excitation system with direct-current exciter
...ing current commutator type exciter 交流换向器式励磁机 excitation system with direct-current exciter 直流励磁机励磁系统 excitation system with alternate-current exciter 交流励磁机励磁系统 ..
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excitation system with direct-current exciter
采用直流励磁器的励磁系统
以上为机器翻译结果，长、整句建议使用 人工翻译 。