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公开(公告)号：US5451846A
公开(公告)日：1995-09-19
申请号：US166743
申请日：1993-12-14
CPC分类号： H02P7/298 , H02P5/68 , Y10S388/911
摘要： A control system for energizing a direct current (DC) motor with alternating current (AC) power includes a first voltage sensor for a peak voltage of AC power; a second voltage sensor for a counter electromotive force (EMF) of the motor; a current sensor for an armature current of the motor; a digital processor having a first current controller responding to sensed armature current and a current reference, a cooperating second current controller responding to sensed peak voltage, sensed counter EMF and the current reference signal, and a gating circuit responding to the controllers; and a thyristor converter circuit sequentially gating portions of half cycles of AC power to the motor in response to firing signals from the gating circuit. The controllers may control a gate angle of the firing signals, the control system may include a third voltage sensor for a terminal voltage of the motor, and the armature current may have discontinuous and continuous waveforms. The processor may calculate a start of continuous current value which is a function of a calculated peak voltage of the AC power and a calculated counter EMF of the motor. The calculated counter EMF is sensed when an absolute value of sensed armature current is less than the start of continuous current value but, otherwise, the calculated counter EMF is related to motor terminal voltage. The calculated peak voltage of AC power is an average of an absolute value of a peak positive sensed voltage and an absolute value of a peak negative voltage under calculated discontinuous current conditions but, otherwise, the calculated peak voltage is the average plus a calculated commutation notch line voltage loss. The calculated commutation notch line voltage loss may be a function of the gate angle, the sensed armature current and the calculated peak voltage. The gate angle may be a sum of gate angles from the two controllers.
摘要翻译： 用于对具有交流（AC）功率的直流（DC）电动机通电的控制系统包括用于AC电力的峰值电压的第一电压传感器; 用于电动机的反电动势（EMF）的第二电压传感器; 用于电动机的电枢电流的电流传感器; 数字处理器，其具有响应感测的电枢电流和电流参考的第一电流控制器，响应于感测的峰值电压的协作的第二电流控制器，感测到的计数器EMF和当前参考信号，以及响应于控制器的门控电路; 以及晶闸管转换器电路，响应于来自所述选通电路的触发信号，顺序地将部分半周期的交流电力门控给所述电动机。 控制器可以控制点火信号的门角，控制系统可以包括用于电动机的端子电压的第三电压传感器，并且电枢电流可以具有不连续和连续的波形。 处理器可以计算连续电流值的开始，其是计算的交流电力的峰值电压和计算的电动机的计数器EMF的函数的函数。 当感测到的电枢电流的绝对值小于连续电流值的开始时，计算出的计数器EMF被检测到，否则计算的计数器EMF与电动机端子电压有关。 计算出的交流电力峰值电压是计算的不连续电流条件下峰值正感测电压的绝对值和峰值负电压的绝对值的平均值，否则计算的峰值电压是平均加上计算出的换向槽口 线路电压损失。 计算的换向陷波线电压损耗可以是门角，感测的电枢电流和计算出的峰值电压的函数。 门角可以是来自两个控制器的门角的总和。
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公开(公告)号：US5321343A
公开(公告)日：1994-06-14
申请号：US17804
申请日：1993-02-16
CPC分类号： H02P5/68 , H02M7/1626
摘要： A control system for one or more dc motors in which thyristor power modules selectively gate portions of half cycles of ac voltage to the motor field and armature windings, has digitally implemented parallel inner control loops for the armature which each generate an intermediate control signal to which proportional plus derivative control action has been applied. Logic selects the intermediate control signal which phases back firing pulses for the thyristor power modules the most for application to a common digital integrator which produces a control signal having proportional plus integral control action. The voltage across each of the thyristors is monitored and used to detect continuous and discontinuous current operation for adjusting integrator gain.
摘要翻译： 用于一个或多个直流电动机的控制系统，其中晶闸管功率模块选择性地将对电动机电场和电枢绕组的交流电压的半个周期的部分栅极部分数字地实现用于电枢的并联内部控制环路，每个控制环路产生中间控制信号， 比例加微分控制动作已被应用。 逻辑选择中间控制信号，其将用于晶闸管功率模块的触发脉冲相位最多的应用于公共数字积分器，其产生具有比例加积分控制动作的控制信号。 监控每个晶闸管上的电压，并用于检测连续和不连续的电流运行，以调整积分器增益。
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