3HAB2221-1
3HAB2221-1
3HAB2221-1
再生能量经逆变部续流二极管对变频器直流储能电容器充电,使直流母线电压上升,这就是再生过电压。因再生过电压的过程中产生的转矩与原转矩相反,为制动转矩,因此再生过电压的过程也就是再生制动的过程。
换句话说,消除了再生能量,也就提高了制动转矩。如果再生能量不大,因变频器与电机本身具有20的再生制动能力,这部分电能将被变频器及电机消耗掉。若这部分能量过了变频器与电机的消耗能力,直流回路的电容将被过充电,变频器的过电压保护功能动作,使运行停止。为避免这种情况的发生,必须将这部分能量及时的处理掉,同时也提高了制动转矩,这就是再生制动的目的。
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Allen-Bradley 厦门泰尼电气有限公司
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