140CPS22400双轮驱动
选用变频器的类型,按照生产机械的类型、调速范围、静态速度精度、起动转矩的要求,决定选用那种控制方式的变频器合适。所谓合适是既要好用,又要经济,以满足工艺和生产的基本条件和要求
需要控制的电机及变频器自身
1)电机的数。一般电机数以不多于(为宜,否则变频器容量就要适当加大。
2)转矩特性、临界转矩、加速转矩。在同等电机功率情况下,相对于高过载转矩模式,变频器规格可以降额选取。3)电磁兼容性。为减少主电源干扰,使用时可在中间电路或变频器输入电路中增加电抗器,或安装前置隔离变压器。一般当电机与变频器距离超过50m时,应在它们中间串入电抗器、滤波器或采用防护电缆
变频器功率的选用
系统效率等于变频器效率与电动机效率的乘积,只有两者都处在较高的效率下工作时,则系统效率才较高。从效率角度出发,在选用变频器功率时,要注意以下几点:
1)变频器功率值与电动机功率值相当时合适,以利变频器在高的效率值下运转。
2)在变频器的功率分级与电动机功率分级不相同时,则变频器的功率要尽可能接近电动机的功率,但应略大于电动机的功率。
3)当电动机属频繁起动、制动工作或处于重载起动且较频繁工作时,可选取大的变频器,以利用变频器长期、地运行。
4)经测试,电动机实际功率确实有富余,可以考虑选用功率小于电动机功率的变频器,但要注意瞬时峰值电流是否会造成过电流保护动作。
5)当变频器与电动机功率不相同时,则相应调整节能程序的设置,以利达到较高的节能效果
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