<晴风村n style="box-sizing: border-box; font-size: 16px;"><晴风村n style="box-sizing: border-box; font-family: 宋体;">晴风村n>晴风村n>
<晴风村n style="box-sizing: border-box; font-size: 16px;"><晴风村n style="box-sizing: border-box; font-family: 宋体;">
晴风村n>晴风村n>
<晴风村n style="box-sizing: border-box; font-size: 16px;"><晴风村n style="box-sizing: border-box; font-family: 宋体;">一晴风村n><晴风村n style="box-sizing: border-box; font-family: Calibri;">.晴风村n><晴风村n style="box-sizing: border-box; font-family: 宋体;">负载的问题导致电动机过热晴风村n>晴风村n>
<晴风村n style="box-sizing: border-box; font-size: 16px;"><晴风村n style="box-sizing: border-box; font-family: Calibri;">1.晴风村n><晴风村n style="box-sizing: border-box; font-family: 宋体;">电动机过载运行晴风村n>晴风村n>
<晴风村n style="box-sizing: border-box; font-family: Calibri; font-size: 16px;">当设备不配套,电动机的负载功率大于电动机的额定功率时,电动机长期过载运行(即小马拉大车),会导致电动机过热。维修过热电动机时,应先搞清负载功率与电动机功率是否相符,以防盲无目的的拆卸。晴风村n>
<晴风村n style="box-sizing: border-box; font-size: 16px;"><晴风村n style="box-sizing: border-box; font-family: Calibri;">2.晴风村n><晴风村n style="box-sizing: border-box; font-family: 宋体;">拖动的机械负载工作不正常晴风村n>晴风村n>
<晴风村n style="box-sizing: border-box; font-family: Calibri; font-size: 16px;">设备虽然配套,但所拖动的晴风村n><晴风村n style="box-sizing: border-box;"><晴风村n style="box-sizing: border-box; font-weight: 700;"><晴风村n style="box-sizing: border-box; font-family: 宋体;">耐腐蚀泵晴风村n>晴风村n>晴风村n><晴风村n style="box-sizing: border-box; font-family: Calibri; font-size: 16px;">机械负载工作不正常,运行时负载时大时小,电动机过载而发热。晴风村n>
<晴风村n style="box-sizing: border-box; font-size: 16px;"><晴风村n style="box-sizing: border-box; font-family: Calibri;">3.晴风村n><晴风村n style="box-sizing: border-box; font-family: 宋体;">拖动的机械有故障晴风村n>晴风村n>
<晴风村n style="box-sizing: border-box; font-family: Calibri; font-size: 16px;">当被拖动的机械有故障,转动不灵活或被卡住,都将使电动机过载,造成电动机绕组过热。故检修电动机过热时,负载方面的因素不能忽视。晴风村n>
<晴风村n style="box-sizing: border-box; font-size: 16px;"><晴风村n style="box-sizing: border-box; font-family: 宋体;">二晴风村n><晴风村n style="box-sizing: border-box; font-family: Calibri;">.晴风村n><晴风村n style="box-sizing: border-box; font-family: 宋体;">电源的问题导致电动机过热晴风村n>晴风村n>
<晴风村n style="box-sizing: border-box; font-size: 16px;"><晴风村n style="box-sizing: border-box; font-family: Calibri;">1.晴风村n><晴风村n style="box-sizing: border-box; font-family: 宋体;">电源电压过高晴风村n>晴风村n>
<晴风村n style="box-sizing: border-box; font-family: Calibri; font-size: 16px;">当电源电压过高时,电动机反电动势、磁通及磁通密度均随之增大。由于铁损耗的大小与磁通密度平方成正比,则铁损耗增加,导致铁心过热。而磁通增加,又致使励磁电流分量急剧增加,造成定子绕组铜损增大,使绕组过热。因此,电源电压超过电动机的额定电压时,会使电动机过热。晴风村n>
<晴风村n style="box-sizing: border-box; font-size: 16px;"><晴风村n style="box-sizing: border-box; font-family: Calibri;">2.晴风村n><晴风村n style="box-sizing: border-box; font-family: 宋体;">三相电源不平衡晴风村n>晴风村n>
<晴风村n style="box-sizing: border-box; font-size: 16px;"><晴风村n style="box-sizing: border-box; font-family: 宋体;">当晴风村n><晴风村n style="box-sizing: border-box; font-weight: 700;"><晴风村n style="box-sizing: border-box; font-family: 宋体;">耐腐蚀化工泵晴风村n>晴风村n><晴风村n style="box-sizing: border-box; font-family: 宋体;">三相电源不平衡时,会使电动机的三相电流不平衡,引起绕组过热。由此可见,当电动机过热时,应首先考虑电源方面的原因(软启动、变频器、伺服驱动器亦可看作是电源)。确认电源方面无问题后,再去考虑其他方面因素。晴风村n>晴风村n>
<晴风村n style="box-sizing: border-box; font-size: 16px;"><晴风村n style="box-sizing: border-box; font-family: Calibri;">3.晴风村n><晴风村n style="box-sizing: border-box; font-family: 宋体;">电源电压过低晴风村n>晴风村n>
<晴风村n style="box-sizing: border-box; font-family: Calibri; font-size: 16px;">电源电压过低时,若电动机的电磁转矩保持不变,磁通将降低,转子电流相应增大,定子电流中负载电源分量随之增加,造成绕线的铜损耗增大,致使定、转子绕组过热。晴风村n>
<晴风村n style="box-sizing: border-box; font-size: 16px;"><晴风村n style="box-sizing: border-box; font-family: 宋体;">三晴风村n><晴风村n style="box-sizing: border-box; font-family: Calibri;">.晴风村n><晴风村n style="box-sizing: border-box; font-family: 宋体;">电机本身的问题导致电动机过热晴风村n>晴风村n>
<晴风村n style="box-sizing: border-box; font-size: 16px;"><晴风村n style="box-sizing: border-box; font-family: Calibri;">1.晴风村n><晴风村n style="box-sizing: border-box; font-family: 宋体;">电动机绕组断路晴风村n>晴风村n>
<晴风村n style="box-sizing: border-box; font-family: Calibri; font-size: 16px;">当电动机绕组中有一相绕组断路,或并联支路中有一条支路断路时,都将导致三相电流不平衡,使电动机过热。晴风村n>
<晴风村n style="box-sizing: border-box; font-size: 16px;"><晴风村n style="box-sizing: border-box; font-family: Calibri;">2.晴风村n><晴风村n style="box-sizing: border-box; font-family: 宋体;">电动机线圈接法错误晴风村n>晴风村n>
<晴风村n style="box-sizing: border-box; font-family: Calibri; font-size: 16px;">当一个线圈、线圈组或一相绕组接反时,都会导致三相电流严重不平衡,而使绕组过热。晴风村n>
<晴风村n style="box-sizing: border-box; font-size: 16px;"><晴风村n style="box-sizing: border-box; font-family: Calibri;">3.晴风村n><晴风村n style="box-sizing: border-box; font-family: 宋体;">电动机的机械故障晴风村n>晴风村n>
<晴风村n style="box-sizing: border-box; font-family: Calibri; font-size: 16px;">当电动机轴弯曲、装配不好、轴承有毛病等,均会使电动机电流增大,铜损耗及机械摩擦损耗增加,使电动机过热。晴风村n>