However , the keystone of this method is to develop variable frequency power supply of high quality.

研制高性能的异步电动机变频电源,是交流调速的关键所在.

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Industry wide electronic transformers, motors, variable frequency power supply and other winding capacitors used insulating material.

广泛作为电子工业中变压器 、 马达 、 线圈电容器及变频电源供应器等缠绕用之绝缘材料.

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