Patents by Inventor Shinya TOYODOME

Shinya TOYODOME 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: 20220294377
    Abstract: An estimation device includes a phase current determination unit, a time difference calculation unit, and an estimation unit. The phase current determination unit performs a determination process for determining values of phase currents based on the value of the bus current detected by a bus current detection unit and states of gate pulse signals. The time difference calculation unit calculates a difference between a detection time of the bus current used in a previous determination process and a detection time of the bus current used in a present determination process. The estimation unit estimates at least one of a position and a speed of an AC motor based on the values of the phase currents determined by the phase current determination unit and the difference calculated by the time difference calculation unit.
    Type: Application
    Filed: August 23, 2019
    Publication date: September 15, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventors: Kenji TAKAHASHI, Shinya TOYODOME, Mitsuo KASHIMA, Tomohiro KUTSUKI
  • Publication number: 20220200498
    Abstract: A motor drive device: a power conversion unit; a current detection unit that detects a phase current of the alternating-current motor; a position/speed specifying unit that specifies a magnetic pole position and a rotational speed of the alternating-current motor; a d-axis current pulsation generating unit that generates a d-axis current pulsation command based on q-axis current pulsation or a q-axis current pulsation command, which being in synchronization with the q-axis current pulsation or the q-axis current pulsation command and preventing or reducing an increase or decrease in amplitude of the voltage command; and a dq-axis current control unit that generates the voltage command for controlling the phase current on the dq rotating coordinates, which rotate in synchronization with the magnetic pole position, by using the magnetic pole position, the rotational speed, the phase current, the q-axis current pulsation or the q-axis current pulsation command, and the d-axis current pulsation command.
    Type: Application
    Filed: May 20, 2019
    Publication date: June 23, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventors: Kenji TAKAHASHI, Shinya TOYODOME, Mitsuo KASHIMA, Tomohiro KUTSUKI
  • Publication number: 20220149764
    Abstract: A speed estimating device for an AC motor includes: a model deviation computing unit computing a model deviation based on a voltage, a current, and an estimated angular velocity of the AC motor; a first angular velocity estimating unit computing a first estimated angular velocity based on the model deviation; a second angular velocity estimating unit computing a second estimated angular velocity differing from the first estimated angular velocity in frequency, based on the model deviation; a compensation phase computing unit computing a compensation phase based on a disturbance frequency; and an estimated angular velocity calculator computing an estimated angular velocity of the AC motor based on the first estimated angular velocity and the second estimated angular velocity. Either one of the first estimated angular velocity and the second estimated angular velocity is computed based on the compensation phase.
    Type: Application
    Filed: March 22, 2019
    Publication date: May 12, 2022
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yuriko TAKEDA, Kenji TAKAHASHI, Shinya TOYODOME, Mitsuo KASHIMA, Tomohiro KUTSUKI
  • Patent number: 11329587
    Abstract: The motor driving apparatus includes a switch that is a mechanical switch for changing coil connection states of a motor; an inverter that generates alternating voltage from direct voltage and outputs the alternating voltage to the motor; and a control device that controls the switch and the inverter. The control device causes the switch to change the coil connection states while the alternating voltage output from the inverter is zero.
    Type: Grant
    Filed: December 19, 2018
    Date of Patent: May 10, 2022
    Assignee: Mitsubishi Electric Corporation
    Inventors: Atsushi Tsuchiya, Kazunori Hatakeyama, Shinya Toyodome
  • Publication number: 20220115973
    Abstract: An inverter for driving a motor that has a switchable connection of windings and drives a load element having a periodically varying load torque is provided. The inverter is controlled so that an output torque of the motor follows the periodic variation of the load torque. The inverter is controlled so that a current flowing through the motor is zero during a period including a minimum torque phase at which the load torque is at or near a minimum value. The connection is switched while the current flowing through the motor is zero. It is possible to switch the connection of the windings while the motor is rotating, and avoid an increase in apparatus size.
