Patents by Inventor Kazunori Hatakeyama

Kazunori Hatakeyama 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: 12212262
    Abstract: A power converting apparatus includes a converter circuit converting an alternating-current voltage output from an alternating-current power supply into a direct-current voltage. The converter circuit includes unit converters. The power converting apparatus generates a reference duty on the basis of detection values of a current detector and a voltage detector and generates, on the basis of a result of comparison between the reference duty and a carrier signal, a pulse-width modulation signal for controlling the switching element. In each of the unit converters, the pulse-width modulation signal has one pulse within a carrier period and has pulses for the number of phases within a leveling period, the leveling period being obtained by multiplying the carrier period by the number of phases. The pulses for the number of phases within the leveling period have phases all different from each other in the respective carrier periods.
    Type: Grant
    Filed: September 4, 2020
    Date of Patent: January 28, 2025
    Assignee: Mitsubishi Electric Corporation
    Inventors: Satoru Ichiki, Kazunori Hatakeyama, Koichi Arisawa
  • Publication number: 20250030370
    Abstract: A heat pump apparatus includes: an inverter that applies a high-frequency voltage to a motor that drives a compressor, the high-frequency voltage having a frequency higher than or equal to an operation frequency of the compressor; and an inverter controller that switches between positive and negative directions of an output voltage output from the inverter every half period of a carrier signal, the carrier signal being used for generating a switching signal, the switching signal controlling whether each of the switching elements is on or off. The inverter controller prohibits switching between positive and negative directions of the output voltage in a first time period, the first time period being a time period of an integer multiple of two or more times the half period of the carrier signal.
    Type: Application
    Filed: January 31, 2022
    Publication date: January 23, 2025
    Inventors: Yuichi SHIMIZU, Kazunori HATAKEYAMA
  • Publication number: 20250015740
    Abstract: A motor driving device includes an inverter that supplies alternating-current voltage to a motor whose speed is variable due to a load variation caused by a compressor, and a control device. The control device includes a frequency estimation unit estimating a frequency estimation value indicating a rotation of the motor, a speed controlling unit generating a first torque current command value based on a deviation between the frequency estimation value and a frequency command value, a load torque estimation unit estimating a load torque applied to the motor, a compensation value calculation unit calculating a torque current compensation value based on the load torque, where the torque current compensation value causes the motor to accelerate in a period including timing of the maximum load torque, and an adding unit generating a second torque current command value based on the first torque current command and torque current compensation values.
    Type: Application
    Filed: November 1, 2021
    Publication date: January 9, 2025
    Inventors: Shoei TSUTSUMI, Shinya TOYODOME, Kazunori HATAKEYAMA
  • Publication number: 20240429851
    Abstract: A motor driving device includes an inverter and a controller, and the inverter has first switching elements of an upper arm, first freewheeling diodes, second switching elements of a lower arm, and second freewheeling diodes. The controller outputs a control signal for setting all of the second switching elements of the lower arm in an ON state when an open failure of any one of the first switching elements of the upper arm is detected, and outputs a control signal for setting all of the plurality of first switching elements of the upper arm in the ON state when an open failure of any one of the second switching elements of the lower arm is detected.
    Type: Application
    Filed: November 5, 2021
    Publication date: December 26, 2024
    Inventors: Shoei TSUTSUMI, Shinya TOYODOME, Kazunori HATAKEYAMA
  • Publication number: 20240413765
    Abstract: A power conversion apparatus includes: a converter that rectifies a power-supply voltage applied from an AC power supply; a capacitor connected to an output end of the converter; an inverter connected across the capacitor; and a control device that performs vibration reduction control of reducing vibration of a compressor by controlling an operation of the inverter. The control device includes: a ?-axis current compensation unit that reduces pulsation of a capacitor output current output from the capacitor to the inverter; and a ?-axis current compensation limiting unit that limits an excitation current compensation value generated by the ?-axis current compensation unit so as to reduce a harmonic component included in a power-supply current flowing between the AC power supply and the converter.
