如何选择直流接触器来控制直流电机？
Date: 2021-09-29 16:06:23
选择直流接触器控制直流电机时，应考虑以下问题：
(1) 有使用类别数据的接触器应根据电机的使用类别进行选择。
(2) 接触器的额定电压和额定电流(或额定控制功率)不得低于电动机的相应值。
(3) 如果使用接触器控制具有重复短时工作制或短时工作制的电机，接触器的额定加热电流和额定工作频率不得低于电机实际运行的等效有效电流和工作频率。
(4) 由于直流接触器存在严重的电流问题，应注意使用降容器。接触器无需断开电路中低于其额定电流值20%的电流。为避免接触器不能断开的临界电流问题，对于额定电流小于40A的电机，应选择串联吹磁线圈额定电流略大于电机额定电流的接触器。为了更好地解决接触器的临界电流问题，最好选用永磁吹磁式交流接触器。
(5) 当使用整流器(尤其是晶闸管整流器)控制直流电机时，最好选择交流操作的DC I电流接触器(如cz21-26或cz22-63)来代替传统的直流操作的DC接触器。这样可以简化控制电路，节省直流控制电源(包括变压器、整流器等)的成本。
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