Direct Torque Control System of Dual Three-Phase PMSM with Load Torque Observer

This paper presents a direct torque control (DTC) strategy for dual three-phase permanent magnet synchronous motor (DTP-PMSM) based on space vector pulse width modulation (SVPWM), and develops a load torque observer based on the sliding mode observer (SMO). The sliding-mode-based load torque observer (SMLTO) is then integrated into the DTC system to facilitate real-time observation of the motor's load torque. The observed load torque is employed as input compensation for the torque loop of the control system, significantly enhancing the response speed and anti-interference capabilities. The effectiveness of the proposed control strategy is verified through simulations on a 2kW DTP-PMSM platform.