Patents by Inventor Mitsuhiro Sakamoto

Mitsuhiro Sakamoto 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: 20210234493
    Abstract: A motor device includes a motor and a processing unit to control the motor. The processing unit transmits a current signal to a controller, which is electrically connected to the motor, by causing a current to flow through windings of the motor.
    Type: Application
    Filed: June 21, 2019
    Publication date: July 29, 2021
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Shinsuke Kimura, Mitsuhiro Sakamoto
  • Publication number: 20210140441
    Abstract: A motor device includes a motor, an input unit, a processing unit, and an electrical energy storage unit. The input unit accepts power supplied from a controller during a first period and receives at least a communication signal transmitted from the controller during a second period after the first period. The processing unit updates data for the motor in accordance with the communication signal received by the input unit. The electrical energy storage unit stores, based on the power supplied to the input unit, electrical energy for driving the processing unit.
    Type: Application
    Filed: June 24, 2019
    Publication date: May 13, 2021
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Mitsuhiro Sakamoto, Shinsuke Kimura, Yasuyuki Yokouchi
  • Patent number: 10469013
    Abstract: A motor control device at least includes a speed control part for controlling a motor rotation speed. The motor control device includes a torque correction means for suppressing variation in torque constant due to individual differences of motors. In addition, the motor control device corrects the torque constant by using a correction torque coefficient calculated based on an unloaded speed when a fixed voltage is applied. Alternatively, the torque constant is corrected using the correction torque coefficient calculated based on the motor applied voltage when the motor speed is fixed.
    Type: Grant
    Filed: February 27, 2019
    Date of Patent: November 5, 2019
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Mitsuhiro Sakamoto, Yasuyuki Yokouchi, Daisuke Sonoda, Ryuta Sasaki
  • Publication number: 20190199257
    Abstract: A motor control device at least includes a speed control part for controlling a motor rotation speed. The motor control device includes a torque correction means for suppressing variation in torque constant due to individual differences of motors. In addition, the motor control device corrects the torque constant by using a correction torque coefficient calculated based on an unloaded speed when a fixed voltage is applied. Alternatively, the torque constant is corrected using the correction torque coefficient calculated based on the motor applied voltage when the motor speed is fixed.
    Type: Application
    Filed: February 27, 2019
    Publication date: June 27, 2019
    Inventors: Mitsuhiro SAKAMOTO, Yasuyuki YOKOUCHI, Daisuke SONODA, Ryuta SASAKI
  • Patent number: 10270377
    Abstract: A motor control device at least includes a speed control part for controlling a motor rotation speed. The motor control device includes a torque correction means for suppressing variation in torque constant due to individual differences of motors. In addition, the motor control device corrects the torque constant by using a correction torque coefficient calculated based on an unloaded speed when a fixed voltage is applied. Alternatively, the torque constant is corrected using the correction torque coefficient calculated based on the motor applied voltage when the motor speed is fixed.
    Type: Grant
    Filed: January 26, 2016
    Date of Patent: April 23, 2019
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Mitsuhiro Sakamoto, Yasuyuki Yokouchi, Daisuke Sonoda, Ryuta Sasaki
  • Patent number: 9973138
    Abstract: A brushless motor includes: a motor including a stator around which a winding wire is wound and a rotor holding a permanent magnet; a motor control microcomputer; an inverter circuit in which a power element is incorporated and controls an amount of a voltage applied to the winding wire; a temperature detecting element which detects a temperature of the power element; and a current detecting element which detects a power supply current or a current of the winding wire. A first current limit value is defined by current limit value which is set such that a junction temperature of the power element does not exceed a predetermined value, the brushless motor sets a second current limit value which is higher than the first current limit value, and the brushless motor operates, based on the second current limit value only in a predetermined period after start-up of the brushless motor.
    Type: Grant
    Filed: September 2, 2015
    Date of Patent: May 15, 2018
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Yoshikazu Sengokudani, Mitsuhiro Sakamoto, Hideharu Hiwaki
  • Patent number: 9929683
    Abstract: Provided is a motor drive device which performs switching, with respect to a synchronous motor including a stator around which a motor winding is wound and a rotor holding a permanent magnet, from a synchronous operation in which the synchronous motor is synchronously driven to position-sensorless vector control in which a current supplied to the motor winding is controlled based on a position of the rotor. During the synchronous operation, the present motor drive device calculates, by estimation, an induced voltage error based on the detected current and voltage, performs control of an amplitude of a current instruction such that an error, of a target induced voltage, calculated based on an estimated induced voltage and based on an internal angle becomes equal to the induced voltage error, and switches the mode to the sensorless mode after the error is reduced to be within a range of a predetermined value.
    Type: Grant
    Filed: August 28, 2015
    Date of Patent: March 27, 2018
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Daisuke Sonoda, Mitsuhiro Sakamoto, Toru Tazawa
  • Publication number: 20170214343
    Abstract: Provided is a motor drive device which performs switching, with respect to a synchronous motor including a stator around which a motor winding is wound and a rotor holding a permanent magnet, from a synchronous operation in which the synchronous motor is synchronously driven to position-sensorless vector control in which a current supplied to the motor winding is controlled based on a position of the rotor. During the synchronous operation, the present motor drive device calculates, by estimation, an induced voltage error based on the detected current and voltage, performs control of an amplitude of a current instruction such that an error, of a target induced voltage, calculated based on an estimated induced voltage and based on an internal angle becomes equal to the induced voltage error, and switches the mode to the sensorless mode after the error is reduced to be within a range of a predetermined value.
