从理论上分析,如果能够控制电动机同步磁场的转速缓慢下降,使电动机在同一转速下特性跳转时,特性曲线维持在第一象限,理论上分析电机只经历有限的能耗制动阶段,不会过热。而变频器良好的内、外特性可以保证上述各项条件的满足。
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厦门仲鑫达自动化设备有限公司
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但是,采用该方法有一些必要的前提条件,首先,系统不能频繁进行启/停,否则会造成变频器直流电路故障。其次,提升机、电梯等下放重物的工况不适宜采用。再次,系统降速时间不能过短,即降速不能过快,否则工作点将进入第二象限发生再生制动过程,引起电机过热。 A5E00470986 Panel PC Spare Part Siemens
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