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【简答题】
图1所示为单闭环调速系统的结构图。调节器为P调节器。 1、指出图1圆圈中标出相应电压的实际极性。 2、已知系统闭环速降△n cl =2rpm，在调速范围内，最大的理想空载转速n 0max ＝1500rpm，最小的理想空载转速n 0min ＝50rpm。求系统的转差率。 3、要求系统可直接启动，则图1所示的结构作何变动？ 4、欲使系统的静特性如图2所示，则图1在结构上作何变化。
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