Characteristics of speed sensorless vector control of parallel connected dual induction motor fed by a single inverter

This paper describes a speed sensorless vector control method of the torque for cost-effective parallel-connected dual induction motor fed by a single inverter. An adaptive rotor flux observer, which adds an adaptive scheme for rotor speed, is applied to each induction motor in order to eliminate a flux sensor and a speed sensor. In driving a dual induction motor of the same rating, we examine characteristics of this proposed method from the simulation and the experiment.