Modeling and Evaluation of Cycloconverter-Fed Two-Stator-Winding SAG Mill Drive—Part I: Modeling Options


Typical drive configurations of high-capacity SAG mills use a two-stator-winding vector-controlled synchronous motor, with a 30 $^circ $ shift between the two windings, fed by a two-secondary delta-delta-wye power transformer and 2 six-pulse cycloconverters. This paper presents and evaluates three different modeling options for the SAG mill drive. The first possibility considers an entire model in section and $qd0$ variables of the 2-stator-winding synchronous motor fed by 2 six-pulse cycloconverters. The second option develops a winding rotation transformation to get the same one-stator-winding synchronous motor, which is fed by a 12-pulse cycloconverter. The third model considers the equivalent one-stator synchronous motor fed by an ideal converter that produces purely sinusoidal voltage and current waveforms. Each model is evaluated throughout steady state, step speed commands, and step load disturbances. Responses are compared to field records of an eight.two-MW SAG mill, confirming the accuracy of the developed models.

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