西门子6ES7307-1EA01-0AA0

6ES7307-1EA01-0AA0

对于工频电磁制动电机，在额定电压、额定转速和额定频率下，电磁制动电机绕组不会被烧毁。但是，当电磁制动电机由于某种原因转速较低时，如负载过大导致转速下降，电磁制动电机启动过程未能达到额定转速时，电磁制动电机的电流会不同程度地超过额定电流。

电流增大是绕组发热的根本原因；同时，对于自带风扇的电磁制动电机，由于电磁制动电机转速的降低，风扇与转子同速旋转并不能有效地达到降低绕组温度的目的。大电流、高发热量和散热不良的双重因素导致电磁制动电机绕组严重发热甚至烧毁。

但是对于变频电磁制动电机来说，电磁制动电机本身是根据实际运行工况设计的，可以满足不同转速条件下的运行要求。在低速运行条件下，即低频运行时，电磁制动电机以恒转矩方式运行，而在高频运行时，电磁制动电机以恒功率方式运行。在任何运行状态下，电磁制动电机的运行电流始终低于额定电流，绕组不会因电流过大而出现温升问题。

此外，从散热的角度来看，大工作频率范围的电磁制动电机将采用独立风扇进行散热。独立风扇的运行不会受到电磁制动电机电源频率变化的影响，电磁制动电机的散热条件也不会自然恶化，即在变频电磁制动电机运行过程中，无论是电流还是散热条件，电磁制动电机绕组不会被加热；但是，对于变频电磁制动电机，电磁制动电机运行时风扇处于运行状态。电磁制动电机和风扇采用独立电源控制。禁止出现电磁制动电机运转但风扇不运转的问题。

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