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公开(公告)号：US4322671A
公开(公告)日：1982-03-30
申请号：US107088
申请日：1979-12-26
申请人： Shigeki Kawada , Hiroshi Ishida , Yutaka Koiwai
发明人： Shigeki Kawada , Hiroshi Ishida , Yutaka Koiwai
CPC分类号： H02P27/026
摘要： An induction motor drive apparatus brings the actual speed of an induction motor into coincidence with a command speed by varying the frequency and effective value of a three-phase AC voltage applied to the induction motor and limits the torque of the induction motor in the low speed region by controlling an amplitude of a speed deviation signal below a prescribed value. The apparatus includes an inverter for generating three-phase AC voltage, a speed deviation signal generator, a torque limit signal generator, an amplitude controller for controlling the amplitude of the speed deviation signal based on the presence of the torque limit signal, a slip signal generator which generates a slip signal having a positive or negative constant voltage conforming to the rotational direction of the induction motor, an adder for adding together a voltage signal which conforms to the actual speed and the slip signal, a rectangular waveform signal generator, a multiplier for multiplying an output of the amplitude controller by an output of the adder and a pulse width modulator. The rectangular waveform signal generator is adapted to produce a three-phase rectangular signal whose frequency is proportional to the output voltage value of the adder. The rectangular signal of each phase is modulated in pulse width on the basis of the speed deviation, the inverter being controlled by each resulting pulse-width modulated rectangular signal to thereby vary the effective value of the three-phase AC voltage and to make the speed of the induction motor constant.
摘要翻译： 感应电机驱动装置通过改变施加到感应电动机的三相AC电压的频率和有效值，使感应电动机的实际速度与指令速度一致，并将感应电动机的转矩限制在低速 通过将速度偏差信号的幅度控制在规定值以下。 该装置包括用于产生三相AC电压的逆变器，速度偏差信号发生器，转矩限制信号发生器，用于根据扭矩限制信号的存在来控制速度偏差信号的振幅的幅度控制器，滑移信号 发生器，其产生具有与感应电动机的旋转方向一致的正或负恒定电压的滑差信号，用于将符合实际速度的电压信号和滑差信号相加的加法器，矩形波形信号发生器，乘法器 用于将幅度控制器的输出乘以加法器的输出和脉冲宽度调制器。 矩形波形信号发生器适于产生频率与加法器的输出电压值成比例的三相矩形信号。 基于速度偏差，每相的矩形信号以脉冲宽度调制，逆变器由所得到的脉冲宽度调制矩形信号控制，从而改变三相交流电压的有效值，并使速度 的感应电动机常数。
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公开(公告)号：US4123645A
公开(公告)日：1978-10-31
申请号：US768562
申请日：1977-02-14
CPC分类号： B23H7/06
摘要： A numerically controlled wire-cutting electric discharge machine composed of a numerical control apparatus controlling a feeding of a piece of work on at least three axes and a wire-cutting electric discharge apparatus. The wire-cutting discharge apparatus comprises a pair of V type slot guides which stretch a wire therebetween, a first and a second drive means which displace the work in the direction of two axes with respect to the wire electrode and a third drive means which rotates at least one of the V type slot guides around a predetermined axis, so that the relative displacement between the piece of work and the wire electrode is controlled via the first and second drive means by two outputs of the numerical control apparatus, the V type slot guide is rotated via the third drive means by another output of the numerical control apparatus so that the V type slot guide is turned a predetermined angle in the direction of the above-mentioned relative displacement.
摘要翻译： 一种数控线切割放电加工机，其特征在于，包括控制至少三个轴上的工件供给的数控装置和线切割放电装置。 线切割放电装置包括一对在其间拉伸线的V型槽引导件，第一和第二驱动装置，其相对于线电极在两个轴线的方向上移动工件;第三驱动装置，其旋转 V型槽导轨中的至少一个围绕预定轴线，使得通过数字控制装置的两个输出端经由第一和第二驱动装置来控制工件与线电极之间的相对位移，V型槽 引导件通过第三驱动装置通过数字控制装置的另一输出旋转，使得V型槽引导件在上述相对位移的方向上转动预定角度。
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公开(公告)号：US4284939A
公开(公告)日：1981-08-18
申请号：US76548
申请日：1979-09-18
申请人： Shigeki Kawada , Yoshiki Fujioka , Naoto Ohta , Yutaka Koiwai
发明人： Shigeki Kawada , Yoshiki Fujioka , Naoto Ohta , Yutaka Koiwai
CPC分类号： H02H11/004 , G01R19/10 , G01R29/18 , G01R31/024 , H02H3/253
摘要： A device for detecting opposite phases and an open phase in an input three-phase voltage for a DC motor, wherein the input three-phase voltage is rectified by a three-phase bridge circuit and supplied to the armature of the DC motor. The input three-phase voltage is supplied to the three-phase bridge circuit when the maximum level is equal to or less than the reference voltage, while the input three-phase voltage is not supplied to the bridge circuit when the maximum level is greater than the reference voltage. In this case, both opposite phases and an open phase can be detected by using a common device. In addition, only two phases, such as U- and W-phases, are used for detecting opposite phases and an open phase no matter how these phases may be generated in any phase such as U-, V- or W-phase of the input three-phase voltage. As a result, the device is small in size, simple in electrical construction and low in cost.
