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英文电机题,求指导!A 50hp,250v dc shunt motor has an armature resista

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英文电机题,求指导!
A 50hp,250v dc shunt motor has an armature resistance of 0.06ohm and a field winding resistance of 50ohm.The no-load speed at rated voltage is 1200rpm.Neglecting armature reaction,what will be the speed of the motor when its input current is 200A?
一台50马力(相当于37kW),250V的直流并励电动机,电枢电阻0.06欧姆,励磁绕组电阻50欧姆.在额定电压下,电机空载转速1200转/分钟.忽略电枢反应,电机达到额定转速时的输入电流是200A吗?
这道题如果要回答的话,电机额定输出时,计及电机的效率,电流应该在200A左右.