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所谓“直流制动”，一般指当变频器的输出频率接近为零，电机的转速降低到一定数值时，变频器改向异步电动机定子绕组中通入直流，形成静止磁场，此时电动机处于能耗制动状态，转动着的转子切割该静止磁场而产生制动转矩，使电动机迅速停止。
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厦门仲鑫达自动化设备有限公司
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在电动机制动过程中，由于变频器输出频率逐渐降低，则定子绕组内的同步磁场转速低于转子转速，电动机处于再生制动过程，此时旋转系统存储的动能转换成电能热损耗的形式消耗于异步电动机的转子回路中，为防止电动机减速过程中所形成的再生发电制动以及直流制动过程中的能量回馈，造成变频器和电机的损坏，需串入专用制动单元／制动电阻。在通常电动机的制动过程中，电动机先减速，电动机同步旋转磁场转速低于转子转速，工作点在同一转速下由A点跳至B点，即从第一象限过渡到第二象限称之为同一转速下特性的跳转，则电机得到反方向的制动转矩T进入发电制动状态，拖动系统迅速降速，当低于某一转速后，向定子绕组输入直流，形成固定磁场，产生制动转矩。在这一过程中，电机将经过再生发电制动和能耗制动而最终停止。 A6X30013318 DR,AC,460V,3PH,3KW,8A,CP +OPTS Siemens
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