Patents by Inventor Hiroyuki Yoshikawa

Hiroyuki Yoshikawa 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: 10141878
    Abstract: A controller for a sensorless permanent magnet synchronous motor having a rotor using a permanent magnet, the rotor rotating by a rotating magnetic field caused by a current flowing through an armature is provided. The controller is configured to apply a pulse voltage for generating a magnetic field vector for searching for the initial position to each of search sections obtained by dividing a target range, narrow down a target range in such a manner that a search section in which a largest amount of current flows through the armature by application of the pulse voltage is selected as a subsequent target range, and repeat the application processing and the narrow-down processing to estimate the initial position.
    Type: Grant
    Filed: November 15, 2017
    Date of Patent: November 27, 2018
    Assignee: KONICA MINOLTA, INC.
    Inventors: Daichi Suzuki, Yuta Tachibana, Hiroyuki Yoshikawa, Yasuhiro Koide
  • Patent number: 10141877
    Abstract: A method for controlling a permanent magnet synchronous motor having a rotor using a permanent magnet, the rotor rotating by a rotating magnetic field caused by a current flowing through an armature is provided. The method includes: presuming, based on a target speed and an estimated speed that is an estimated value of a rotational speed of the rotor, whether or not a step-out occurs; correcting, when it is presumed that a step-out occurs, an estimated angle that is an estimated value of a position of magnetic poles of the rotor; and controlling, based on a post-correction estimated angle that is the estimated angle after the correction, a current flowing through the armature to cause the rotating magnetic field rotating at the target speed.
    Type: Grant
    Filed: October 16, 2017
    Date of Patent: November 27, 2018
    Assignee: Konica Minolta, Inc.
    Inventors: Yasuhiro Koide, Yuta Tachibana, Daichi Suzuki, Hiroyuki Yoshikawa
  • Patent number: 10128027
    Abstract: There is provided an electric wire holder for holding electric wires connected to terminal fittings at end portions of the wires, the holder configured to attach to a shielding pipe to cover an edge of the shielding pipe into which the electric wires are inserted and from which the terminal fittings and a portion of the electric wires are drawn out to an outside of the shielding pipe, the holder comprising: a first holding piece configured to hold the portion of the electric wires that is drawn out from the shielding pipe and to fix a draw-out position of the terminal fittings.
    Type: Grant
    Filed: November 3, 2016
    Date of Patent: November 13, 2018
    Assignee: SUMITOMO WIRING SYSTEMS, Ltd.
    Inventors: Hirokazu Nakai, Masashi Fujiki, Hiroyuki Yoshikawa
  • Publication number: 20180234037
    Abstract: A motor controller includes: a velocity calculation unit for obtaining an angle ?(n), which shows a rotation position, and an angular velocity ?(n) of a rotor at a time point n; a compensation amount calculation unit for calculating a compensation angle ?? by which the rotor advances from the time point n to a (n+1)th control cycle (a control cycle starting from a time point n+1), based on an angular acceleration a(n) of the rotor, an angular velocity ?(n) of the rotor at the time point n and a time length T of the control cycle; and a PWM inverter for controlling a voltage to be applied to a coil such that a rotating magnetic field based on a rotation position of the rotor advanced by the compensation angle ?? from the rotation position of the rotor at the time point n is formed in the (n+1)th control cycle.
    Type: Application
    Filed: February 5, 2018
    Publication date: August 16, 2018
    Inventors: Daichi SUZUKI, Yuta TACHIBANA, Hiroyuki YOSHIKAWA, Yasuhiro KOIDE
  • Publication number: 20180167009
    Abstract: A controller for a sensorless permanent magnet synchronous motor having a rotor using a permanent magnet, the rotor rotating by a rotating magnetic field, caused by a current flowing through an armature is provided. The controller is configured to apply a pulse voltage for generating a magnetic field vector for searching for the initial position to each of search sections obtained by dividing a target range, narrow down a target range in such a manner that a search section in which a largest amount of current flows through the armature by application of the pulse voltage is selected as a subsequent target range, and repeat the application processing and the narrow-down processing to estimate the initial position.
    Type: Application
    Filed: November 15, 2017
    Publication date: June 14, 2018
    Applicant: KONICA MINOLTA, INC.
