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).

  • Publication number: 20230283219
    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: Application
    Filed: September 4, 2020
    Publication date: September 7, 2023
    Inventors: Satoru ICHIKI, Kazunori HATAKEYAMA, Koichi ARISAWA
  • Publication number: 20230145142
    Abstract: A motor driver for driving a motor including three-phase windings includes: an inverter that applies a desired voltage to the motor; and an inverter controller that controls an operation of the inverter. The inverter includes: a current detector that detects a direct current in a first connecting line among three-phase connecting lines connecting the respective three-phase windings and the inverter; and a current detector that detects an alternating current in a second connecting line among the three-phase connecting lines, and a maximum direct current is caused to flow to the first connecting line in a first control mode for positioning a rotor of the motor.
    Type: Application
    Filed: June 16, 2020
    Publication date: May 11, 2023
    Inventors: Yuichi SHIMIZU, Kazunori HATAKEYAMA
  • Patent number: 11632068
    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: Grant
    Filed: March 6, 2019
    Date of Patent: April 18, 2023
    Assignee: Mitsubishi Electric Corporation
    Inventors: Atsushi Tsuchiya, Kazunori Hatakeyama, Shinya Toyodome
  • Patent number: 11632071
    Abstract: A motor drive device that drives motors with one inverter includes a step-out control unit that detects step-out in which the operating frequency of at least one of the motors does not match the inverter output frequency, or the operating frequency of at least one of the motors does not match the operating frequency of another one of the motors, and stops the motors by switching an energization state of the inverter when at least one of the motors is out of step.
    Type: Grant
    Filed: February 27, 2020
    Date of Patent: April 18, 2023
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yuichi Shimizu, Kazunori Hatakeyama
  • Publication number: 20230092110
    Abstract: A power converter for converting a voltage of direct-current power output from a direct-current power supply, the power converter including: a printed circuit board; a reactor being configured with a conductor pattern of the printed circuit board; a semiconductor element that is connected to another end of the reactor and performs switching for storing electrical energy in the reactor so as to boost the voltage of the direct-current power from a first voltage to a second voltage; a capacitor that smooths the direct-current power boosted to the second voltage; a diode that is connected to the another end of the reactor and supplies the direct-current power boosted to the second voltage to the capacitor; and a cooler, wherein the reactor, the semiconductor element, and the diode are included in a module in a single package, and the module is cooled by the cooler.
    Type: Application
    Filed: April 25, 2020
    Publication date: March 23, 2023
    Inventors: Satoru ICHIKI, Koichi ARISAWA, Kazunori HATAKEYAMA, Takahiko KOBAYASHI
  • Patent number: 11611306
    Abstract: A motor driving apparatus for driving a single-phase motor includes an inverter disposed between a battery and the single-phase motor, the inverter applying a first voltage to the single-phase motor at startup and applying a second voltage to the single-phase motor during a normal operation. A stop time period is present after application of the first voltage, application of the first voltage being stopped during the stop time period, and the inverter applies the second voltage after a lapse of the stop time period.
    Type: Grant
    Filed: April 11, 2019
    Date of Patent: March 21, 2023
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yuji Takayama, Haruka Matsuo, Kazunori Hatakeyama
  • Patent number: 11601076
    Abstract: In a motor driving apparatus having an inverter which can drive n (n being an integer not smaller than 2) motors each having a permanent magnet in its rotor, and a connection switching device for switching the connection state of the n motors, the connection switching device is operated to change the number of the motors connected to the inverter thereby to change the impedance as seen from the inverter towards the motors. When i (i being any of 2 to n) motors among the n motors are concurrently driven by the inverter, the voltage outputted by the inverter may be controlled such that the inductance values of the i motors are identical. It is possible to prevent hunting and step-out due to the phase difference between the motors driven by the inverter.
    Type: Grant
    Filed: February 28, 2018
    Date of Patent: March 7, 2023
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kazunori Hatakeyama, Keisuke Uemura, Yuichi Shimizu
  • Patent number: 11594993
    Abstract: A controller includes: a connection switch that switches a connection state of a winding of a synchronous motor during a rotating operation of the synchronous motor; a current detector that detects a rotary machine current flowing in the synchronous motor; a position/speed estimator that estimates a magnetic pole position and speed of a rotor; a voltage applicator that applies a voltage to the synchronous motor; and a control circuitry that generates a voltage command given to the voltage applicator on the basis of the magnetic pole position and the speed, and outputs a switching operation command for switching the connection state to the connection switch. The control circuitry generates the voltage command to bring the rotary machine current close to zero before the connection state of the winding is switched.
    Type: Grant
    Filed: July 18, 2018
    Date of Patent: February 28, 2023
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Akane Hongyo, Kenji Takahashi, Kazunori Hatakeyama, Akira Satake
  • Publication number: 20220412612
    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: Application
    Filed: January 15, 2020
    Publication date: December 29, 2022
    Inventors: Yuichi SHIMIZU, Kazunori HATAKEYAMA
  • Patent number: 11506437
    Abstract: A refrigerating cycle device includes a compressor, a motor, and a wiring switch part. The compressor compresses a refrigerant. The motor generates power for compressing the refrigerant by rotating a rotor with voltage applied to a plurality of wirings. The motor is disposed in the compressor. The wiring switch part switches between a plurality of wiring states by changing connection between the plurality of wirings. When a rotational speed of the rotor exceeds a predetermined value, the wiring switch part switches to a first wiring state of the plurality of wiring states. The first wiring state differs from a second wiring state of the plurality of wiring state. Efficiency of the second wiring state is highest at the rotational speed.
