Patents by Inventor Masutaka Watanabe
Masutaka Watanabe 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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Publication number: 20230213356Abstract: To provide a rotational angle detection apparatus which can determine abnormality of the rotational angle detection apparatus only by detection information of the rotational angle detection apparatus even when the rotational speed is low. A rotational angle detection apparatus totals sensor output values of N-1 pieces of the rotation detection sensors other than the diagnosis object sensor; calculates a value obtained by inverting positive/negative of a total value, as an estimation value of sensor output value of the diagnosis object sensor; calculates an estimation difference which is a difference between a sensor output value of the diagnosis object sensor, and the estimation value of sensor output value of the diagnosis object sensor; and determines that abnormality occurred in the diagnosis object sensor, when the estimation difference is out of a determination range for estimation difference.Type: ApplicationFiled: November 28, 2022Publication date: July 6, 2023Applicant: Mitsubishi Electric CorporationInventors: Masutaka WATANABE, Kensuke Hayashi, Masanori Tsuchihashi, Eiji Kanazawa
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Patent number: 11299062Abstract: MCU (2001) determines whether at least one of double three-phase inverter (2030) or battery (2002) has a failure, or battery (2002) is fully charged, and switches control to be performed in inverter (2030) between all-phase shut off and three-phase short circuit based on a motor rotation speed of double three-phase motor (2050) when MCU (2001) determines that any one of inverter (2030) and battery (2002) has a failure, or battery (2002) is fully charged. Battery (2002) and inverter (2030) can be protected when current is inhibited from flowing from motor (2050) to battery (2002) due to a failure of inverter (2030) or battery (2002).Type: GrantFiled: August 29, 2016Date of Patent: April 12, 2022Assignee: Mitsubishi Electric CorporationInventors: Yasukazu Murata, Keiichi Enoki, Masutaka Watanabe, Shingo Harada, Yoshimasa Nishijima
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Patent number: 11264928Abstract: A control device for an electric motor includes: a controller configured to apply switching control to an inverter configured to execute power conversion in accordance with a torque command, to thereby control AC power to be supplied to the electric motor; and a current sensor configured to detect a phase current, which flows through an AC cable configured to connect the electric motor and the inverter to each other, wherein the controller includes a disconnection detection unit configured to acquire the phase current detected by the current sensor as a phase current detection value, calculate based on the torque command a phase current command value directed to the electric motor, and determine presence or absence of a disconnection of the AC cable in each phase from a transition result of a difference value between the phase current command value and the phase current detection value in each phase.Type: GrantFiled: February 8, 2018Date of Patent: March 1, 2022Assignee: Mitsubishi Electric CorporationInventors: Tomohisa Shoda, Masutaka Watanabe, Yoshimasa Nishijima
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Patent number: 11050376Abstract: In order to reduce deviation of correction amount when calculating a magnetic pole position correction amount of a permanent magnet type rotating electrical machine, and perform magnetic pole position correction with high accuracy, in state where the permanent magnet type rotating electrical machine is rotated, a d-axis current command value and a q-axis current command value in dg vector control are kept substantially zero, an actual d-axis voltage and an actual q-axis voltage are calculated from a midpoint potential detected from a midpoint potential detection unit, a magnetic pole position correction amount is calculated based on a predetermined arithmetic expression from the actual d-axis voltage and the actual q-axis voltage, and magnetic pole position origin correction is performed based on the magnetic pole position correction amount.Type: GrantFiled: June 6, 2017Date of Patent: June 29, 2021Assignee: Mitsubishi Electric CorporationInventors: Yoshimasa Nishijima, Keiichi Enoki, Masutaka Watanabe, Yasukazu Murata, Shingo Harada, Kazuhiko Otsuka
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Patent number: 10992246Abstract: To provide a controller for an AC rotary machine capable of performing on/off control of the switching device of the set which does not fail, by considering the state of the AC rotary machine related to the windings of the failed set. A controller for an AC rotary machine, about a set in which the switching device failed, stops dq-axis current control, and turns on, in the case of the short circuit failure, and turns off, in the case of the open circuit failure, at least the respective phase switching devices of the positive electrode side or the negative electrode side which is the same side as the failed switching device; and about a set which does not fail, continues dq-axis current control and changes the current component of the d-axis according to the state of the AC rotary machine related to the windings of the failed set.Type: GrantFiled: December 7, 2015Date of Patent: April 27, 2021Assignee: Mitsubishi Electric CorporationInventors: Yoshimasa Nishijima, Keiichi Enoki, Masutaka Watanabe, Yasukazu Murata, Shingo Harada
