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1.发明授权Excitation current control for induction motor drive using load commutated inverter circuit 失效感应电动机驱动的励磁电流控制采用负载换向逆变电路
公开(公告)号：US4600874A
公开(公告)日：1986-07-15
申请号：US705962
申请日：1985-02-26
CPC分类号： H02J3/1892 , H02M5/4505 , H02M7/525 , H02P25/024 , H02P27/06 , H02P2201/13 , H02P2207/01
摘要： A system for controlling the operation of an alternating current induction motor having windings supplied by electrical power from the polyphase alternating current source includes a load commutated inverter circuit which is connected between the power source and the induction motor for furnishing electrical power to the motor. Controllers responsive to a command signal and a feedback signal indicative of motor operating parameters control the operation of said load commutated inverter circuit. There is further provided a fixed capacitor circuit connected between the windings of the motor for supplying reactive volt amperes (VARs) to said load commutated inverter circuit and said motor. Finally, there is provided a variable VAR generator connected between the motor windings for supplying VARs to said load commutated inverter circuit and said motor in response to the output of a third feedback control path which is also responsive to a command signal and prescribed operating parameter(s) of said load and/or said commutated inverter.
摘要翻译： 用于控制具有来自多相交流电源的电力提供的绕组的交流感应电动机的操作的系统包括连接在电源和感应电动机之间的用于向电动机提供电力的负载换向逆变电路。 响应于命令信号的控制器和指示电动机操作参数的反馈信号控制所述负载换向逆变器电路的操作。 还提供了一个固定电容器电路，其连接在电动机绕组之间，用于向所述负载换向逆变器电路和所述电动机提供无功伏安（VAR）。 最后，提供了连接在电动机绕组之间的可变VAR发生器，用于响应于第三反馈控制路径的输出而向所述负载换向逆变器电路和所述电动机提供VAR，该第三反馈控制路径也响应于指令信号和规定的操作参数 s）所述负载和/或所述换向逆变器。
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公开(公告)号：US4602198A
公开(公告)日：1986-07-22
申请号：US705961
申请日：1985-02-26
申请人： Herbert W. Weiss , Loren H. Walker
发明人： Herbert W. Weiss , Loren H. Walker
CPC分类号： H02J3/1892 , H02M5/4505 , H02M7/525 , H02P25/024 , H02P27/06 , H02P2201/13 , H02P2207/01
摘要： A system for controlling the operation of an alternating current induction motor having windings supplied by electrical power from the polyphase alternating current source includes a load commutated inverter circuit which is connected between the power source and the induction motor for furnishing electrical power to the motor. Controllers responsive to a command signal and a feedback signal indicative of motor operating parameters control the operation of said load commutated inverter circuit. There is further provided a fixed capacitor circuit connected between the windings of the motor for supplying reactive volt amperes (VARs) to said load commutated inverter circuit and said motor. Finally, there is provided a variable VAR generator connected between the motor windings for supplying VARs to said load commutated inverter circuit and said motor in response to the output of a third feedback control path which is also responsive to a command signal and prescribed operating parameter(s) of said load and/or said commutated inverter.
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3.发明授权Flux control for induction motor drive using load commutated inverter circuit 失效感应电动机驱动使用负载换向逆变电路的磁通控制
公开(公告)号：US4607206A
公开(公告)日：1986-08-19
申请号：US705964
申请日：1985-02-26
CPC分类号： H02J3/1892 , H02M5/4505 , H02M7/525 , H02P25/024 , H02P27/06 , H02P2201/13 , H02P2207/01
摘要： A system for controlling the operation of an alternating current induction motor having windings supplied by electrical power from the polyphase alternating current source includes a load commutated inverter circuit which is connected between the power source and the induction motor for furnishing electrical power to the motor. Controllers responsive to a command signal and a feedback signal indicative of motor operating parameters control the operation of said load commutated inverter circuit. There is further provided a fixed capacitor circuit connected between the windings of the motor for supplying reactive volt amperes (VARs) to said load commutated inverter circuit and said motor. Finally, there is provided a variable VAR generator connected between the motor windings for supplying VARs to said load commutated inverter circuit and said motor in response to the output of a third feedback control path which is also responsive to a command signal and prescribed operating parameter(s) of said load and/or said commutated inverter.
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公开(公告)号：US4449087A
公开(公告)日：1984-05-15
申请号：US333933
申请日：1981-12-23
CPC分类号： H02P25/024 , H02P2201/13
摘要： A load commutated inverter synchronous motor drive system wherein a thyristor firing control of the inverter is determined by the amplitude of pesudo flux waveforms which are derived from the integral of the line voltages coupling the inverter to the motor being driven. A firing strategy is provided based on the premise that optimum thyristor firing in a load commutated inverter operating at a leading power factor occurs at a point just below the peak of the forthcoming pseudo flux waveform which point comprises an amount of volt-seconds necessary to effect current commutation plus a nominal safety margin. The determination and control is implemented, preferably, in a software phase lock loop but can, when desirable, be implemented in hardware.
