Patents by Inventor Hiroaki Kawai

Hiroaki Kawai 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: 11121697
    Abstract: A quartz crystal resonator that includes an AT-cut quartz crystal blank that is plate-shaped and that is rectangular when viewed in a direction normal to a main surface thereof; and a first outer electrode and a second outer electrode disposed on the main surface and arranged in a short-side direction of the main surface. Long sides of the main surface are substantially parallel to a Z? axis of the quartz crystal blank. The short sides of the main surface are substantially parallel to an X axis of the quartz crystal blank. A frequency of a main vibration of the quartz crystal blank is in a range of 20.0 MHz to 60.0 MHz, and 0.050?P??0.0047×F+1.728, where P (mm) is a distance between the first outer electrode and the second outer electrode in the short-side direction, and F (MHz) is the frequency of the main vibration.
    Type: Grant
    Filed: December 28, 2017
    Date of Patent: September 14, 2021
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventors: Ryuichi Kawai, Hiroyuki Yamamoto, Hiroaki Kaida
  • Publication number: 20210270966
    Abstract: An object detecting device is configured of a laser beam generating unit that generates a laser beam, a light receiving unit that outputs a received light signal based on a laser beam reflected from a detection target object, a distance calculating unit that calculates a distance to the detection target object based on a time required from an emission of the laser beam until a reception of the received light signal, and a wave height value calculating unit that obtains an approximate straight line based on inclinations of a rise and a fall of a waveform of the received light signal at a set threshold, and calculates a wave height value of the received light signal based on the approximate straight line, wherein information regarding the detection target object is collected based on the wave height value, in addition to the distance being calculated.
    Type: Application
    Filed: October 20, 2020
    Publication date: September 2, 2021
    Applicant: Mitsubishi Electric Corporation
    Inventors: Hiroaki Inoue, Masahiro Kawai, Shohei Tsukamoto, Masaharu Imaki
  • Patent number: 11001481
    Abstract: An output-torque estimation unit obtains a value of a current input to a motor, from a power converter, and calculates an estimated output torque value which is an estimated value of output torque of the motor, from the obtained value of the current. A load estimation unit estimates a load value of a hanging cargo based on the estimated output torque value which is calculated by the output-torque estimation unit, a speed reduction ratio of a speed reducer, an effective radius of a winch drum, and the winding number which is set by the number setting unit.
    Type: Grant
    Filed: June 5, 2017
    Date of Patent: May 11, 2021
    Assignees: Kobe Steel, Ltd., KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Hiroaki Kawai, Takashi Hiekata, Koji Inoue, Takashi Tokuyama, Hiroshi Hashimoto, Toshiaki Shimoda, Shintaroh Sasai, Tetsuya Ogawa, Toshiro Yamashita
  • Publication number: 20210123213
    Abstract: A hydraulic drive apparatus capable of automatic control with high accuracy regardless of regeneration operation includes a boom flow rate control valve, an arm flow rate control valve, a regeneration control valve, a pump control device for performing horsepower control, a posture detection device, a boom flow rate control device switchable between a normal control mode and an automatic control mode, and a regeneration control device. The boom flow rate control device adjusts the boom flow rate in the automatic control mode so that a work attachment moves along a target locus. The regeneration control device sets the regeneration control valve to a regeneration position in a low load situation and to a regeneration cut position in a high load situation, and lowers the regeneration rate in the low load situation when the boom flow rate control device is switched to the automatic control mode.
    Type: Application
    Filed: April 22, 2019
    Publication date: April 29, 2021
    Applicants: KABUSHIKI KAISHA KOBE SEIKO SHO (Kobe Steel, Ltd.), KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Satoshi MAEKAWA, Hiroaki KAWAI, Yusuke KAMIMURA
  • Patent number: 10826423
    Abstract: A motor driving apparatus includes a first driving control circuit (an MCU, a driving circuit, an input circuit, a power management IC) and a second driving control circuit (an MCU, a driving circuit, an input circuit, a power management IC). The first driving control circuit and the second driving control circuit are configured to drive a corresponding winding group of winding groups of a motor, and have a master mode for outputting a synchronous trigger signal in synchronization with driving of the corresponding winding group and a slave mode for synchronizing the driving of the corresponding winding group with an input synchronous trigger signal. When an error has occurred in an operation of the first driving control circuit in the master mode, the second driving control circuit switches an operation mode of the second driving control circuit from the slave mode to the master mode.
