Patents by Inventor Toshisada Mitsui
Toshisada Mitsui 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).
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Patent number: 11356037Abstract: To improve control characteristics of an inverter while suppressing manufacturing cost. An inverter control device 10 is a device for controlling an inverter device 1 having a plurality of switching elements.Type: GrantFiled: March 12, 2019Date of Patent: June 7, 2022Assignee: HITACHI ASTEMO, LTD.Inventors: Taizou Miyazaki, Toshiyuki Ajima, Toshisada Mitsui
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Patent number: 11095243Abstract: Pulsating current (ripple) is generated in a zero-phase current to increase a loss. A motor control system includes an inverter which drives a motor which includes windings separately wound around each phase and an inverter control unit which generates an output voltage pulse corresponding to each phase to control the inverter on the basis of a torque command value and a rotor position of the motor. The inverter control unit divides the output voltage pulse of at least one phase of the output voltage pulses into several pulses during one period of the output voltage pulse such that a zero-phase voltage of only one of positive and negative polarities is output several times from the motor in the one pulse period.Type: GrantFiled: May 24, 2018Date of Patent: August 17, 2021Assignee: Hitachi Automotive Systems, Ltd.Inventors: Takahiro Araki, Hideki Miyazaki, Toshisada Mitsui
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Publication number: 20210152116Abstract: Pulsating current (ripple) is generated in a zero-phase current to increase a loss. A motor control system includes an inverter which drives a motor which includes windings separately wound around each phase and an inverter control unit which generates an output voltage pulse corresponding to each phase to control the inverter on the basis of a torque command value and a rotor position of the motor. The inverter control unit divides the output voltage pulse of at least one phase of the output voltage pulses into several pulses during one period of the output voltage pulse such that a zero-phase voltage of only one of positive and negative polarities is output several times from the motor in the one pulse period.Type: ApplicationFiled: May 24, 2018Publication date: May 20, 2021Inventors: Takahiro ARAKI, Hideki MIYAZAKI, Toshisada MITSUI
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Publication number: 20210119553Abstract: To improve control characteristics of an inverter while suppressing manufacturing cost. An inverter control device 10 is a device for controlling an inverter device 1 having a plurality of switching elements.Type: ApplicationFiled: March 12, 2019Publication date: April 22, 2021Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Taizou MIYAZAKI, Toshiyuki AJIMA, Toshisada MITSUI
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Patent number: 10498283Abstract: 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: GrantFiled: January 15, 2016Date of Patent: December 3, 2019Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Toshisada Mitsui, Hideki Miyazaki, Seigo Yukutake, Katsuhiro Hoshino
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Patent number: 10447183Abstract: 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: GrantFiled: June 24, 2015Date of Patent: October 15, 2019Assignee: Hitachi Automotive Systems, Ltd.Inventors: Katsuhiro Hoshino, Shingo Nishiguchi, Toshisada Mitsui, Kazuto Oyama, Hideki Miyazaki
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Patent number: 10396702Abstract: 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: GrantFiled: January 20, 2016Date of Patent: August 27, 2019Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Katsuhiro Hoshino, Toshisada Mitsui, Seigo Yukutake, Hideki Miyazaki
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Patent number: 10367438Abstract: An object of the present invention is to reduce an overcurrent of an inverter and a motor. A control device for an electric motor in which windings of respective phases are independently connected, the control device for the electric motor uses a zero-phase current calculation means for calculating a zero-phase current based on detection values of currents of the respective phases flowing in the electric motor and a position of a rotor of the electric motor to control a current flowing in the electric motor such that a vector sum of a drive current and the zero-phase current is equal to or lower than a predetermined current.Type: GrantFiled: May 11, 2016Date of Patent: July 30, 2019Assignee: Hitachi Automotive Systems, Ltd.Inventors: Takahiro Araki, Hideki Miyazaki, Toshisada Mitsui
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Patent number: 10230320Abstract: 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: GrantFiled: January 15, 2016Date of Patent: March 12, 2019Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Toshisada Mitsui, Hideki Miyazaki, Seigo Yukutake, Katsuhiro Hoshino
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Publication number: 20190013760Abstract: 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: ApplicationFiled: December 16, 2016Publication date: January 10, 2019Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Toshisada MITSUI, Hideki MIYAZAKI, Koichi YAHATA, Katsuhiro HOSHINO
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Publication number: 20180375454Abstract: It is an object of the present invention to reduce detection error of zero-phase current. A control device of a motor in which a winding is independently connected for each phase, the control device including: a control unit controlling a voltage applied to the motor on the basis of a torque command value, wherein the control unit provides a first period in which a zero-phase voltage pulse for outputting a zero-phase voltage for reducing a zero-phase current which is determined based on an alternating current of each phase is output, and a second period in which a current of each phase flowing in the motor is detected, and the first period and the second period are not overlapped.Type: ApplicationFiled: October 21, 2016Publication date: December 27, 2018Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Takahiro ARAKI, Hideki MIYAZAKI, Toshisada MITSUI
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Publication number: 20180241340Abstract: 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: ApplicationFiled: January 20, 2016Publication date: August 23, 2018Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Katsuhiro HOSHINO, Toshisada MITSUI, Seigo YUKUTAKE, Hideki MIYAZAKI
