6ES7314-6CH04-0AB0 亿询就购
一、概述
某单位有台型号为C516A单柱式立床，经现场实际考察，原机床的拖动系统是采用一台功率为30kW的电动机作为主传动，电机以恒定转速运行，通过减速箱，液压系统实现速度调节。由于系统不能实现无级调速，液压系统维护工作量大。
二、机床液压系统变频改造方案
考虑到原有液压系统维护非常难，我们可以去掉原来的液压传动系统，直接用变频器拖动主轴电机，通过调节电机频率，来实现连续可调的转速。但是原来的横梁的升降、刀具的移动是靠原来的液压传动来完成的，所以不能完全去掉。如果要完全撤离液压传动，必须配备横梁、刀具的传动异步电动机。为了满足改造，必须满足以下要求才能保证机床可靠运行：
1、电机要求
通常要求用变频电机，或者普通电机加风扇以满足电机在低频的散热要求，并且要求电机调速范围广。
2、变频器的技术要求
1）要求低频力矩大
机床低速时需要具有强大的过载能力，变频器可以提供150%过载保护，能够满足设备要求。选用矢量变频器，低频时（1～10Hz）能达到150%额定转矩。
2）转矩动态响应速度快，稳速精度高
选用矢量变频器，能实现很好的动态响应效果，依据负载的变化，通过输出转矩的变化很快做出响应，从而实现转轴速度的稳定。
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