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一、依据负载特性挑选变频器
二、挑选变频器时应以实践电机电流值作为变频器挑选的依据,电机的额外功率只能作为参阅。其次,应充分思考变频器的输出富含高次谐波,会形成电动机的功率因数和功率都会变坏。
三、变频器若要长电缆运转时,变频器应扩大一档挑选或在变频器的输出端装置输出电抗器。
四、当变频器用于操控并联的几台电机时,必定要思考变频器到电动机的电缆的长度总和在变频器的容许范围内。
五、关于一些特别的应用场合,如高环境温度、高开关频率、高海拔高度等,此刻会导致变频器的降容,变频器需扩大一档挑选.
六、挑选用于高速电动机的变频器时,应比一般电动机的变频器稍大一些。
七、变频器用于变极电动机时,应充分留意挑选变频器的容量,使其大额外电流在变频器的额外输出电流以下。
八、驱动防爆电动机时,变频器没有防爆结构,应将变频器设置在危险场合之外。
九、运用变频器驱动齿轮减速电动机时,运用范围受到齿轮滚动有些光滑方法的制约。不要超越高转速容许值。
十、变频器驱动绕线转子异步电动机时,大多是利用已有的电动机。容易发生因为纹波电流而导致的过电流跳闸景象,所以应挑选比一般容量稍大的变频器。
十一、变频器驱动同步电动机时,与工频电源比较,降低输出容量10%~20%。
十二、关于压缩机、振动机等转矩动摇大的负载和油压泵等有峰值负载状况下,应了解工频运转状况,挑选比其大电流更大的额外输出电流的变频器。
十三、当变频器操控罗茨风机时,因为其起动电流很大,所以挑选变频器时必定要留意变频器的容量是否足够大。
十四、挑选变频器时,必定要留意其防护等级是否与现场的状况相匹配。
十五、单相电动机不适用变频器驱动。
假如单有变频器本体的高可靠性,而变频器选型和容量匹配不适当,构成的变频调速体系也不可能到达很高的可靠性,乃至无法工作,那么如何来保证变频调整体系正常运转呢?
咱们要保证变频器的容量匹配。依据负荷性质,准确选用变频器类型。总的原则即是啥性质负载特性配啥特性的变频器。
(1)恒转矩出产设备--在调速范围内,负载力矩根本稳定不变。应选具有恒转矩功能的变频器。其过载才能为150%额外电流维持1分钟。
(2)平方转矩出产设备--在调速范围内,负荷力矩与转速的平方成正比,即M∝n2,离心式风机,水泵为它的典型代表。具有M∝n2特性的变频器其过载才能较小,110%-120%额外电流过载1分钟,
(3)恒功率负荷出产设备-在调速范围内,转速低力矩大;转速高力矩小,即M?NC(常数)。典型设备如机床及卷绕组织。





















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