R88D-UA12H
R88D-UA12H
R88D-UA12H
5、电动机使用工频电源驱动时,电压下降则电流增加;对于变频器驱动,如果频率下降时电压也下降，那么电流是否增加?
频率下降(低速)时,如果输出相同的功率,则电流增加,但在转矩一定的条件下,电流几乎不变。
6、采用变频器运转时，电机的起动电流、起动转矩怎样?
采用变频器运转，随著电机的加速相应提高频率和电压，起动电流被限制在150%额定电流以下(根据机种不同，为125%~200%)。用工频电源直接起动时，起动电流为6~7倍，因此，将产生机械电气上的冲击。采用变频器传动可以平滑地起动(起动时间变长)。起动电流为额定电流的1.2~1.5倍，起动转矩为70%~120%额定转矩;对于带有转矩自动增强功能的变频器，起动转矩为以上，可以带全负载起动。
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