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电机正反转怎么看
更新时间： 2020-11-07 00:00:00  

如果是正向启动，合上空气开关QF会接通三相电源，按下正向启动按钮SB3，KM1通电吸合并自锁，主触头闭合接通电动机，电动机这时的相序是L1、L2、L3，即正向运行。如果是反向启动，合上空气开关QF接通三相电源，按下反向启动按钮SB2，KM2通电吸合并通过辅助触点自锁，常开主触头闭合换接了电动机三相的电源相序，这时电动机的相序是L3、L2、L1，即反向运行。

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