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10 条记录 (耗时 0.01 秒)

    A control apparatus for rectifying circuits
    2.
    发明公开
    A control apparatus for rectifying circuits 失效
    控制装置，用于整流电路。

    公开(公告)号：EP0199903A2

    公开(公告)日：1986-11-05

    申请号：EP86101424.9

    申请日：1986-02-04

    申请人： HITACHI, LTD.

    发明人： Muto, Nobuyoshi ,  Sakai, Keijiro ,  Suzuki, Toshio ,  Ueda, Akiteru ,  Nando, Kenji ,  Okajima, Ikuo

    IPC分类号： H02M3/10

    CPC分类号： H02M3/157

    摘要： A single phase, full wave diode bridge circuit (20) is connected with a chopper (30) on its DC output side. The output voltage of the chopper (30) is smoothed by a smoothing capacitor (40) and thereafter supplied to a load (50). A current control apparatus (80-100) forms a current reference signal which is synchronized with an AC voltage applied to the bridge circuit (20) and has a magnitude corresponding to the current flowing through the load (50) and produces a deviation signal between the current reference signal and an actual AC input current of the bridge circuit (20). The chopper (30) is controlled in accordance with the deviation signal so that the AC input current follows the current reference signal, whereby the power factor and the waveform of the AC input current is improved.

    Method and apparatus for controlling induction motor
    4.
    发明公开
    Method and apparatus for controlling induction motor 失效
    用于控制感应电动机的方法和设备。

    公开(公告)号：EP0082303A1

    公开(公告)日：1983-06-29

    申请号：EP82110523.6

    申请日：1982-11-15

    申请人： Hitachi, Ltd.

    发明人： Muto, Nobuyoshi ,  Nagase, Hiroshi ,  Sakai, Keijiro ,  Matsuda, Yasuo

    IPC分类号： H02P5/40 ,  H02P7/00

    CPC分类号： H02P21/09 ,  H02P2207/01

    摘要： Disclosed is a method and apparatus for operating an induction motor by an inverter of the pulse-width modulation (PWM) type, wherein the slip frequency is calculated from the speed command and the actual motor speed so as to produce the phase compensation signal, and the frequency command for the inverter (22) is produced by adding the phase compensation signal, the slip frequency signal and the motor speed signal. The primary current command is calculated from the slip frequency, the amplitude ratio of pulse-width modulation is calculated basing on the primary current command and the actual primary current, and the inverter (22) is controlled in accordance with the amplitude ratio so as to control the primary current of the induction motor (23).

    A control apparatus for rectifying circuits
    10.
    发明公开
    A control apparatus for rectifying circuits 失效
    一种用于修复电路的控制装置

    公开(公告)号：EP0199903A3

    公开(公告)日：1987-10-07

    申请号：EP86101424

    申请日：1986-02-04

    申请人： HITACHI, LTD.

    发明人： Muto, Nobuyoshi ,  Sakai, Keijiro ,  Suzuki, Toshio ,  Ueda, Akiteru ,  Nando, Kenji ,  Okajima, Ikuo

    IPC分类号： H02M03/10

    CPC分类号： H02M3/157

    摘要： A single phase, full wave diode bridge circuit (20) is connected with a chopper (30) on its DC output side. The output voltage of the chopper (30) is smoothed by a smoothing capacitor (40) and thereafter supplied to a load (50). A current control apparatus (80-100) forms a current reference signal which is synchronized with an AC voltage applied to the bridge circuit (20) and has a magnitude corresponding to the current flowing through the load (50) and produces a deviation signal between the current reference signal and an actual AC input current of the bridge circuit (20). The chopper (30) is controlled in accordance with the deviation signal so that the AC input current follows the current reference signal, whereby the power factor and the waveform of the AC input current is improved.