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斩波器用于感应予牵引励磁机时，有与一般直流机不同的特殊情况，即当励磁机产生的感应电势的频率与斩波器的开关频率接近整数倍时，励磁机的励磁电流将产生振荡，从而影响整个发电机组的工作性能。指出这一现象是由于在新波方式下，励磁机励磁电流交流分量在新波主管导通和截止时阻抗不同而造成的。并指出所谓的“振荡”只是励磁电流变化较慢时的外在表现而已。
Chopper used to induce pre-traction exciter, and the general DC machine is different from the special case, that is, when the exciter generated induction frequency and the chopper switching frequency close to integer multiples of exciter excitation current will be generated Oscillation, thus affecting the performance of the entire generating set. Pointed out that this phenomenon is due to the new wave mode, the exciter exciting current AC component in the new wave of the main lead on and off impedance caused by different. And pointed out that the so-called “oscillation” is only an external manifestation when the excitation current changes slowly.