Patents by Inventor Katsuhiro Hoshino

Katsuhiro Hoshino 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: 10693410
    Abstract: A control device and a control method for a rotary electric motor, and a rotary electric motor drive system capable of reliably suppressing vibration of the rotary electric motor are provided. A rotary electric motor is controlled by PWM at a predetermined carrier frequency, and in a case where a vibration frequency in a space zero-order eigenmode of the rotary electric motor and a frequency of a frequency component of electromagnetic exciting force that generates the eigenmode overlap with each other, a value of the carrier frequency is switched from a first value to a second value different from the first value.
    Type: Grant
    Filed: July 12, 2017
    Date of Patent: June 23, 2020
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Takeshi Yoshida, Takafumi Hara, Katsuhiro Hoshino, Kazuto Oyama
  • Publication number: 20200119678
    Abstract: An object of the present invention is to effectively reduce vibration or noise caused by a motor. An inverter circuit 300 generates an alternating current from a direct current supplied from a direct current power supply 10 by using a plurality of IGBTs 311 which are switching elements, supplies the generated alternating current to a motor 100, and drives the motor 100. This alternating current includes a fundamental harmonic current corresponding to a rotational speed of the motor 100, and a harmonic current of a switching operation of the IGBTs 311. A controller 200 controls a second phase such that a first phase and the second phase are not superimposed on each other at a predetermined motor rotational speed, the first phase being a phase of an excitation force cyclically produced in the motor 100 by the fundamental harmonic current, and the second phase being a phase of an excitation force cyclically produced in the motor 100 by the harmonic current.
    Type: Application
    Filed: January 17, 2018
    Publication date: April 16, 2020
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Katsuhiro HOSHINO, Takafumi HARA, Masaru YAMASAKI, Yosuke TANABE, Masanori WATANABE
  • Patent number: 10516332
    Abstract: In a case where a switching element of an inverter does not operate properly due to failure or the like, a three-phase short circuit cannot be made, and an induced voltage cannot be suppressed. An induced voltage suppression device is electrically connected to the three-phase wiring between the power converter and the motor, in parallel to the power converter. A rectification circuit including a three-phase diode bridge circuit. A DC voltage source including a capacitor. A voltage detection circuit detects a voltage of both ends of the DC voltage source. In a short circuit, when a transistor of the voltage detection circuit is turned on, transistors are turned on to perform three-phase short-circuit operation to suppress an induced voltage of the motor. Since the induced voltage suppression device secures a DC voltage by the induced voltage of the motor as a drive source in a self-excited manner, it is possible to suppress the induced voltage even when an abnormality occurs in the power converter.
    Type: Grant
    Filed: July 4, 2017
    Date of Patent: December 24, 2019
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Seigo Yukutake, Hideki Miyazaki, Katsuhiro Hoshino
  • Patent number: 10498283
    Abstract: Provided is a motor drive device capable of adjusting a 0-axis current to a desired value. A motor drive device (inverter device 100) for an open winding type motor 200 in which a stator winding wire includes three-phase independent winding wires 210, 220, and 230 includes a plurality of single-phase inverters 160, 170, and 180 provided for each of the winding wires 210 to 230 to individually apply a voltage to a corresponding winding wire, and a controller 150 that controls each of the single-phase inverters 160 to 180. The controller 150 adjusts a 0-axis current to a predetermined value by alternately and repeatedly generating a first period in which a sum of voltages applied to the respective independent winding wires 210 to 230 is set to a value other than zero to offset the 0-axis current and a second period in which the sum of the voltages applied to the respective winding wires 210 to 230 is set to zero.
    Type: Grant
    Filed: January 15, 2016
    Date of Patent: December 3, 2019
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Toshisada Mitsui, Hideki Miyazaki, Seigo Yukutake, Katsuhiro Hoshino
  • Publication number: 20190334469
    Abstract: This is to reduce electromagnetic noise while reducing a calculation load of a microcomputer. An inverter drive device according to the present invention switches a first control mode, a second control mode, and a third control mode on the basis of vehicle speed information in a motor control device that controls a power converter that drives a polyphase motor by a PWM pulse signal based on a carrier signal, the first control mode being for updating a command voltage signal to the power converter only on a ridge side or a trough side of the carrier signal, the second control mode being for updating a command voltage signal to the power converter both on a ridge side and a trough side of the carrier signal, and the third control mode being for updating a command voltage signal to the power converter only once of ridge-trough-ridge or trough-ridge-trough of the carrier signal.