    Type: Application
    Filed: February 21, 2019
    Publication date: April 14, 2022
    Inventors: Shinya TOYODOME, Kazunori HATAKEYAMA, Kenji TAKAHASHI
  • Publication number: 20220060133
    Abstract: A motor driving device includes: a connection switcher that has an electromagnetic contactor connected to a winding of a motor and switches connection condition of the winding by switching condition of the electromagnetic contactor; an inverter to apply an output voltage as an AC voltage to the winding via the connection switcher; a short-circuiting circuit having a rectification circuit and a switch; and a controller to control the electromagnetic contactor, the inverter and the switch, wherein a circulating circuit is formed by the short-circuiting circuit and the winding when the switch is set at ON, and the connection switcher switches the connection condition of the winding in a period in which the output voltage of the inverter is set at zero in a rotating operation of the motor and a current caused by the rotating operation circulates in the circulating circuit.
    Type: Application
    Filed: March 6, 2019
    Publication date: February 24, 2022
    Inventors: Atsushi TSUCHIYA, Kazunori HATAKEYAMA, Shinya TOYODOME
  • Publication number: 20220006410
    Abstract: The motor driving apparatus includes a switch that is a mechanical switch for changing coil connection states of a motor; an inverter that generates alternating voltage from direct voltage and outputs the alternating voltage to the motor; and a control device that controls the switch and the inverter. The control device causes the switch to change the coil connection states while the alternating voltage output from the inverter is zero.
    Type: Application
    Filed: December 19, 2018
    Publication date: January 6, 2022
    Inventors: Atsushi TSUCHIYA, Kazunori HATAKEYAMA, Shinya TOYODOME
  • Patent number: 11201576
    Abstract: In a motor driving apparatus including a DC power supply circuit of variable output voltage value, an inverter of variable frequency, and a connection switching device for selecting connection, switching of the connection switching device is performed in a state where an output voltage of the DC power supply circuit is increased, a rotational speed of a motor is increased, and a current flowing through the motor is made not greater than a predetermined threshold. For example, the switching of the connection switching device is performed in a state where the current through the motor is made zero. For example, the switching is performed in a state where the output voltage of the DC power supply circuit is set at a value corresponding to the rotational speed of the motor during the switching. It is possible to prevent increase in apparatus size and switch the connection of windings while the motor is rotating.
    Type: Grant
    Filed: July 26, 2018
    Date of Patent: December 14, 2021
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shinya Toyodome, Kazunori Hatakeyama
  • Patent number: 11101728
    Abstract: A power converting apparatus includes: a boost circuit including a reactor supplied with first voltage output from an alternating-current power supply, a first leg including first upper-arm and lower-arm switching elements connected in series, and a second leg connected in parallel with the first leg and including second upper-arm and lower-arm switching elements connected in series, and boosting the first voltage; a first voltage detecting unit detecting the first voltage; a smoothing capacitor smoothing voltage output from the boost circuit; and a second voltage detecting unit detecting second voltage smoothed by the smoothing capacitor. When the second voltage is larger than the first voltage and is lower than or equal to twice the first voltage, a width of a second drive pulse to turn on the first upper-arm switching element is larger than a width of a first drive pulse to turn on the first lower-arm switching element.
    Type: Grant
    Filed: June 26, 2017
    Date of Patent: August 24, 2021
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shinya Toyodome, Takashi Yamakawa, Shigeo Umehara
  • Publication number: 20210257948
    Abstract: In a motor driving apparatus including a DC power supply circuit of variable output voltage value, an inverter of variable frequency, and a connection switching device for selecting connection, switching of the connection switching device is performed in a state where an output voltage of the DC power supply circuit is increased, a rotational speed of a motor is increased, and a current flowing through the motor is made not greater than a predetermined threshold. For example, the switching of the connection switching device is performed in a state where the current through the motor is made zero. For example, the switching is performed in a state where the output voltage of the DC power supply circuit is set at a value corresponding to the rotational speed of the motor during the switching. It is possible to prevent increase in apparatus size and switch the connection of windings while the motor is rotating.
