored in the second capacitor to be discharged.Type: GrantFiled: May 28, 2021Date of Patent: November 22, 2022Assignee: Toshiba Infrastructure Systems & Solutions CorporationInventors: Koji Maki, Hiroshi Mochikawa
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Publication number: 20210408943Abstract: An apparatus according to an embodiment includes an upper and lower arm connected between a high and a low potential end; a first capacitor connected at one end to the high potential end; a second capacitor connected at one end to the low potential end; a first regenerative rectifier circuit connected to another end of the first capacitor; a second regenerative rectifier circuit connected to another end of the second capacitor; a first conversion circuit to cause energy stored in the first capacitor to be discharged; and a second conversion circuit to cause energy stored in the second capacitor to be discharged.Type: ApplicationFiled: May 28, 2021Publication date: December 30, 2021Applicant: Toshiba Infrastructure Systems & Solutions CorporationInventors: Koji MAKI, Hiroshi MOCHIKAWA
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Patent number: 10938319Abstract: According to an embodiment, there is provided an apparatus which can hold down an energy loss and can avoid an increase in size. The apparatus includes a cell including a floating capacitor connected in parallel to an upper-side switching element and a lower-side switching element; an upper arm include including first switch circuits, each including a first switching element, a first diode and a first capacitor, are connected in series; a lower arm including second switch circuits, each including a second switching element, a second diode and a second capacitor, are connected in series; and a circuit which connects a low-side terminal of the cell and a low-side terminal of the first capacitor and connects a high-side terminal of the cell and a high-side terminal of the second capacitor.Type: GrantFiled: July 17, 2020Date of Patent: March 2, 2021Assignee: Toshiba Infrastructure Systems & Solutions CorporationInventors: Koji Maki, Hiroshi Mochikawa, Yushi Koyama, Shunsuke Tamada, Takuro Arai, Ryuichi Morikawa, Mami Mizutani
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Publication number: 20210058004Abstract: According to the present embodiment, a DC transformation system includes a rectifier, a first power conversion device, a second power conversion device, and a control device. The rectifier rectifies AC power supplied from an AC power source and outputs a first DC voltage. The first power conversion device is connected in series to the rectifier and outputs a second DC voltage. The second power conversion device is connected in parallel to the rectifier and converts power supplied from the rectifier to supply the converted power to the first power conversion device. The control device controls the first power conversion device to cause an addition/subtraction voltage of the first DC voltage and the second DC voltage to be a predetermined voltage.Type: ApplicationFiled: November 9, 2020Publication date: February 25, 2021Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA INFRASTRUCTURE SYSTEMS & SOLUTIONS CORPORATIONInventors: Koji MAKI, Masayuki NOGI
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Publication number: 20200350832Abstract: According to an embodiment, there is provided an apparatus which can hold down an energy loss and can avoid an increase in size. The apparatus includes a cell including a floating capacitor connected in parallel to an upper-side switching element and a lower-side switching element; an upper arm include including first switch circuits, each including a first switching element, a first diode and a first capacitor, are connected in series; a lower arm including second switch circuits, each including a second switching element, a second diode and a second capacitor, are connected in series; and a circuit which connects a low-side terminal of the cell and a low-side terminal of the first capacitor and connects a high-side terminal of the cell and a high-side terminal of the second capacitor.Type: ApplicationFiled: July 17, 2020Publication date: November 5, 2020Applicant: Toshiba Infrastructure Systems & Solutions CorporationInventors: Koji MAKI, Hiroshi Mochikawa, Yushi Koyama, Shunsuke Tamada, Takuro Arai, Ryuichi Morikawa, Mami Mizutani
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Patent number: 10381842Abstract: A power supply system of an embodiment has a plurality of power conditioners, an acquisition device, and a search instruction generator. The power conditioners convert a form of electrical power generated by a plurality of electrical generators into a different form of electrical power. The acquisition device acquires a respective information regarding power output from each of the plurality of power conditioners. The search instruction generator generates and outputs an operating point search instruction to one or more power conditioners being lower in a ratio of output power with respect to a reference power by at least a prescribed degree than one or more different power conditioners, wherein the reference power is given, based on the maximum output power or rated power of the corresponding electrical generator, or based on the maximum output power or rated power of the power conditioner.Type: GrantFiled: September 9, 2016Date of Patent: August 13, 2019Assignee: Kabushiki Kaisha ToshibaInventors: Koji Maki, Hiroshi Mochikawa, Makoto Kumai, Hiroaki Matsumoto, Shingo Yanagimoto, Akihiro Matsui
