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一台串励直流电动机，P N =22.4kW，I N =116A，U N =220V，n N =910r/min，R a =0.145Ω(包括串励绕组电阻)，起动时分两级进行，要求起动时尖峰电流，I st1 =2I N ，求起动电阻。
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