Sensorless IPMSM drive system using saliency back-EMF-based observer with MTPA control

摘要

A saliency back-electromotive force (EMF)-based torque observer using a new maximum torque per ampere (MTPA) control is proposed in this study to improve the speed estimating performance of a sensorless interior permanent magnet synchronous motor (IPMSM) drive system. First, the characteristics and mathematical model of the saliency back-EMF-based proportional-integral-derivative (PID) torque observer with the mechanical model-based phase-lock-loop (PLL) for the estimation of the rotor flux angle and speed of the IPMSM are discussed. Then, the implementation of the saliency back-EMF based MTPA control suitable using digital signal processor (DSP) is introduced. Finally, the feasibility of the proposed control schemes is verified through experimental results.