An H∞ position tracking controller for induction motors

This paper presents an H-infinity 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: non tracking errors while ensuring robustness with respect to load torque disturbances. The implementation of the H-infinity 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.