描述
电气原理图是用来表明设备电气的工作原理及各电器元件的作用，相互之间的关系的一种表示方式。运用电气原理图的方法和技巧，对于分析电气线路，排除机床电路故障是十分有益的。电气原理图一般由主电路、控制电路、保护、配电电路等几部分组成。
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