In this paper, we propose a nonlinear adaptive speed and torque controller
of induction motors with unknown rotor resistance. All the system parameter
s except rotor resistance are assumed to be known, and only the stator curr
ents and rotor speed are assumed to be available. The desired speed and tor
que should be a smooth bounded function. A complete proof of the global sta
bility without singularity is given, and the output error will converge to
zero asymptotically, Finally, the simulation and experimental results will
be given to demonstrate the effectiveness of the proposed controller.