    Type: Application
    Filed: August 28, 2015
    Publication date: July 27, 2017
    Inventors: DAISUKE SONODA, MITSUHIRO SAKAMOTO, TORU TAZAWA
  • Publication number: 20170214358
    Abstract: A brushless motor for a washing machine is provided, and the brushless motor includes: a motor including a stator around which a winding wire is wound and a rotor holding a permanent magnet; a motor control microcomputer; an inverter circuit in which a power element is incorporated and controls an amount of a voltage applied to the winding wire; a temperature detecting element which detects a temperature of the power element; and a current detecting element which detects a power supply current or a current of the winding wire. A first current limit value is defined by current limit value which is set such that a junction temperature of the power element does not exceed a predetermined value on a premise that the brushless motor performs a continuous operation, the brushless motor sets a second current limit value which is higher than the first current limit value, and the brushless motor operates, based on the second current limit value only in a predetermined period after start-up of the brushless motor.
    Type: Application
    Filed: September 2, 2015
    Publication date: July 27, 2017
    Inventors: YOSHIKAZU SENGOKUDANI, MITSUHIRO SAKAMOTO, HIDEHARU HIWAKI
  • Publication number: 20170163194
    Abstract: A motor control device at least includes a speed control part for controlling a motor rotation speed. The motor control device includes a torque correction means for suppressing variation in torque constant due to individual differences of motors. In addition, the motor control device corrects the torque constant by using a correction torque coefficient calculated based on an unloaded speed when a fixed voltage is applied. Alternatively, the torque constant is corrected using the correction torque coefficient calculated based on the motor applied voltage when the motor speed is fixed.
    Type: Application
    Filed: January 26, 2016
    Publication date: June 8, 2017
    Inventors: MITSUHIRO SAKAMOTO, YASUYUKI YOKOUCHI, DAISUKE SONODA, RYUTA SASAKI
  • Patent number: 9214884
    Abstract: A motor driving device of the present invention is a motor driving device that incorporates so-called vector control of controlling a current applied to a motor winding in accordance with the position of a rotor. The motor driving device receives the input of a duty command value from a host controller via a command input port, for example. The motor driving device obtains a current command or a speed command as a command value such that the input duty command value is equal to the duty of a drive pulse output from an inverter. Then, the motor driving device performs vector control based on the obtained command value.
    Type: Grant
    Filed: April 1, 2014
    Date of Patent: December 15, 2015
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Daisuke Sonoda, Yasushi Kato, Yasuyuki Yokouchi, Mitsuhiro Sakamoto
  • Publication number: 20140306626
    Abstract: A motor driving device of the present invention is a motor driving device that incorporates so-called vector control of controlling a current applied to a motor winding in accordance with the position of a rotor. The motor driving device receives the input of a duty command value from a host controller via a command input port, for example. The motor driving device obtains a current command or a speed command as a command value such that the input duty command value is equal to the duty of a drive pulse output from an inverter. Then, the motor driving device performs vector control based on the obtained command value.
    Type: Application
    Filed: April 1, 2014
    Publication date: October 16, 2014
    Applicant: PANASONIC CORPORATION
    Inventors: Daisuke SONODA, Yasushi KATO, Yasuyuki YOKOUCHI, Mitsuhiro SAKAMOTO
  • Patent number: 5695531
    Abstract: The object of the present invention is to provide a fuel treating device having a small pressure loss and a high contacting efficiency between fuel and fuel treating material. To attain said object, fuel treating material(s) 16, 26, 36 is(are) movably arranged in a fuel treating container 12, 22, 32 and said fuel treating material(s) 16, 26, 36 is(are) moved by flow pressure of the fuel to improve the contacting efficiency between said fuel treating material(s) 16, 26, 36 and the fuel and treat fuel by contacting with said fuel treating materials 16, 26, 36.
    Type: Grant
    Filed: December 6, 1995
    Date of Patent: December 9, 1997
    Inventors: Shinji Makino, Mitsuhiro Sakamoto
  • Patent number: 4223420
    Abstract: A hinge structure for automobile hoods, including a first bracket fixedly connected to the automobile hood, a second bracket fixedly connected to an automobile body, a link mechanism rotatably supporting both brackets by a link mechanism, an urging mechanism for urging the first bracket into the raising direction thereof, the hinge structure characterized in that a link connecting member having an elastic portion is fixed to the autobomile body at the rotating position of the link mechanism upon fully opening the automobile hood and the link mechanism is connected to the link connecting member by bending the elastic member.
    Type: Grant
    Filed: October 5, 1978
    Date of Patent: September 23, 1980
    Assignee: Aisin Seiki Company, Limited
    Inventors: Kazuyoshi Yukimoto, Shinzi Ogasawara, Mitsuhiro Sakamoto, Yasunori Kawamura
  • Patent number: 3944198
    Abstract: An impact absorber for an automobile bumper includes a first cylinder having a closed end and filled with a damping liquid. A second cylinder, closed at one end and having a radial partition wall therein, moves within the first cylinder for transmitting an impact force to the damping liquid. A sealing member is secured to the inner part of the first cylinder to define a first chamber with the first and second cylinders. A plurality of throttling ports are provided on the second cylinder for expelling the damping liquid from the first chamber thereby providing a variable orifice effect in cooperation with the sealing member upon movement of the second cylinder for dampening the impact force. A second chamber is provided for receiving the expelled damping liquid. The expelled damping liquid, within the second chamber, urges a piston to slidably move within the second cylinder toward the direction opposite the first chamber.
    Type: Grant
    Filed: December 2, 1974
    Date of Patent: March 16, 1976
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventor: Mitsuhiro Sakamoto