2-10 BASIC QUE ST(ONS )心 ERE DDE5Ww∈ LOCUS STAR-? K→0,以E,THL=N/D c0=生+k 0+KN=0 LOCUs STARTS AT As K →D Roots oF D ARE THE POLES oFTHE PLANT AAA0C0 PEnS丹T0R 2)WHERE DOES THE LOCUS ENO ALREADY SH6∈ D THAT FoR S。 To BE ON mHEL0cυs,W∈ MUST HAVt k 4. As K POLES MUST SOLVE n= Nc Np =O Dc Op SEVERAL POSS\ BILITIES POLES LOCATED AT VALVES oF s FoR WHICH N ZE ROS Df PLANT/ CoMPENSAToR B)Loop (L(s))HAS MORE POLES THAN ZEROS AS 5s→,|4(s)l→0 WE MUST ALSO ENSURE THAT THE PHASE CON DITION 工ss4TsFE0sL