    Type: Application
    Filed: December 10, 2021
    Publication date: December 12, 2024
    Inventors: Shinya TOYODOME, Kazunori HATAKEYAMA, Shoei TSUTSUMI
  • Publication number: 20240405710
    Abstract: A power converter includes a converter that rectifies a power supply voltage applied from an alternating current power supply, a capacitor connected to an output end of the converter, an inverter connected across the capacitor, and a controller that controls an operation of the inverter. The controller performs first control of reducing vibration of a compressor and performs second control of reducing a ripple component of a capacitor output current that is output from the capacitor to the inverter. The second control is control for causing a loss in a motor.
    Type: Application
    Filed: December 8, 2021
    Publication date: December 5, 2024
    Inventors: Shinya TOYODOME, Kazunori HATAKEYAMA, Shoei TSUTSUMI
  • Publication number: 20240396486
    Abstract: A power conversion apparatus includes a converter that rectifies a power-supply voltage applied from an AC power supply, a capacitor connected to an output end of the converter, an inverter connected across the capacitor, and a control device that controls an operation of the inverter. The control device performs a first control of reducing a pulsatile component of a capacitor output current output from the capacitor to the inverter when the load is driven. The first control is control of causing the motor to generate a loss, and the loss that the motor is caused to generate is performed by using a y-axis current.
    Type: Application
    Filed: November 26, 2021
    Publication date: November 28, 2024
    Inventors: Shinya TOYODOME, Kazunori HATAKEYAMA, Shoei TSUTSUMI
  • Publication number: 20240333134
    Abstract: A power converter including: a non-boost rectifier circuit that converts a first alternating-current voltage into a direct-current voltage; a reactor connected to the rectifier circuit; a capacitor that smooths a direct-current voltage; an inverter that is connected in parallel to the capacitor, converts the smoothed direct-current voltage into a second alternating-current voltage having desired voltage and frequency, and outputs the second alternating-current voltage to a motor; and a controller that controls an operation of the inverter. Capacitances of the reactor and the capacitor are set such that a resonance frequency of a filter circuit including the reactor and the capacitor is smaller than a first electrical angular frequency based on a voltage command when the controller controls an operation of the inverter such that the second alternating-current voltage is maximized in a range not causing overmodulation.
    Type: Application
    Filed: July 28, 2021
    Publication date: October 3, 2024
    Inventors: Atsushi TSUCHIYA, Kazunori HATAKEYAMA, Yuichi SHIMIZU
  • Patent number: 12107510
    Abstract: A power converting apparatus includes: a reactor including a first end and a second end, the first end being connected to an alternating-current power supply; a rectifier circuit connected to the second end of the reactor and including at least one switching element, the rectifier circuit converting an alternating-current voltage output from the alternating-current power supply into a direct-current voltage; and a detecting unit that detects a physical quantity indicating an operation state of the rectifier circuit, wherein the number of times of switching of the switching element is changed depending on the operation of the rectifier circuit.
    Type: Grant
    Filed: August 30, 2019
    Date of Patent: October 1, 2024
    Assignee: Mitsubishi Electric Corporation
    Inventors: Keisuke Uemura, Kazunori Hatakeyama, Koichi Arisawa
  • Patent number: 12092356
    Abstract: An air-conditioning apparatus includes an indoor unit and an outdoor unit including a compressor that compresses a refrigerant and a motor drive system that drives the compressor. The motor drive system includes an inverter that converts a DC voltage into an AC voltage, and an electric motor including three stator windings with both ends open. The electric motor operates based on the AC voltage obtained by the inverter. The motor drive system further includes a connection state switching unit that has a function to change the connection state of the three stator windings included in the electric motor, and sets the connection state to a star connection at the start of operation of the air-conditioning apparatus.
