Mechanical Parameter Identification of Permanent Magnet Synchronous Motor Based on High-Order Fast Terminal Sliding Mode Disturbance Observer

Aiming at the problem of the mechanical parameter identification for the interior permanent magnet synchronous machine (IPMSM), an identification method based on high-order fast terminal sliding mode disturbance observer is proposed. Combining a simple acceleration and deceleration algorithm and the disturbance information of the system in real time, the method can realize the friction coefficient and the moment of inertia of motor system on-line. After accurately identifying the mechanical parameters, the smoothed disturbance output value of the observer can be directly used to estimate the external load torque changes and shows the advantage of fast convergence and torque ripple suppression. Finally, the effectiveness of the mechanical parameter identification strategy based on high-order fast terminal sliding mode disturbance observer is verified by dSPACE experimental platform.