通过电阻值判断：单相电机的主副绕组的电阻值通常是不同的。可以使用万用表或电阻表等工具来测量单相电机的主副绕组的电阻值，一般情况下，主绕组的电阻值要远远低于副绕组的电阻值。

  通过端子标识判断：单相电机的主副绕组的接线端子通常是不同的。可以查看单相电机的接线端子标识，一般情况下，主绕组的接线端子标识为P1和P2，副绕组的接线端子标识为S1和S2。

  通过铁芯结构判断：单相电机的主副绕组通常绕制在不同的铁芯上，可以通过观察单相电机的铁芯结构来判断主副绕组。

  需要注意的是，在判断单相电机的主副绕组时，应特别注意电路的安全，避免产生电击或火灾等危险。如果不确定自己的能力，建议请专业人士进行检查和维修。
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Fanuc GMF ROBOTICS Power Supply EE-0874-020

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