The fixed screw in synchrous motor is not fixed. The antenna motor rotates with synchrous motor. The signal line was broken by the rotation.

同步电机的固定螺丝没有固定，天线电机随同步电机一起转。同步电机的信号线被绞断了。

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Firstly, the dynamic equation of SA antenna rotation driven by two-phase permanent magnetic stepper motor was derived. Then the structured model uncertainties were described.

首先推导出了由两相永磁步进电动机驱动单址天线转动的动态方程，描述了系统存在的模型不确定性。

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