    Type: Grant
    Filed: April 4, 2019
    Date of Patent: November 3, 2020
    Assignee: RENESAS ELECTRONICS CORPORATION
    Inventors: Hiroaki Kawai, Shunsuke Nakano
  • Publication number: 20190326843
    Abstract: A motor driving apparatus includes a first driving control circuit (an MCU, a driving circuit, an input circuit, a power management IC) and a second driving control circuit (an MCU, a driving circuit, an input circuit, a power management IC). The first driving control circuit and the second driving control circuit are configured to drive a corresponding winding group of winding groups of a motor, and have a master mode for outputting a synchronous trigger signal in synchronization with driving of the corresponding winding group and a slave mode for synchronizing the driving of the corresponding winding group with an input synchronous trigger signal. When an error has occurred in an operation of the first driving control circuit in the master mode, the second driving control circuit switches an operation mode of the second driving control circuit from the slave mode to the master mode.
    Type: Application
    Filed: April 4, 2019
    Publication date: October 24, 2019
    Inventors: Hiroaki KAWAI, Shunsuke NAKANO
  • Publication number: 20190300339
    Abstract: An output-torque estimation unit obtains a value of a current input to a motor, from a power converter, and calculates an estimated output torque value which is an estimated value of output torque of the motor, from the obtained value of the current. A load estimation unit estimates a load value of a hanging cargo based on the estimated output torque value which is calculated by the output-torque estimation unit, a speed reduction ratio of a speed reducer, an effective radius of a winch drum, and the winding number which is set by the number setting unit.
    Type: Application
    Filed: June 5, 2017
    Publication date: October 3, 2019
    Applicants: KABUSHIKI KAISHA KOBE SEIKO SHO (Kobe Steel, Ltd.), KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Hiroaki KAWAI, Takashi HIEKATA, Koji INOUE, Takashi TOKUYAMA, Hiroshi HASHIMOTO, Toshiaki SHIMODA, Shintaroh SASAI, Tetsuya OGAWA, Toshiro YAMASHITA
  • Patent number: 10399553
    Abstract: An operating switch for commanding actuation of an electric parking brake mechanism includes two input terminals and two output terminals, a pair of two wirings for each input-terminal/output-terminal pair of the two input terminals and the two output terminals, each of the wirings being located between the input terminals and the two output terminals, a first switch element provided for the input terminals or the output terminals, and configured to switch connections to the two wirings, according to a command for the actuation, and a second switch element connected to one wiring of the two wirings that connects the input terminals and the output terminals when the command for the actuation given to the first switch element is set to a mode of non-operation. The second switch element is configured to switch connections to the two output terminals or the two input terminals, according to the command for the actuation.
    Type: Grant
    Filed: August 26, 2016
    Date of Patent: September 3, 2019
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Hiroaki Kawai, Kenichiro Matsubara
  • Patent number: 10399828
    Abstract: An electrically driven winch device includes a winch drum, a plurality of axial-gap electric motors, and a drive shaft. The winch drum rotates around a drum axis in order to wind or unwind a work rope. The plurality of electric motors are electric motors configured to drive the winch drum to rotate, and are each provided with a stator, and rotors which rotate around a rotation axis and are disposed at an axial distance from the stator. The drive shaft is disposed coaxially with the drum axis and serially connects the rotors of the plurality of electric motors on the rotation axis.
    Type: Grant
    Filed: October 7, 2016
    Date of Patent: September 3, 2019
    Assignees: Kobe Steel, Ltd., KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Takashi Hiekata, Koji Inoue, Hiroaki Kawai, Shintaroh Sasai, Tetsuya Ogawa, Toshiro Yamashita
  • Patent number: 10381890
    Abstract: An axial gap type dynamo-electric machine (1) comprises: a stator (2) provided with a magnetic core (21) and an exciting coil (22); a rotor (3) provided with a plurality of permanent magnets (4) circumferentially arranged around a rotation center axis (AX), the rotor (3) being also provided with a disk-shaped base material (31) for supporting the permanent magnets, the rotor (3) being disposed at an axial distance from the stator (2); and affixation members (5) for affixing the permanent magnets (4) to the base material (31). The permanent magnets (4) are provided with front surfaces facing the stator (2), rear surfaces facing the base material, and engagement-receiving sections (412, 422, 432) formed at peripheral edges of the permanent magnets (4). The affixation members (5) include: engagement sections (512) engaging the engagement-receiving sections; and affixation sections (511) forming mechanical affixation structures relative to the base material.
    Type: Grant
    Filed: July 20, 2016
    Date of Patent: August 13, 2019
    Assignee: Kobe Steel, Ltd.
