[理工] 93台大 控制(C)
Q. Please determine the statement that is ture
1.A LEAD compensator is used to reduce the steady error
2.A LAG compensator is used to enlarge the system gain
3.A LAG compensator can increase the P.M. but LEAD can not.
4.A LEAD compensator can enlarge the BW ,but a LAG can not.
1.3沒什麼問題
2. phase lag comtroller 的波得圖 明明就會把福量往下拉
但是因為zero>pole 故當s-->0時 C(S)=K z/p>K 又好像可以增加系統增益
4. LEAD 會增加頻寬 LAG 會減少頻寬
但是如果比例增益K<1 那高頻幅量會被往下拉 頻寬一樣會變小
是我想太多嗎???
有沒有大大可以幫忙解答
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