    Inventors: Daichi SUZUKI, Yuta TACHIBANA, Hiroyuki YOSHIKAWA, Yasuhiro KOIDE
  • Publication number: 20180123492
    Abstract: A method for controlling a permanent magnet synchronous motor having a rotor using a permanent magnet, the rotor rotating by a rotating magnetic field caused by a current flowing through an armature is provided. The method includes: presuming, based on a target speed and an estimated speed that is an estimated value of a rotational speed of the rotor, whether or not a step-out occurs; correcting, when it is presumed that a step-out occurs, an estimated angle that is an estimated value of a position of magnetic poles of the rotor; and controlling, based on a post-correction estimated angle that is the estimated angle after the correction, a current flowing through the armature to cause the rotating magnetic field rotating at the target speed.
    Type: Application
    Filed: October 16, 2017
    Publication date: May 3, 2018
    Applicant: KONICA MINOLTA, INC.
    Inventors: Yasuhiro KOIDE, Yuta TACHIBANA, Daichi SUZUKI, Hiroyuki YOSHIKAWA
  • Patent number: 9929686
    Abstract: A controller for a permanent magnet synchronous motor includes an estimating portion configured to determine an estimated value of a rotational speed of the rotor and an estimated value of a position of magnetic poles of the rotor based on a value of the current detected by the current detector and a parameter value indicating an interlinkage magnetic flux caused by the permanent magnet across the winding; a control unit configured to control the drive portion to cause the rotating magnetic field based on the estimated value of the rotational speed and the estimated value of the position of the magnetic poles; and a correction portion configured to correct the parameter value indicating the interlinkage magnetic flux based on correction information, the correction information being determined based on a temperature of the winding and a relationship between the temperature of the winding and a temperature of the permanent magnet.
    Type: Grant
    Filed: July 12, 2017
    Date of Patent: March 27, 2018
    Assignee: Konica Minolta, Inc.
    Inventors: Daichi Suzuki, Yuta Tachibana, Hiroyuki Yoshikawa, Yasuhiro Koide
  • Patent number: 9912786
    Abstract: A demodulation section demodulates a received signal. A decoding section decodes an output from the demodulation section. A buffer temporarily stores a portion of the received signal. A header analyzing section gives the buffer timing at which demodulation and decoding of a payload of the received signal are initiated, on the basis of a result of combination of a plurality of header sequences included in a header of the received signal and results of processing of the demodulation section and the decoding section. An improved SNR is achieved by means of combination of the plurality of header sequences, so that an iterative decoding count used for decoding the header become smaller.
    Type: Grant
    Filed: February 27, 2013
    Date of Patent: March 6, 2018
    Assignee: PANASONIC CORPORATION
    Inventors: Naoya Yosoku, Hiroyuki Yoshikawa, Naganori Shirakata
  • Publication number: 20180019693
    Abstract: A controller for a permanent magnet synchronous motor includes an estimating portion configured to determine an estimated value of a rotational speed of the rotor and an estimated value of a position of magnetic poles of the rotor based on a value of the current detected by the current detector and a parameter value indicating an interlinkage magnetic flux caused by the permanent magnet across the winding; a control unit configured to control the drive portion to cause the rotating magnetic field based on the estimated value of the rotational speed and the estimated value of the position of the magnetic poles; and a correction portion configured to correct the parameter value indicating the interlinkage magnetic flux based on correction information, the correction information being determined based on a temperature of the winding and a relationship between the temperature of the winding and a temperature of the permanent magnet.
    Type: Application
    Filed: July 12, 2017
    Publication date: January 18, 2018
    Applicant: Konica Minolta, Inc.
    Inventors: Daichi SUZUKI, Yuta TACHIBANA, Hiroyuki YOSHIKAWA, Yasuhiro KOIDE
  • Publication number: 20180019700
    Abstract: A controller for a permanent magnet synchronous motor includes an estimating portion configured to determine an estimated value of a rotational speed of the rotor and an estimated value of a position of magnetic poles of the rotor based on a value of the current detected by the current detector and a parameter value indicating an interlinkage magnetic flux caused by the permanent magnet across the winding; a control unit configured to control the drive portion to cause the rotating magnetic field based on the estimated value of the rotational speed and the estimated value of the position of the magnetic poles; and a correction portion configured to correct the parameter value indicating the interlinkage magnetic flux based on correction information, the correction information being determined based on a temperature of the winding and a relationship between the temperature of the winding and a temperature of the permanent magnet.
