一台并励直流电动机P N =75kW,U N =230V,I N =38A,n N =1750r/min。电枢回路总电阻R a =0.2Ω,励磁回路总电阻R f =383Ω。求满载运行时的电磁转矩为______。
A.
397.5N·m
B.
454.1N·m
C.
461.0N·m
D.
345.7N·m
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