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八、电动机过热甚至冒烟
故障原因①电源电压过高；②电源电压过低，电动机又带额定负载运行，电流过大使绕组发热；③修理拆除绕组时，采用热拆法不当，烧伤铁芯；④电动机过载或频繁起动；⑤电动机缺相，两相运行；⑥重绕后定于绕组浸漆不充分；⑦环境温度高电动机表面污垢多，或通风道堵塞；
故障排除①降低电源电压（如调整供电变压器分接头）；②提高电源电压或换粗供电导线；③检修铁芯，排除故障；④减载；按规定次数控制起动；⑤恢复三相运行；⑥采用二次浸漆及真空浸漆工艺；⑦清洗电动机，改善环境温度，采用降温措施
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新闻:深圳贴合机专用步进电机HSTM57-1.8-S-51-6-3销售中心
两用扳手的用途与特点两用扳手是扳手众多种类中的一种。它一端与单头呆扳手相同，另一端与梅花扳手相同，两端拧转相同规格的螺栓或螺母。两用扳手的用途：大型工业用两用扳手适用于石油、化工、冶金、发电、炼油、造船、石化等行业。是设备安装、装置及设备检修、维修工作中的必需工具。两用扳手分为公制和英制两种。两用扳手的材料：两用扳手采用45号中碳钢或4Cr合金钢整体锻造加工制作。两用扳手的制造标准：GB/T4392-1995（敲击呆扳手和敲击梅花扳手）。
新闻:深圳贴合机专用步进电机HSTM57-1.8-S-51-6-3销售中心
某纺织厂的空调采用的是双速电机进行调速，如果能改用变频器进行无级调速，则可更好地进行量调节，按车间余热量进行送风。同步电动机调速，可通过改变电源频率和电极对数来实现；异步电动机调速通过改变电源频率、电机对数和转差率方法来实现。
变频调速是改变供电的频率，从而改变电动机转速的调速方法，它基本保持了异步电动机固有的特性，即硬度高和转速差小的特点，所以变频调速法具有效率高、调速范围宽、精度高和调速平滑等优点。
变频调速分电压变频调速、电流变频调速和脉宽调制（PWM）型变频调速三种类型。
交流电源经二级管组成的桥式整流和电容滤波后，成为恒定的直流电压，加之由大功率晶体管构成PWF型变频器，使控制电路按一定规律控制PWM逆变器的各个晶体管的通和断，从而在逆变器输出端获得一组等幅而不等宽的矩形脉冲波。
新闻:深圳贴合机专用步进电机HSTM57-1.8-S-51-6-3销售中心
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