    Type: Grant
    Filed: April 25, 2018
    Date of Patent: November 22, 2022
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takumi Nishiyama, Koichi Arisawa, Masahiro Nigo, Kazunori Hatakeyama
  • Publication number: 20220360192
    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: Application
    Filed: August 30, 2019
    Publication date: November 10, 2022
    Inventors: Keisuke UEMURA, Kazunori HATAKEYAMA, Koichi ARISAWA
  • Publication number: 20220349407
    Abstract: The power conversion apparatus includes a converter circuit that converts an alternating-current voltage output from an alternating-current power supply into a direct-current voltage. The converter circuit includes unit converters. The power conversion apparatus includes current detectors that detect respective currents flowing through respective reactors. In first and second unit converters adjacent to each other among the unit converters, a phase difference between a first phase and a second phase is changed from a reference phase difference when a total current of currents detected by the respective current detectors is greater than a threshold. The first phase is a phase at a time when the switching element of the first unit converter is turned on. The second phase is a phase at a time when the switching element of the second unit converter is turned on.
    Type: Application
    Filed: November 14, 2019
    Publication date: November 3, 2022
    Inventors: Motoya SUZUKI, Satoru ICHIKI, Keisuke UEMURA, Koichi ARISAWA, Kazunori HATAKEYAMA
  • Publication number: 20220345050
    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: Application
    Filed: November 14, 2019
    Publication date: October 27, 2022
    Inventors: Motoya SUZUKI, Satoru ICHIKI, Keisuke UEMURA, Koichi ARISAWA, Kazunori HATAKEYAMA
  • Patent number: 11473789
    Abstract: An outdoor unit includes at least one heat exchanger, a first motor including a first fan, a second motor including a second fan, an inverter that applies voltage to the first motor and the second for respectively, a connection switching unit that switches the voltage applied to the second motor between on and off, and a control unit that controls the inverter and the connection switching unit. The inverter is disposed closer to the first motor than to the second motor.
    Type: Grant
    Filed: May 31, 2018
    Date of Patent: October 18, 2022
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yuji Takayama, Kazunori Hatakeyama, Yuichi Shimizu, Keisuke Uemura
  • Publication number: 20220316748
    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: Application
    Filed: November 6, 2019
    Publication date: October 6, 2022
    Inventors: Keiichiro SHIZU, Kazunori HATAKEYAMA, Atsushi KAWASHIMA, Yuta TOKUDA
  • Publication number: 20220286060
    Abstract: An air conditioner has a power conversion device including: a reactor having a first end and a second end, the first end being connected to an AC power supply; a rectifier circuit that is connected to the second end of the reactor and includes a diode and at least one or more switching elements, the rectifier circuit converting an AC voltage outputted from the AC power supply into a DC voltage; and a detection unit detecting a physical quantity indicating an operation state of the rectifier circuit. Switching is made between control for a current from the AC power supply to be applied to the diode or control for the current to be applied to the switching element in accordance with an operating mode of the air conditioner.
    Type: Application
    Filed: August 30, 2019
    Publication date: September 8, 2022
    Inventors: Keisuke UEMURA, Kazunori HATAKEYAMA, Koichi ARISAWA
  • Patent number: 11431271
    Abstract: An electric motor drive device includes: a wire connection switching unit; an inverter; a control device controlling the wire connection switching unit and the inverter; and an overcurrent protection circuit preventing current exceeding a predetermined value from continuously flowing through the electric motor. The overcurrent protection circuit includes: determination circuits each correlated one-to-one with any one of possible wire connection states of a stator winding and determining whether current flowing through the inverter is abnormal; a combining circuit combining determination results; and an invalidation circuit invalidating a determination process by one or more of the determination circuits, and causing the combining circuit to output a determination result by the determination circuit correlated with a selected wire connection state of the stator winding.
    Type: Grant
    Filed: October 24, 2017
    Date of Patent: August 30, 2022
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hiroyuki Takayama, Kazunori Hatakeyama, Keiichiro Shizu
  • Publication number: 20220255486
    Abstract: A direct current power supply device 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; an inrush current preventing circuit disposed on a charging path from the alternating current power supply to the smoothing capacitor; a current detection unit detecting direct current representing an operating state on an output side of the converter; a current detection unit detecting power supply current representing an operating state on an input side of the converter; and a control unit receiving the direct current and the power supply current and controlling an operation of the converter. The control unit receives a detected value of saturated current from at least one of the direct current and the power supply current when the power supply voltage recovers from a state in which the power supply voltage is reduced.
    Type: Application
    Filed: August 30, 2019
    Publication date: August 11, 2022
    Inventors: Kazunori HATAKEYAMA, Keisuke UEMURA
  • Publication number: 20220252283
    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: Application
    Filed: August 30, 2019
    Publication date: August 11, 2022
    Inventors: Kazunori HATAKEYAMA, Keisuke UEMURA
  • Patent number: 11374525
    Abstract: A motor driving apparatus for driving a motor, the apparatus being connected to the motor by first, second, and third connection lines respectively corresponding to first, second, and third phases, the apparatus including: an inverter converting direct-current voltage into three-phase alternating-current voltage by using first, second, and third switching element pairs respectively connected to the first, second, and third connection lines, and outputting the three-phase alternating-current voltage to the motor; a voltage detection circuit detecting a first voltage based on a potential difference between a potential of the first connection line and a reference potential; and a control unit calculating a voltage value of the direct-current voltage based on the first voltage during a first period in which an upper-arm switching element of the first switching element pair is on, controlling operation of the inverter according to the voltage value, and changing the first period according to the voltage value.
    Type: Grant
    Filed: November 7, 2018
    Date of Patent: June 28, 2022
    Assignee: Mitsubishi Electric Corporation
    Inventors: Atsushi Tsuchiya, Keisuke Uemura, Kazunori Hatakeyama