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RDJR6係列電動機軟起動器

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目前,交流感應電動機以其低成本、高可靠性和少維護等優點5,在各種工業領域中得到廣泛應用。但是,它在直接起動時,存在著兩個缺點:首先,它的起動電流可高達額定電流的5~7倍,這就要求電網裕量比較大,而且降低電氣控製設備的使用壽命,增加維護成本。
其次,起動轉矩可達正常轉矩的兩倍,這會對負載產生衝擊,增加傳動部件的磨損和額外的維護。基於以上原因,產生了交流應電動機降壓起動設備。
傳統減壓起動方法有Y/△起動和自耦變壓器降壓兩種,每種都有各自的特點。電動機用Y/△起動時,在切換瞬間會出現很高的電流尖峰,會產生破壞性的動態轉矩,其引起的機械振動對電動機轉子、齒輪以及負載等都是非常有害的。自耦變壓器降壓起動設備體積龐大,成本高,而且還存在與負載匹配的電動機轉矩難控製等缺點。
由於傳統的降壓起動設備的許多缺點,這才出現了電子軟起動。RDJR6軟起動器功率部分由晶閘管組成,應用晶閘管的移相技術,使加到電動機上的電壓按一定規律逐漸達到全電壓,通過適當地控製參數,可以使電動機的轉矩和電流與負載要求得到很好的匹配。
RDJR6全數字軟起動器采用微處理器控製,實現交流異步電動機的軟起動、軟停止功能,保護功能齊全,廣泛應用於冶金、石油、礦山、化工等所有工業領域的電機傳動設備。
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