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近三十多年来,国外对晶闸管三相交流调压电路进行了广泛的研究,在工业应用领域得到广泛应用,在某些领域应用显示出独特的技术优势.文章对异步电动机软启动做了分析.“,”Nearly 30 years,thyristor three-phase AC regulates voltage circuit what studied widely abroad,and it has much application in the industry field.The application of thyristor exhibits particular technology superiority in some fields.