    Type: Application
    Filed: June 28, 2017
    Publication date: January 18, 2018
    Applicant: Konica Minolta, Inc.
    Inventors: Daichi SUZUKI, Yuta TACHIBANA, Hiroyuki YOSHIKAWA, Yasuhiro KOIDE
  • Patent number: 9838036
    Abstract: A storage which, in operation, stores a first minimum value and a second minimum value each time a plurality of data are input. Round-robin comparison circuitry which, in operation, makes a magnitude comparison among the plurality of data. First selection comparison circuitry and second selection comparison circuitry which, in operation, make a magnitude comparison between the first minimum value and each of the plurality of data and a magnitude comparison between the second minimum value and each of the plurality of data, respectively. Judgment circuitry which, in operation, judges a new first minimum value and a new second minimum value on the basis of a comparison result from the round-robin comparison circuitry and comparison results from the first and second selection comparison circuitry.
    Type: Grant
    Filed: February 1, 2016
    Date of Patent: December 5, 2017
    Assignee: PANASONIC CORPORATION
    Inventors: Hiroyuki Motozuka, Hiroyuki Yoshikawa
  • Patent number: 9671711
    Abstract: An image forming apparatus includes: a plurality of image forming units forming an image in the corresponding color by electrophotographic system; a high-voltage power supply circuit capable of generating a bias voltage; and a control unit that controls a first printing mode and a second printing mode, wherein in the second printing mode, the control unit performs such control that the photosensitive bodies provided on the image forming units not used in the second printing mode continuously rotate at a speed lower than a speed in the first printing mode, and/or such control that a bias voltage whose absolute value is less than an absolute value of a bias voltage in the first printing mode is supplied from the high-voltage power supply circuit to the processing components of the same type provided on the image forming units not used in the second printing mode.
    Type: Grant
    Filed: November 4, 2015
    Date of Patent: June 6, 2017
    Assignee: KONICA MINOLTA, INC.
    Inventors: Makoto Shimazoe, Akihiro Hayashi, Hiroyuki Yoshikawa, Toshikazu Higashi
  • Publication number: 20170076841
    Abstract: There is provided an electric wire holder for holding electric wires connected to terminal fittings at end portions of the wires, the holder configured to attach to a shielding pipe to cover an edge of the shielding pipe into which the electric wires are inserted and from which the terminal fittings and a portion of the electric wires are drawn out to an outside of the shielding pipe, the holder comprising: a first holding piece configured to hold the portion of the electric wires that is drawn out from the shielding pipe and to fix a draw-out position of the terminal fittings.
    Type: Application
    Filed: November 3, 2016
    Publication date: March 16, 2017
    Applicant: SUMITOMO WIRING SYSTEMS, LTD.
    Inventors: Hirokazu NAKAI, Masashi FUJIKI, Hiroyuki YOSHIKAWA
  • Patent number: 9537510
    Abstract: A variable shifter includes: a plurality of shifters that cyclically shift input data having a plurality of bits or cyclically shifted data; and a control unit that selects a shift amount for each of the plurality of shifters in accordance with a predetermined cyclic shift amount. The number of types of the predetermined cyclic shift amount is smaller than the number of bits in the input data, each shifter selects one of a plurality of shift amounts in accordance with the predetermined cyclic shift amount, and the plurality of shift amounts have a combination of shift amounts that differ from one shifter to another.
    Type: Grant
    Filed: February 2, 2015
    Date of Patent: January 3, 2017
    Assignee: Panasonic Intellectual Property Managament Co., Ltd.
    Inventors: Hiroyuki Motozuka, Hiroyuki Yoshikawa
  • Patent number: 9533850
    Abstract: An image forming apparatus includes a conveyance sensor disposed near a pair of conveyance rollers so as to accurately detect an amount of movement of the recording paper, a conveyance delay determination unit to determine a conveyance delay of the recording paper, and a conveyance control unit to control drive for rollers. The conveyance delay determination unit obtains conveyance delay information from among information detected with the conveyance sensor, or the like, and accelerates a rotational velocity of the pair of paper feed rollers when the conveyance delay quantity exceeds a threshold.
    Type: Grant
    Filed: April 15, 2015
    Date of Patent: January 3, 2017
    Assignee: KONICA MINOLTA, INC.
