The Sensorless Control of IPMSM Based on the Extended State Sliding Mode Observer

This paper presents a novel method to estimate the rotor position based on the linear flux. Firstly, Interior Permanent Magnetic Synchronous Motor(IPMSM) mathematics model is established in the stationary frame based on linear flux, and rotor position is estimated by the extended state sliding mode observer. Secondly, the second order non-singular terminal sliding mode control is put forward to substitute for linear sliding mode in combination with the advantages of the high order sliding mode and non-singular terminal sliding mode due to the low converging speed of linear sliding mode and chatting. The stability of observer is proved by Lyapunov theory and the adaptive of sliding mode gain matrix is obtained. Thirdly, the effect of varieties of stator resistance and q-axis inductance on sliding mode observer estimated flux amplitude and phase is analyzed quantitatively. Rotor position and speed are obtained by PLL. Finally, the simulation and the experimental platform of sensorless IPMSM full-digital vector control system are designed. The experiment results prove the correctness and feasibility of this algorithm mentioned in the dissertation