NFTP01
NFTP01
NFTP01
异步电机启动性能主要有两个指标:启动电流倍数和启动转矩倍数,软启动器在启动时通过改变加在电机上的电源电压,以减小启动电流、启动转矩。电动机传统启动方式有自耦减压、Y/△减压等方式,其共同特点是控制线路简单,启动转矩不可调并有二次冲击电流,对负载有冲击转矩。软启动可标准电机硬启动电流的50%,是高效电动机硬启动电流的20%。软启动的限流特性可有效限制浪涌电流,避免不必要的冲击力矩以及对配电网
络的电流冲击,有效地减少线路刀闸和接触器的误触发动作;对频繁启停的电动机,可有效控制电动机的温升,延长电动机的寿命。目前应用较为广泛、工程中常见软启动器是晶闸管(SCR)软启动。SCR软启动原理:在三相电源与电机间串入三相联晶闸管,利用SCR移相控制原理,改变其触发角,启动时电机端电压随SCR的导通角从零
逐渐上升,就可调节输出电压,电机转速逐渐增大,直至达到满足启动转矩的要求而结束启动过程;软起动器的输出是一个平稳的升压过程(且可具有限流功能),直到SCR全导通,电机在额定电压下工作;
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厦门泰尼电气有限公司
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【产品质保】 1 年
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