    Type: Application
    Filed: July 26, 2018
    Publication date: August 19, 2021
    Inventors: Shinya TOYODOME, Kazunori HATAKEYAMA
  • Publication number: 20210203256
    Abstract: There are provided an inverter connected to n (n being as integer not less than 2) motors each including a rotor having a permanent magnet and capable of driving the n motors, and a connection switching device to switch a connection state of at least one motor of the n motors and the inverter between connection and disconnection. While the n motors are connected to the inverter and driven by the inverter, when an abnormality is detected in the at least one motor, the connection switching device switches the connection state to the disconnection and the inverter drives the n motors except the at least one motor.
    Type: Application
    Filed: June 18, 2018
    Publication date: July 1, 2021
    Inventors: Shinya TOYODOME, Kazunori HATAKEYAMA, Yuichi SHIMIZU
  • Patent number: 11005404
    Abstract: In a motor driving apparatus having an inverter for driving a motor capable of switching between a star connection and a delta connection, when currents detected by winding current detecting elements detecting currents flowing through windings become excessive, the inverter is made to stop. Moreover, inverter output currents are calculated after removing a circulating current component at the time of the delta connection, from the winding currents detected by the winding current detecting elements, and the inverter is controlled using the calculated inverter output currents. Because over-current protection is performed based on the detected values of the winding currents, it is possible to prevent demagnetization taking account oSf the circulating current. Also, the inverter control is prevented from being affected by the circulating current in the delta connection. Accordingly, it is possible to reduce the number of the current detecting elements, and perform the over-current protection and control properly.
    Type: Grant
    Filed: October 31, 2016
    Date of Patent: May 11, 2021
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shinya Toyodome, Takashi Yamakawa, Koichi Arisawa, Keisuke Uemura, Kenji Iwazaki
  • Patent number: 11005410
    Abstract: An over-current protection circuit for a motor capable of selecting one of a plurality of connection states has a plurality of decision circuits, a combining circuit, and a nullifying circuit. The combining circuit combines results of the comparisons in the plurality of decision circuits. The nullifying circuit nullifies part of the comparisons in the plurality of decision circuits. The number of outputs of the over-current protection circuit is one, so that for controlling the driving and stopping of the inverter needs just one terminal is required for receiving the output of the combining circuit. Moreover, because the over-current protection circuit is formed of hardware, the protection can be performed at a high speed.
    Type: Grant
    Filed: October 31, 2016
    Date of Patent: May 11, 2021
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kenji Iwazaki, Koichi Arisawa, Takashi Yamakawa, Keisuke Uemura, Shinya Toyodome
  • Publication number: 20210119565
    Abstract: An over-current protection circuit for a motor capable of selecting one of a plurality of connection states has a plurality of decision circuits, a combining circuit, and a nullifying circuit. The combining circuit combines results of the comparisons in the plurality of decision circuits. The nullifying circuit nullifies part of the comparisons in the plurality of decision circuits. The number of outputs of the over-current protection circuit is one, so that for controlling the driving and stopping of the inverter needs just one terminal is required for receiving the output of the combining circuit. Moreover, because the over-current protection circuit is formed of hardware, the protection can be performed at a high speed.
    Type: Application
    Filed: December 28, 2020
    Publication date: April 22, 2021
    Inventors: Kenji Iwazaki, Koichi Arisawa, Takashi Yamakawa, Keisuke Uemura, Shinya Toyodome
  • Patent number: 10756666
    Abstract: An electric-motor driving apparatus according to the present invention is the electric-motor driving apparatus that drives an electric motor having a winding structure in which a first multi-phase winding and a second multi-phase winding are wound and includes a first DC/AC converter connected to the first multi-phase winding and applying a multi-phase alternating-current voltage to the electric motor, a second DC/AC converter connected to the second multi-phase winding and applying a multi-phase alternating-current voltage to the electric motor, a first three-phase switching unit to perform connecting and disconnecting between phases of the first multi-phase winding, a second three-phase switching unit to perform connecting and disconnecting between phases of the second multi-phase winding, and a winding switching unit to perform connecting and disconnecting between the first multi-phase winding and the second multi-phase winding.
