Comparison of torque control bandwidth of HF injection, SMO and FPE Direct Torque control IPMSMS drives

This paper first extend the Fundamental PWM Excitation (FPE) sensorless control technique on Interior Permanent Magnet Synchronous Machine (IPMSM) and investigates the torque control bandwidth of three sensorless control schemes for Direct Torque and Flux Control (DTFC) for IPMSMs, including High Frequency (HF) Injection, Adaptive Sliding Mode Observer (SMO) and FPE. Through the frequency response analysis of these three sensorless control schemes, FPE and SMO sensorless technique have better dynamic performance with high torque control bandwidth which is close to the sensor-based control. While HF injection method has the lowest torque bandwidth because this scheme employs band-pass and low-pass filter and Phase Locked Loop (PLL) in the estimation which adds to the delays. The simulation results are shown to verify the effectiveness of the proposed FPE sensorless control and the dynamic characteristic of different sensorless schemes for IPMSM drives.