使其中一相绕组长期过载

使其中一相绕组长期过载，温升明显高于其他两相，最终导致绝缘老化加速并烧毁，这一案例说明，如果不从电源系统入手，仅仅维修电机本体是无法彻底解决问题的。在另一个案例中，

一台用于输送系统的电机频繁出现轴承损坏，维修人员多次更换轴承但问题依旧存在，后来通过振动分析发现，该电机安装基础存在轻微变形，同时联轴器对中偏差较大，导致运行过程中产生周期性附加载荷，使轴承长期承受额外应力，从而缩短使用寿命，在重新校正基础并精确对中后，轴承寿命显著延长，这类问题在现场中非常常见，说明机械安装质量对电机运行影响极大。在电气故障方面，匝间短路是一种发展性故障，

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其初期表现往往并不明显，例如电流略微增加或温度轻微升高，但随着运行时间延长，局部绕组会逐渐过热，最终发展为严重烧毁，因此在日常维护中，应定期检测绕组电阻和绝缘状态，一旦发现异常应及时处理，而不是等到故障扩大后再维修。在某化工厂中，一台电机在运行中出现轻微异味，但未引起重视