    Inventors: Koji Inoue, Takashi Hiekata, Hiroaki Kawai, Shintaro Sasai, Tetsuya Ogawa, Toshiro Yamashita, Shingo Kasai, Shumpei Hayashi
  • Patent number: 10355570
    Abstract: In the outer rotor-type axial gap brushless motor of the present invention, each of a plurality of coils provided to a stator is constituted by winding a band-shaped conductor member via an insulating member such that the width direction of the conductor member runs along the axial direction of the coil, and each coil has a through passage which penetrates in the axial direction of the coil and which is included between prescribed turns in a portion of the coil that corresponds to the outer side in the radial direction of the stator relative to a core portion of the coil.
    Type: Grant
    Filed: August 20, 2015
    Date of Patent: July 16, 2019
    Assignee: Kobe Steel, Ltd.
    Inventors: Kenichi Inoue, Hiroaki Kawai, Koji Inoue, Takashi Hiekata, Kazuhide Sekiyama
  • Patent number: 10315896
    Abstract: An electric winch device includes a required braking force estimation section which estimates a required braking force required to stop a free-falling object at a position at an allowable stopping height; a braking force determination section which determines, out of an operational braking force, each of a first braking force to be borne by a braking device and a second braking force to be borne by a braking force which is generated in an electric motor due to consumption of regenerative power; and a control section which causes the braking device to apply the first braking force to a winch drum. The braking force determination section determines the first braking force to be a braking force equal to or greater than the required braking force when, at a time of stopping of the free-falling object, the operational braking force is equal to or greater than the required braking force.
    Type: Grant
    Filed: July 10, 2015
    Date of Patent: June 11, 2019
    Assignees: Kobe Steel, Ltd., KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Hiroaki Kawai, Takashi Hiekata, Shintaro Sasai, Naoto Hori, Toshiro Yamashita, Koichi Shimomura
  • Patent number: 10287137
    Abstract: Disclosed is a winch control apparatus for a crane, which comprises: a first compensation torque value calculation section which calculates, when a hoisting manipulation being input, based on a difference speed between a detected rotational speed and a target speed according to a manipulation amount of the hoisting manipulation, a first compensation torque value for enabling an electric motor to generate a reverse-rotation-preventing torque which is a torque in a hoisting direction and corresponding to the difference speed; and a second compensation torque value calculation section which calculates, when the hoisting manipulation being input, based on a detected load value, a second compensation torque value for enabling the electric motor to generate a load bearing torque which is a torque in the hoisting direction and necessary for bearing a load of the load value.
    Type: Grant
    Filed: February 6, 2018
    Date of Patent: May 14, 2019
    Assignees: Kobe Steel, Ltd., KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Hiroaki Kawai, Takashi Tokuyama, Toshiaki Shimoda, Koji Inoue, Tetsuya Ogawa, Shintaroh Sasai
  • Patent number: 10264359
    Abstract: In a speaker damper, art sections are disposed on warp reference lines and warp reference lines. Straight sections are disposed so as to intersect intermediate reference lines at right angles. By adopting this configuration, wave parts can be adjusted so that they are less likely to expand/contract on the warp reference lines and the warp reference lines in comparison with related-art concentric circular wave parts. Further, the wave parts can be adjusted so that they are more likely to expand/contract on the intermediate reference lines. In this way, the speaker damper can perform uniform vibrating motions throughout the entire speaker damper with a simple configuration.
    Type: Grant
    Filed: March 6, 2017
    Date of Patent: April 16, 2019
    Assignee: JVC KENWOOD CORPORATION
    Inventors: Hiroaki Kawai, Akira Shigeta, Satoshi Tomizawa
  • Patent number: 10196247
    Abstract: Provided is an electric winch device including: an electric motor; a winch drum; a brake; an operation lever; and a controller. The controller includes: a first torque derivation unit which derives a value of a first torque applied to the winch drum due to a load of an object; a second torque derivation unit which derives a value of a second torque generated in the winch drum by a drive torque of the electric motor; and a brake control unit which determines a timing for releasing a braking action on the winch drum after the operation lever has been operated, on the basis of a differential between the second torque value and the first torque value, and which causes the brake to release the braking action on the winch drum by transmitting, to the brake, a control signal instructing release of the braking action on the winch drum at the determined timing.
