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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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