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43 条记录 (耗时 0.016 秒)

    Controlling apparatus for induction motor
    11.
    发明公开
    Controlling apparatus for induction motor 失效
    SteuereinrichtungfürInduktionsmaschine

    公开(公告)号：EP0743745A2

    公开(公告)日：1996-11-20

    申请号：EP96303382.4

    申请日：1996-05-14

    申请人： HITACHI, LTD.

    发明人： Ishida, Seiji ,  Okuyama, Toshiaki ,  Tobari, Kazuaki ,  Oohashi, Hironori ,  Tomita, Hiroyuki ,  Fuji, Hiroshi

    IPC分类号： H02P21/00

    CPC分类号： H02P21/36

    摘要： By detecting that an induction motor has entered in regenerative running, the velocity or voltage is corrected such that the q-axis flux takes a negative value in regenerative running, thereby preventing the torque from being reduced by flux change and suppressing an insufficient torque.

    摘要翻译： 通过检测感应电动机已经进入再生运行，对速度或电压进行校正，使得q轴磁通在再生运转中变为负值，从而防止转矩由于磁通变化而减小并且抑制不足的转矩。

    Control method for induction motors
    14.
    发明公开
    Control method for induction motors 失效
    一种用于控制感应电动机的方法。

    公开(公告)号：EP0105511A2

    公开(公告)日：1984-04-18

    申请号：EP83109859.5

    申请日：1983-10-03

    申请人： HITACHI, LTD.

    发明人： Okuyama, Toshiaki

    IPC分类号： H02P5/40

    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 of controlling an induction motor
    15.
    发明公开
    Method of controlling an induction motor 有权
    一种用于控制三相感应电动机的方法

    公开(公告)号：EP1684410A3

    公开(公告)日：2009-01-14

    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： H02P21/00 ,  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

    Machine tool
    16.
    发明公开
    Machine tool 审中-公开
    Werkzeugmaschine

    公开(公告)号：EP1237257A2

    公开(公告)日：2002-09-04

    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： 一种具有能够在宽的速度范围内保持固定输出功率的电动机的机床。 电动机具有具有初级绕组（11）的定子（10）和具有场磁体（21）和轴的转子（20），所述磁场磁体包括具有不同极性磁极的第一场磁体（21A） 顺序地沿旋转方向布置，并且具有沿旋转方向依次布置的具有不同极性磁极的第二场磁体（21B），以及用于相对于另一个磁场磁铁沿一个磁场向轴向旋转方向移动一个磁场磁体的机构， 所述第一和第二场磁体的磁场改变。

    PWM control apparatus and a system using same
    19.
    发明公开
    PWM control apparatus and a system using same 失效
    Pulsbreitenmodulationsvorrichtung und dieselbe benutzendes系统

    公开(公告)号：EP0732798A1

    公开(公告)日：1996-09-18

    申请号：EP96301631.6

    申请日：1996-03-11

    申请人： HITACHI, LTD.

    发明人： Iwaji, Yoshitaka, Oonuma-ryo E0720 ,  Okuyama, Toshiaki ,  Ikimi, Takashi, Oonuma-ryo E0518 ,  Tobise, Masahiro

    IPC分类号： H02M7/5395

    CPC分类号： H02M7/5395 ,  B21B37/46

    摘要： In PWM control apparatus having a command value generator, a pulse width modulator which, in response to a command value from said command value generator, computes a pulse wave to be output having a width corresponding to said command value for period specified Δt, and a power conversion unit including semiconductor elements which are driven by said pulse wave, the improvement is characterized by further comprising: means for compensating a command value by sampling said command value at least twice in said period specified Δt to compute an average value of said command value on the basis of said sampling, whereby said pulse width modulator computes said pulse wave to be output in response to said average value of said command value from said means for compensating said command value. Further, the same PWM control apparatus comprises:
    a triangle wave carrier generator which generates a triangle wave carrier signal having a cycle which is n times (n is integer) said period specified Δt, wherein, said means for compensating said command value is adapted to compute an average value of said command value at every sampling thereof within a period defined by a half cycle of said triangle wave carrier signal, i.e., from a plus peak to a minus peak or vice versa, and wherein, said pulse width modulator is adapted to compare said average value with said triangle wave carrier thereby to compute said pulse wave to be output.

    摘要翻译： 在具有指令值发生器的PWM控制装置中，脉冲宽度调制器响应于来自所述指令值发生器的指令值计算出输出的脉冲波具有对应于周期指定DELTA t的所述命令值的宽度，以及 功率转换单元，包括由所述脉冲波驱动的半导体元件，其改进的特征在于还包括：用于通过在所述指定DELTA t的所述周期中至少两次采样所述命令值来补偿指令值的装置，以计算所述指令值的平均值 基于所述采样的所述指令值，由此所述脉冲宽度调制器根据所述指令值的所述平均值从所述用于补偿所述指令值的装置计算要输出的所述脉冲波。 此外，同一PWM控制装置包括：三角波载波发生器，其生成具有指定DELTA t的周期为n倍（n为整数）的周期的三角波载波信号，其中，所述用于补偿所述命令值的装置被适配 在由所述三角波载波信号的半周期（即，从正峰值到负峰值）或反之亦然所限定的周期内计算其每次采样时的所述命令值的平均值，并且其中，所述脉冲宽度调制器 适于将所述平均值与所述三角波载波进行比较，从而计算要输出的所述脉冲波。