    Type: Grant
    Filed: October 13, 2016
    Date of Patent: August 25, 2020
    Assignee: Mitsubishi Electric Corporation
    Inventors: Koichi Arisawa, Shinya Toyodome, Shigeo Umehara
  • Patent number: 10686397
    Abstract: A motor system according to the present invention includes: a motor including a first winding portion and a second winding portion, the second winding portion having a larger number of turns than the first winding portion; a first inverter connected to the first winding portion; and a second inverter connected to the second winding portion.
    Type: Grant
    Filed: June 17, 2016
    Date of Patent: June 16, 2020
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shigeo Umehara, Koichi Arisawa, Yosuke Shinomoto, Takashi Yamakawa, Shinya Toyodome
  • Publication number: 20200127554
    Abstract: A power converting apparatus includes: a boost circuit including a reactor supplied with first voltage output from an alternating-current power supply, a first leg including first upper-arm and lower-arm switching elements connected in series, and a second leg connected in parallel with the first leg and including second upper-arm and lower-arm switching elements connected in series, and boosting the first voltage; a first voltage detecting unit detecting the first voltage; a smoothing capacitor smoothing voltage output from the boost circuit; and a second voltage detecting unit detecting second voltage smoothed by the smoothing capacitor. When the second voltage is larger than the first voltage and is lower than or equal to twice the first voltage, a width of a second drive pulse to turn on the first upper-arm switching element is larger than a width of a first drive pulse to turn on the first lower-arm switching element.
    Type: Application
    Filed: June 26, 2017
    Publication date: April 23, 2020
    Inventors: Shinya TOYODOME, Takashi YAMAKAWA, Shigeo UMEHARA
  • Publication number: 20200021231
    Abstract: An air conditioner includes a compressor to compress a refrigerant used in a refrigeration cycle, a converter to generate a DC voltage, an inverter to generate three-phase AC voltages from the DC voltage, a motor to produce a driving force for driving the compressor with a plurality of coils, the three-phase AC voltages being applied to the coils, a connection switching unit to switch connection states of the coils between a first connection state and a second connection state, and a controller to detect an abnormality of the connection switching unit.
    Type: Application
    Filed: October 31, 2016
    Publication date: January 16, 2020
    Inventors: Takashi YAMAKAWA, Koichi ARISAWA, Kenji IWAZAKI, Keisuke UEMURA, Shinya TOYODOME
  • Publication number: 20200021232
    Abstract: An over-current protection circuit for a motor capable of selecting one of a plurality of connection states has a plurality of decision circuits, a combining circuit, and a nullifying circuit. The combining circuit combines results of the comparisons in the plurality of decision circuits. The nullifying circuit nullifies part of the comparisons in the plurality of decision circuits. The number of outputs of the over-current protection circuit is one, so that for controlling the driving and stopping of the inverter needs just one terminal is required for receiving the output of the combining circuit. Moreover, because the over-current protection circuit is formed of hardware, the protection can be performed at a high speed.
    Type: Application
    Filed: October 31, 2016
    Publication date: January 16, 2020
    Inventors: Kenji IWAZAKI, Koichi ARISAWA, Takashi YAMAKAWA, Keisuke UEMURA, Shinya TOYODOME
  • Publication number: 20190348941
    Abstract: An electric-motor driving apparatus is used to drive an electric motor including a plurality of winding groups constituting a three-phase winding. The electric-motor driving apparatus includes a switch that switches connection of windings of a first winding group and a second winding group, an inverter that drives an electric motor, and a controller that controls the inverter and the switch.
    Type: Application
    Filed: November 24, 2016
    Publication date: November 14, 2019
    Inventors: Koichi ARISAWA, Shinya TOYODOME, Shigeo UMEHARA