-
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。
-
公开(公告)号：US4475150A
公开(公告)日：1984-10-02
申请号：US372750
申请日：1982-04-28
CPC分类号： H02M5/4505 , H02H7/1216
摘要： A fault protective system for a load commutated inverter motor drive including an AC to DC source side converter coupled from an AC source to a DC to AC load side converter via a DC link circuit and wherein the load side converter supplies AC power of varying magnitude and frequency to the synchronous motor load. A pair of microcomputers interlinked by a common digital memory respectively control the inverters and interface with hardware type sensor means for detecting the occurrence of a plurality of different types of faults. Additionally, a number of stored instructional sets or programs are respectively included in both microcomputers to detect by software means another plurality of faults. The detection of a fault on either side of the link circuit is communicated to the respective computer which subsequently communicates with the other microcomputer to effect a coordinated protective action in response to thyristor cell failures, circuit failures, and abnormal operating conditions. Cell failure faluts include those instances where a thyristor cell actually fails due to an open or short circuit as well as those cases where a cell fails to commutate properly due to firing strategy problems. Cirucit failures include open and short circuits both in the supply line and the motor leads, while abnormal operating conditions involve such things as low line voltage or excessive motor voltage.
摘要翻译： 一种用于负载换向的电动机驱动器的故障保护系统，其包括经由DC链路电路从AC电源耦合到DC至AC负载侧转换器的AC至DC源侧转换器，并且其中所述负载侧转换器提供不同大小的AC电力， 频率同步电机负载。 由公共数字存储器互连的一对微型计算机分别控制逆变器并与硬件型传感器装置进行接口，以检测多种不同类型故障的发生。 另外，两个微型计算机中分别包括多个存储的指令集或程序，以通过软件来检测另外的多个故障。 将链路电路的任一侧的故障的检测通信给相应的计算机，该计算机随后与另一个微型计算机进行通信，以响应于晶闸管电池故障，电路故障和异常操作条件而进行协调的保护动作。 电池故障故障包括由于开路或短路而导致晶闸管电池实际故障的情况，以及由于触发策略问题，电池无法正确换向的情况。 Cirucit故障包括供电线路和电机引线中的开路和短路，而异常工作条件涉及低线路电压或电机电压过大等情况。
-
3.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。
-
公开(公告)号：US4230979A
公开(公告)日：1980-10-28
申请号：US895189
申请日：1978-04-10
CPC分类号： H02P21/36
摘要： A controlled current inverter system forms the basis of an a.c. motor drive system for furnishing the motor load with a variable frequency, variable magnitude a.c. current from an inverter which is supplied from a variable d.c. current source by way of a d.c. link including an inductor. Torque is the control parameter employed in the system and the motor speed and torque are controlled through the control of motor flux and motor current, by maintaining a controlled ratio between the direct and quadrature motor currents, through separate control paths to the d.c. source and the inverter. A third control path functioning on the difference between the desired and actual motor flux serves as a modifier to the main control paths to improve overall operation and control. Means associated with the basic control paths provide for dynamic braking of the motor.
摘要翻译： 受控电流逆变器系统形成了一个交流电流的基础。 电机驱动系统，用于以可变频率，可变幅度a.c.提供电机负载。 来自变频器供电的电流的电流 目前来源以d.c. 链路包括电感器。 扭矩是系统中使用的控制参数，通过控制电机磁通和电机电流，通过直接和正交电机电流之间的控制比例，通过单独的控制路径到直流电流来控制电机转速和转矩。 源和逆变器。 根据期望的和实际的电动机磁通之间的差异起作用的第三控制路径用作主控制路径的修正器，以改善整体操作和控制。 与基本控制路径相关联的装置提供电动机的动态制动。
-
5.发明授权Reversible variable frequency oscillator for smooth reversing of AC motor drives 失效可逆变频振荡器，用于交流电机驱动器的平滑反转
公开(公告)号：US4227138A
公开(公告)日：1980-10-07
申请号：US895136
申请日：1978-04-10
申请人： Paul M. Espelage , Loren H. Walker
发明人： Paul M. Espelage , Loren H. Walker
CPC分类号： H02P27/045
摘要： A variable speed ac motor drive such as a controlled current inverter drive with load angle control generates an inverter frequency command signal which at low speed has a large ripple component and a small dc component representing the desired frequency. A variable frequency oscillator is responsive only to the dc component and supplies timing pulses to a ring counter which generates thyristor gating signals in the forward and reverse phase sequence. Smooth reversing over a wide range of torque is realized, and multipulse operation is inherent at low speeds to modulate the inverter output and minimize cogging torque.
