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Cu 1: Phng php nh gi trng thi ca t dnh: (t st, st, ct)
Khi m b, t trng thi cng. Khi m tng dn, t bt cng, chuyn sang trng thi do.
Khi m tip tc tng, t chuyn sang trng thi nho.
+ m gii hn do : Wd
+ m gii hn nho : Wnh
nh gi qua st B : B = (W - Wd)/ (Wnh - Wd)+ t ct pha ( ct) :
Rn ( B
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