    Type: Grant
    Filed: November 6, 2019
    Date of Patent: September 17, 2024
    Assignee: Mitsubishi Electric Corporation
    Inventors: Keiichiro Shizu, Kazunori Hatakeyama, Atsushi Kawashima, Yuta Tokuda
  • Patent number: 12021468
    Abstract: A motor drive device includes a single-phase inverter that converts a direct-current voltage into an alternating-current voltage applied to a motor. The motor drive device includes a control power supply outputting power having a voltage lower than the direct-current voltage. The motor drive device includes a drive signal generation unit driven by the power. The drive signal generation unit generates drive signals driving switching elements of the inverter. The motor drive device includes a power supply switch operating so as to allow supply of the power from the control power supply to the drive signal generation unit when a rotation speed of the motor is higher than a threshold. The power supply switch operates so as to stop the supply of the power from the control power supply to the drive signal generation unit when the rotation speed is lower than the threshold.
    Type: Grant
    Filed: March 23, 2018
    Date of Patent: June 25, 2024
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yuji Takayama, Haruka Matsuo, Kazunori Hatakeyama, Tomoyuki Kamiyama, Takuya Furuyama, Masami Yorita, Takanobu Kondo
  • Patent number: 12009705
    Abstract: An electric blower includes a fan, a motor to drive the fan, a first board including at least one switching element, and a second board including a microcomputer. The motor, first board, and second board are arranged in this order in a blowing direction of the fan.
    Type: Grant
    Filed: March 23, 2018
    Date of Patent: June 11, 2024
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kazunori Hatakeyama, Yuji Takayama, Haruka Matsuo
  • Patent number: 11990846
    Abstract: A power conversion apparatus includes a converter circuit converting AC voltage output from an AC power supply into DC voltage. The converter circuit includes unit converters. The power conversion apparatus includes a low current-oriented controller the unit converters to cause current corresponding to a single phase to flow through a current detector, and a high current-oriented controller controlling operation of the unit converters based on a result of comparison between a duty command and a carrier signal, where the duty command is generated based on detection values detected by the current detector and a voltage detector. When the detection value detected by the current detector is less than or equal to a first threshold, the low current-oriented controller is activated, and when the detection value detected by the current detector is greater than the first threshold, the high current-oriented controller is activated.
    Type: Grant
    Filed: November 14, 2019
    Date of Patent: May 21, 2024
    Assignee: Mitsubishi Electric Corporation
    Inventors: Motoya Suzuki, Satoru Ichiki, Keisuke Uemura, Koichi Arisawa, Kazunori Hatakeyama
  • Patent number: 11971200
    Abstract: A heat pump apparatus includes: a compressor including a motor; an inverter that applies a desired voltage to the motor; a current detector that detects current flowing to the motor; a drive-signal generation unit that generates a drive signal for the inverter; a magnetic-pole position estimation unit that changes a voltage phase of a voltage command value for a high-frequency voltage, and estimates a maximum-heat-amount acquisition magnetic-pole position when the generation unit applies the high-frequency voltage to the motor to heat the compressor; a steady heating control unit that determines an amplitude and voltage phase of the voltage command value from the maximum-heat-amount acquisition magnetic-pole position and a defined necessary amount of heat when the generation unit applies the high-frequency voltage to the motor to heat the compressor; and a control switching determination unit that causes one of the estimation unit and the heating control unit to operate.
    Type: Grant
    Filed: January 15, 2020
    Date of Patent: April 30, 2024
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yuichi Shimizu, Kazunori Hatakeyama
  • Publication number: 20240128913
    Abstract: In a power converter, a controller controls the operation of a converter, and a control voltage generator generates a control voltage for operating the controller. When the voltage value of the direct-current voltage output from the power converter is higher than the voltage value of the control voltage and a detection signal is not output from a voltage detector that detects the power supply voltage, the operation of switching elements of the converter is stopped under the control of the controller.
