WESTINGHOUSE 5X00105G14

WESTINGHOUSE 5X00105G14

变频器对于电机的影响还是有的，普通电机设计都是按恒频恒压设计的。不会完全适应变频调速的要求，那么变频器怎么影响三相异步电动机呢？
1、电动机对频繁启动、制动的适应力
采用变频器供电后，电动机可以在很低的频率和电压下以无冲击电流的方式启动，并可利用变频器所供的各种制动方式进行快速制动，为实现频繁启动和制动创造了条件。因此，电动机的机械系统和电磁系统处于循环交变力的作用下，给机械结构和绝缘结构带来疲劳和加速老化问题。
2、低转速时的冷却
异步电动机的阻抗并不理想，当电源频率较底时，电源中高次谐波所引起的损耗较大。
普通异步电动机再转速降低时，冷却风量与转速的三次方成比例减小，致使电动机的低速冷却状况变坏，温升急剧增加，难以实现恒转矩输出。
3、谐波电磁噪音与震动
变频电源中含有的各次时间谐波与电动机电磁部分的固有空间谐波相互干涉，形成各种电磁激振力。异步电动机采用变频器供电时，会使由电磁、机械、通风等因素所引起的震动和噪声变的更加复杂。
由于电动机工作频率范围宽，转速变化范围大，各种电磁力波的频率很难避开电动机的各构件的固有震动频率。当电磁力波的频率和电动机机体的固有振动频率一致或接近时，将产生共振现象，从而加大噪声。






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