作者提出直流牵引电动机的各项经济指标均应以单位容积功率为标准来评价。
The author puts forward here that the specific volumetric power should be regarded as the criterion of evaluation for all of the economic norms.
本文根据电动工业车辆的牵引特性，讨论了直流牵引电动机和牵引蓄电池的匹配问题。
Based on the tractive distinction of electric industrial trucks, this paper discusses the problem of matching the direct-current tractive motor with the tractive storage battery.
在无补偿直流牵引电动机中，通常采用主极极弧为圆弧的扩张气隙来改善换向器电位特性。
The opening air-gaps with circular main pole arc are usually used to improve the potential curve of commutator on non-compensable d. c. traction motors.
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