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1 有一部直流分激電動機,測得其電源端電壓為98V,電樞電流為25A,轉速為1500rpm,電樞電阻為0.08Ω,若不考慮電樞反應及電刷接觸壓降,求此時電動機的電磁轉矩約為多少(N-m)?
A 31.7 N-m
B 26.7 N-m
C 15.3 N-m
D 2.74 N-m

E = V - IARA = 98 - 25 × 0.08 = 96V

Pm = E IA = Tm × ω

96×25 = Tm × 2π × 150060

Tm = 48/π = 15.28 N-m