Reactive power compensating cycloconverter
    1.
    发明授权
    Reactive power compensating cycloconverter 失效
    无功补偿循环换流器

    公开(公告)号:US4529925A

    公开(公告)日:1985-07-16

    申请号:US562213

    申请日:1983-12-16

    IPC分类号: G05F1/70 H02J3/18 H02M5/27

    CPC分类号: H02M5/271 H02J3/18 Y02E40/30

    摘要: A power control apparatus which includes a cycloconverter having thyristors in which a circulating current flows, for supplying a compensating current to AC power lines; capacitors for supplying a reactive current component of the compensating current to the thyristors; a trigger control circuit for controlling the triggering of the thyristors; a detector coupled to the cycloconverter, for detecting from switching currents flowing through the thyristors a circulating signal corresponding to the circulating current. The compensating current serves to improve the power factor of the AC lines as well as to reduce higher harmonic currents on the AC lines. The circulating signal is fed back to the trigger control circuit so that the amount of the circulating current is kept substantially constant according to a negative feedback operation.

    摘要翻译: 一种功率控制装置,包括具有循环电流流动的晶闸管的循环换流器,用于向AC电力线提供补偿电流; 用于将补偿电流的无功电流分量提供给晶闸管的电容器; 用于控制晶闸管的触发的触发控制电路; 耦合到所述循环换流器的检测器,用于从流过所述晶闸管的开关电流检测对应于所述循环电流的循环信号。 补偿电流用于提高交流线路的功率因数,并降低交流线路上的高次谐波电流。 循环信号被反馈到触发控制电路,使得循环电流的量根据负反馈操作保持基本上恒定。

    Method and apparatus for controlling the circulating current of a
cycloconverter
    2.
    发明授权
    Method and apparatus for controlling the circulating current of a cycloconverter 失效
    用于控制循环变频器的循环电流的方法和装置

    公开(公告)号:US4418380A

    公开(公告)日:1983-11-29

    申请号:US305226

    申请日:1981-09-24

    IPC分类号: H02M5/27 H02P13/30

    CPC分类号: H02M5/271

    摘要: A circulating current of a cycloconverter in each phase is distributed and controlled in such a way that a circulating current in a phase having a large absolute value of a load current is small, and the circulating current of a phase having a small absolute value of the load current is large. Therefore, the reactive power is so compensated that the sum of lagged reactive powers of the phases and advanced reactive power of a phase advancing capacitor cancel out each other.

    摘要翻译: 每相中的循环变换器的循环电流被分布和控制,使得负载电流绝对值大的相位中的循环电流小,并且具有小的绝对值的相位的循环电流 负载电流大。 因此,无功功率得到如此补偿,使得相位提前电容器的相位和高级无功功率的滞后无功功率之和相互抵消。

    Driving control apparatus for induction motor
    3.
    发明授权
    Driving control apparatus for induction motor 失效
    感应电机驱动控制装置

    公开(公告)号:US5365158A

    公开(公告)日:1994-11-15

    申请号:US982613

    申请日:1992-11-27

    IPC分类号: H02P21/08 G06G7/60 H02P7/36

    CPC分类号: H02P21/09

    摘要: A slip frequency type driving control apparatus includes a detector for detecting an input current and an input voltage to an induction motor, a calculating unit for calculating a rotor flux and a torque current of the induction motor, a neural network for outputting an excitation current command value and a slip frequency command value, and a vector control unit for performing vector control for the induction motor. The neural network receives a rotor flux command value, a torque current command value, a calculated rotor flux value, and a calculated torque current value, performs learning on the basis of a back-propagation law using signals output in correspondence with these inputs, and outputs an excitation current command value and a slip frequency command value. The vector control unit detects the torque current and the excitation current on the basis of the output slip frequency command value from the neural network and controls the induction motor in accordance with a deviation between the detected excitation current value and the excitation current command value and a deviation between the detected torque current value and the torque current command value.

    摘要翻译: 滑差频率型驱动控制装置包括:检测器,用于检测输入电流和对感应电动机的输入电压;计算单元,用于计算感应电动机的转子磁通和转矩电流;神经网络,用于输出励磁电流指令 值和转差指令值,以及用于对感应电动机进行矢量控制的矢量控制单元。 神经网络接收转子磁通指令值,转矩电流指令值,计算出的转子磁通值和计算出的转矩电流值,使用与这些输入对应地输出的信号,基于反向传播规律进行学习,以及 输出励磁电流指令值和转差频率指令值。 矢量控制单元根据来自神经网络的输出滑差频率指令值检测转矩电流和励磁电流,并根据检测到的励磁电流值和励磁电流指令值之间的偏差来控制感应电机, 检测到的转矩电流值与转矩电流指令值之间的偏差。

    Control apparatus for induction machine
    4.
    发明授权
    Control apparatus for induction machine 失效
    感应电机控制装置

    公开(公告)号:US5003243A

    公开(公告)日:1991-03-26

    申请号:US250171

    申请日:1988-09-28

    IPC分类号: H02P21/08 H02P21/14

    CPC分类号: H02P21/09 H02P2207/01

    摘要: A slip frequency type vector control apparatus for an induction machine which is provided with first and second feedback circuits for correcting respective magnetization current command and torque current command supplied feed-forwardly so as to eliminate the influence of a change in temperature of the induction machine secondary resistance and realize a correct vector control.

