3E034410
3E034410
3E034410
19、电机过50HZ时应注意什么问题?
1)机械和装置在该转速下运转要充分可能(机械强度、噪声、振动等)
2)电机进入恒功率输出范围，其输出转矩要能够维持工作(风机、泵等轴输出功率与速度 的立方成比例增加，所以转速少许升高时要注意)
3)产生轴承寿命问题，要充分加以考虑。
4)对于中容量以上的电机特别是2级电机，在50HZ以上运转时要特别注意。
20、要想提高输送带的速度，以80HZ运转，变频器的容量该怎样选择?
设基准速度为50HZ，50HZ以上为恒功率输出特性。像输送带这样的恒转矩负载增速时，容量需要增大为80/50=1。6倍。电机容量也像变频器一样增大。
21、 想使两台2。2KW、4级电机顺序起动，用一台变频器传动时容量应怎样考虑?
如果两台2。2KW的电机同时起动、同时停止，设2。2KW的额定电流为5A，那么以两倍的10A计算用5。5KW(额定电流11A)的变频器就足够了。顺序起动时，第2台电机起动所需要的电流，相当于全压起动，以额定值的6倍计算，则需要能承受的过电流为(5+6X5)A=35A的变频器，即以15KW以上，因此，用一台变频器进行顺序起动在价格、大小方面没有优势，以采用两台单独的变频器为好。
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