Online Tuning Method of Stator and Rotor resistances in both of Motoring and Regenerating Operations for Vector Controlled Induction Machines

The vector control of the induction motor is widely used. This method needs accurate motor parameter but the stator and rotor resistance vary due to motor temperature variation. If value of resistance in the controller can be set up accurately at first, there must be difference between reference and real value of torque because of drift of resistance. It is necessary to adapt resistance value. The indirect field oriented control of an induction motor requires value of rotor resistance only, but the direct field oriented control method with rotor flux observer requires value of not only rotor resistance but also stator resistance in the controller. And, consequently it is necessary to adapt both of stator resistance and rotor resistance. Parameter adaptation scheme has been proposed for the direct field oriented control method with rotor flux observer so far, but this method can not use on condition that the motor is in regenerating operation. In this paper, a new stator and rotor resistance adaptation scheme is proposed, which can be applyed on condition that the motor is in regenerating operation. The propriety of the proposed adaptation scheme is proved by simulation.