    Type: Application
    Filed: November 10, 2017
    Publication date: October 31, 2019
    Inventors: Takafumi HARA, Toshiyuki AJIMA, Katsuhiro HOSHINO, Akihiro ASHIDA, Kazuto OYAMA
  • Patent number: 10447183
    Abstract: A motor is driven while suppressing drive torque ripple generated by the motor, when any of the phases is opened during the driving of the motor. A motor drive device controls the driving of a motor in which the armature windings of respective phases are independently provided. The motor drive device is equipped with: an inverter circuit for converting the DC power supplied through DC bus lines to three-phase AC powers and respectively outputting the three-phase AC powers to the armature windings of the respective phases; and a controller for controlling the inverter circuit. When any of the phases is opened in the AC powers output from the inverter circuit, the controller adjusts the difference between the phases of the respective currents flowing through the armature windings of normal phases so that the AC powers of the other normal phases except the opened phase are compensated each other.
    Type: Grant
    Filed: June 24, 2015
    Date of Patent: October 15, 2019
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Katsuhiro Hoshino, Shingo Nishiguchi, Toshisada Mitsui, Kazuto Oyama, Hideki Miyazaki
  • Patent number: 10396702
    Abstract: A motor drive control device is a device which drives and controls a permanent magnet synchronous motor in which each phase is independently controlled, and includes a 0-axis current calculation unit which calculates and outputs a 0-axis current iz on the basis of a motor current; a 0-axis current determination unit which compares and determines a reference 0-axis current value izs, which is the 0-axis current value when the temperature of a permanent magnet provided in the permanent magnet synchronous motor is a reference temperature with the calculated 0-axis current iz; and a switching signal generation unit which drives and controls inverters on the basis of the result of comparison determination of the 0-axis current determination unit.
    Type: Grant
    Filed: January 20, 2016
    Date of Patent: August 27, 2019
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Katsuhiro Hoshino, Toshisada Mitsui, Seigo Yukutake, Hideki Miyazaki
  • Publication number: 20190238049
    Abstract: In a case where a switching element of an inverter does not operate properly due to failure or the like, a three-phase short circuit cannot be made, and an induced voltage cannot be suppressed. An induced voltage suppression device is electrically connected to the three-phase wiring between the power converter and the motor, in parallel to the power converter. A rectification circuit is composed of a three-phase diode bridge circuit. A DC voltage source is composed of a capacitor. A voltage detection circuit detects a voltage of both ends of the DC voltage source. In a short circuit, when a transistor of the voltage detection circuit is turned on, transistors are turned on to perform three-phase short-circuit operation to suppress an induced voltage of the motor. Since the induced voltage suppression device secures a DC voltage by the induced voltage of the motor as a drive source in a self-excited manner, it is possible to suppress the induced voltage even when an abnormality occurs in the power converter.
    Type: Application
    Filed: July 4, 2017
    Publication date: August 1, 2019
    Inventors: Seigo YUKUTAKE, Hideki MIYAZAKI, Katsuhiro HOSHINO
  • Publication number: 20190222160
    Abstract: A control device and a control method for a rotary electric motor, and a rotary electric motor drive system capable of reliably suppressing vibration of the rotary electric motor are provided. A rotary electric motor is controlled by PWM at a predetermined carrier frequency, and in a case where a vibration frequency in a space zero-order eigenmode of the rotary electric motor and a frequency of a frequency component of electromagnetic exciting force that generates the eigenmode overlap with each other, a value of the carrier frequency is switched from a first value to a second value different from the first value.
    Type: Application
    Filed: July 12, 2017
    Publication date: July 18, 2019
    Inventors: Takeshi YOSHIDA, Takafumi HARA, Katsuhiro HOSHINO, Kazuto OYAMA
  • Publication number: 20190165715
    Abstract: A six-wire three-phase motor that can realize both of increasing an output and reducing a torque ripple is provided. A six-wire three-phase motor is a six-wire three-phase motor including: a stator including a winding wire wound independently between phases; and a rotor including a plurality of magnets in a circumferential direction, wherein the stator or the rotor is configured in such a manner that a third harmonic current component in a motor current of when an overmodulation voltage based on a PWM signal is applied becomes higher than a third harmonic current component in a motor current of when a sinusoidal modulation voltage based on the PWM signal is applied.
