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    • 1. 发明授权
    • Vector control system for induction motors
    • 感应电动机矢量控制系统
    • US4808903A
    • 1989-02-28
    • US181313
    • 1988-04-13
    • Takayuki MatsuiToshiaki OkuyamaTakashi SukegawaJunichi Takahashi
    • Takayuki MatsuiToshiaki OkuyamaTakashi SukegawaJunichi Takahashi
    • H02P21/00H02P21/14H02P5/40
    • H02P21/22H02P2207/01
    • A vector control system for an induction motor driven by a power converter which generates three phase ac currents containing harmonics. In the system, an exciting current command value and a torque current command value in a rotating magnetic field coordinate system are applied, induction motor primary currents in a stator coordinate system is detected at a period which is the same or integral multiple of that of the harmonic components by integration operation, the detected value of the integrated primary currents is subjected to definite integration over the same time interval as the period thereof thereby detecting fundamental wave components of the primary currents without the harmonic components, the fundamental wave components are transformed in the form of rotating magnetic field coordinate system thereby detecting an exciting current component and a torque current component, a deviation between the exciting current command value and the detected actual exciting current component and a deviation between the torque current command value and the detected actual torque current component are detected respectively, and producing and applying to the power converter three phase ac voltage command values in the stator coordinate system tending to reduce the deviations to zero.
    • 用于由产生包含谐波的三相交流电的功率转换器驱动的感应电动机的矢量控制系统。 在该系统中,施加旋转磁场坐标系中的励磁电流指令值和转矩电流指令值,定子坐标系中的感应电动机初级电流以与该定子坐标系相同或整数倍的周期检测 谐波分量通过积分运算,积分一次电流的检测值在与其周期相同的时间间隔内受到一定的积分,从而检测一次电流的基波分量,而没有谐波分量,基波成分在 旋转磁场坐标系的形式,从而检测励磁电流分量和转矩电流分量,励磁电流指令值与检测到的实际励磁电流分量之间的偏差以及转矩电流指令值与检测到的实际转矩电流分量之间的偏差 分别被检测到 在定子坐标系中产生并施加到功率转换器的三相交流电压指令值,倾向于将偏差减小到零。
    • 6. 发明授权
    • Receiver and receiving method of the receiver
    • 接收机的接收和接收方法
    • US08301208B2
    • 2012-10-30
    • US12472741
    • 2009-05-27
    • Yusaku KatsubeMasaaki YamadaJunichi Takahashi
    • Yusaku KatsubeMasaaki YamadaJunichi Takahashi
    • H04M1/00H04B1/38
    • H04L27/3854H04L7/041H04L27/0014
    • The receiver includes a low noise amplifier, a local signal generator, a first mixer, a second mixer, a first amplifier, a second amplifier, a first A/D converter, a second A/D converter, and a signal level detection unit. A detection signal from at least one terminal of the first A/D converter is supplied to an input terminal of the signal level detection unit, thereby generating a reception start signal from the output terminal. Before an RF reception signal is received, a first signal processing unit containing the first mixer, the first amplifier, and the first A/D converter is controlled to an active state, and a second signal processing unit containing the second mixer, the second amplifier, and the second A/D converter is controlled to a low power consumption state. After the RF reception signal is received, the second signal processing unit is controlled to the active state.
    • 接收机包括低噪声放大器,本地信号发生器,第一混频器,第二混频器,第一放大器,第二放大器,第一A / D转换器,第二A / D转换器和信号电平检测单元。 来自第一A / D转换器的至少一个端子的检测信号被提供给信号电平检测单元的输入端,从而从输出端产生接收开始信号。 在接收到RF接收信号之前,将包含第一混频器,第一放大器和第一A / D转换器的第一信号处理单元控制为有效状态,以及包含第二混频器的第二信号处理单元,第二放大器 并且第二A / D转换器被控制到低功耗状态。 在RF接收信号被接收之后,第二信号处理单元被控制到活动状态。
    • 10. 发明申请
    • POLYMER CLAD OPTICAL FIBER
    • 聚合物光纤
    • US20090196560A1
    • 2009-08-06
    • US12439376
    • 2008-03-14
    • Kenji OkadaJunichi Takahashi
    • Kenji OkadaJunichi Takahashi
    • G02B6/036
    • G02B6/02033G02B6/03605G02B6/03627G02B6/03633
    • A polymer clad optical fiber is provided in which, if the diameter of an inner core is taken as a1, and the diameter of an outer core is taken as a2, and if a ratio X (which=a22/a12) between a cross-sectional area of the inner core and a cross-sectional area of the outer core is within a range of 1.8≦X≦2.2, and if a relative refractive index difference between the inner core and the outer core is taken as Δ1, and if a relative refractive index difference between the outer core and a cladding is taken as Δ2, then for a parameter Y which is defined as Y=Δ1/Δ2, when a high temperature is taken as Ymax and a low temperature is taken as Ymin, a relationship is established in which, when X is within a range of 1.8≦X≦2.0, then 0.25≦Ymin≦0.84X−0.68, and Ymax is 0.25≦Ymax≦0.84X−0.68, and, when X is within a range of 2.0≦X≦2.2, Ymin is 0.48X−0.71≦Ymin≦−2/9X+13/9, and Ymax is 0.48X−0.71≦Ymax≦−2/9X+13/9.
    • 提供一种聚合物包覆光纤,其中如果将内芯的直径取为a1,将外芯的直径作为a2,并且如果将内芯的直径作为a的比例X(= a22 / a12) 内芯的截面面积和外芯的横截面面积在1.8 <= X <= 2.2的范围内,并且如果将内芯和外芯之间的相对折射率差作为Delta1,并且 如果将外芯和包层之间的相对折射率差作为Δ2,则对于定义为Y = Delta1 / Delta2的参数Y,当将高温作为Ymax,将低温作为Ymin时, 建立了当X在1.8 <= X <= 2.0的范围内时,0.25 <= Ymin <= 0.84X-0.68,Ymax为0.25 <= Ymax <= 0.84×-0.68的关系, 当X在2.0 <= X <= 2.2的范围内时,Ymin为0.48X-0.71 <= Ymin <= - 2 / 9X + 13/9,Ymax为0.48X-0.71 <= Ymax <= -2 / 9X + 13/9。