An H∞ position tracking controller for induction motors

Presents an H_∞ methodology design of a position tracking controller for an induction motor actuating a mechanical device. The proposed controller achieves convergence to zero of both position and flux norm tracking errors while ensuring robustness with respect to load torque disturbances. The implementation of the H_∞ control law requires stator currents and rotor speed measurements, while a reduced order flux observer is adopted to relax the need of flux measurement. Numerical simulation results are reported to show the effectiveness of the proposed controller in terms of both disturbance rejection and position tracking capability