公开(公告)号：US20220149764A1

公开(公告)日：2022-05-12

申请号：US17429363

申请日：2019-03-22

Applicant: Mitsubishi Electric Corporation

Inventor： Yuriko TAKEDA ,  Kenji TAKAHASHI ,  Shinya TOYODOME ,  Mitsuo KASHIMA ,  Tomohiro KUTSUKI

IPC: H02P21/18 ,  H02P21/05 ,  H02P21/24 ,  F25B49/02 ,  H02P21/00 ,  H02P21/13

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.

公开(公告)号：US20190145668A1

公开(公告)日：2019-05-16

申请号：US16098313

申请日：2017-04-18

Applicant: Mitsubishi Electric Corporation

Inventor： Kenji TAKAHASHI ,  Koichi ARISAWA ,  Mitsuo KASHIMA

IPC: F25B1/04 ,  G05B11/38 ,  H02P23/12 ,  G05B11/40 ,  G05B11/42

Abstract: A speed estimation apparatus for an AC motor includes a model deviation calculation unit, first and second angular velocity estimation units, and an adder. The deviation calculation unit calculates a model deviation based on a voltage, a current, and an estimated angular velocity of the motor. The first angular velocity estimation unit calculates a first estimated angular velocity as a low-frequency component including a DC component of a real angular velocity based on the model deviation. The second angular velocity estimation unit calculates a second estimated angular velocity as a high-frequency component of a real angular velocity based on a specific high-frequency component of the model deviation. The adder adds the first and second estimated angular velocities together. An addition value of the first and second estimated angular velocities is fed back as the estimated angular velocity to the deviation calculation unit.

公开(公告)号：US20170272006A1

公开(公告)日：2017-09-21

申请号：US15505370

申请日：2014-09-05

Applicant: Mitsubishi Electric Corporation

Inventor： Keisuke UEMURA ,  Kazunori HATAKEYAMA ,  Yosuke SHINOMOTO ,  Mitsuo KASHIMA ,  Takashi MATSUMOTO

IPC: H02M7/5387 ,  F25D29/00 ,  F25D17/06 ,  F25B49/02 ,  H02P5/74 ,  H02M1/08

Abstract: A power conversion apparatus includes: an inverter to drive a motor, using a first carrier signal; an inverter connected in parallel to the inverter, to drive a motor, using a second carrier signal; respective phase lower arm shunt resistors to detect a first current flowing inside the inverter; respective phase lower arm shunt resistors to detect a second current flowing in the inverter; and a control unit to control the inverters. A phase difference is set between the first carrier signal and the second carrier signal to prevent a detection period for the first current in the first carrier signal and a detection period for the second current in the second carrier signal from overlapping each other when the inverters are controlled.

公开(公告)号：US20220200498A1

公开(公告)日：2022-06-23

申请号：US17604769

申请日：2019-05-20

Applicant: Mitsubishi Electric Corporation

Inventor： Kenji TAKAHASHI ,  Shinya TOYODOME ,  Mitsuo KASHIMA ,  Tomohiro KUTSUKI

IPC: H02P21/22 ,  H02P21/14 ,  F25B49/02

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.

公开(公告)号：US20210242800A1

公开(公告)日：2021-08-05

申请号：US17269673

申请日：2018-09-21

Applicant: Mitsubishi Electric Corporation

Inventor： Shigeya OKADA ,  Mitsuo KASHIMA

IPC: H02M7/5387 ,  B62D5/04 ,  H02M7/5395

Abstract: It provides an inverter main circuit converting a DC-voltage into three-phase AC-voltages, a DC-current detection unit detecting the DC-current value of a DC-current flowing in the main circuit, and an inverter control unit generating a drive signal for controlling operation of the main circuit using a voltage command value corresponding to each phase of the three-phase AC-voltages and a triangular-wave carrier. Using a time period during which the triangular-wave carrier monotonically increases or decreases as a unit period, the control unit provides control to alternately use, as the DC-current value for use in computation of the voltage command value, the DC-current value detected in the unit period in which the triangular-wave carrier monotonically increases and the DC-current value detected in the unit period in which the triangular-wave carrier monotonically decreases, for every voltage command value control period set to three times or more and an integer multiple of the unit period.

