Comparative study of direct torque control and field-oriented control for six-phase permanent magnet synchronous motor

Tóm tắt

This study presents a MATLAB-based comparative simulation of a six-phase Permanent Magnet Synchronous Motor (PMSM) under field-oriented control (FOC) and direct torque control (DTC). The results show that FOC maintains a more stable speed response than DTC, exhibiting smaller errors and reduced ripple, particularly during rapid acceleration steps. Mean torque and RMS fluctuation analyses indicate that FOC delivers smoother torque with significantly lower short-term oscillations, whereas DTC provides a faster torque transient at the expense of larger torque fluctuations, especially at low and medium speeds. Phase-current evaluation further confirms improved current regulation with FOC, with RMS and peak-to-peak values lower or comparable to those of DTC at high speed, reflecting reduced oscillatory behavior. These trends remain consistent across 0–3000 rpm, highlighting the trade-off between the faster torque response of DTC and the smoother torque and current performance of FOC in multiphase PMSM drives.