6ES7321-1FH00-9AJ0 调速箱
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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