Patents by Inventor Wataru Hatsuse

Wataru Hatsuse 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).

  • Publication number: 20200373866
    Abstract: Controllability of a linear motor or a compressor is improved in a linear motor system that includes: an armature having magnetic poles and winding wires; a mover having a permanent magnet; and a power conversion unit that outputs AC power to the winding wires, in which the mover and the armature are relatively movable, and the mover or the armature is connected to an elastic body. The linear motor system further includes: a position detection unit that detects and outputs the position of the mover with respect to the armature, a position estimation, or a current detection unit that outputs the value of current flowing through the winding wires; and a control unit that controls the output of the power conversion unit on the basis of the output of the position detection unit, the output of the position estimation unit, or the output of the current detection unit.
    Type: Application
    Filed: August 13, 2020
    Publication date: November 26, 2020
    Inventors: Takahiro SUZUKI, Shuhei NAGATA, Wataru HATSUSE, Masaki KOYAMA
  • Patent number: 10784809
    Abstract: Controllability of a linear motor or a compressor is improved. There is provided a linear motor system that includes: an armature having magnetic poles and winding wires; a mover having a permanent magnet; and a power conversion unit that outputs AC power to the winding wires, in which the mover and the armature are relatively movable, and the mover or the armature is connected to an elastic body. The linear motor system further includes: a position detection unit that detects and outputs the position of the mover with respect to the armature, a position estimation, or a current detection unit that outputs the value of current flowing through the winding wires; and a control unit that controls the output of the power conversion unit on the basis of the output of the position detection unit, the output of the position estimation unit, or the output of the current detection unit.
    Type: Grant
    Filed: April 11, 2017
    Date of Patent: September 22, 2020
    Assignee: Hitachi, Ltd.
    Inventors: Takahiro Suzuki, Shuhei Nagata, Wataru Hatsuse, Masaki Koyama
  • Publication number: 20200195119
    Abstract: Provided is a linear motor control apparatus capable of improving estimation accuracy of a resonance frequency immediately after start, and a compressor equipped with the linear motor control apparatus. A linear motor control apparatus includes a winding to which an AC voltage is applied and a mover which is connected to an elastic body, in which the linear motor control apparatus includes an operation mode (1) which monotonously increases amplitude of the AC voltage while keeping a frequency of the AC voltage substantially constant, and an operation mode (2) which changes the frequency of the AC voltage while keeping the amplitude of the AC voltage substantially constant, and executes the operation mode (1) and the operation mode (2) in this order.
    Type: Application
    Filed: October 5, 2017
    Publication date: June 18, 2020
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Takahiro SUZUKI, Shuhei NAGATA, Wataru HATSUSE, Masaki KOYAMA
  • Patent number: 10608570
    Abstract: A boosting operation of a converter and the intermittent energization operation of an inverter are optimally performed in accordant with input or output. The power converter includes the converter capable of boosting a DC voltage outputted by switching operation alternately performing shorting and rectification; the inverter; an inverter capable of performing intermittent energization in which switching around zero cross of a motor current is turned off upon converting the DC voltage outputted by the converter into three-phase AC power; and a controller that controls the converter to perform boosting operation and the inverter to perform the boosting operation of the converter and the intermittent energization operation of the inverter linkingly.
    Type: Grant
    Filed: October 18, 2017
    Date of Patent: March 31, 2020
    Assignee: Hitachi-Johnson Controls Air Conditioning, Inc.
    Inventors: Yoji Ogura, Kazuhiro Ueta, Kenji Tamura, Wataru Hatsuse
  • Publication number: 20190238066
    Abstract: Provided are a power conversion device and a system using the same, which can reduce loss of each semiconductor element in a power conversion circuit and enable high efficiency of a device controlled by the power conversion device. The power conversion device includes a direct current (DC) power source; and a full-bridge circuit having first upper and lower arms having an upper element and a lower element and second upper and lower arms having an upper element and a lower element, in which the first upper and lower arms and the second upper and lower arms are electrically connectable to a device, and ON resistances of the upper element of the first upper and lower arms and the lower element of the second upper and lower arms are smaller than ON resistances of the lower element of the first upper and lower arms and the upper element of the second upper and lower arms.
