Abstract: Aiming at the problems of chattering and poor observation accuracy of traditional full order sliding

mode observer (FSMO), a sensorless control strategy of interior permanent magnet synchronous motor (IPMSM)

based on improved full order sliding mode observer was proposed. In this strategy, the quasi-sign function was used

instead of the nonlinear sign function as the switching function, and the stability of the system was analyzed by

using the idea of equivalent control and Lyapunov function. On this basis, to avoid the influence of the motor speed

on the estimation accuracy of the rotor position, an adaptive sliding mode gain related to the motor speed was

designed. Finally, the correctness and effectiveness of the proposed sensorless control strategy were verified on the

2 kW IPMSM vector control experimental platform.

    Key words: interior permanent magnet synchronous motor(IPMSM) ; full order sliding mode observer(FSMO) ;

chattering suppression; position sensorless control