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RDJR6系列电动机软起动器

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目前,交流感应电动机以其低成本、高可靠性和少维护等优点5,在各种工业领域中得到广泛应用。但是,它在直接起动时,存在着两个缺点:首先,它的起动电流可高达额定电流的5~7倍,这就要求电网裕量比较大,而且降低电气控制设备的使用寿命,增加维护成本。
其次,起动转矩可达正常转矩的两倍,这会对负载产生冲击,增加传动部件的磨损和额外的维护。基于以上原因,产生了交流应电动机降压起动设备。
传统减压起动方法有Y/△起动和自耦变压器降压两种,每种都有各自的特点。电动机用Y/△起动时,在切换瞬间会出现很高的电流尖峰,会产生破坏性的动态转矩,其引起的机械振动对电动机转子、齿轮以及负载等都是非常有害的。自耦变压器降压起动设备体积庞大,成本高,而且还存在与负载匹配的电动机转矩难控制等缺点。
由于传统的降压起动设备的许多缺点,这才出现了电子软起动。RDJR6软起动器功率部分由晶闸管组成,应用晶闸管的移相技术,使加到电动机上的电压按一定规律逐渐达到全电压,通过适当地控制参数,可以使电动机的转矩和电流与负载要求得到很好的匹配。
RDJR6全数字软起动器采用微处理器控制,实现交流异步电动机的软起动、软停止功能,保护功能齐全,广泛应用于冶金、石油、矿山、化工等所有工业领域的电机传动设备。
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