... stator, ta thu c phng trỡnh in ỏp ca mch rotor quan sỏt h ta c nh trờn rotor, cú trc thc i qua tõm trc rotor (hỡnh 1.5) v chỳ ý rng õy l h thng rotor lng súc (rotor ngn mch): d r r 0R i r r r (1.23) ... vector t thụng rotor (mụdul ca vector) isd, isq phn t d v q ca vector dũng stator mM mụmen quay ca ng c Lr, Lm in cm rotor, h cm gia stator v rotor pc s ụi cc ca ng c Tr hng s thi gian ca rotor p toỏn ... trng quay, t trng ny s cm ng lờn rotor mt sut in ng cm ng, rotor kớn mch nờn s xut hin dũng in chy rotor Dũng in ny v t trng quay tỏc ng vi s to mt momen lm quay rotor ng c xoay chiu ba pha dự...