结果表明换向理论分析是正确的。
The results showed that the theoretical analysis of commutation war correct.
本文根据直流电机换向理论，给出了一种分析直流电机换向火花的方法。
Based on the theory of commutation in DC machines, this paper describes a numerical analysis method for analysis of the commutation spark.
针对目前我国油田增产节能的迫切需要，棘轮换向节能式抽油机具有重要的理论意义和实用价值。
China's oil output for the current urgent need for energy conservation, the energy-saving pumping unit change direction by ratchet has important theoretical and practical value.
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