    Inventors: Hiroyuki Yoshikawa, Yuta Tachibana, Takaki Kato, Daichi Suzuki
  • Patent number: 9520214
    Abstract: There is provided an electric wire holder for holding electric wires connected to terminal fittings at end portions of the wires, the holder configured to attach to a shielding pipe to cover an edge of the shielding pipe into which the electric wires are inserted and from which the terminal fittings and a portion of the electric wires are drawn out to an outside of the shielding pipe, the holder comprising: a first holding piece configured to hold the portion of the electric wires that is drawn out from the shielding pipe and to fix a draw-out position of the terminal fittings.
    Type: Grant
    Filed: August 8, 2014
    Date of Patent: December 13, 2016
    Assignee: SUMITOMO WIRING SYSTEMS, LTD.
    Inventors: Hirokazu Nakai, Masashi Fujiki, Hiroyuki Yoshikawa
  • Patent number: 9491030
    Abstract: A phase rotation correcting method includes receiving a signal modulated by a multi-value modulation method; recognizing a position of a symbol point of the received signal on an IQ plane; performing phase rotation for rotating a phase of the symbol point of the received signal toward an I axis or a Q axis in accordance with the recognized position and calculating, as an amount of phase rotation correction, a value on an axis different from the axis toward which the phase of the symbol point has been rotated by the phase rotation; and correcting phase rotation of the symbol point by using the calculated amount of phase rotation correction.
    Type: Grant
    Filed: January 28, 2015
    Date of Patent: November 8, 2016
    Assignee: Panasonic Corporation
    Inventors: Hiroyuki Yoshikawa, Yoshinori Shirakawa, Takenori Sakamoto, Koichiro Tanaka
  • Publication number: 20160305889
    Abstract: The present invention provide a method for detecting a test substance utilizing a color development caused by an enzyme reaction, or a color development caused by a specific interaction such as an antigen-antibody reaction and an enzyme reaction, the test substance being detected rapidly, sensitively and quantitatively without using a spectroscopic measurement device. The method for measuring a concentration of a test substance by the present invention comprises the steps of: generating a peroxide from the test substance; obtaining a polymerized substance by bringing an oxidoreductase for producing a polymerized substance and a substrate of the oxidoreductase for producing a polymerized substance into contact with the peroxide; and irradiating the polymerized substance with light to record a temporal variation information of an intensity of scattered light generated from an irradiation point.
    Type: Application
    Filed: October 20, 2014
    Publication date: October 20, 2016
    Applicant: OSAKA UNIVERSITY
    Inventors: Hiroyuki YOSHIKAWA, Eiichi TAMIYA, Shuhei IMURA
  • Publication number: 20160241360
    Abstract: A storage which, in operation, stores a first minimum value and a second minimum value each time a plurality of data are input. Round-robin comparison circuitry which, in operation, makes a magnitude comparison among the plurality of data. First selection comparison circuitry and second selection comparison circuitry which, in operation, make a magnitude comparison between the first minimum value and each of the plurality of data and a magnitude comparison between the second minimum value and each of the plurality of data, respectively. Judgment circuitry which, in operation, judges a new first minimum value and a new second minimum value on the basis of a comparison result from the round-robin comparison circuitry and comparison results from the first and second selection comparison circuitry.
    Type: Application
    Filed: February 1, 2016
    Publication date: August 18, 2016
    Inventors: HIROYUKI MOTOZUKA, HIROYUKI YOSHIKAWA
  • Publication number: 20160139531
    Abstract: An image forming apparatus includes: a plurality of image forming units forming an image in the corresponding color by electrophotographic system; a high-voltage power supply circuit capable of generating a bias voltage; and a control unit that controls a first printing mode and a second printing mode, wherein in the second printing mode, the control unit performs such control that the photosensitive bodies provided on the image forming units not used in the second printing mode continuously rotate at a speed lower than a speed in the first printing mode, and/or such control that a bias voltage whose absolute value is less than an absolute value of a bias voltage in the first printing mode is supplied from the high-voltage power supply circuit to the processing components of the same type provided on the image forming units not used in the second printing mode.
    Type: Application
    Filed: November 4, 2015
    Publication date: May 19, 2016
    Applicant: Konica Minolta, Inc.
    Inventors: Makoto SHIMAZOE, Akihiro HAYASHI, Hiroyuki YOSHIKAWA, Toshikazu HIGASHI