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1、电阻测量法
用万用表或者电桥等工具测量直流电机的绕组电阻值，如果测量的电阻值与理论值相差较大，或者电阻值变化较大，说明电机的绕组可能存在开路或者短路等问题。
2、电压测量法
将直流电机的正负极分别接到直流电源的正负极上，测量电机的电压和电流值，根据电压和电流的关系计算出电机的转矩和转速。如果测量的电压、电流、转矩、转速等数值与理论值相差较大，说明电机可能存在转子断条、轴承磨损等问题。
需要注意的是，测量直流电机好坏时，需要先进行检查，断开电源并确保电机处于停止状态，以避免电机运转过程中造成意外伤害。此外，需要根据具体的测量方法和电机类型选择合适的测量工具和方法，并进行专业的分析和判断。
直流电机的接线方式与电机的型号、功率、电源电压等参数有关。一般来说，直流电机的接线可以分为两种类型：串联连接和并联连接。
串联连接方式是将电机的正极和负极依次相连，从而将电机的电势差累加，以增加电机的转矩和转速。串联连接适用于电压较低的电机和需要较高转矩和转速的应用场合。
并联连接方式是将电机的正极和负极分别与电源的正负极相连，从而将电源电压直接施加在电机上，以提高电机的转矩和效率。并联连接适用于电压较高的电机和需要较率和较小启动电流的应用场合。
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