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公开(公告)号：US20240007012A1
公开(公告)日：2024-01-04
申请号：US18254777
申请日：2021-01-06
Applicant: Mitsubishi Electric Corporation
Inventor： Atsushi TSUCHIYA , Kazunori HATAKEYAMA , Keisuke UEMURA
Abstract: A converter for converting AC power from an AC power supply into DC power and outputting the DC power, an inverter for converting the DC power outputted from the converter into AC power of a variable frequency and a variable voltage value, and supplying the AC power to a load, a shunt resistor for detecting an output current of the converter, and a control device for controlling the inverter based on the detected output current are provided. The control device calculates an input current of the converter from the output current detected by the shunt resistor, and, when the calculated input current exceeds a predetermined threshold value, the control device causes the manner of operation of said inverter to be changed so as to reduce the input current of the converter.
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公开(公告)号：US20250062679A1
公开(公告)日：2025-02-20
申请号：US18720707
申请日：2021-12-27
Applicant: Mitsubishi Electric Corporation
Inventor： Yuki TANIYAMA , Yosuke HACHIYA , Kenta YUASA , Akane HONGYO , Yuichi SHIMIZU , Atsushi TSUCHIYA
IPC: H02M1/12 , H02M7/219 , H02M7/5387 , H02P23/14 , H02P25/024 , H02P27/08
Abstract: A power conversion apparatus includes: a rectifying unit that rectifies an AC voltage input from an AC power supply to convert the AC voltage into a DC link voltage; a capacitor that is charged with a DC link voltage converted by the rectifying unit; a power application unit that converts the DC link voltage with which the capacitor is charged into an AC voltage by switching the DC link voltage, and outputs the AC voltage to a motor; and a control unit that controls the power application unit. The control unit controls the power application unit such that a second beat is superimposed on a motor current, the second beat having a second frequency different from a first beat having a first frequency included in the motor current and having at least one of an amplitude or a phase aligned with the first beat.
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公开(公告)号：US20200021225A1
公开(公告)日：2020-01-16
申请号：US16334379
申请日：2016-10-31
Applicant: Mitsubishi Electric Corporation
Inventor： Keisuke UEMURA , Takashi YAMAKAWA , Kenji IWAZAKI , Koichi ARISAWA , Atsushi TSUCHIYA
Abstract: A motor driving device that is a device for driving a motor including stator windings, includes: a connection switching unit that includes relays as mechanical switches connected to the stator windings and excitation coils opening or closing the relays by being energized or non-energized with excitation current and switches connection condition of the stator windings to either of first connection condition (star connection) and second connection condition (delta connection) different from the first connection condition by opening or closing the relays; and an inverter that supplies AC drive voltages to the stator windings.
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公开(公告)号：US20210184618A1
公开(公告)日：2021-06-17
申请号：US17056508
申请日：2018-06-14
Applicant: Mitsubishi Electric Corporation
Inventor： Atsushi TSUCHIYA , Keisuke UEMURA , Kazunori HATAKEYAMA , Yuichi SHIMIZU
IPC: H02P29/024 , H02P27/08 , F24F11/88
Abstract: A motor driving device includes an inverter to supply an alternating current, a switch unit that switches the number of at least one permanent magnet synchronous motor to which the alternating current is supplied from the inverter, a detector to detect a detection value corresponding to the alternating current supplied to the at least one permanent magnet synchronous motor, and a control device to control the inverter and the switch unit. The control device sets an overcurrent interruption threshold value at a value based on the number. When the detection value is greater than or equal to the overcurrent interruption threshold value, the control device makes the inverter stop the supplying of the alternating current to the at least one permanent magnet synchronous motor.
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公开(公告)号：US20240333134A1
公开(公告)日：2024-10-03
申请号：US18563425
申请日：2021-07-28
Applicant: Mitsubishi Electric Corporation
Inventor： Atsushi TSUCHIYA , Kazunori HATAKEYAMA , Yuichi SHIMIZU
IPC: H02M1/12 , H02M7/5388 , H02P27/08
CPC classification number: H02M1/126 , H02M7/5388 , H02P27/085
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.
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Patent Agency Ranking
公开(公告)号：US20210359634A1
公开(公告)日：2021-11-18
申请号：US17281043
申请日：2018-11-07
Applicant: Mitsubishi Electric Corporation
Inventor： Atsushi TSUCHIYA , Keisuke UEMURA , Kazunori HATAKEYAMA
IPC: H02P27/08 , H02M7/5387
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.
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公开(公告)号：US20200018534A1
公开(公告)日：2020-01-16
申请号：US16327995
申请日：2016-10-31
Applicant: Mitsubishi Electric Corporation
Inventor： Atsushi TSUCHIYA , Takashi YAMAKAWA , Kenji IWAZAKI , Keisuke UEMURA , Koichi ARISAWA
Abstract: A motor driving device and an air conditioner are capable of increasing the efficiency in a low speed region in which a motor performs low speed rotation. The motor driving device that is a motor driving device for driving a motor including stator windings, includes: a connection switching unit that switches connection condition of the stator windings to either of first connection condition and second connection condition different from the first connection condition; and an inverter that converts a DC voltage into AC drive voltages and supplies the AC drive voltages to the stator windings. The inverter includes MOS transistors as switching elements.
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公开(公告)号：US20240022182A1
公开(公告)日：2024-01-18
申请号：US18256077
申请日：2021-02-16
Applicant: Mitsubishi Electric Corporation
Inventor： Atsushi TSUCHIYA , Kazunori HATAKEYAMA , Yuichi SHIMIZU
IPC: H02M7/5387 , H02M1/42 , H02P27/08 , H02P23/26
CPC classification number: H02M7/53873 , H02M1/4216 , H02P27/08 , H02P23/26
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.
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公开(公告)号：US20220060133A1
公开(公告)日：2022-02-24
申请号：US17435226
申请日：2019-03-06
Applicant: Mitsubishi Electric Corporation
Inventor： Atsushi TSUCHIYA , Kazunori HATAKEYAMA , Shinya TOYODOME
IPC: H02P25/18 , H02P27/08 , H02P6/10 , H02P29/024
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.
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10.发明申请公开(公告)号：US20220006410A1
公开(公告)日：2022-01-06
申请号：US17294015
申请日：2018-12-19
Applicant: Mitsubishi Electric Corporation
Inventor： Atsushi TSUCHIYA , Kazunori HATAKEYAMA , Shinya TOYODOME
IPC: H02P25/18 , H02P27/08 , H02M7/5387 , F25B31/02
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.
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