    Type: Grant
    Filed: November 6, 2014
    Date of Patent: February 5, 2019
    Assignees: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.), KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Takashi Hiekata, Hiroaki Kawai, Toshiro Yamashita, Shintaro Sasai, Naoto Hori, Koichi Shimomura
  • Patent number: 10189687
    Abstract: An electric winch device causes an operative part to perform an operation for hoisting work by winding up or letting out a rope connected to the operative part, the electric winch device including: a winch drum having an axis, provided on the mobile crane to be rotatable about the axis and wound with the rope therearound; a plurality of motors located on one side of the winch drum in an axial direction in which the axis of the winch drum extends, and arranged side by side in a direction perpendicular to the axial direction; a gear mechanism which combines torques output from the plurality of motors; and a transmitting part which transmits a resultant of torques combined by the gear mechanism to the winch drum to rotate the winch drum to thereby cause the winch drum to wind up or let out the rope.
    Type: Grant
    Filed: November 27, 2015
    Date of Patent: January 29, 2019
    Assignees: Kobe Steel, Ltd., KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Takashi Hiekata, Hiroaki Kawai, Koji Inoue, Shintaro Sasai, Tetsuya Ogawa, Toshiro Yamashita
  • Patent number: 10150655
    Abstract: An electric winch device including an electric motor that rotates a winch drum in a hoisting direction, and generates regenerative electric power when a rotation of the winch drum in a lowering direction is transmitted to the electric motor, a transmission device that transmits the rotation between the electric motor and the winch drum, a power calculating section that calculates power of the target object by freefall, and a control section that controls an operation of the transmission device. When the power calculated by the power calculating section exceeds reference electric power, the control section causes the transmission device to change the transmission rate of the rotation to a transmission rate at which the regenerative electric power generated by the electric motor is equal to or smaller than the reference electric power.
    Type: Grant
    Filed: April 7, 2015
    Date of Patent: December 11, 2018
    Assignees: Kobe Steel, Ltd., KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Takashi Hiekata, Hiroaki Kawai, Toshiro Yamashita, Shintaro Sasai, Naoto Hori, Koichi Shimomura
  • Publication number: 20180319635
    Abstract: An electrically driven winch device includes a winch drum, a plurality of axial-gap electric motors, and a drive shaft. The winch drum rotates around a drum axis in order to wind or unwind a work rope. The plurality of electric motors are electric motors configured to drive the winch drum to rotate, and are each provided with a stator, and rotors which rotate around a rotation axis and are disposed at an axial distance from the stator. The drive shaft is disposed coaxially with the drum axis and serially connects the rotors of the plurality of electric motors on the rotation axis.
    Type: Application
    Filed: October 7, 2016
    Publication date: November 8, 2018
    Applicants: KABUSHIKI KAISHA KOBE SEIKO SHO (Kobe Steel, Ltd.), KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Takashi HIEKATA, Koji INOUE, Hiroaki KAWAI, Shintaroh SASAI, Tetsuya OGAWA, Toshiro YAMASHITA
  • Patent number: 10087057
    Abstract: Provided is a braking apparatus for braking of an electric winch of a construction machine, ensuring safe braking with much regeneration. The apparatus includes a regenerative-power generation unit, a regenerative-power receiving unit, a braking device for mechanical braking separately from the regenerative-power generation unit, and a braking control unit including a necessary-braking-capacity calculation section, a regeneration-capacity calculation section calculating a regeneration capacity, and a command section. The command section, when the regeneration capacity is not less than a necessary braking capacity, performs braking with only a regenerative action while not operating the braking device and, when the regeneration capacity is less than the necessary braking capacity, calculates an auxiliary braking force equivalent to a difference between the necessary braking capacity and the regeneration capacity and brings the braking device into braking action with the auxiliary braking force.
    Type: Grant
    Filed: August 18, 2016
    Date of Patent: October 2, 2018
    Assignees: Kobe Steel, Ltd., KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Hiroaki Kawai, Takashi Hiekata, Shintaro Sasai, Toshiro Yamashita
  • Publication number: 20180244255
    Abstract: An operating switch for commanding actuation of an electric parking brake mechanism includes two input terminals and two output terminals, a pair of two wirings for each input-terminal/output-terminal pair of the two input terminals and the two output terminals, each of the wirings being located between the input terminals and the two output terminals, a first switch element provided for the input terminals or the output terminals, and configured to switch connections to the two wirings, according to a command for the actuation, and a second switch element connected to one wiring of the two wirings that connects the input terminals and the output terminals when the command for the actuation given to the first switch element is set to a mode of non-operation. The second switch element is configured to switch connections to the two output terminals or the two input terminals, according to the command for the actuation.
    Type: Application
    Filed: August 26, 2016
    Publication date: August 30, 2018
    Inventors: Hiroaki KAWAI, Kenichiro MATSUBARA