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Achievement of Full 12-phase Rectifier and High Current System Excitation by Siemens 6RA70 Digital DC Drives

Hu Qiang (Steel Rolling Plant, Sichuan Changcheng Special Steel Co., Ltd., Pangang Group,Sichuan 621701)  
Taking transformation on electrical control system of the four roller rolling mill for instance, a method of applying 6RA70 Digital DC speed drives to realize the armature loop 12-phase rectifier circuit and a way of making use of 6RA70 internal small excitation current to control actual large excitation current were introduced in this paper.
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