注意，如果电流极性接反，会使伺服驱动器不能工作。

Attention, if current polarity inverse connected, will lead to servo drive out of service.

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本文简单介绍了现有两种反辐射导弹（ARM ）导引头随动系统，液压伺服随动系统和电动平台随动系统。

Describes briefly two existing anti-radiation missile(ARM) seeker follow-up systems, viz. the hydraulic pressure servo ARM seeker follow-up system and electromotion ARM seeker follow-up system.

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