罗克韦尔产品22B-B024H204

22B-B024H204

22B-B024H204

为了的说明同步电机的运行特点，先对同步电机的工频起动投励过程进行简要的介绍。

在电网电压直接驱动同步电机工频运行时，同步电动机的起动投励是一个比较复杂的过程。当同步电机电枢绕组高压合闸时，通过高压断路器的辅助触点告知同步电机的励磁装置准备投励。此时，励磁装置自动在同步电机的励磁绕组上接入一个灭磁电阻，以防止励磁绕组上感应出高压，同时在起动时提供一部分起动转矩。同步电机电枢绕组上电后，在起动绕组和连有灭磁电阻的励磁绕组的共同作用下，电机开始加速。当速度到达95%的同步转速时，励磁装置根据励磁绕组上的感应电压选择合适的时机投入励磁，电机被牵入同步速运行。如果同步电机的凸极效应较强、起动负载较低，则在励磁装置找到合适的投励时机之前，同步电机已经进入同步运行状态。在这种情况下，励磁装置将按照延时投励的准则进行投励，即高压合闸后15秒强行投励。

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