| Abstract |
Controlling the stator flux module of a three-phase induction motor leads to bad behaviour, eg. near speed-reversal and in position control due to the possibility of variable components. This paper shows that by making the component q of the stator flux equal to zero and controlling the component d (in a synchronous-reference frame), improved results are obtained with excellent torque controllability, which makes the position-control and tracking-control very easy, using state-feedback techniques. In this new strategy of flux control, the transfer function is independent of speed and machine rotor parameters, which makes its implementation very easy and it is not the case in conventional straregies, namely the vector control method. Finally, to overcome the drawback of the degradation of the system operation in the presence of a load torque, a state feedback structure for position control is developed, with an integral action at the input, in order to cancel out a possible steady state error. |