    Type: Application
    Filed: June 19, 2017
    Publication date: May 30, 2019
    Inventors: Katsuhiro HOSHINO, Hideki MIYAZAKI
  • Publication number: 20190102491
    Abstract: The invention is directed to modeling of heat and vibration for structures. Therefore, with a traditional model division for each component, one-to-one correspondence between the models and the components is not necessarily realized. There has been a problem in that it is difficult to divide the models. To solve the above problem, a simulation program according to the present invention includes a first model for calculating a first vehicle characteristics parameter, a second model for calculating a second vehicle characteristics parameter to transfer energy without converting the energy, and an interface model for performing conversion calculation of the first vehicle characteristics parameter and the second vehicle characteristics parameter.
    Type: Application
    Filed: January 19, 2017
    Publication date: April 4, 2019
    Inventors: Taizou MIYAZAKI, Masaru YAMASAKI, Takafumi HARA, Katsuhiro HOSHINO, Kazuto OYAMA, Takeshi YOSHIDA
  • Patent number: 10230320
    Abstract: Provided is a motor drive device capable of adjusting a 0-axis current to a desired value. A motor drive device (inverter device 100) for an open winding type motor 200 in which a stator winding wire includes three-phase independent winding wires 210, 220, and 230 includes a plurality of single-phase inverters 160, 170, and 180 provided for each of the winding wires 210 to 230 to individually apply a voltage to a corresponding winding wire, and a controller 150 that controls each of the single-phase inverters 160 to 180. The controller 150 adjusts a 0-axis current to a predetermined value by alternately and repeatedly generating a first period in which a sum of voltages applied to the respective independent winding wires 210 to 230 is set to a value other than zero to offset the 0-axis current and a second period in which the sum of the voltages applied to the respective winding wires 210 to 230 is set to zero.
    Type: Grant
    Filed: January 15, 2016
    Date of Patent: March 12, 2019
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Toshisada Mitsui, Hideki Miyazaki, Seigo Yukutake, Katsuhiro Hoshino
  • Publication number: 20190013760
    Abstract: The present invention is devised to allow accurate determination on quality of a current sensor, and provide a current sensor reduced in size and cost and an inverter having the current sensor. A direct-current sensor 380 detects direct currents supplied to a plurality of inverters 300 and 301 for driving an alternating-current motor 200 in which winding wires of a stator are independent from each other in individual phases and a voltage is individually applied to the independent winding wires. The plurality of inverters has a P connecting wire 150 connecting P buses and an N connecting wire 160 connecting N buses. The direct-current sensor 380 has a core surrounding the P connecting wire and the N connecting wire to detect the currents flowing into and out of the P bus and the N bus. This makes it possible to employ a small-capacity current sensor, improve the sensor accuracy, and allow accurate determination on the quality of the current sensor.
    Type: Application
    Filed: December 16, 2016
    Publication date: January 10, 2019
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Toshisada MITSUI, Hideki MIYAZAKI, Koichi YAHATA, Katsuhiro HOSHINO
  • Publication number: 20180241340
    Abstract: Provided is a motor drive control device which is capable of properly driving and controlling a permanent magnet synchronous motor capable of independently controlling each phase in accordance with the temperature of the permanent magnet.
    Type: Application
    Filed: January 20, 2016
    Publication date: August 23, 2018
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Katsuhiro HOSHINO, Toshisada MITSUI, Seigo YUKUTAKE, Hideki MIYAZAKI
  • Publication number: 20180034406
    Abstract: Provided is a motor drive device capable of adjusting a 0-axis current to a desired value. A motor drive device (inverter device 100) for an open winding type motor 200 in which a stator winding wire includes three-phase independent winding wires 210, 220, and 230 includes a plurality of single-phase inverters 160, 170, and 180 provided for each of the winding wires 210 to 230 to individually apply a voltage to a corresponding winding wire, and a controller 150 that controls each of the single-phase inverters 160 to 180. The controller 150 adjusts a 0-axis current to a predetermined value by alternately and repeatedly generating a first period in which a sum of voltages applied to the respective independent winding wires 210 to 230 is set to a value other than zero to offset the 0-axis current and a second period in which the sum of the voltages applied to the respective winding wires 210 to 230 is set to zero.
