西门子产品6ES7307-1EA01-0AA0

6ES7307-1EA01-0AA0

1、确定转矩转速范围，每个转速对应的额定转矩、峰值转矩和运行时间。

2、一般不考虑起动性能（轨道交通有的要求冗余，变频器故障时电机能运行）。

3、选择与转速变化弱相关的冷却方式。若转速范围较宽，不推荐IC411自扇风冷。

4、转速范围较宽，高转速时的功率不易保证时，降低额定电压（或提高额定频率）。

5、综合考虑轴承在低速/高速时的受力、润滑、振动、温度和寿命。

附加损耗及其影响

因变频器电源提供的是由矩形脉冲等效成的正弦波，故除有基波电压和电流产生的损耗外，还会产生附加损耗。其大小取决于变频器类型、参数及电机和滤波电路的设计。

附加损耗主要体现在电机导体（主要为转子导条）的集肤效应和漏磁通路径的涡流上，故对电机设计者来说，减小附加损耗的措施有：

A、转子绕组设计时减小集肤效应；

B、定子绕组设计时减小集肤效应；

C、转子槽开口；

D、避免转子铁心片间短路；

E、采用更薄的定转子冲片；

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