Torque Control Characteristics of Simple Controller-Based Direct Torque Control for PMSM Drive System

Direct torque control (DTC) is a sensorless control method for permanent magnet synchronous motor drives. Reference flux vector calculation (RFVC)-DTC uses a proportional-integral controller for torque control and can be applied with a pulse-width-modulation voltage-fed inverter. This study proposes a speed decoupling method for RFVC-DTC. A simulation and an experiment confirm that the proposed method improves control characteristics such as the torque step response.