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Publication number: 20210075355Abstract: A control device for an electric motor includes: a controller configured to apply switching control to an inverter configured to execute power conversion in accordance with a torque command, to thereby control AC power to be supplied to the electric motor; and a current sensor configured to detect a phase current, which flows through an AC cable configured to connect the electric motor and the inverter to each other, wherein the controller includes a disconnection detection unit configured to acquire the phase current detected by the current sensor as a phase current detection value, calculate based on the torque command a phase current command value directed to the electric motor, and determine presence or absence of a disconnection of the AC cable in each phase from a transition result of a difference value between the phase current command value and the phase current detection value in each phase.Type: ApplicationFiled: February 8, 2018Publication date: March 11, 2021Applicant: Mitsubishi Electric CorporationInventors: Tomohisa SHODA, Masutaka WATANABE, Yoshimasa NISHIJIMA
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Patent number: 10903772Abstract: When the connection between a DC power source and a multigroup-multiphase electric-power conversion apparatus is cut off, a control apparatus controls switching devices so that the respective states of the two or more groups of electric-power conversion apparatuses included in the multigroup-multiphase electric-power conversion apparatus are each switched stepwise from all-phase short-circuiting state to an all-phase cutoff state at different timings.Type: GrantFiled: May 17, 2017Date of Patent: January 26, 2021Assignee: Mitsubishi Electric CorporationInventors: Masutaka Watanabe, Keiichi Enoki, Yoshimasa Nishijima, Shingo Harada
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Patent number: 10821967Abstract: A temperature detection condition of a temperature detection unit used in a motor system is determined by: obtaining a phase current value flowing through a motor device and obtaining a temperature detection value; calculating, as an integrated phase current value, at least one of a first integrated phase current value, which is obtained by integrating an amount by which the phase current value exceeds a first phase current threshold, and a second integrated phase current value, which is obtained by integrating an amount by which the phase current value is smaller than a second phase current threshold that is equal to or smaller than the first phase current threshold; and determining an amount of variation in the temperature detection value detected by the temperature detection unit following the start of determination of the temperature detection condition and an amount of variation in the calculated integrated phase current value.Type: GrantFiled: November 13, 2017Date of Patent: November 3, 2020Assignee: Mitsubishi Electric CorporationInventors: Yasukazu Murata, Keiichi Enoki, Masutaka Watanabe, Yoshimasa Nishijima, Shingo Harada
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Publication number: 20200244201Abstract: To provide a controller for an AC rotary machine capable of performing on/off control of the switching device of the set which does not fail, by considering the state of the AC rotary machine related to the windings of the failed set. A controller for an AC rotary machine, about a set in which the switching device failed, stops dq-axis current control, and turns on, in the case of the short circuit failure, and turns off, in the case of the open circuit failure, at least the respective phase switching devices of the positive electrode side or the negative electrode side which is the same side as the failed switching device; and about a set which does not fail, continues dq-axis current control and changes the current component of the d-axis according to the state of the AC rotary machine related to the windings of the failed set.Type: ApplicationFiled: December 7, 2015Publication date: July 30, 2020Applicant: Mitsubishi Electric CorporationInventors: Yoshimasa NISHIJIMA, Keiichi ENOKI, Masutaka WATANABE, Yasukazu MURATA, Shingo HARADA
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Publication number: 20200144948Abstract: In order to reduce deviation of correction amount when calculating a magnetic pole position correction amount of a permanent magnet type rotating electrical machine, and perform magnetic pole position correction with high accuracy, in state where the permanent magnet type rotating electrical machine is rotated, a d-axis current command value and a q-axis current command value in dg vector control are kept substantially zero, an actual d-axis voltage and an actual q-axis voltage are calculated from a midpoint potential detected from a midpoint potential detection unit, a magnetic pole position correction amount is calculated based on a predetermined arithmetic expression from the actual d-axis voltage and the actual q-axis voltage, and magnetic pole position origin correction is performed based on the magnetic pole position correction amount.Type: ApplicationFiled: June 6, 2017Publication date: May 7, 2020Applicant: Mitsubishi Electric CorporationInventors: Yoshimasa NISHIJIMA, Keiichi ENOKI, Masutaka WATANABE, Yasukazu MURATA, Shingo HARADA, Kazuhiko OTSUKA
