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【简答题】
一台串励直流电动机，U N =220V，I N =78.5A，电枢和励磁绕组的总电阻R a +R f =0.26Ω，不计磁路饱和的影响和空载转矩。当驱动某负载运行时，电枢电流I a =31.4A，转速n=1552r/min。现使负载转矩增加为原负载转矩的4倍，求此负载时电动机的电枢电流和转速，该电动机是否过载?
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