摘要翻译： 一种负载换向的逆变器同步电动机驱动系统，其中逆变器的晶闸管点火控制由从耦合到所驱动的电动机的线路电压的积分导出的pesudo通量波形的幅度确定。 基于这样的前提提供了一种点火策略，即在刚刚低于即将到来的伪通量波形的峰值的点处的负载换向逆变器中以最佳功率因数工作的最佳晶闸管点火发生在该点包括所需的伏秒的量 当前换向加上名义上的安全幅度。 确定和控制优选地在软件锁相环中实现，但是当期望地可以在硬件中实现时。
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5.发明授权Method and apparatus for controlling an alternating current motor particularly at low speeds 失效特别是在低速下控制交流电动机的方法和装置
公开(公告)号：US4873478A
公开(公告)日：1989-10-10
申请号：US282902
申请日：1988-12-12
申请人： Herbert W. Weiss
发明人： Herbert W. Weiss
摘要： A system for controlling a polyphase electric motor, particularly at low speeds, using a load commutated inverter includes the generation of half sine wave signals within a range of desired frequencies which are subsequently converted to single phase alternating current power for application to selected windings of the motor. In a single channel polyphase embodiment, motor starting is achieved using zero current commutation and normal phase control. A two channel embodiment results in what amounts to two phase operation of the motor.
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6.发明授权Method and apparatus for controlling an alternating current motor load using plural controlled-current inverter circuits 失效使用多个受控逆变器电路来控制交流电动机负载的方法和装置
公开(公告)号：US4349772A
公开(公告)日：1982-09-14
申请号：US219734
申请日：1980-12-23
申请人： Herbert W. Weiss
发明人： Herbert W. Weiss
CPC分类号： H02P27/06 , H02P27/045 , H02P27/048 , H02P27/047
摘要： A plurality of controlled current inverter circuits each including a plurality of electrical current conducting legs having controlled rectifiers and associated commutating capacitors are connected in parallel and individually controlled to collectively supply an alternating current motor load with electrical power. At high speed, low required torque conditions, less than the total number of inverter circuits are maintained operative to thereby maintain sufficient current within the effective inverter circuit or circuits to sustain effective inverter commutation.
摘要翻译： 多个受控电流逆变器电路各自包括具有受控整流器和相关联的换向电容器的多个电流传导支路并联连接并单独控制以共同地提供具有电力的交流电动机负载。 在高速时，要求低的转矩条件小于逆变器电路的总数，保持有效的逆变器电路或电路内的足够的电流以维持有效的逆变器换向。
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公开(公告)号：US4156896A
公开(公告)日：1979-05-29
申请号：US894970
申请日：1978-04-10
申请人： Herbert W. Weiss
发明人： Herbert W. Weiss
CPC分类号： H02M7/1626
摘要： A method of controlling the thyristors of an a.c. to d.c. bridge converter, having neutral connected thyristors, at relatively low power levels by gating each phase leg thyristor conductive for a predetermined minimum period within the electrical separation between adjacent line to neutral phase voltages and immediately gating the respective neutral leg thyristor conductive for the remainder of the period such that there are no intervals in the cycle when both neutral leg thyristors are in conduction. In a three phase bridge converter system, this requires at least 60 electrical degrees minimum conduction for each phase leg thyristor followed by a 60.degree. conduction of the neutral leg thyristors. In any event, the sum of the phase leg conduction and the neutral leg conductions is always equal to 120.degree. in a three phase system. This control method improves the response to a reverse command voltage by assuring that a phase leg thyristor is conductive, thus making a transition from the first to fourth quadrant operation at maximum possible speed.
摘要翻译： 一种控制交流电的晶闸管的方法。 到达 桥式变流器，具有中性连接的晶闸管，在相对较低的功率水平下，通过门控每个相位支路晶闸管在相邻线路与中性相电压之间的电气间隔内导通预定的最小周期，并立即门控相应的中性支路晶闸管导通其余的 周期，使得当两个中性腿晶闸管导通时，循环中没有间隔。 在三相桥式变流器系统中，对于每个相桥式晶闸管，这需要至少60度的电气度，然后是60°导通的中性支路晶闸管。 无论如何，在三相系统中，相腿传导和中性腿传导的总和总是等于120°。 该控制方法通过确保相位腿晶闸管导通而提高对反向指令电压的响应，从而以最大可能的速度从第一到第四象限运行转变。
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