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Patent number: 10608569Abstract: A control device of an AC rotating electrical machine includes: a midpoint potential detection unit 12 that detects, for respective phases, midpoint potentials 43, 44, 45 of upper switching elements 41 and lower switching elements 42 of an inverter circuit 20; a phase current detection unit 23 that detects a phase current of each phase of an AC rotating electrical machine 3; and a CPU 11 that calculates a current estimated value Idc of DC current that is input from a DC power supply 2 to the inverter circuit 20, on the basis of the detected midpoint potential of each phase and the phase current of each phase.Type: GrantFiled: August 29, 2017Date of Patent: March 31, 2020Assignee: Mitsubishi Electric CorporationInventors: Daisuke Matsumuro, Keiichi Enoki, Yoshimasa Nishijima, Masutaka Watanabe, Shingo Harada, Yasukazu Murata
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Publication number: 20200067443Abstract: When the connection between a DC power source and a multigroup-multiphase electric-power conversion apparatus is cut off, a control apparatus controls switching devices so that the respective states of the two or more groups of electric-power conversion apparatuses included in the multigroup-multiphase electric-power conversion apparatus are each switched stepwise from a phase short-circuiting state to an all-phase cutoff state at different timings.Type: ApplicationFiled: May 17, 2017Publication date: February 27, 2020Applicant: Mitsubishi Electric CorporationInventors: Masutaka WATANABE, Keiichi ENOKI, Yoshimasa NISHIJIMA, Shingo HARADA
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Patent number: 10469015Abstract: A motor control device having a motor temperature sensor for detecting a magnet temperature of the motor, a magnet magnetic flux calculation section that calculates a magnet magnetic flux of the motor corresponding to the magnet temperature of the motor, a current combination candidate calculating section that calculates a d-q axis current combination candidate that minimizes the input current of the inverter within a voltage limit ellipse determined by a value that can be output by a voltage of a power supply of the motor, and a d-q axis current search section that searches the d-q axis current that minimizes the input current of the inverter within the range of the combination candidate of the d-q axis currents when the d-q axis current of the motor moves on a voltage limiting ellipse by automatic weakening flux control.Type: GrantFiled: June 22, 2015Date of Patent: November 5, 2019Assignee: Mitsubishi Electric CorporationInventors: Shingo Harada, Keiichi Enoki, Yasukazu Murata, Masutaka Watanabe, Yoshimasa Nishijima
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Patent number: 10404200Abstract: An AC-rotating-electric-machine control apparatus includes two or more electric-power conversion circuits that control respective voltages to be applied to the two or more groups of multi-phase armature windings, for each of the two or more groups of multi-phase armature windings; each of the two or more electric-power conversion circuits has two or more switching devices for opening or closing the corresponding group of multi-phase armature windings, for each of the phases; the two or more switching devices are switching-controlled in such a way that opening operation or duty control can be applied to the corresponding group of multi-phase armature windings.Type: GrantFiled: May 11, 2015Date of Patent: September 3, 2019Assignee: Mitsubishi Electric CorporationInventors: Masutaka Watanabe, Keiichi Enoki, Yasukazu Murata, Yoshimasa Nishijima, Shingo Harada
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Publication number: 20180278191Abstract: A control device of an AC rotating electrical machine includes: a midpoint potential detection unit 12 that detects, for respective phases, midpoint potentials 43, 44, 45 of upper switching elements 41 and lower switching elements 42 of an inverter circuit 20; a phase current detection unit 23 that detects a phase current of each phase of an AC rotating electrical machine 3; and a CPU 11 that calculates a current estimated value Idc of DC current that is input from a DC power supply 2 to the inverter circuit 20, on the basis of the detected midpoint potential of each phase and the phase current of each phase.Type: ApplicationFiled: August 29, 2017Publication date: September 27, 2018Applicant: Mitsubishi Electric CorporationInventors: Daisuke MATSUMURO, Keiichi ENOKI, Yoshimasa NISHIJIMA, Masutaka WATANABE, Shingo HARADA, Yasukazu MURATA
