To facilitate the calculation of commutators, we list identities.

为了便于计算对易子，我们列出一些恒等式。

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Replace or recondition shafts, bearings, commutators and other components.

更换或翻新轴，轴承，整流子和其他组件。

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The exciter system of traditional dc exciter has some weaknesses, whose commutators and carbon brushes often need examining, repairing and maintaining timely.

对传统直流励磁机的励磁系统而言，其带有滑动接触部分的换向器和炭刷等薄弱环节，需要定时检修与维护。

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The exciter system of traditional dc exciter has some weaknesses, whose commutators and carbon brushes often need examining, repairing and maintaining timely.

对传统直流励磁机的励磁系统而言，其带有滑动接触部分的换向器和炭刷等薄弱环节，需要定时检修与维护。

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