    Type: Application
    Filed: January 15, 2016
    Publication date: February 1, 2018
    Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Toshisada MITSUI, Hideki MIYAZAKI, Seigo YUKUTAKE, Katsuhiro HOSHINO
  • Patent number: 9694688
    Abstract: In order to provide an electric vehicle drive system capable of promoting improvement in stability of vehicle traveling when stopping a regeneration operation during operation of a regeneration cooperative brake, the electric vehicle drive system, a battery control unit 310, upon detecting that a battery state is an unchargeable state during control of the regeneration cooperative brake, diagnoses whether a battery 300 is chargeable, and upon deciding to be unchargeable from a result of diagnosis, outputs a Fail signal. Then, a rotating electrical machine control unit 210, upon receiving a Fail prediction signal while the regeneration cooperative brake is being controlled, executes loss increase control for increasing an internal loss of a rotating electrical machine 900 and reducing regenerative electric power by a regenerative brake while maintaining torque of the rotating electrical machine 900 at regenerative torque corresponding to regenerative brake force.
    Type: Grant
    Filed: July 24, 2013
    Date of Patent: July 4, 2017
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Kazuto Oyama, Hideki Miyazaki, Katsuhiro Hoshino
  • Publication number: 20170133958
    Abstract: The purpose of the present invention is to continue to drive a motor while suppressing drive torque ripple generated by the motor, when any of the phases is opened during the driving of the motor. A motor drive device controls the driving of a motor in which the armature windings of respective phases are independently provided. The motor drive device is equipped with: an inverter circuit for converting the DC power supplied through DC bus lines to three-phase AC powers and respectively outputting the three-phase AC powers to the armature windings of the respective phases; and a controller for controlling the inverter circuit. When any of the phases is opened in the AC powers output from the inverter circuit, the controller adjusts the difference between the phases of the respective currents flowing through the armature windings of normal phases so that the AC powers of the other normal phases except the opened phase are compensated each other.
    Type: Application
    Filed: June 24, 2015
    Publication date: May 11, 2017
    Inventors: Katsuhiro HOSHINO, Shingo NISHIGUCHI, Toshisada MITSUI, Kazuto OYAMA, Hideki MIYAZAKI
  • Publication number: 20150303860
    Abstract: In order to provide a motor capable of detecting a temperature of a magnet 21 embedded in a rotor 20 with a high degree of accuracy, the motor includes: a stator 25 equipped with a coil 24, a case 22 that secures the stator 25, the rotor 20 supported by the case 22 via bearings 23, and an internal air temperature sensor 17 that is attached to an inner surface of the case 22 via an internal-air-temperature-detection-point support member 18 and measures a temperature of internal air 27 which is air filling the inside of the case 22.
    Type: Application
    Filed: October 21, 2013
    Publication date: October 22, 2015
    Inventors: Yuto IMANISHI, Toshisada MITSUI, Katsuhiro HOSHINO, Atsushi YOKOYAMA, Hiroyuki YAMADA
  • Publication number: 20150202966
    Abstract: In order to provide an electric vehicle drive system capable of promoting improvement in stability of vehicle traveling when stopping a regeneration operation during operation of a regeneration cooperative brake, the electric vehicle drive system, a battery control unit 310, upon detecting that a battery state is an unchargeable state during control of the regeneration cooperative brake, diagnoses whether a battery 300 is chargeable, and upon deciding to be unchargeable from a result of diagnosis, outputs a Fail signal. Then, a rotating electrical machine control unit 210, upon receiving a Fail prediction signal while the regeneration cooperative brake is being controlled, executes loss increase control for increasing an internal loss of a rotating electrical machine 900 and reducing regenerative electric power by a regenerative brake while maintaining torque of the rotating electrical machine 900 at regenerative torque corresponding to regenerative brake force.
    Type: Application
    Filed: July 24, 2013
    Publication date: July 23, 2015
    Applicant: Hitachi Automotive Systems, Ltd.
    Inventors: Kazuto Oyama, Hideki Miyazaki, Katsuhiro Hoshino
  • Publication number: 20140306563
    Abstract: Disclosed is a mechanical-electrical integrated electric drive system capable of returning common mode current from a rotary electric machine's side to a virtual neutral point of a power-conversion device inside the electric drive system, where the system comprises a rotary electric machine that includes a rotor, a stator having a stator core including armature windings, and a housing holding the stator and having AC terminals of the armature windings arranged thereon; a power conversion device that is fixed to the periphery of the housing and includes an inverter circuit and AC bus bars connecting the inverter circuit with the AC terminals; conductor rings that are arranged in contact with the stator core to collect common mode current deriving from stray capacitance of the stator; and a connection wire that connects the conductor bar to a virtual neutral point on the DC input side of the inverter circuit.
    Type: Application
    Filed: November 5, 2012
    Publication date: October 16, 2014
    Inventors: Kazuto Oyama, Kosuke Suzuki, Hideki Miyazaki, Katsuhiro Hoshino