直流他励电动机数据如下:P N =21KW,U N =220V,I N =115A,n N =980r/min,R a =0.1Ω,系统折算到电动机轴上的总飞轮转矩GD 2 =64.7N·m 2 。 (1)求系统的机电时间常数τ m ; (2)若电枢电路串接1Ω的附加电阻,则τ m 变为多少? (3)若在上述基础上再将电动机励磁电流减小一半,τ m 又变为多少(设磁路没有饱和)?传动系统的过渡过程?
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