This paper describes the performance study of two induction motors of unequal ratings connected in parallel and controlled by a single inverter. The speed of the motors under unbalanced load conditions is maintained constant by employing PI controllers. Average and differential current flowing through the motors are considered to make the system stable under unbalanced load conditions. To perform sensorless control operation, natural observer is employed to estimate the stator currents, rotor fluxes and speed. In addition, the load torques of both the motors are estimated. The performance of the drive system is validated using MATLAB simulations. © International Science Press.