    Type: Application
    Filed: September 29, 2017
    Publication date: August 1, 2019
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Wataru HATSUSE, Masaki KOYAMA, Shuhei NAGATA, Takahiro SUZUKI
  • Publication number: 20190170130
    Abstract: Controllability of a linear motor or a compressor is improved. There is provided a linear motor system that includes: an armature having magnetic poles and winding wires; a mover having a permanent magnet; and a power conversion unit that outputs AC power to the winding wires, in which the mover and the armature are relatively movable, and the mover or the armature is connected to an elastic body. The linear motor system further includes: a position detection unit that detects and outputs the position of the mover with respect to the armature, a position estimation, or a current detection unit that outputs the value of current flowing through the winding wires; and a control unit that controls the output of the power conversion unit on the basis of the output of the position detection unit, the output of the position estimation unit, or the output of the current detection unit.
    Type: Application
    Filed: April 11, 2017
    Publication date: June 6, 2019
    Applicant: Hitachi, Ltd.
    Inventors: Takahiro SUZUKI, Shuhei NAGATA, Wataru HATSUSE, Masaki KOYAMA
  • Publication number: 20190115861
    Abstract: A boosting operation of a converter and the intermittent energization operation of an inverter are optimally performed in accordant with input or output. The power converter includes the converter capable of boosting a DC voltage outputted by switching operation alternately performing shorting and rectification; the inverter; an inverter capable of performing intermittent energization in which switching around zero cross of a motor current is turned off upon converting the DC voltage outputted by the converter into three-phase AC power; and a controller that controls the converter to perform boosting operation and the inverter to perform the boosting operation of the converter and the intermittent energization operation of the inverter linkingly.
    Type: Application
    Filed: October 18, 2017
    Publication date: April 18, 2019
    Inventors: Yoji OGURA, Kazuhiro UETA, Kenji TAMURA, Wataru HATSUSE
  • Patent number: 9748887
    Abstract: A permanent magnet synchronous motor includes at least two series-connected windings for each phase, and is configured to be driven by selecting the windings using a multi-inverter driving device configured to switch between an inverter for low-speed drive and an inverter for high-speed drive. A ratio of an induced voltage constant of at least one group of windings constituting the windings for the high-speed drive and a d-axis inductance is larger than a ratio of an induced voltage constant of all the series-connected windings to the d-axis inductance.
    Type: Grant
    Filed: December 15, 2015
    Date of Patent: August 29, 2017
    Assignee: Hitachi, Ltd.
    Inventors: Yasuo Notohara, Eri Maruyama, Wataru Hatsuse, Ryouichi Takahata
  • Publication number: 20160204728
    Abstract: A permanent magnet synchronous motor includes at least two series-connected windings for each phase, and is configured to be driven by selecting the windings using a multi-inverter driving device configured to switch between an inverter for low-speed drive and an inverter for high-speed drive. A ratio of an induced voltage constant of at least one group of windings constituting the windings for the high-speed drive and a d-axis inductance is larger than a ratio of an induced voltage constant of all the series-connected windings to the d-axis inductance.
    Type: Application
    Filed: December 15, 2015
    Publication date: July 14, 2016
    Inventors: Yasuo NOTOHARA, Eri MARUYAMA, Wataru HATSUSE, Ryouichi TAKAHATA
  • Patent number: 8344671
    Abstract: The invention relates to a speed control method of a magnetic motor and is capable of providing a speed controller of the magnetic motor realizing highly stable, highly efficient and highly responsive control characteristics even around critical torque of the motor. When an excessive torque command value (or a q-axis commanded current value) greater than a torque maximum value (or a q-axis current) that can be outputted by the motor is required, an input of speed control is limited so that the q-axis commanded current value does not increase up to a limit value.
    Type: Grant
    Filed: December 11, 2009
    Date of Patent: January 1, 2013
    Assignee: Hitachi Industrial Equipment Systems Co., Ltd.
    Inventors: Kazuaki Tobari, Yasuo Notohara, Wataru Hatsuse, Dongsheng Li, Kentaro Oi, Yuuji Funayama
  • Publication number: 20100148707
    Abstract: The invention relates to a speed control method of a magnetic motor and is capable of providing a speed controller of the magnetic motor realizing highly stable, highly efficient and highly responsive control characteristics even around critical torque of the motor. When an excessive torque command value (or a q-axis commanded current value) greater than a torque maximum value (or a q-axis current) that can be outputted by the motor is required, an input of speed control is limited so that the q-axis commanded current value does not increase up to a limit value.
    Type: Application
    Filed: December 11, 2009
    Publication date: June 17, 2010
    Inventors: Kazuaki TOBARI, Yasuo Notohara, Wataru Hatsuse, Dongsheng Li, Kentaro Oi, Yuuji Funayama