-台 运 行于额 定 负 载 的三 相异步电动机 , 动 电源电 压 下降 10 % ,稳 定 运行后,电机的电磁转矩 ( ) (A) Tem =T n (B )I em =0 . 8 Tn (C)T em =0 . 9T n (D) Tem > Tn
A.
Tem =T n
B.
I em =0 . 8 Tn
C.
T em =0 . 9T n
D.
Tem > Tn
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