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Patent number: 10097006Abstract: A control device includes a searching unit increasing or decreasing, at a predetermined step width, an operation voltage or an operation current of a power supply connected to a power converter to search a maximum power point of the power supply, a consecution time determining unit determining whether or not the searching unit has consecutively increased or decreased the operation voltage of the power supply or the operation current thereof, and a step width increasing unit increasing the step width upon determination by the consecution time determining unit that the increase or the decrease has been consecutively executed by a predetermined number of times.Type: GrantFiled: February 3, 2016Date of Patent: October 9, 2018Assignee: Kabushiki Kaisha ToshibaInventors: Koji Maki, Hiroshi Mochikawa, Shingo Yanagimoto
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Publication number: 20180226803Abstract: A control device includes a searching unit increasing or decreasing, at a predetermined step width, an operation voltage or an operation current of a power supply connected to a power converter to search a maximum power point of the power supply, a consecution time determining unit determining whether or not the searching unit has consecutively increased or decreased the operation voltage of the power supply or the operation current thereof, and a step width increasing unit increasing the step width upon determination by the consecution time determining unit that the increase or the decrease has been consecutively executed by a predetermined number of times.Type: ApplicationFiled: February 3, 2016Publication date: August 9, 2018Applicant: Kabushiki Kaisha ToshibaInventors: Koji MAKI, Hiroshi MOCHIKAWA, Shingo YANAGIMOTO
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Publication number: 20180041042Abstract: A power supply system of an embodiment has a plurality of power conditioners, an acquisition device, and a search instruction generator. The power conditioners convert a form of electrical power generated by a plurality of electrical generators into a different form of electrical power. The acquisition device acquires a respective information regarding power output from each of the plurality of power conditioners. The search instruction generator generates and outputs an operating point search instruction to one or more power conditioners being lower in a ratio of output power with respect to a reference power by at least a prescribed degree than one or more different power conditioners, wherein the reference power is given, based on the maximum output power or rated power of the corresponding electrical generator, or based on the maximum output power or rated power of the power conditioner.Type: ApplicationFiled: September 9, 2016Publication date: February 8, 2018Applicant: Kabushiki Kaisha ToshibaInventors: Koji MAKI, Hiroshi MOCHIKAWA, Makoto KUMAI, Hiroaki MATSUMOTO, Shingo YANAGIMOTO, Akihiro MATSUI
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Patent number: 7877165Abstract: In a legged mobile robot control system having leg actuators each driving the individual legs and arm actuators each driving the individual arms, an external force acting on the right arm is detected, operation of the right arm actuators is controlled to produces a handshake posture, and operation of the leg actuators is controlled based on the detected external force acting on the right hand during handshaking, thereby improving communication capability by enabling it to shake hands with humans and to maintain a stable posture during the handshaking.Type: GrantFiled: December 9, 2005Date of Patent: January 25, 2011Assignee: Honda Motor Co., Ltd.Inventors: Kenichiro Sugiyama, Taro Yokoyama, Koji Maki, Naohide Ogawa
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Publication number: 20060129278Abstract: In a legged mobile robot control system having leg actuators each driving the individual legs and arm actuators each driving the individual arms, an external force acting on the right arm is detected, operation of the right arm actuators is controlled to produces a handshake posture, and operation of the leg actuators is controlled based on the detected external force acting on the right hand during handshaking, thereby improving communication capability by enabling it to shake hands with humans and to maintain a stable posture during the handshaking.Type: ApplicationFiled: December 9, 2005Publication date: June 15, 2006Inventors: Kenichiro Sugiyama, Taro Yokoyama, Koji Maki, Naohide Ogawa