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Publication number: 20180152128Abstract: An object of the present invention is to reduce an overcurrent of an inverter and a motor. A control device for an electric motor in which windings of respective phases are independently connected, the control device for the electric motor uses a zero-phase current calculation means for calculating a zero-phase current based on detection values of currents of the respective phases flowing in the electric motor and a position of a rotor of the electric motor to control a current flowing in the electric motor such that a vector sum of a drive current and the zero-phase current is equal to or lower than a predetermined current.Type: ApplicationFiled: May 11, 2016Publication date: May 31, 2018Applicant: Hitachi Automotive Systems, Ltd.Inventors: Takahiro ARAKI, Hideki MIYAZAKI, Toshisada MITSUI
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Publication number: 20180034406Abstract: 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: ApplicationFiled: January 15, 2016Publication date: February 1, 2018Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Toshisada MITSUI, Hideki MIYAZAKI, Seigo YUKUTAKE, Katsuhiro HOSHINO
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Publication number: 20170133958Abstract: 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: ApplicationFiled: June 24, 2015Publication date: May 11, 2017Inventors: Katsuhiro HOSHINO, Shingo NISHIGUCHI, Toshisada MITSUI, Kazuto OYAMA, Hideki MIYAZAKI
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Publication number: 20150303860Abstract: 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: ApplicationFiled: October 21, 2013Publication date: October 22, 2015Inventors: Yuto IMANISHI, Toshisada MITSUI, Katsuhiro HOSHINO, Atsushi YOKOYAMA, Hiroyuki YAMADA
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Publication number: 20140292238Abstract: A power conversion device includes a switching circuit with multiple series circuits having upper arm switching elements connected in series with lower arm switching elements, receives DC power to generate AC power for a permanent magnet motor; a control circuit that calculates a state of the switching elements based on input information for each control cycle, and generates a control signal for controlling switching elements according; and a driver circuit that generates a drive signal that renders the switching elements conductive or non-conductive on the basis of the control signal from the control circuit. The control circuit predicts a locus of a d-axial magnetic flux and a locus of a q-axial magnetic flux, and calculates the state of the switching elements so that the d-axial magnetic flux falls within a given d-axial magnetic flux fluctuation range, and the q-axial magnetic flux falls within a given q-axial magnetic flux fluctuation range.Type: ApplicationFiled: August 29, 2012Publication date: October 2, 2014Applicant: Hitachi Automotive Systems, Ltd.Inventors: Kimihisa Furukawa, Toshiyuki Ajima, Hiroyuki Yamada, Toshisada Mitsui
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Publication number: 20140049198Abstract: A power conversion device includes a power switching circuit that supplies AC voltages generated between switching elements operating as upper arms and switching elements operating as lower arms, and a control circuit that generates and supplies to the driver circuit signals for controlling the switching operation of the switching elements by a PWM method in a first operational region in which frequency of an AC power to be outputted is low, and that generates and supplies to the driver circuit signals for controlling the switching operation of the switching elements at timings based upon the phase of the AC power to be outputted in an operational region in which the frequency of the AC power to be outputted is higher than in the first operational region.Type: ApplicationFiled: August 9, 2013Publication date: February 20, 2014Applicant: Hitachi, Ltd.Inventors: Kazuto OOYAMA, Toshisada MITSUI, Shingo NISHIGUCHI, Kimihisa FURUKAWA
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Patent number: 8471518Abstract: A power conversion device includes a power switching circuit that has a plurality of series circuits in each of which a switching element that operates as an upper arm and a switching element that operates as a lower arm are connected in series, and a control circuit that generates control signals for controlling the continuity or discontinuity of the switching elements, and, if the relationship between the state of a switching element in a control cycle and the state of the switching element in the next control cycle is a discontinuous relationship, that additionally performs control to make the switching element continuous or discontinuous on the basis of the state of the switching element in the control cycle and the state of the switching element in the next control cycle.Type: GrantFiled: February 16, 2011Date of Patent: June 25, 2013Assignee: Hitachi, Ltd.Inventors: Shingo Nishiguchi, Kimihisa Furukawa, Akinori Kamiya, Toshisada Mitsui, Kazuto Ooyama
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Publication number: 20130066501Abstract: It is desirable to enhance efficiency of a power conversion device in both of a case where a motor generator which is an electric rotating machine is operated as a motor and a case where the motor generator is operated as a generator by performing regeneration braking. At the time of performing regeneration braking, strength of regeneration braking can be controlled by making an inverter circuit conductive in response to a predetermined phase of an AC output which the inverter circuit generates and by controlling a conduction width. Due to such a control, the number of times of switching a semiconductor element which constitutes the inverter circuit can be reduced thus suppressing heat generation of the semiconductor element and also the efficiency of the power conversion device can be enhanced. Further, the enhancement of efficiency of the power conversion device can be realized also in a motor operation and hence, it is also possible to enhance efficiency with respect to the traveling of a vehicle.Type: ApplicationFiled: April 28, 2010Publication date: March 14, 2013Applicant: Hitachi, Ltd.Inventors: Kazuto Oyama, Hideki Miyazaki, Kimihisa Furukawa, Toshisada Mitsui, Shingo Nishiguchi, Akinori Kamiya