罗克韦尔产品22B-B024N104

22B-B024N104

22B-B024N104

用变频器驱动同步电机运行时，使用与上述方式不同的起动方式：带励起动。在变频器向同步电机定子输出电压之前，即启动前，先由励磁装置向同步电机的励磁绕组通以的励磁电流，然后变频器再向同步电机的电枢绕组输出适当的电压，起动电机。

同步电机与普通异步电机运行上主要的区别是同步电机在运行时，电枢电压矢量与转子磁极位置之间的夹角在某一范围之内，否则将导致系统失步。在电机起动之初，这二者的夹角是任意的，经过适当的整步过程将这一夹角控制到的范围之内，然后电机进入稳定的同步运行状态。因此，起动整步问题是变频器驱动同步电动机运行的关键问题。

第一步，励磁装置投励。励磁系统向同步电机的励磁绕组通以的励磁电流，在同步电机转子上建立的磁场。

第二步，变频器向同步电机的电枢绕组施加的直流电压，产生的定子电流。此时，在同步电机上产生的定子电流，并在定子上建立较强的磁场。转子在定、转子间电磁力的作用下开始转动，使转子磁极逐渐向定子磁极的异性端靠近。此时转子的转动方向可能与电机正常运行时的转向相同，也可能相反。

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