西门子6GK7343-1GX31-0XE0

6GK7343-1GX31-0XE0

普通电机和变频电机结构上的区别

01.绝缘等级要求更高

一般变频电机的绝缘等级为F级或更高，加强对地绝缘和线匝绝缘强度，特别要考虑绝缘耐冲击电压的能力。

02.变频电机的振动、噪声要求更高

变频电机要充分考虑电动机构件及整体的刚性，尽力提高其固有频率，以避开与各次力波产生共振现象。

03.变频电机冷却方式不同

变频电机一般采用强迫通风冷却，即主电机散热风扇采用独立的电机驱动。

04.保护措施要求不同

对容量超过160KW变频电动机应采用轴承绝缘措施。主要是易产生磁路不对称，也会产生轴电流，当其他高频分量所产生的电流结合一起作用时，轴电流将大为增加，从而导致轴承损坏，所以一般要采取绝缘措施。对恒功率变频电动机，当转速超过3000/min时，应采用耐高温的特殊润滑脂，以补偿轴承的温度升高。

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