Abstract：As for the resonance problem brought by the coupling between the stepping movement of the stepping motor and the flexibility of the solar array in the conventional solar array drive system, permanent magnet synchronous motor (PMSM) is proposed to drive the flexible load. Then based on Lagrange principle, the dynamic equation of the flexible load is derived. Combined with the mathematical model of PMSM, the mathematical model of the system that flexible driven directly by PMSM is built. Then the flexible driven system is controlled via closed-loop field orientation control strategy, and the open loop transfer function of current loop and speed loop is derived. Compared with the rigid load PMSM driven system, the influence of the flexibility on the current loop and the speed loop is analyzed. Two kinds of PI parameter tuning method, i.e. the pole placement method and the traditional method based on type II system, are proposed. Finally, simulation and experimental results have verified the parameter tuning method and the analysis process.
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2017, Vol. 32 
