Dual-Hysteresis Torque Control of Multi-Induction Machines fed by a Nine-Switch Inverter

This paper presents a novel dual-hysteresis torque control method for multi induction motors fed by a nine-switch inverter. The proposed control method aims to control two separate induction motors with custom mechanical references. Stator current, mechanical speed, and torque are the control variables, and two motors are effectively controlled with the topology that contains a reduced number of switches. Instead of using two separate voltage-source inverters, a single nine-switch inverter guarantee a robust operation for applications where two mechanical loads are required to be controlled. Thus, the weight and size of the power stage are noticeably reduced which results in reliability improvement. The theoretical analyses and comprehensive design steps are presented and discussed. To verify the effectiveness of the proposed control method, the simulation results are presented.