西门子6DD1682-0CH2 低干扰

系统结构

实现软起动也是可以用开环系统来实现的，但是它使环境的到抑制扰动的影响比如温度等湿度等环境因素,：用闭环负反馈 控制系统来实现软起动更为稳定如图9所示，使起动电流作为反馈施加给软启的动控制环节，这一环节通过的可以计算的 规律来控制晶闸管触发角的改变,调节作电机定子的作用电压,：当电流反馈值超过电流限定值时，触发角不变直至电流降下降才 会变小,而输出电压随之上升至全压。 

(2)模型构建

由于本模型较复杂，为了实现系统的模块化管理，对构成反并联晶闸管电路、触发电路、软起动控制环节的多个标准基本模块 分别采用Simulink的封装技术，将它们集成在一起，形成新的功能模块，构建如图10软起动仿真模型。 

分析仿真结果，可知:起始电压设定的越低，转速上升就越快，起动时间就越短。上升速率设定的越大，转速上升的越快，起动 过程就越短。

三相异步电机是靠同时接入三相交流电源（相位差120度）供电的一类电动机。由于三相异步电机的转子与定子旋转磁场以相同的方向、不同的转速成旋转，存在转差率，所以叫三相异步电机。按照转子结构形式可分为：鼠笼式和绕线式两类。鼠笼式比绕线式异步电动机的价格便宜，结构简单、维护方便，在一般性的生产机械中应用为广泛。

启动电流带来的影响：启动电流过大使电压损失过大，启动转矩不够使电动机根本无法启动；使电动机绕组发热，绝缘老化，从而缩短了电动机的使用寿命；造成过流保护装置误动作、跳闸；使电网电压产生波动，进而形成影响连接在电网上的其他设备的正常运行。电动机启动时，在保证大小的启动转矩的前提下，还要求限制启动电流在允许的范围内。

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