    Control apparatus of DC motors
    5.
    发明授权
    Control apparatus of DC motors 失效
    直流电机控制装置

    公开(公告)号:US3942085A

    公开(公告)日:1976-03-02

    申请号:US507352

    申请日:1974-09-19

    IPC分类号: H02P7/29 H02P7/36

    CPC分类号: H02P7/29 Y10S388/921

    摘要: In apparatus for controlling the speed of a DC motor by the ON-OFF control of a switching transistor, a pair of switching transistors are connected in series with the motor and the switching transistors controlled such that while one of them is rendered ON the other is rendered from ON to OFF and sequentially from OFF to ON.

    摘要翻译: 在通过开关晶体管的接通控制来控制直流电动机的速度的装置中,一对开关晶体管与电动机串联连接,并且开关晶体管被控制为使得其中一个被接通而另一个是 从ON到OFF,并从OFF到ON。

    Power conversion system
    6.
    发明授权
    Power conversion system 失效
    电源转换系统

    公开(公告)号:US5504667A

    公开(公告)日:1996-04-02

    申请号:US301855

    申请日:1994-09-07

    摘要: A power conversion system including a single-phase AC power source for generating an AC power. The power conversion system further includes an AC/DC power converter connected to the single-phase AC power source for converting the AC power into a DC power, a main smoothing capacitor connected to DC terminals of the AC/DC power converter, a DC active filter connected in parallel with the main smoothing capacitor for controlling a compensation current flowing in the DC active filter such as to absorb an amount of fluctuation of the AC power supplied from the single-phase AC power source, and a load device connected to the main smoothing capacitor as a DC voltage source for receiving a first DC voltage applied to the main smoothing capacitor.

    摘要翻译: 一种电力转换系统,包括用于产生AC电力的单相交流电源。 电力转换系统还包括连接到用于将AC电力转换为DC电力的单相AC电源的AC / DC电力转换器,连接到AC / DC电力转换器的DC端子的主平滑电容器,DC有源 与主平滑电容器并联连接的滤波器,用于控制在直流有源滤波器中流动的补偿电流,以吸收从单相AC电源提供的交流电力的波动量,以及连接到主电源的负载装置 平滑电容器作为用于接收施加到主平滑电容器的第一DC电压的DC电压源。

    AC motor drive apparatus
    7.
    发明授权
    AC motor drive apparatus 失效
    交流电机驱动装置

    公开(公告)号:US4760321A

    公开(公告)日:1988-07-26

    申请号:US71395

    申请日:1987-07-09

    IPC分类号: H02P27/04 H02P5/28

    CPC分类号: H02P27/16

    摘要: An AC motor drive apparatus of this invention is constituted by an AC power source, a first circulating current type cycloconverter having an output terminal coupled to the AC power source, a phase-advanced capacitor coupled to an input terminal of the first cycloconverter, a second circulating current type cycloconverter having an input terminal coupled to the phase-advanced capacitor, and an AC motor coupled to an output terminal of the second cycloconverter. The first cycloconverter controls a current supplied from the AC power source to be a sine wave in the same phase as that of the power source voltage, so that a voltage crest value of the phase-advanced capacitor becomes substantially constant. The second cycloconverter supplies a sine wave current of a variable frequency to the AC motor.

    摘要翻译: 本发明的交流电机驱动装置由交流电源,具有耦合到交流电源的输出端的第一循环电流型循环换流器,耦合到第一循环换流器的输入端的相位超前电容器构成,第二 具有耦合到相位超前电容器的输入端的循环电流型循环换流器和耦合到第二循环换流器的输出端的AC电动机。 第一循环变频器将从AC电源提供的电流控制为与电源电压相同的正弦波,使得相位超前电容器的电压峰值变得基本恒定。 第二个循环变频器向交流电机提供可变频率的正弦波电流。

    Spinal stabilization devices, systems, and methods

    公开(公告)号:US10517650B2

    公开(公告)日:2019-12-31

    申请号:US12434515

    申请日:2009-05-01

    IPC分类号: A61B17/70

    摘要: This specification describes spinal stabilization devices that may be introduced into the spine via surgical procedures. In particular, this specification describes an inter-spinous process spacer having a core chosen, in one variation, to provide a kyphotic or lordotic angle to the device. The specification also describes systems including the described devices and methods of introducing the devices and systems into the spine to provide effective stabilization.

    LATERAL MASS FIXATION SYSTEM
    9.
    发明申请
    LATERAL MASS FIXATION SYSTEM 审中-公开
    侧向质量固定系统

    公开(公告)号:US20150342649A1

    公开(公告)日:2015-12-03

    申请号:US14723410

    申请日:2015-05-27

    IPC分类号: A61B17/70 A61B17/17 A61B17/16

    摘要: A device for accessing and guiding at least one fixation device to a spine may include a distal portion configured to fit in a facet of the spine and a proximal portion extending from the distal portion. The proximal portion may be detachable from the distal portion and may be hollow or solid. A system for accessing and guiding at least one fixation device to a spine may include a distal portion configured to fit in a facet of the spine, a proximal portion extending from the distal portion, and a slidable guide device for sliding over the facet guide device to guide at least one instrument to the spine.

    摘要翻译: 用于访问和引导至少一个固定装置到脊椎的装置可以包括构造成装配在脊的小平面中的远侧部分和从远端部分延伸的近端部分。 近端部分可以从远侧部分可拆卸并且可以是中空的或实心的。 用于访问和引导至少一个固定装置到脊椎的系统可以包括构造成装配在脊柱的小平面中的远端部分,从远侧部分延伸的近端部分和用于在小平面导向装置上滑动的可滑动的引导装置 将至少一个仪器引导到脊柱。