详细分析了交流接触器在不同使用条件下的闭合与分断时触点两端电压与回路电流情况，并研究了AC1～AC4工作制下的控制时序。
The conditions of voltage between contactors and current in main circuit under different using types are analyzed in detail, then designed the control sequences with working mode AC1-AC4.
介绍了空心线圈电流互感器的工作原理和特点，设计了适于此种互感器的交流采样和处理电路，详细介绍了软件的处理过程。
This paper introduces the principle and characteristic of the air-core coil current transformer, designs AC-sampling and processing circuit, and introduces the process of software detail.
根据交流电动机的工作原理，分析讨论其轴电流产生的原因和表象，提出了防止轴电流产生的方法。
Based on the work principle of AC motor, the article analyzes the cause and phenomenon of alternating-current motor and puts forward the method of removing shaft current.
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