公开(公告)号：US20180091079A1

公开(公告)日：2018-03-29

申请号：US15565227

申请日：2015-08-04

Applicant: Mitsubishi Electric Corporation

Inventor： Mitsuo KASHIMA ,  Shigeo UMEHARA

IPC: H02P21/22 ,  H02M7/5395 ,  H02P5/74 ,  H02P25/022 ,  F25B49/02

CPC classification number: H02P21/22 ,  F25B49/025 ,  F25B2600/021 ,  H02M7/5395 ,  H02P5/74 ,  H02P21/0021 ,  H02P25/022

Abstract: An inverter control device includes an inverter main circuit, a current detector, a voltage detector that detects a DC voltage between DC bus lines, and an inverter control unit that generates PWM signals to perform on/off control of a plurality of semiconductor switching elements respectively with a DC current and a DC voltage. The unit sets a carrier period of PWM signals to be 1/N times a calculation period in which the PWM signals are generated, performs detection of a DC current detected by the current detector in a 1/2 calculation period immediately before a calculation start timing for generating PWM signals, calculates an output voltage vector based on the detected DC current, and reflects PWM signals generated from the output voltage vector in one calculation period from a 1/2 calculation period after the calculation start timing to 3/2 control calculation periods after the same.

公开(公告)号：US20220294377A1

公开(公告)日：2022-09-15

申请号：US17625096

申请日：2019-08-23

Applicant: Mitsubishi Electric Corporation

Inventor： Kenji TAKAHASHI ,  Shinya TOYODOME ,  Mitsuo KASHIMA ,  Tomohiro KUTSUKI

IPC: H02P21/18 ,  H02P21/24

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.

公开(公告)号：US20190334456A1

公开(公告)日：2019-10-31

申请号：US16089186

申请日：2016-09-02

Applicant: Mitsubishi Electric Corporation

Inventor： Mitsuo KASHIMA

IPC: H02M7/5387 ,  H02M1/08 ,  H02P27/08 ,  F25B31/02

Abstract: There are included an inverter main circuit which converts DC power into three-phase AC power by using a plurality of semiconductor switching elements, a DC current detection circuit which detects a current flowing through the DC bus bar, and an inverter control unit which outputs PWM drive signals for controlling the inverter main circuit based on a detected DC current. A wide band gap semiconductor element is used as each of the semiconductor switching elements, and a parasitic diode of the wide band gap semiconductor element is used as a reflux diode. When it is defined that a short-circuit prevention time for preventing short-circuit between the upper arm switching element and the lower arm switching element be td, a semiconductor switching element is set in which a reverse recovery time trr of the parasitic diode has characteristics of (td/100)≤trr≤(td/10).

公开(公告)号：US20180208023A1

公开(公告)日：2018-07-26

申请号：US15744923

申请日：2015-08-04

Applicant: Mitsubishi Electric Corporation

Inventor： Mitsuo KASHIMA ,  Tomohiro KUTSUKI ,  Tomomi HIGASHIKAWA ,  Akiyoshi MURAMATSU

IPC: B60H1/32 ,  F25B49/02 ,  H02P21/00 ,  H02P27/08

Abstract: A synchronous motor control device includes: a DC power supply; an inverter main circuit; a three-phase synchronous motor; and an inverter control unit that outputs a PWM signal used to control the inverter main circuit. The inverter control unit includes: a PWM signal generation unit; a start-up control unit that outputs a start-up voltage command value to the PWM signal generation unit at the time of start-up; a steady state control unit that calculates a steady state voltage command value in a steady state and outputs the value to the PWM signal generation unit; and a steady state control parameter initial value calculation unit that outputs an initial value of a control parameter to the steady state control unit such that an output voltage vector from the inverter main circuit to the three-phase synchronous motor is consistent before and after switching from the start-up to the steady state.

公开(公告)号：US20160087547A1

公开(公告)日：2016-03-24

申请号：US14891741

申请日：2014-05-26

Applicant: MITSUBISHI ELECTRIC CORPORATION

Inventor： Michio YAMADA ,  Takuya SHIMOMUGI ,  Yosuke SHINOMOTO ,  Mitsuo KASHIMA ,  Shigeo UMEHARA

IPC: H02M7/06 ,  H02P27/00 ,  H02P23/00

CPC classification number: H02M7/06 ,  F24F11/85 ,  H02M1/12 ,  H02M1/4225 ,  H02M3/1584 ,  H02M5/458 ,  H02M7/08 ,  H02M7/53871 ,  H02M2001/0048 ,  H02M2003/1586 ,  H02P27/00 ,  Y02B70/126 ,  Y02B70/1491

Abstract: A power conversion device is configured to have reactors and is configured to have chopper circuit units, connected in series, that chop the output of a rectifier configured to rectify an AC voltage from an AC power supply. The power conversion device includes: an AC switch disposed on a side closer to the AC power supply than the chopper circuit units; an AC reactor that is connected in parallel to the AC switch; and a switching control unit that stops the switching of the switching elements when the contact of the AC switch is open.

Abstract translation: 电力转换装置被配置为具有电抗器并被配置为具有串联连接的斩波电路单元，其将被配置为对交流电源进行交流电压整流的整流器的输出切断。 电力转换装置包括：交流开关，其设置在比斩波电路单元更靠近交流电源的一侧; 与AC开关并联连接的交流电抗器; 以及切换控制单元，当AC开关的触点断开时，停止开关元件的切换。