文中导出了计算直流电机换向器片间电压分布曲线的基本公式和试验验证；
Basic formulas for the calculation of bar to bar voltage distributing curve of DC motor commutator are derived and test-verified.
试验结果表明这种直流电动机的换向性能是较好的。
The test results show that commutation performance of the D. C. motor is better.
在不具备压力试验条件时，不允许拆掉换向阀的铅封和调整调压弹簧座。
In the lack of condition for the pressure test, it is not allowed to remove the lead sealing of the reversing valve to adjust the pressure regulating button.
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