求翻译：电动机软启动器是一种集电机软启动、软停车、轻载节能和多种保护功能于一体的电机控制装置。本设计研究PLC技术在电动机软启动器控制系统中的运用，设计硬件电器控制电路，编写控制软件，实现软启动，即采用PLC对系统加以控制，启动过程中通过PLC调节改变液态电阻软启动器电阻液中的动极板到静极板的距离，从而改变串入电动机定子回路中液阻阻值的大小，使电动机匀速加速至额定转速，最后切除液阻，实现软启动。是什么意思？

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soft-start motor, which is a soft-start motor set, soft light, and car parking and a range of energy conservation in a motor control unit. This study design PLC technology in soft starter motor in the control system design, hardware appliances control circuit, control software, and preparation for s

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