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Patent number: 10050569Abstract: An inverter control device that controls a multiple of inverters configured to use the same positive and negative direct current voltage bus lines connected to a power supply and driving a corresponding multiple of motors, the inverter control device including smoothing control means that controls an inverter outflow current so that voltage of the power supply is smoothed by a smoothing capacitor connected to the positive and negative direct current voltage bus lines, and two-phase modulation operation means that fixes a predetermined one phase of a three-phase modulated wave at either a maximum voltage or minimum voltage the inverter can output determined by a voltage between the positive and negative direct current voltage bus lines, and calculates a modulated wave that causes the other two phases to switch.Type: GrantFiled: February 14, 2017Date of Patent: August 14, 2018Assignee: Mitsubishi Electric CorporationInventors: Shingo Harada, Keiichi Enoki, Yasukazu Murata, Masutaka Watanabe, Yoshimasa Nishijima
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Patent number: 10027265Abstract: An inverter control device and inverter control method are such that, when there is a possibility of induction voltage caused by a multi-phase motor exceeding a breakdown voltage of a switching element of an inverter, two of three phases are first interrupted at an appropriate timing in order to restrict induction voltage when shifting from a three-phase short circuit to an all-phase interruption, after which a shift is made to an all-phase interruption at a timing at which currents of the three phases reach the vicinity of zero, whereby a leap in a direct current bus voltage is restricted.Type: GrantFiled: June 29, 2017Date of Patent: July 17, 2018Assignee: Mitsubishi Electric CorporationInventors: Shingo Harada, Keiichi Enoki, Masutaka Watanabe, Yoshimasa Nishijima, Yasukazu Murata, Michitaka Fujiwara
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Publication number: 20180154887Abstract: A temperature detection condition of a temperature detection unit used in a motor system is determined by: obtaining a phase current value flowing through a motor device and obtaining a temperature detection value; calculating, as an integrated phase current value, at least one of a first integrated phase current value, which is obtained by integrating an amount by which the phase current value exceeds a first phase current threshold, and a second integrated phase current value, which is obtained by integrating an amount by which the phase current value is smaller than a second phase current threshold that is equal to or smaller than the first phase current threshold; and determining an amount of variation in the temperature detection value detected by the temperature detection unit following the start of determination of the temperature detection condition and an amount of variation in the calculated integrated phase current value.Type: ApplicationFiled: November 13, 2017Publication date: June 7, 2018Applicant: Mitsubishi Electric CorporationInventors: Yasukazu MURATA, Keiichi ENOKI, Masutaka WATANABE, Yoshimasa NISHIJIMA, Shingo HARADA
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Publication number: 20180138844Abstract: An inverter control device and inverter control method are such that, when there is a possibility of induction voltage caused by a multi-phase motor exceeding a breakdown voltage of a switching element of an inverter, two of three phases are first interrupted at an appropriate timing in order to restrict induction voltage when shifting from a three-phase short circuit to an all-phase interruption, after which a shift is made to an all-phase interruption at a timing at which currents of the three phases reach the vicinity of zero, whereby a leap in a direct current bus voltage is restricted.Type: ApplicationFiled: June 29, 2017Publication date: May 17, 2018Applicant: Mitsubishi Electric CorporationInventors: Shingo HARADA, Keiichi ENOKI, Masutaka WATANABE, Yoshimasa NISHIJIMA, Yasukazu MURATA, Michitaka FUJIWARA
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Publication number: 20180123493Abstract: A motor control device having a motor temperature sensor for detecting a magnet temperature of the motor, a magnet magnetic flux calculation section that calculates a magnet magnetic flux of the motor corresponding to the magnet temperature of the motor, a current combination candidate calculating section that calculates a d-q axis current combination candidate that minimizes the input current of the inverter within a voltage limit ellipse determined by a value that can be output by a voltage of a power supply of the motor, and a d-q axis current search section that searches the d-q axis current that minimizes the input current of the inverter within the range of the combination candidate of the d-q axis currents when the d-q axis current of the motor moves on a voltage limiting ellipse by automatic weakening flux control.Type: ApplicationFiled: June 22, 2015Publication date: May 3, 2018Applicant: Mitsubishi Electric CorporationInventors: Shingo HARADA, Keiichi ENOKI, Yasukazu MURATA, Masutaka WATANABE, Yoshimasa NISHIJIMA