Sensorless control of Permanent Magnet Synchronous Motor based on rotating coordinate system considering dead-time

The Conventional Sliding Mode Observer (SMO) collects the rotor position angle information by identifying rotor position angle and needs to introduce phase-locked loop (PLL) to realize the reverse control. It has certain limitations including massive calculation, slow dynamic response and complex methods and not taking the effect from the inverter dead-time on the estimation model into consideration during the identifying process. To solve the problems, a new sensorless control method for the adaptive SMO based on rotating coordinate system considering dead-time is proposed. In this method response speed is improved by adopting rotating speed as control variable and phase error between actual motor and model motor is removed by introducing dead-time compensation in model motor. Then adaptive law of the estimated rotation speed is acquired through the Lyapunov non-liner design. It significantly simplifies the algorithm and can achieve reverse control at the same time. The effectiveness and feasibility have been proved by the results of the simulation and experiment.