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43 条记录 (耗时 0.015 秒)

    Method of controlling an induction motor
    1.
    发明公开
    Method of controlling an induction motor 有权
    Methode zur Regelung eines Drehstrom-Asynchronmotors

    公开(公告)号：EP2246972A2

    公开(公告)日：2010-11-03

    申请号：EP10006721.4

    申请日：2000-04-12

    申请人： Hitachi, Ltd.

    发明人： Tobari, Kazuaki ,  Okuyama, Toshiaki

    IPC分类号： H02P21/00 ,  H02P21/04 ,  H02P21/14

    CPC分类号： H02P21/04 ,  H02P21/18 ,  H02P21/24 ,  H02P21/26 ,  H02P2207/01

    摘要： The present invention relates to a method of controlling an induction motor (1) with a rotational speed-control apparatus (2-16), which includes a power-conversion unit (2), for such controlling a frequency and current output from said power-conversion unit in accordance with a rotational speed instruction value (ωr*) that if said rotational speed instruction value is less than a predetermined value, current output from said power-conversion unit is controlled at a predetermined value larger than that in an ordinary no-load operation, and the value of said current is corrected corresponding to a value which is obtained by adding an estimated slip frequency value (ωs^) calculated based on the value of said voltage output from said power-conversion unit to a calculated slip frequency value (ωs*) calculated by using a value of current output from said power-conversion unit.

    摘要翻译： 本发明涉及一种利用转速控制装置（2-16）控制感应电动机（1）的方法，转速控制装置（2-16）包括功率转换单元（2），用于控制从所述功率输出的频率和电流 - 转换单元，其根据转速指令值（Ér*），如果所述转速指令值小于预定值，则从所述功率转换单元输出的电流被控制在比通常的no大的预定值 并且所述电流值对应于通过将基于从所述功率转换单元输出的所述电压的值计算出的估计转差频率值（És^）与计算出的转差频率 通过使用从所述功率转换单元输出的电流值计算的值（És*）。

    Control method for induction motors
    6.
    发明公开
    Control method for induction motors 失效
    电感电机控制方法

    公开(公告)号：EP0105511A3

    公开(公告)日：1985-11-13

    申请号：EP83109859

    申请日：1983-10-03

    申请人： HITACHI, LTD.

    发明人： Okuyama, Toshiaki

    IPC分类号： H02P05/40

    CPC分类号： H02P21/18 ,  H02P21/26 ,  H02P2207/01

    摘要： A quick response vector controll method which is one of methods for controlling a speed of an induction motors (2) without a speed detector; in which a voltage of the motor is detected (6) to resolve (7, 8) into a vector component e d parallel with an exciting current component vector of a primary current and a vector component eq orthogonal to said exciting current component vector, and a frequency of the primary current is controlled (5, 9, 10, 12, 13, 15) to maintain the vector component e d at zero, while at the same time the primary current is controlled corresponding to a difference (5) between the vector component eq and the speed command signal (3).

    Method and apparatus for controlling PWM inverter
    7.
    发明公开
    Method and apparatus for controlling PWM inverter 失效
    对于脉冲宽度调制逆变器的控制方法和装置。

    公开(公告)号：EP0102614A2

    公开(公告)日：1984-03-14

    申请号：EP83108555.0

    申请日：1983-08-30

    申请人： HITACHI, LTD.

    发明人： Okuyama, Toshiaki ,  Nagase, Hiroshi

    IPC分类号： H02P5/40 ,  H02M7/515

    CPC分类号： H02M7/527 ,  H02M7/48

    摘要： An induction motor (4) is driven by a PWM inverter (3) including switching elements such as gate turn-off thyristors of Graetz connection. Turn-on of the PWM inverter is controlled by PWM pulse signals generated from a pulse width modulator. The pulse width modulator includes comparators (10) having a hysteresis characteristic which generate the PWM pulse signals on the basis of the magnitude and polarity of current errors between current command pattern signals and signals indicative of detected output currents of the PWM inverter. A signal generator (12, 20) generates an AC signal which is applied to the comparators (10) so that the PWM pulse signals generated from the comparators act to increase the effective value of the neutral voltages of the output of the PWM inverter.