    Type: Application
    Filed: March 29, 2021
    Publication date: April 18, 2024
    Inventor: Kazunori HATAKEYAMA
  • Publication number: 20240097576
    Abstract: A DC power supply device includes a rectification circuit, a reactor, a first capacitor and a second capacitor, a first switching element to set the first capacitor in a charging state when the first switching element is in an off state and to set the first capacitor in a non-charging state when the first switching element is in an on state, a second switching element to set the second capacitor in the charging state when the second switching element is in the off state and to set the second capacitor in the non-charging state when the second switching element is in the on state, and a controller. The controller has a full-wave rectification mode as an operation mode in which one of the first and second switching elements is maintained in the off state and the other one of the first and second switching elements undergoes PWM control.
    Type: Application
    Filed: February 17, 2021
    Publication date: March 21, 2024
    Inventors: Yuichi SHIMIZU, Kazunori HATAKEYAMA
  • Publication number: 20240048066
    Abstract: A power converting apparatus includes: a rectifier that rectifies alternating-current power output from an alternating-current power supply; a capacitor provided at an output end of the rectifier; a reactor provided on a path from the alternating-current power supply to the capacitor; a load connected across the capacitor; and a control unit that reduces a charging and discharging current of the capacitor by controlling an operation state of the load such that power pulsation occurs in power to be consumed by the load, wherein a range of an inductance value of the reactor is defined by use of a maximum value of an output voltage of the rectifier, a minimum value of the output voltage of the rectifier, a direct-current component of output power of the load, a number of phases of the alternating-current power supply, and an angular frequency of the alternating-current power supply.
    Type: Application
    Filed: April 19, 2021
    Publication date: February 8, 2024
    Inventors: Kazunori HATAKEYAMA, Yuji TAKAYAMA
  • Publication number: 20240048081
    Abstract: A motor drive apparatus includes a connection switching device that switches a connection state of windings of a first motor by switches; an inverter that applies an alternating-current voltage to the windings; a first control device that controls the inverter and the connection switching device; and a second control device that controls a second motor for an element that affects the first motor. Control by the first control device when switching includes a first stage of bringing an effective value of alternating current flowing through the windings close to zero compared to that before the connection state is switched; and a second stage of suspending output of the alternating-current voltage from the inverter. The second control device keeps the second motor running during the first and second stages, and the first control device switches the switches in the second stage.
    Type: Application
    Filed: February 17, 2021
    Publication date: February 8, 2024
    Inventors: Yuhei SHIMADA, Kazunori HATAKEYAMA
  • Publication number: 20240022182
    Abstract: Included are a rectifier circuit that rectifies a first alternating-current voltage; a reactor connected to the rectifier circuit; a capacitor connected to an output end of the rectifier circuit; an inverter that is connected to the capacitor, generates a second alternating-current voltage through operations of a plurality of switching elements, and applies the second alternating-current voltage to a motor including a stator and a rotor; and a control unit that performs operation controls on the plurality of switching elements. The control unit causes the inverter to apply, to the motor, the second alternating-current voltage having a higher frequency than when the motor is in compression operation so as not to rotate the rotor. The application of the high-frequency second alternating-current voltage from the inverter to the motor generates a regenerative current and a current flows to the capacitor due to the regenerative current without impairing the capacitor.
    Type: Application
    Filed: February 16, 2021
    Publication date: January 18, 2024
    Inventors: Atsushi TSUCHIYA, Kazunori HATAKEYAMA, Yuichi SHIMIZU
  • Patent number: 11874020
    Abstract: A motor drive apparatus includes a reactor, a converter connected to an alternating current power supply via the reactor, a smoothing capacitor connected between output terminals of the converter, and an inverter that converts a direct current voltage output from the smoothing capacitor into an alternating current voltage to be applied to a motor and outputs the alternating current voltage. The motor drive apparatus includes a plurality of operation modes for controlling conduction of switching elements of the converter and causing the converter to operate in different modes of operation, and changes operation of at least one of the switching elements of the converter and the inverter according to the operation mode when a bus voltage indicates an excessive value.
    Type: Grant
    Filed: August 30, 2019
    Date of Patent: January 16, 2024
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kazunori Hatakeyama, Keisuke Uemura