西门子产品6ES7307-1KA02-0AA0

6ES7307-1KA02-0AA0

电机的转速范围较宽时，某些转速会使电机与设计产生共振，这是很难避免的。可以设置越程带，以跳过共振频率段。

由谐波产生的振荡转矩，频率取决于载波频率，幅值取决于脉冲宽度。若载频与其频的比值较低，振荡转矩的幅值可达15%。另外，变频器输出电压不对称（即使很小）也可能产生振荡转矩，然后传递给负载，需要预防。

电气绝缘

电压源变频器产生不同宽度和频率的固定振幅电压方波脉冲；其输出电压上升时间约50~400ns；为减小功率器件的开关损耗，应尽可能缩短上升时间。这种对电机端电压重复性的突增，势必降低其绝缘寿命；具有较快上升时间和较高电压的浪涌对绝缘损坏的危害更严重。另外经验表明，电缆长度增加使电机的冲击电压更大，上升时间也更长；如电机和变频器安装在一起，电压突变会减小。

较短上升时间的冲击导致电压在整个线圈中分布不均衡，线圈匝间出现高强度应力。上升时间越短，线圈第一匝承受的电压越大，容易使绝缘击穿。

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