AIO288/x
在拖动系统中,用变频器驱动电动机的目的就是实现调速,让电动机按照希望的方式运转。但不论系统是否采用调速,稳定运行是必须的,即要求系统在受到扰动时有自动恢复的能力。系统的负载特性不能依靠改变外加电气参数来改变,只能改变电动机自身的电气参数来实现。由于电动机机械特性曲线是由电动机本身多个电气参数决定的,通过改变这些电气参数,得到不同的人为机械特性,从而使新的人为机械特性曲线与负载特性曲线形成新的稳定交点,实现稳定速度调节。实现变频的方式主要有2种,即交-交变频和交-直-交变频。本项目采用交-直-交变频。 1.2.1变频改造节能点
1）、替换液耦调速方式，风机的速度直接由变频器调节电机转速来完成。省去原液偶的传动效率，减少中间损耗。 2）、直接通过调节电机的转速来实现调节风量的目的，降低风机的轴功率。 3）、间接好处：减去液偶维护维修量，减少该部分支出。 1.2.2变频调速优势
1）、降低了厂用电能耗：降低将近0.5%的厂用电能耗。 2）、变频器调节频率精度为0.01HZ，对电机可实现更精确的转速控制，可实现1转以内的精准控制。提高自动化水平，同时也提高电厂发电工艺。 3）、启动冲击少，只有额定电流0.5倍左右（工频启动电流是额定电流的6-7倍），对电网零冲击。 4）、电机为软启动，对电机机械部分以及线苞无冲击，可实现频繁启动。 AIO288/x
AIO288/x
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