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新莆京股份

CHINSC

节能环保 绿色科技 和谐发展 造福人类

19

2017

-

09

滑差电机变频改造节能应用方案

作者:


  一、滑差电机电气传动系统分析

  1、电能浪费严重。电磁调速电机是一种交流恒转矩调速电动机。其本身由普通鼠笼式异步电动机、电磁转差离合器、测速发电机和控制装置组成。其中电动机作为拖动原动机,电磁转差离合器作为转矩传输器,将电动机的输出转矩传递到负载侧。

  调速功能是由电磁转差离合器来完成的,该离合器有两个旋转部件,一个是圆筒形电枢,一个是爪形磁极。电枢与电机转子同步旋转:当励磁线圈通道直流电后,空隙中产生交变磁场,电枢切割磁力线产生涡流,涡流产生的磁场与磁极磁场相互作用,产生转矩,输出轴的转向与电机相同。在同一负载条件下,输出轴的转速取决于励磁电流的大小,电流越大转速越高,反之则低。当无励磁电流时,输出轴就不能输出转矩,调节励磁电流就可调节电机转速。

  2、电磁调速电机特性比较软,虽然有转速反馈信号检测,但调速不稳定,大大影响产品质量。

  3、电磁调速电机结构复杂,发热量大,对生产维修和生产环境影响大。

  二、传动系统采用变频器的方式

  变频器在调速范围,起动特性,动态影响,调节精度,输出精度,输出特性,经济指标和操作监视方便性等各个方面都优于电磁调速。改造方式不外乎有以下三种:

  1、将原动力更换为普通Y系列鼠笼式电动机,加变频器控制调节。

  2、原滑差电机不用更换,只需在转差离合器部分转眼攻丝,然后用螺杆锁紧即可,使电机轴与负载轴作硬性连续(将励磁电源断开)。当变频器发生故障时,将螺杆松开后,接上控制电源又可用滑差调速。

  3、原滑差电机不用更换,将调速板旋纽调到最高速度不变。用变频器调节速度。

  三、采用变频器效益分析

  根据实际情况可知,采用变频器可达到30% -70%的节能效果,工艺要求转速越低则节电率越高。以一台37KW滑差电机为例37(KW)X24(小时)X12(月)X30%=95904KW

  按每度电0.5元代算,可节约电费:95904X0.5=47952元。

这里是占位文字

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