    Method of controlling an induction motor
    8.
    发明公开
    Method of controlling an induction motor 有权
    Methode zur Regelung eines Drehstrom-Asynchronmotors

    公开(公告)号：EP1684410A2

    公开(公告)日：2006-07-26

    申请号：EP06009546.0

    申请日：2000-04-12

    申请人： Hitachi, Ltd.

    发明人： Tobari, Kazuaki ,  Okuyama, Toshiaki

    IPC分类号： H02P21/04 ,  H02P21/14

    CPC分类号： H02P21/04 ,  H02P21/18 ,  H02P21/24 ,  H02P21/26 ,  H02P2207/01

    摘要： In a method of controlling an induction motor with a rotational speed-control apparatus, which includes a power-conversion unit, for controlling a frequency and voltage output from said power-conversion unit in accordance with a rotational speed instruction value, said rotational speed-control apparatus adds said rotational speed instruction value to a sum of an estimated slip frequency value obtained based on the value of said voltage output from said power-conversion unit and a calculated slip frequency value obtained by using a value of current output from said power-conversion unit corresponding to the result of said addition

    摘要翻译： 在利用包括电力转换单元的旋转速度控制装置控制感应电动机的方法中，根据转速指令值来控制从所述电力转换单元输出的频率和电压， 控制装置将所述转速指令值加到基于从所述功率转换单元输出的所述电压值获得的估计转差频率值和通过使用从所述功率转换单元输出的电流值获得的计算出的转差频率值之和， 转换单元对应于所述相加结果

    Machine tool
    9.
    发明公开
    Machine tool 审中-公开
    机床

    公开(公告)号：EP1237257A3

    公开(公告)日：2004-07-07

    申请号：EP02003284.3

    申请日：2002-02-22

    申请人： Hitachi, Ltd.

    发明人： Kim, Houng Joong ,  Okuyama, Toshiaki

    IPC分类号： H02K7/12 ,  H02K16/02

    CPC分类号： H02K16/02 ,  H02K7/12

    摘要： A machine tool provided with an electric motor which can maintain the fixed output power in a wide speed range. The electric motor has a stator (10) having a primary winding (11), and a rotor (20) having a field magnet (21) and a shaft, said field magnet comprising a first field magnet (21A) having different polarity magnetic poles sequentially arranged in a rotating direction and a second field magnet (21B) having different polarity magnetic poles sequentially arranged in a rotating direction, and a mechanism for shifting one field magnet in axial and rotating directions with respect to the other field magnet, whereby a composite magnetic field of said first and said second field magnets is changed.

    摘要翻译： 配备电动机的机床可以在较宽的转速范围内保持固定的输出功率。 该电动机具有包括初级绕组（11）的定子（10）和具有场磁体（21）和轴的转子（20），所述场磁体包括具有不同极性磁极的第一场磁体（21A） 依次排列在旋转方向上的第二场磁铁（21B）和沿旋转方向依次排列的极性不同的第二场磁铁（21B）;以及使一个场磁铁相对于另一个场磁铁沿轴向和旋转方向移动的机构， 所述第一和所述第二场磁体的磁场改变。

    PWM converter system
    10.
    发明公开
    PWM converter system 审中-公开
    PWM转换器系统

    公开(公告)号：EP1251631A3

    公开(公告)日：2003-12-10

    申请号：EP02007511.5

    申请日：2002-04-02

    申请人： Hitachi, Ltd.

    发明人： Sakai, Keijirou ,  Okuyama, Toshiaki ,  Nakatsu, Kinya ,  Ishida, Seiji ,  Fujii, Hiroshi ,  Kato, Junji ,  Hiraga, Masahiro

    IPC分类号： H02M7/519 ,  H02M1/12

    CPC分类号： H02M1/4233 ,  H02M1/4216 ,  H02M2001/0012 ,  Y02B70/126

    摘要： A single-phase PWM converter system in accordance with the present invention employs a sample-and-hold circuit which samples and holds a direct current in the state wherein one of two-phase gate signals of a positive or negative side arm is ON and the other phase is OFF, determines the sign of an output of the sample-and-hold circuit according to the two-phase gate condition, detects a phase current at the input side of the converter, and controls a voltage at the input side of the converter so that the detected current value agrees with a power supply current command. Further, a three-phase PWM converter system in accordance with the present invention detects the effective current and the ineffective current of the power supply current from the direct current, and based on the values, controls the PWM converter so that the sine wave power supply current whose power supply power factor is 1 is provided.