摘要翻译： 诸如具有负载角度控制的受控电流逆变器驱动器的可变速度交流电动机驱动器产生逆变器频率指令信号，其在低速时具有大的纹波分量和表示期望频率的小直流分量。 可变频率振荡器仅响应于直流分量，并将定时脉冲提供给环形计数器，该环形计数器在正向和反向相序中产生晶闸管门控信号。 实现了在宽范围的扭矩范围内的平滑反转，并且多脉冲操作在低速下是固有的，以调制逆变器输出并最小化齿槽转矩。
-
公开(公告)号：US4295086A
公开(公告)日：1981-10-13
申请号：US142696
申请日：1980-04-22
CPC分类号： H02P21/36
摘要： A controlled current inverter motor control system including a controlled source of direct current for supplying a variable frequency inverter by way of a direct current link circuit which includes, within the link circuit, a selectively insertable dynamic braking resistive element. Upon a call for a dynamic braking mode of operation, the source of direct current is short circuited and the normal operational or running control of the motor is discontinued. Special circuitry is provided which then forces a special frequency control of the inverter to thus control the angle between the motor flux and motor current to a prescribed value proportional to the extant value of a motor operating parameter (motor current or motor flux) prior to the insertion of the dynamic braking resistive element into the link circuit.
摘要翻译： 一种受控电流逆变器电动机控制系统，包括受控的直流电源，用于通过直流链路电路提供变频逆变器，所述直流链路电路在链路电路内包括可选择性地插入的动态制动电阻元件。 在呼叫动态制动操作模式时，直流电源短路，电机的正常运行或运行控制停止。 提供特殊电路，然后强制变频器的特殊频率控制，从而将电动机磁通和电动机电流之间的角度控制在与电动机工作参数（电动机电流或电动机通量）之间的现有值成正比的规定值之前 将动态制动电阻元件插入到链路电路中。
-
公开(公告)号：US4164015A
公开(公告)日：1979-08-07
申请号：US895188
申请日：1978-04-10
申请人： Paul M. Espelage , Loren H. Walker
发明人： Paul M. Espelage , Loren H. Walker
CPC分类号： H02M7/1623
摘要： A digital firing control circuit is disclosed for controlling the generation of firing pulses for the eight controlled rectifiers (thyristors) in a bridge power converter in five distinct operating modes as well as effecting a smooth continuous transition between modes. The circuit compares and combines a plurality of locally generated time related waveforms according to a predetermined control algorithm in response to an applied analog command voltage to control the d.c. output voltage as well as providing certain protection functions such as end stops or inversion limits. The locally generated time related waveforms comprise sets of square voltage signals generated in accordance with selected cross-overs of the line voltages of the a.c. sources as well as the cross-overs of six firing reference ramp voltage signals separated from each other by 60.degree. and extending 240 electrical degrees. One particular mode of interest exists at relatively low voltage levels wherein the phase leg thyristors are respectively rendered conductive for a period of 60.degree. in the range of firing angles from 90.degree. to 120.degree. with the neutral leg thyristors being fired 60.degree. after the phase thyristor firing, or at a firing angle of 150.degree. to 180.degree. .
摘要翻译： 公开了一种数字点火控制电路，用于以五种不同的操作模式控制桥式功率转换器中的八个可控整流器（晶闸管）的发射脉冲的产生，以及实现模式之间的平滑连续转变。 该电路响应于所施加的模拟命令电压，根据预定的控制算法比较和组合多个局部生成的时间相关波形，以控制直流 输出电压以及提供某些保护功能，例如端点停止或反转限制。 本地产生的时间相关波形包括根据交流电的交流产生的平方电压信号的集合。 来源以及六个点火参考斜坡电压信号的交叉，彼此间隔60°并延伸240电度。 一个特定的感兴趣的模式存在于相对低的电压水平，其中相位支路晶闸管分别在90°至120°的触发角度范围内导通60°的周期，中性支路晶闸管在相位之后60°发射 晶闸管烧制，或在150°至180°的点火角。
-
公开(公告)号：US4496899A
公开(公告)日：1985-01-29
申请号：US508599
申请日：1983-06-28
申请人： David L. Lippitt , Loren H. Walker
发明人： David L. Lippitt , Loren H. Walker
CPC分类号： H02J3/1842 , Y02E40/12 , Y02E40/22
摘要： The non-linear control characteristic of a force commutated current source inverter operating as a var generator is linearized to provide a similar dynamic response in both leading and lagging modes of operation by two inter-related control schemes. The first control scheme comprises a linear closed loop feedback which controls a thyristor firing circuit in response to a difference or error signal between a var command signal and an actual var feedback signal while the second control comprises a feed-forward non-linear network having a signal transfer function which models the non-linear control characteristic of the var generator and is operative to control the thyristor firing circuit in response to the summation of scaled values of the var command signal and the actual var feedback signal and wherein the scaled values provide a combined gain which is equal to unity.
摘要翻译： 作为无功发生器运行的力换向电流源逆变器的非线性控制特性被线性化，以通过两个相互关联的控制方案在前导和滞后运行模式中提供类似的动态响应。 第一控制方案包括线性闭环反馈，其响应于无级命令信号和实际无效反馈信号之间的差异或误差信号来控制晶闸管触发电路，而第二控制包括前馈非线性网络，其具有 信号传递函数，其对所述无功发生器的非线性控制特性进行建模，并且响应于所述变频指令信号和所述实际变差反馈信号的标定值的总和来控制所述晶闸管触发电路，并且其中所述定标值提供 组合收益等于统一。
-
9.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.
-
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.
-
-
-
-
-
-
-
-
-
搜索结果
57 条记录 (耗时 0.033 秒)