摘要翻译： 一种用于在直流电动机的输入三相电压中检测相位相位和开路相位的装置，其中输入三相电压由三相桥式电路整流并提供给直流电动机的电枢。 当最大电平等于或小于参考电压时，输入三相电压被提供给三相桥式电路，而当最大电平大于输入三相电压时，输入三相电压不提供给桥式电路 参考电压。 在这种情况下，可以通过使用公共装置来检测相位相位和开路相位。 此外，只有两个相位，如U相和W相，用于检测相位相和开路相位，无论这些相位如何在任何相位中产生，例如U相，V相或W相的任何相位 输入三相电压。 结果，该装置尺寸小，电气结构简单，成本低。
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公开(公告)号：US4362976A
公开(公告)日：1982-12-07
申请号：US211974
申请日：1980-12-01
申请人： Yoshiki Fujioka , Yutaka Koiwai , Mitsuhiko Hirota
发明人： Yoshiki Fujioka , Yutaka Koiwai , Mitsuhiko Hirota
CPC分类号： H02P7/293 , Y10S388/902 , Y10S388/917 , Y10S388/921
摘要： Disclosed is a DC motor drive circuit adapted to prevent thyristor commutation failure when a thyristor-controlled three-phase full-wave reversible bridge undergoes a transition in operating mode from a power inversion mode to a power rectification mode. The drive circuit includes a thyristor-controlled three-phase full-wave reversible bridge whose firing phase is controlled in accordance with a speed deviation between the actual speed of a DC motor and a command speed, polarity discrimination means for discriminating the polarity of the speed deviation, firing phase narrowing means operable in the power inversion mode to narrow the thyristor firing phase down to a minimum firing phase due to a reversal in the polarity of the speed deviation, detection means for detecting an intermittence in armature current, and blocking means for blocking firing of the three-phase thyristor-controlled inverter for a prescribed period of time when the intermittence of the armature current has been detected, the operation mode of the inverter being changed over from the power inversion mode to the power rectification mode after the lapse of said prescribed time period.
摘要翻译： 公开了一种直流电动机驱动电路，其适用于在晶闸管控制的三相全波可逆桥经过工作模式从功率转换模式到功率整流模式的转变时，防止晶闸管换向故障。 驱动电路包括一个晶闸管控制的三相全波可逆桥，其起火相位根据直流电动机的实际速度与指令速度之间的速度偏差进行控制;极性鉴别装置，用于鉴别速度极性 偏离，点火相位变窄装置，其在功率反转模式下可操作，由于速度偏差的极性反转而将晶闸管起火阶段缩小到最小点火阶段，用于检测电枢电流的间歇的检测装置，以及用于 在检测到电枢电流的间歇时，三相晶闸管控制逆变器的停止点火规定的时间段，逆变器的动作模式在经过后从功率反转模式切换到功率整流模式 的规定时间段。
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公开(公告)号：US4327315A
公开(公告)日：1982-04-27
申请号：US89739
申请日：1979-10-31
申请人： Shigeki Kawada , Hiroshi Ishida , Yutaka Koiwai
发明人： Shigeki Kawada , Hiroshi Ishida , Yutaka Koiwai
CPC分类号： H02P27/045 , H02P27/048 , H02P2207/01 , H02P27/047
摘要： Disclosed is an induction motor drive apparatus which brings the actual speed of an induction motor into coincidence with a command speed by varying the frequency and effective value of a three-phase AC voltage applied to the induction motor. The apparatus includes an inverter for generating three-phase AC voltage, a speed deviation signal generator, an amplitude controller for controlling the amplitude of the speed deviation signal, an adder for adding together a voltage signal which conforms to the actual speed and the speed deviation signal which has been controlled, a rectangular waveform signal generator, and a pulse width modulator. The rectangular waveform signal generator is adapted to produce a three-phase rectangular signal whose frequency is proportional to the output voltage value of the adder. The rectangular signal of each phase is modulated in pulse width on the basis of the speed deviation, the inverter being controlled by each resulting pulse-width modulated rectangular signal to thereby vary the effective value of the three-phase AC voltage.
摘要翻译： 公开了一种感应电动机驱动装置，其通过改变施加到感应电动机的三相交流电压的频率和有效值来使感应电动机的实际速度与指令速度一致。 该装置包括用于产生三相AC电压的逆变器，速度偏差信号发生器，用于控制速度偏差信号幅度的振幅控制器，用于将符合实际速度和速度偏差的电压信号相加的加法器 已被控制的信号，矩形波形信号发生器和脉冲宽度调制器。 矩形波形信号发生器适于产生频率与加法器的输出电压值成比例的三相矩形信号。 每个相位的矩形信号基于速度偏差以脉冲宽度调制，逆变器由每个得到的脉宽调制矩形信号控制，从而改变三相交流电压的有效值。
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