1394-SR9AF

发布时间:2016-11-17

1394-SR9AF

1394-SR9AF

1394-SR9AF

为解决以上问题,现采用另一项电力电子产品“软启动”器,它基本原理是改变晶闸管的导通角改变输出电压,使电机在启动和停机过程中,端电压可以按照预先设定的方式逐渐变化,从而使启动和停机过程平稳。如果是启动一台电机,软启动将逐渐增大晶闸管的导通角,使电动机端电压逐渐升高,水泵平稳升速完成启动过程。如果是关闭一台电机,软启动内的晶闸管的导通角将由大逐渐减小,逐渐降低输出电压,使正在运转的电机平稳停机。 高性能的软启动及控制系统允许用一台软启动顺序带动多台电机完成软启、软停操作比如启动 1# 电机 , 软启动晶闸管的起始导通角为零 , 将 KM11 闭合,然后软启动晶闸管的导通角由小变大,电机端电压逐渐升高到电网电压,  一台软启动实现多台电机软启、软停控制主电路图 电机可较平稳升速完成启动过程。此时电机的端电压与电网电压同频率,同相位 , 软启动器的晶闸管完全导通 , 其输出电压接近电网电压 , 这样 , 可将 KM21 闭合,使软启器旁路 , 然后 KM11 断开,软启动退出运行。

厦门泰尼电气有限公司
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