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    CURRENT DISTORTION REDUCTION APPARATUS
    1.
    发明公开
    CURRENT DISTORTION REDUCTION APPARATUS 审中-公开

    公开(公告)号：US20230275571A1

    公开(公告)日：2023-08-31

    申请号：US18006616

    申请日：2021-07-20

    Applicant: DAIKIN INDUSTRIES, LTD.

    Inventor： Ryou MATSUYAMA ,  Reiji KAWASHIMA ,  Masaki KOUNO

    IPC: H03H11/04

    CPC classification number: H03H11/04

    Abstract: A technology that can reduce the influence of variations in the reference potential of each current output device on the operation of multiple current output devices, when using the multiple current output devices to reduce the distortion of the load current, is provided. An embodiment of the present disclosure includes a plurality of active filters 41 to 43 configured to reduce distortion of a load current supplied from the AC power supply 10 to the load device 20, based on a detection signal output from the load current sensor 30, the detection signal relating to the distortion of the load current; and the signal transmitting unit 44 configured to cause the plurality of active filters 41 to 43 to acquire a signal relating to the distortion of the load current, to reduce influence due to variation of a standard potential of the plurality of active filters 41 to 43, based on the detection signal output from the load current sensor 30.

    SPEED COMMAND CORRECTION DEVICE AND PRIMARY MAGNETIC FLUX COMMAND GENERATION DEVICE
    2.
    发明申请
    SPEED COMMAND CORRECTION DEVICE AND PRIMARY MAGNETIC FLUX COMMAND GENERATION DEVICE 审中-公开

    公开(公告)号：US20180309398A1

    公开(公告)日：2018-10-25

    申请号：US15767876

    申请日：2016-10-27

    Applicant: DAIKIN INDUSTRIES, LTD.

    Inventor： Minoru KITOU ,  Nobuki KITANO ,  Naoto KOBAYASHI ,  Hiroshi HIBINO ,  Ryou MATSUYAMA

    IPC: H02P21/05 ,  H02P21/20

    CPC classification number: H02P21/05 ,  H02P21/20

    Abstract: A subtractor subtracts an angular speed correction amount from a rotational speed command to obtain a corrected rotational speed command. An adder adds a second-axis current correction value to a γc-axis current to obtain a corrected second-axis current. An angular ripple extraction unit obtains, from a rotational angle on a mechanical angle of a synchronous motor, a rotational angle difference being a ripple component of the rotational angle. An nth-order component extraction unit extracts nth-order components of a fundamental frequency of the rotational angle from the rotational angle difference. A torque conversion unit obtains nth-order components of an estimated value of vibration torque. A correction amount calculation unit obtains the second-axis current correction value using the nth-order components.

    POWER CONVERSION DEVICE
    4.
    发明申请
    POWER CONVERSION DEVICE 有权

    公开(公告)号：US20210344281A1

    公开(公告)日：2021-11-04

    申请号：US17378979

    申请日：2021-07-19

    Applicant: DAIKIN INDUSTRIES, LTD.

    Inventor： Ryou MATSUYAMA ,  Masaki KONO ,  Tomoisa TANIGUCHI

    IPC: H02M7/5387 ,  H02M1/32 ,  H02M7/217 ,  H02M1/00 ,  H02M7/04 ,  H03K17/081

    Abstract: A converter circuit converts AC electric power into DC power. An inverter circuit converts the DC power into AC power. A capacitor is connected in parallel to each of the converter circuit and the inverter circuit between these circuits. The capacitor allows variation of an output voltage from the converter circuit, and absorbs variation of an output voltage from the inverter circuit due to a switching operation. An overvoltage protection circuit includes a resistor and a semiconductor element connected in series to each other. The overvoltage protection circuit is connected in parallel to the capacitor to protect the inverter circuit from an overvoltage. First and second control units respectively control the inverter circuit and the overvoltage protection circuit.

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