變頻軟起動器的全稱是分級交-交變頻軟起動器,也稱為離散變頻軟起動器。變頻軟起動器利用三相交流調(diào)壓回路,通過控制三相晶閘管的觸發(fā)順序,使晶閘管導通一個或者多個半波周期,對電網(wǎng)電壓進行斬波,使幾個工頻周波內(nèi)去掉一部分工頻上半波和一部分工頻下半波,實現(xiàn)電機端電源頻率變化的目的。幾種頻率波形示例如下圖:
廈門岳航計算機工程有限公司
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圖一幾種頻率的波形
由于這些頻率是對工頻交流電分頻得到的,是交流電源的一系列子頻率,不可能得到連續(xù)的頻率,所以稱之為分級變頻或者離散變頻。由于分頻是通過斬波的方式實現(xiàn)的,所以得到的波形是不連續(xù)的。
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